An air conditioner and an air conditioner control method

Abstract

The application discloses an air conditioner and an air conditioner control method. After the air conditioner enters a refrigeration / dehumidification mode and runs for a period of time, the shell temperature of the compressor is acquired, and whether the shell temperature of the compressor meets a preset temperature condition is judged. When the shell temperature of the compressor meets the preset temperature condition, the outdoor environment temperature, the indoor environment temperature and the set target temperature are acquired, and whether the temperature difference between the outdoor environment temperature and the indoor environment temperature and the set target temperature meets a preset control condition is judged. When the outdoor environment temperature and the temperature difference meet the preset control condition, the running frequency of the compressor, the opening degree of the electronic expansion valve and the rotating speed of the outdoor fan are adjusted according to the control mode corresponding to the met control condition. The application can more accurately adjust the running frequency of the compressor, effectively protect the compressor and avoid demagnetization failure of the compressor, improve the reliability of the air conditioner system operation, and achieve the purpose of energy saving and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of air conditioner control technology, and more particularly to an air conditioner and an air conditioner control method. Background Technology

[0002] Currently, air conditioners are widely used in people's work and daily life. By operating in cooling / heating mode, air conditioners can regulate the indoor temperature, thereby improving the comfort of the user's environment. However, in actual operation, if the air conditioner directly controls the compressor to operate at a fixed frequency based on the indoor temperature, or directly operates in a fixed mode based on the temperature difference between the user's set temperature and the indoor temperature, it will result in unnecessary waste of electricity.

[0003] Although some existing air conditioner control schemes can detect the temperature of the compressor's exhaust pipe and the indoor ambient temperature, and adjust the compressor's operating frequency accordingly to prevent the compressor from operating at a fixed frequency, in practice, the exhaust pipe temperature and the actual exhaust temperature during operation are not consistent. This can easily lead to inaccurate adjustment and frequent switching of the compressor's operating frequency between high and low frequencies, which may cause the compressor to demagnetize and fail, affecting the reliability of the air conditioner system. Summary of the Invention

[0004] The purpose of this invention is to provide an air conditioner and an air conditioner control method that can use the compressor casing temperature to replace the exhaust pipe temperature, making the exhaust temperature more accurate, thereby more accurately adjusting the compressor's operating frequency, effectively protecting the compressor and preventing compressor demagnetization failure, improving the reliability of the air conditioner system, and combining effective control logic to make the air conditioner operate in a better energy-efficient state, thereby achieving a more energy-saving and efficient purpose.

[0005] To achieve the above objectives, embodiments of the present invention provide an air conditioner, the air conditioner comprising:

[0006] A refrigerant circuit in which the refrigerant circulates sequentially through a compressor, a condenser, an electronic expansion valve, and an evaporator in a refrigeration cycle, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger.

[0007] An outdoor fan is used to supply air to the outdoor heat exchanger.

[0008] The first temperature sensor is used to detect the outdoor ambient temperature;

[0009] The second temperature sensor is used to detect the indoor ambient temperature;

[0010] A third temperature sensor is installed on the housing of the compressor to detect the housing temperature of the compressor.

[0011] Controller, used for:

[0012] After the air conditioner enters the cooling / dehumidification mode and runs for a period of time, the casing temperature of the compressor is obtained, and it is determined whether the casing temperature of the compressor meets the preset temperature conditions.

[0013] When the compressor casing temperature meets the preset temperature conditions, the outdoor ambient temperature, indoor ambient temperature and set target temperature are acquired, and it is determined whether the temperature difference between the outdoor ambient temperature and the indoor ambient temperature and the set target temperature meets the preset control conditions.

[0014] When the outdoor ambient temperature and the temperature difference meet the preset control conditions, the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan are adjusted according to the control mode corresponding to the met control conditions.

[0015] Furthermore, the controller determines whether the temperature difference between the outdoor ambient temperature and the indoor ambient temperature and the set target temperature meets preset control conditions, specifically including:

[0016] The outdoor ambient temperature is compared with preset first outdoor ambient temperature threshold, second outdoor ambient temperature threshold, third outdoor ambient temperature threshold, fourth outdoor ambient temperature threshold and fifth outdoor ambient temperature threshold;

[0017] The temperature difference between the indoor ambient temperature and the set target temperature is compared with preset first temperature difference threshold, second temperature difference threshold, third temperature difference threshold and fourth temperature difference threshold;

[0018] Then, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, specifically including:

[0019] When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset lower speed limit according to the determined control mode.

[0020] Furthermore, after a first preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the third temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0021] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0022] When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening degree value, and the speed of the outdoor fan is adjusted to a preset first speed value.

[0023] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset first compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the first compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

[0024] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0025] When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a first preset number of steps, the speed of the outdoor fan is adjusted to a preset first speed value, and the opening of the electronic expansion valve is increased based on a preset second compressor temperature range until the temperature difference is below the fourth temperature difference threshold. Then, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0026] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0027] When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset lower speed limit according to the determined control mode.

[0028] Furthermore, after a first preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the third temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0029] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0030] When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset first speed value.

[0031] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

[0032] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0033] When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a second preset number of steps, the speed of the outdoor fan is adjusted to a preset first speed value, and the opening of the electronic expansion valve is increased based on a preset third compressor temperature range until the temperature difference is below the fourth temperature difference threshold. Then, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0034] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0035] When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset first speed value according to the determined control mode.

[0036] Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and the control mode is redefined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0037] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0038] When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset first speed value.

[0039] Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

[0040] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0041] When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0042] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset fourth compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the fourth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0043] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0044] When the outdoor ambient temperature is between the second and third outdoor ambient temperature thresholds, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a third preset number of steps, the speed of the outdoor fan is adjusted to a preset second speed value, and the opening of the electronic expansion valve is increased based on a preset fifth compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0045] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0046] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0047] Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0048] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0049] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset second speed value according to the determined control mode.

[0050] Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0051] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0052] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset upper speed limit according to the determined control mode.

[0053] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the opening of the electronic expansion valve is adjusted to the sum of a preset lower limit and a fourth preset number of steps. The operating frequency of the compressor is increased based on a preset fifth compressor temperature range until the compressor's operating frequency reaches a preset upper limit. Then, the opening of the electronic expansion valve is increased based on the fifth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed.

[0054] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0055] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a fifth preset step value, the speed of the outdoor fan is adjusted to a preset upper speed value, and the opening of the electronic expansion valve is increased based on a preset sixth compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0056] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0057] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0058] Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0059] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0060] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0061] Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset fourth compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the fourth compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0062] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0063] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset upper speed limit according to the determined control mode.

[0064] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the opening of the electronic expansion valve is adjusted to the sum of a preset lower limit and a sixth preset number of steps. The operating frequency of the compressor is increased based on a preset fifth compressor temperature range until the compressor's operating frequency reaches a preset upper limit. Then, the opening of the electronic expansion valve is increased based on the fifth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed.

[0065] Furthermore, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes:

[0066] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a seventh preset step value, the speed of the outdoor fan is adjusted to a preset second speed value, and the opening of the electronic expansion valve is increased based on a preset seventh compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0067] To achieve the above objectives, embodiments of the present invention also provide an air conditioner control method, applicable to any of the air conditioners described above, wherein the method is executed by the controller, and the method includes:

[0068] After the air conditioner enters the cooling / dehumidification mode and runs for a period of time, the casing temperature of the compressor is obtained, and it is determined whether the casing temperature of the compressor meets the preset temperature conditions.

[0069] When the compressor casing temperature meets the preset temperature conditions, the outdoor ambient temperature, indoor ambient temperature and set target temperature are acquired, and it is determined whether the temperature difference between the outdoor ambient temperature and the indoor ambient temperature and the set target temperature meets the preset control conditions.

[0070] When the outdoor ambient temperature and the temperature difference meet the preset control conditions, the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan are adjusted according to the control mode corresponding to the met control conditions.

[0071] Compared with the prior art, the present invention provides an air conditioner and an air conditioner control method. The air conditioner includes a refrigerant circuit in which the refrigerant circulates sequentially through a compressor, a condenser, an electronic expansion valve, and an evaporator in a refrigeration cycle. One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger. It also includes an outdoor fan for supplying air to the outdoor heat exchanger; a first temperature sensor for detecting the outdoor ambient temperature; a second temperature sensor for detecting the indoor ambient temperature; a third temperature sensor disposed on the compressor housing for detecting the compressor housing temperature; and a controller. This invention is used to: after the air conditioner enters cooling / dehumidification mode and runs for a period of time, acquire the compressor casing temperature and determine whether the compressor casing temperature meets the preset temperature conditions; when the compressor casing temperature meets the preset temperature conditions, acquire the outdoor ambient temperature, indoor ambient temperature, and set target temperature, and determine whether the temperature difference between the outdoor ambient temperature, indoor ambient temperature, and set target temperature meets the preset control conditions; when the outdoor ambient temperature and temperature difference meet the preset control conditions, adjust the compressor operating frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. This embodiment of the invention can use the compressor casing temperature instead of the exhaust pipe temperature, making the exhaust temperature more accurate, thereby more accurately adjusting the compressor operating frequency, effectively protecting the compressor and preventing compressor demagnetization failure, improving the reliability of the air conditioner system, and combining effective control logic to make the air conditioner operate in a more energy-efficient state, thus achieving a more energy-saving and efficient purpose. Attached Figure Description

[0072] Figure 1 This is a three-dimensional structural diagram of the appearance of an air conditioner provided in an embodiment of the present invention;

[0073] Figure 2 This is a schematic diagram of the structure of an outdoor unit of an air conditioner provided in an embodiment of the present invention;

[0074] Figure 3 This is a schematic diagram of the structure of an indoor unit of an air conditioner provided in an embodiment of the present invention;

[0075] Figure 4 This is a schematic diagram of the structure of an air conditioner compressor provided in an embodiment of the present invention;

[0076] Figure 5 This is a flowchart illustrating the operation of an air conditioner controller according to an embodiment of the present invention;

[0077] Figure 6 This is another flowchart of the operation of an air conditioner controller provided in an embodiment of the present invention;

[0078] Figure 7 This is another flowchart of the operation of an air conditioner controller provided in an embodiment of the present invention;

[0079] Figure 8 This is another flowchart of the operation of an air conditioner controller provided in an embodiment of the present invention;

[0080] Figure 9 This is another flowchart of the operation of an air conditioner controller provided in an embodiment of the present invention;

[0081] Figure 10 This is another flowchart of the operation of an air conditioner controller provided in an embodiment of the present invention;

[0082] Figure 11 This is a flowchart illustrating an air conditioner control method provided in an embodiment of the present invention. Detailed Implementation

[0083] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0084] See Figure 1The diagram shown is a three-dimensional structural schematic of an air conditioner according to an embodiment of the present invention. The air conditioner includes an indoor unit 100 and an outdoor unit 200. The outdoor unit 200 is connected to the indoor unit 100 through a connecting pipe. The indoor unit 100 is generally installed indoors, and the outdoor unit 200 is generally installed outdoors.

[0085] It's important to note that air conditioners execute a refrigeration cycle using a compressor, condenser, expansion valve, and evaporator. This cycle involves a series of processes: compression, condensation, expansion, and evaporation, supplying refrigerant to conditioned and heat-exchanged air. The compressor compresses the refrigerant gas at high temperature and pressure and discharges the compressed gas. The discharged refrigerant gas flows into the condenser, where it condenses the compressed refrigerant into a liquid phase, releasing heat to the surrounding environment. The expansion valve expands the high-temperature, high-pressure liquid refrigerant in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves the cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the refrigeration cycle, the air conditioner regulates the temperature of the indoor space.

[0086] The outdoor unit 200 of the air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit 100 of the air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in the indoor unit or the outdoor unit.

[0087] The indoor and outdoor heat exchangers are used as condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in heating mode. When the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in cooling mode.

[0088] In an embodiment of the present invention, the air conditioner includes a refrigerant circuit in which the refrigerant circulates sequentially through a compressor, a condenser, an electronic expansion valve, and an evaporator in a refrigeration cycle, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; and an outdoor fan for supplying air to the outdoor heat exchanger.

[0089] Combination Figure 2 The diagram shown is a structural schematic of an outdoor unit of an air conditioner according to an embodiment of the present invention. In this embodiment, the air conditioner further includes a first temperature sensor, which is used to detect the outdoor ambient temperature in real time. Figure 2 As shown, the first temperature sensor is generally located at the return air of the outdoor unit. Preferably, the first temperature sensor can be located at a distance of about 1 cm from the fins of the exhaust condenser.

[0090] Combination Figure 3 The diagram shown is a structural schematic of an indoor unit of an air conditioner according to an embodiment of the present invention. In this embodiment, the air conditioner further includes a second temperature sensor, which is used to detect the indoor ambient temperature in real time. Figure 3 As shown, the second temperature sensor is generally located at the return air of the indoor unit. Preferably, the second temperature sensor can be located about 1 cm away from the fins of the exhaust evaporator.

[0091] Combination Figure 4 The diagram shown is a structural schematic of an air conditioner compressor according to an embodiment of the present invention. In this embodiment, the air conditioner further includes a third temperature sensor, which is disposed on the compressor housing. The third temperature sensor is used to detect the compressor housing temperature in real time. Figure 4 As shown, the third temperature sensor can be positioned at the top of the compressor housing to detect the temperature at the top of the compressor housing.

[0092] In this embodiment of the invention, the air conditioner further includes a controller, which controls the operation of various components in the air conditioner to enable the various components to function. The air conditioner also includes a remote control, which has the function of communicating with the controller, for example, using infrared or other communication methods. The remote control allows the user to input various control signals to the air conditioner, enabling interaction between the user and the air conditioner.

[0093] In this embodiment of the invention, the controller is communicatively connected to the first temperature sensor, the second temperature sensor, and the third temperature sensor, respectively. The controller is used to control the air conditioner according to the outdoor ambient temperature detected in real time by the first temperature sensor, the indoor ambient temperature detected in real time by the second temperature sensor, and the compressor casing temperature detected in real time by the third temperature sensor, using the technical solution provided in this embodiment of the invention, so as to solve the technical problem to be solved by this embodiment of the invention and achieve the technical effect that this embodiment of the invention can achieve.

[0094] As one optional embodiment, the controller is used for:

[0095] After the air conditioner enters the cooling / dehumidification mode and runs for a period of time, the casing temperature of the compressor is obtained, and it is determined whether the casing temperature of the compressor meets the preset temperature conditions.

[0096] When the compressor casing temperature meets the preset temperature conditions, the outdoor ambient temperature, indoor ambient temperature and set target temperature are acquired, and it is determined whether the temperature difference between the outdoor ambient temperature and the indoor ambient temperature and the set target temperature meets the preset control conditions.

[0097] When the outdoor ambient temperature and the temperature difference meet the preset control conditions, the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan are adjusted according to the control mode corresponding to the met control conditions.

[0098] Combination Figure 5 The diagram shown is a flowchart of the operation of an air conditioner controller according to an embodiment of the present invention. In a specific implementation, the controller operates as follows: When the air conditioner is turned on, it is remotely controlled to enter the cooling / dehumidification mode (…). Figure 5 As shown in step S11), and after running for a period of time (e.g., 3 minutes), the compressor casing temperature Tp is obtained in real time by a third temperature sensor. Figure 5 Step S12 is shown, and it is determined whether the currently detected compressor casing temperature Tp meets the preset temperature condition. Figure 5 Step S13 (shown); When it is determined that the currently detected compressor casing temperature Tp meets the preset temperature conditions, the outdoor ambient temperature Tw is detected and obtained in real time through the first temperature sensor, the indoor ambient temperature Tn is detected and obtained in real time through the second temperature sensor, the set target temperature Ts is obtained, and the temperature difference ΔT = Tn - Ts is calculated based on the currently detected indoor ambient temperature Tn and the obtained set target temperature Ts. Figure 5 Step S14 (as shown); further determine whether the temperature difference ΔT between the currently detected outdoor ambient temperature Tw, the calculated indoor ambient temperature Tn, and the set target temperature Ts meets the preset control conditions ( Figure 5 Step S15 (as shown); when it is determined that the temperature difference ΔT between the currently detected outdoor ambient temperature Tw, the calculated indoor ambient temperature Tn, and the set target temperature Ts meets the preset control conditions, the compressor's operating frequency, the opening of the electronic expansion valve, and the outdoor fan speed are adjusted accordingly based on the control mode corresponding to the determined control conditions. Figure 5 Step S16 is shown.

[0099] Among them, the outdoor ambient temperature Tw and the temperature difference ΔT correspond to different control conditions under different temperature values. Different control modes are set for different control conditions. That is, one control condition corresponds to one control mode. In each control mode, the operating frequency of the compressor, the opening degree of the electronic expansion valve and the speed of the outdoor fan are adjusted accordingly.

[0100] In this embodiment of the invention, when the controller determines whether the currently detected compressor casing temperature Tp meets the preset temperature conditions, it can compare the currently detected compressor casing temperature Tp with a preset compressor temperature threshold. If the currently detected compressor casing temperature Tp is below the preset compressor temperature threshold, it is determined that the currently detected compressor casing temperature Tp meets the preset temperature conditions, and step S14 can continue to be executed. If the currently detected compressor casing temperature Tp is above the preset compressor temperature threshold, it is determined that the currently detected compressor casing temperature Tp... If the preset temperature conditions are not met, step S14 cannot be executed. However, the compressor can be stopped, the outdoor fan can be stopped after a delay, the indoor fan can be kept at its initial speed, and after a period of time, the compressor casing temperature Tp can be detected and obtained again in real time through the third temperature sensor (i.e., return to step S12). The current detected compressor casing temperature Tp is then re-evaluated to see if it meets the preset temperature conditions (i.e., step S13 is executed). This process continues until the current detected compressor casing temperature Tp is determined to meet the preset temperature conditions. At this point, step S14 can be executed.

[0101] For example, assuming the preset compressor temperature threshold is 110℃, when Tp≤110℃, it is determined that the currently detected compressor casing temperature Tp meets the preset temperature condition, and then step S14 continues to be executed; when Tp>110℃, it is determined that the currently detected compressor casing temperature Tp does not meet the preset temperature condition, then the compressor is controlled to stop, the outdoor fan is controlled to stop after a 1-minute delay (a further 1-minute delay after the compressor stops), and the indoor fan is controlled to maintain its initial speed. Then, the compressor casing temperature Tp can be detected every 5 minutes to determine whether Tp≤110℃ is met. If Tp>110℃ is still met, the cycle continues until it is determined that Tw≤50℃ is met, then the protection is exited, and step S14 continues to be executed.

[0102] It should be noted that the target temperature Ts can be set by the user via remote control, or it can be set in advance and stored in the air conditioner's memory so that the pre-stored target temperature Ts can be retrieved directly from the memory when needed later (generally when the user is using the automatic mode).

[0103] An air conditioner provided in this invention includes a refrigerant circuit in which refrigerant circulates sequentially through a compressor, a condenser, an electronic expansion valve, and an evaporator in a refrigeration cycle. One of the condenser and evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger. The air conditioner also includes an outdoor fan for supplying air to the outdoor heat exchanger; a first temperature sensor for detecting the outdoor ambient temperature; a second temperature sensor for detecting the indoor ambient temperature; and a third temperature sensor, disposed on the compressor housing, for detecting the compressor housing temperature. Furthermore, the air conditioner includes a controller for: acquiring the compressor housing temperature after the air conditioner has entered cooling / dehumidification mode and operated for a period of time, and determining whether the compressor housing temperature meets a preset temperature condition; when the compressor housing temperature meets the preset temperature condition, acquiring the outdoor ambient temperature, the indoor ambient temperature, and a set target temperature, and determining whether the temperature difference between the outdoor ambient temperature, the indoor ambient temperature, and the set target temperature meets a preset control condition; and when the outdoor ambient temperature and the temperature difference meet the preset control condition, adjusting the compressor operating frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control condition. By installing a temperature sensor on the compressor housing, the existing temperature sensor on the exhaust pipe can be moved to the compressor body. The temperature of the compressor housing is used instead of the exhaust pipe temperature, making the detected exhaust temperature more accurate. This allows for more precise adjustment of the compressor's operating frequency, effectively protecting the compressor and preventing demagnetization failure and burnout. It also provides more accurate protection for the entire unit's operation, improving the reliability of the air conditioning system. Furthermore, combined with effective control logic, the air conditioner can always operate in an optimal energy-efficient state, thus achieving greater energy savings and efficiency.

[0104] As one optional embodiment, the controller determines whether the temperature difference between the outdoor ambient temperature and the indoor ambient temperature and the set target temperature meets preset control conditions, specifically including:

[0105] The outdoor ambient temperature is compared with preset first outdoor ambient temperature threshold, second outdoor ambient temperature threshold, third outdoor ambient temperature threshold, fourth outdoor ambient temperature threshold and fifth outdoor ambient temperature threshold;

[0106] The temperature difference between the indoor ambient temperature and the set target temperature is compared with preset first temperature difference threshold, second temperature difference threshold, third temperature difference threshold and fourth temperature difference threshold;

[0107] Then, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, specifically including:

[0108] When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset lower speed limit according to the determined control mode.

[0109] Furthermore, after a first preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the third temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0110] Combination Figure 6 The diagram shown is another operational flowchart of an air conditioner controller provided in an embodiment of the present invention. Based on the above embodiment, in specific implementation of this embodiment, the controller executes... Figure 5 In step S15, the outdoor ambient temperature Tw can be compared with the preset first outdoor ambient temperature threshold Tw1, second outdoor ambient temperature threshold Tw2, third outdoor ambient temperature threshold Tw3, fourth outdoor ambient temperature threshold Tw4, and fifth outdoor ambient temperature threshold Tw5, respectively. Figure 6 Step S151 shown, and comparing the temperature difference ΔT between the indoor ambient temperature Tn and the set target temperature Ts with the preset first temperature difference threshold T1, second temperature difference threshold T2, third temperature difference threshold T3 and fourth temperature difference threshold T4. Figure 6 Step S152) is shown to determine whether the outdoor ambient temperature Tw, the calculated indoor ambient temperature Tn, and the temperature difference ΔT between the set target temperature Ts meet the preset control conditions; accordingly, the controller executes... Figure 5In step S16, when it is determined that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is below the first outdoor ambient temperature threshold Tw1, and the temperature difference ΔT is between the second temperature difference threshold T2 and the third temperature difference threshold T3, the control mode corresponding to the control conditions currently met by the outdoor ambient temperature Tw and the temperature difference ΔT is further determined. Figure 6 As shown in step S1611), the compressor's operating frequency is adjusted to a preset lower frequency limit according to the determined control mode, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the outdoor fan speed is adjusted to a preset lower speed limit. Figure 6 Step S1612 (as shown); After running for the first preset time, re-determine whether the temperature difference ΔT is still between the second temperature difference threshold T2 and the third temperature difference threshold T3. Figure 6 If the step S1613 shown is true, then the current control mode remains unchanged. Figure 6 As shown in step S1614), and after running for the second preset time period, control the air conditioner to enter the oil return mode. Figure 6 (See step S1615); If not, for example, if the temperature difference ΔT is above the third temperature difference threshold T3, then exit the current control mode. Figure 6 As shown in step S1616), the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT, in order to readjust the compressor's operating frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan (equivalent to returning to the previous step). Figure 5 or Figure 6 Step S14 is shown.

[0111] Among them, the first outdoor ambient temperature threshold Tw1, the second outdoor ambient temperature threshold Tw2, the third outdoor ambient temperature threshold Tw3, the fourth outdoor ambient temperature threshold Tw4, and the fifth outdoor ambient temperature threshold Tw5 satisfy the following relationship: the first outdoor ambient temperature threshold Tw1 < the second outdoor ambient temperature threshold Tw2 < the third outdoor ambient temperature threshold Tw3 < the fourth outdoor ambient temperature threshold Tw4 < the fifth outdoor ambient temperature threshold Tw5; the first temperature difference threshold T1, the second temperature difference threshold T2, the third temperature difference threshold T3, and the fourth temperature difference threshold T4 satisfy the following relationship: the first temperature difference threshold T1 < the second temperature difference threshold T2 < the third temperature difference threshold T3 < the fourth temperature difference threshold T4.

[0112] It should be noted that in cooling / dehumidifying mode, the lowest frequency (i.e., lower frequency limit) and the highest frequency (i.e., upper frequency limit) that the compressor can achieve need to be set according to different capacity ranges and different models. For example, the lower frequency limit of the compressor can be 10Hz or 20Hz, etc. For example, assuming that the highest frequency of the compressor in cooling / dehumidifying mode is denoted as f0, then when the outdoor ambient temperature Tw is below the first outdoor ambient temperature threshold Tw1, the highest frequency that the compressor can achieve can be f0-25Hz (this frequency can be selected according to the actual air conditioner model and based on actual test data; f0-25Hz is preferably suitable for some models).

[0113] It should be noted that in cooling / dehumidifying mode, the minimum opening degree (i.e., the lower limit of the opening degree) of the electronic expansion valve needs to be set according to different capacity ranges and different air conditioner models, and also needs to be determined in conjunction with the different models of the electronic expansion valve.

[0114] It should be noted that, in this embodiment of the invention, the rotation speed of the outdoor fan can be pre-named from low to high as: low speed, medium speed, medium-high speed, and high speed. The rotation speed corresponding to low speed is the lower limit of the outdoor fan's rotation speed, the rotation speed corresponding to medium speed is the first rotation speed value of the outdoor fan, the rotation speed corresponding to medium-high speed is the second rotation speed value of the outdoor fan, and the rotation speed corresponding to high speed is the upper limit of the outdoor fan's rotation speed. The rotation speed corresponding to different speeds can be set according to the test results, and this embodiment of the invention does not impose specific limitations.

[0115] It should be noted that if the controller determines that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is below the first outdoor ambient temperature threshold Tw1, and the temperature difference ΔT is below the first temperature difference threshold T1, then the compressor and the outdoor fan can be stopped, while the indoor fan remains unchanged. If the controller determines that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is below the first outdoor ambient temperature threshold Tw1, and the temperature difference ΔT is between the first temperature difference threshold T1 and the second temperature difference threshold T2, then the compressor and the outdoor fan can be stopped, while the indoor fan remains unchanged, and the system will restart after a period of time (e.g., 10 minutes) to enter the cooling / dehumidification mode.

[0116] For example, assuming a pre-set first outdoor ambient temperature threshold Tw1 = 20℃, a first temperature difference threshold T1 = -3℃, a second temperature difference threshold T2 = 0℃, and a third temperature difference threshold T3 = 1℃: when Tw < 20℃ and 0℃ ≤ ΔT < 1℃, the compressor's operating frequency is adjusted to the lower limit, the electronic expansion valve's opening is adjusted to the lower limit, and the outdoor fan is set to low speed. After running for 10 minutes, the temperature difference ΔT is reassessed. If 0℃ ≤ ΔT < 1℃, the current control mode remains unchanged, and after running this control mode continuously for 30 minutes, the air conditioner is controlled to enter the oil return mode, and then exits the oil return mode. If ΔT ≥ 1℃, the current control mode is exited, and the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed. When Tw < 20℃ and ΔT ≤ -3℃, the compressor and outdoor fan will stop, while the indoor fan will remain unchanged. When Tw < 20℃ and -3℃ < ΔT < 0℃, the compressor and outdoor fan will stop, while the indoor fan will remain unchanged, and the system will restart after 10 minutes to enter cooling / dehumidification mode.

[0117] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0118] When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening degree value, and the speed of the outdoor fan is adjusted to a preset first speed value.

[0119] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset first compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the first compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

[0120] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5 In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT are determined to meet the following control conditions: the outdoor ambient temperature Tw is below the first outdoor ambient temperature threshold Tw1, and the temperature difference ΔT is between the third temperature difference threshold T3 and the fourth temperature difference threshold T4, a control mode corresponding to the current control conditions met by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset lower frequency limit, the electronic expansion valve's opening is adjusted to a preset lower opening limit, and the outdoor fan's speed is adjusted to a preset first speed value. After a third preset time, it is re-determined whether the temperature difference ΔT is still between the third temperature difference threshold T3 and the fourth temperature difference threshold T4. If so, the electronic expansion valve and outdoor motor remain unchanged, and the compressor's operating frequency is first adjusted within a preset first compressor temperature range, i.e., when the compressor's casing temperature Tp is within the first compression range... Within the machine's operating temperature range, the compressor's operating frequency is continuously increased until it reaches a preset upper frequency limit. While the compressor's casing temperature Tp remains within the first compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the third temperature difference threshold T3 or above the fourth temperature difference threshold T4, at which point the current control mode is exited. Specifically, in the current control mode, if the compressor's operating frequency is below the oil return frequency, and the continuous operating time at this frequency exceeds a preset time threshold (e.g., 30 minutes or more), the air conditioner is controlled to enter the oil return mode, and then exits it. Afterward, the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the outdoor fan speed (equivalent to returning to normal operation). Figure 5 or Figure 6 Step S14 is shown.

[0121] It should be noted that the specific adjustment scheme for adjusting the compressor's operating frequency when the compressor's casing temperature Tp is within the first compressor temperature range can be designed according to different capacity ranges and different models. Based on development experience, the compressor's operating frequency f in this case generally satisfies (1 / 3)*f0≤f≤(1 / 2)*f0. Alternatively, the specific adjustment scheme can be determined through experimental testing according to different capacity ranges and different models. This embodiment of the invention does not impose specific limitations.

[0122] It should be noted that the specific adjustment scheme for adjusting the opening degree of the electronic expansion valve when the compressor housing temperature Tp is within the first compressor temperature range can be designed according to different models of electronic expansion valves. Generally, the electronic control board will automatically adjust to a certain opening degree based on the compressor housing temperature Tp and the different manufacturers and models of electronic expansion valves. Alternatively, it can be set according to different capacity ranges and different models of electronic expansion valves. This embodiment of the invention does not make specific limitations.

[0123] It should be noted that the value of the oil return frequency can be set according to experimental test data. Preferably, the oil return frequency is 35Hz.

[0124] For example, assuming a pre-set first outdoor ambient temperature threshold Tw1 = 20℃, a third temperature difference threshold T3 = 1℃, and a fourth temperature difference threshold T4 = 3℃: when Tw < 20℃ and 1℃ ≤ ΔT < 3℃, the compressor's operating frequency is adjusted to the lower limit, the electronic expansion valve's opening is adjusted to the lower limit, and the outdoor fan is set to medium speed. After running for 3 minutes, the temperature difference ΔT is reassessed. If 1℃ ≤ ΔT < 3℃, the electronic expansion valve and outdoor motor remain unchanged. This continues until 47℃ ≤ When Tp≤53℃, adjust the compressor's operating frequency and re-detect ΔT every minute. When the compressor's operating frequency reaches the upper limit, further adjust the opening of the electronic expansion valve while satisfying 47℃≤Tp≤53℃ until ΔT<1℃ or ΔT≥3℃. Then, exit the current control mode and re-determine the corresponding control mode based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the outdoor fan speed.

[0125] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0126] When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a first preset number of steps, the speed of the outdoor fan is adjusted to a preset first speed value, and the opening of the electronic expansion valve is increased based on a preset second compressor temperature range until the temperature difference is below the fourth temperature difference threshold. Then, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0127] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5 In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT are determined to meet the following control conditions: the outdoor ambient temperature Tw is below the first outdoor ambient temperature threshold Tw1, and the temperature difference ΔT is above the fourth temperature difference threshold T4, a control mode corresponding to the current control conditions met by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset upper frequency value, the electronic expansion valve's opening is adjusted to the sum of a preset lower opening limit and a first preset number of steps, and the outdoor fan's speed is adjusted to a preset first speed value. Then, when the compressor's casing temperature Tp is within a preset second compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the fourth temperature difference threshold T4. At this point, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed (equivalent to returning to the previous state). Figure 5 or Figure 6 Step S14 is shown.

[0128] It should be noted that the specific adjustment scheme for adjusting the opening degree of the electronic expansion valve when the compressor housing temperature Tp is within the second compressor temperature range can be designed according to different models of electronic expansion valves. Generally, the electronic control board will automatically adjust to a certain opening degree based on the compressor housing temperature Tp and the different manufacturers and models of electronic expansion valves. Alternatively, it can be set according to different capacity ranges and different models of electronic expansion valves. This embodiment of the invention does not make specific limitations.

[0129] For example, assuming the first outdoor ambient temperature threshold Tw1 = 20℃, the fourth temperature difference threshold T4 = 3℃, and the first preset number of steps = 30 steps: when Tw < 20℃ and ΔT ≥ 3℃, adjust the compressor's operating frequency to the upper limit of the frequency, i.e., f = f0 - 25Hz, adjust the opening of the electronic expansion valve to the sum of the lower limit of the opening and 30 steps, and adjust the outdoor fan to medium speed operation. Then, when 55℃ ≤ Tp ≤ 58℃ is met, adjust the opening of the electronic expansion valve until ΔT < 3℃ is met, exit the current control mode, and re-determine the corresponding control mode based on the outdoor ambient temperature Tw and the temperature difference ΔT, so as to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0130] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0131] When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset lower speed limit according to the determined control mode.

[0132] Furthermore, after a first preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the third temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0133] Combination Figure 7 The diagram shown is another flowchart of a controller for an air conditioner provided in an embodiment of the present invention. Based on the above embodiments, in specific implementation of this embodiment, the controller executes... Figure 5In step S16, when it is determined that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is between the first outdoor ambient temperature threshold Tw1 and the second outdoor ambient temperature threshold Tw2, and the temperature difference ΔT is between the second temperature difference threshold T2 and the third temperature difference threshold T3, the control mode corresponding to the control conditions currently met by the outdoor ambient temperature Tw and the temperature difference ΔT is further determined. Figure 7 As shown in step S1621), the compressor's operating frequency is adjusted to a preset lower frequency limit according to the determined control mode, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the outdoor fan speed is adjusted to a preset lower speed limit. Figure 7 Step S1622 (as shown); After running for the first preset time, re-determine whether the temperature difference ΔT is still between the second temperature difference threshold T2 and the third temperature difference threshold T3. Figure 7 If the step S1623 shown is true, then the current control mode remains unchanged. Figure 7 As shown in step S1624), and after running for the second preset time period, control the air conditioner to enter the oil return mode ( Figure 7 (See step S1625); If not, for example, if the temperature difference ΔT is above the third temperature difference threshold T3, then exit the current control mode. Figure 7 As shown in step S1626), the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT, in order to readjust the compressor's operating frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan (equivalent to returning to the previous step). Figure 5 or Figure 6 Step S14 is shown.

[0134] It should be noted that, assuming the highest frequency of the compressor operation in cooling / dehumidification mode is denoted as f0, then when the outdoor ambient temperature Tw is between the first outdoor ambient temperature threshold Tw1 and the second outdoor ambient temperature threshold Tw2, the highest frequency that the compressor can achieve can be f0-15Hz (this frequency can be selected according to the actual air conditioner model and based on actual test data; f0-15Hz is preferably applicable to some models).

[0135] It should be noted that if the controller determines that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is between the first outdoor ambient temperature threshold Tw1 and the second outdoor ambient temperature threshold Tw2, and the temperature difference ΔT is below the first temperature difference threshold T1, then the compressor and the outdoor fan can be stopped, while the indoor fan remains unchanged. If the controller determines that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is between the first outdoor ambient temperature threshold Tw1 and the second outdoor ambient temperature threshold Tw2, and the temperature difference ΔT is between the first temperature difference threshold T1 and the second temperature difference threshold T2, then the unit can be stopped for a period of time (e.g., 10 minutes) and then restarted to enter the cooling / dehumidification mode.

[0136] For example, assuming the pre-set first outdoor ambient temperature threshold Tw1 = 20℃, the second outdoor ambient temperature threshold Tw2 = 28℃, the first temperature difference threshold T1 = -3℃, the second temperature difference threshold T2 = 0℃, and the third temperature difference threshold T3 = 1℃: when 20℃ ≤ Tw < 28℃ and 0℃ ≤ ΔT < 1℃, the compressor's operating frequency is adjusted to the lower limit, the electronic expansion valve's opening is adjusted to the lower limit, and the outdoor fan is set to low speed. After running for 10 minutes, the temperature difference ΔT is reassessed. If 0℃ ≤ ΔT < 1℃, the current control mode remains unchanged, and after running this control mode continuously for 30 minutes, the air conditioner is controlled to enter the oil return mode, and then exits the oil return mode. If ΔT ≥ 1℃, the current control mode is exited, and the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed. When the temperature meets the conditions of 20℃≤Tw<28℃ and ΔT≤-3℃, the compressor and outdoor fan will stop, while the indoor fan will remain unchanged. When the temperature meets the conditions of 20℃≤Tw<28℃ and -3℃<ΔT<0℃, the unit will stop for 10 minutes before restarting in cooling / dehumidification mode.

[0137] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0138] When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset first speed value.

[0139] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

[0140] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT satisfy the following control conditions: the outdoor ambient temperature Tw is between the first outdoor ambient temperature threshold Tw1 and the second outdoor ambient temperature threshold Tw2, and the temperature difference ΔT is between the third temperature difference threshold T3 and the fourth temperature difference threshold T4, a control mode corresponding to the control conditions currently satisfied by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset lower frequency limit, the electronic expansion valve's opening is adjusted to a preset lower opening limit, and the outdoor fan's speed is adjusted to a preset first speed value. After a third preset time, it is re-evaluated whether the temperature difference ΔT is still between the third temperature difference threshold T3 and the fourth temperature difference threshold T4. If so, the electronic expansion valve and outdoor motor remain unchanged, and the compressor's operating frequency is first adjusted within a preset second compressor temperature range, i.e., within the compressor's casing temperature Tp. When the compressor is within the second compressor temperature range, the compressor's operating frequency is continuously increased until it reaches a preset upper frequency limit. While the compressor casing temperature Tp is within the second compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the third temperature difference threshold T3 or above the fourth temperature difference threshold T4, at which point the current control mode is exited. Specifically, in the current control mode, if the compressor's operating frequency is below the oil return frequency, and the continuous operating time at this frequency exceeds a preset time threshold (e.g., 30 minutes or more), the air conditioner is controlled to enter the oil return mode, and then exits it. Afterward, the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the outdoor fan speed (equivalent to returning to normal operation). Figure 5 or Figure 6 Step S14 is shown.

[0141] It should be noted that the specific adjustment scheme for adjusting the operating frequency of the compressor when the compressor casing temperature Tp is within the second compressor temperature range can be designed according to different capacity ranges and different models. Alternatively, the specific adjustment scheme can be determined through experimental testing according to different capacity ranges and different models. This embodiment of the invention does not impose specific limitations.

[0142] It should be noted that the specific adjustment scheme for adjusting the opening degree of the electronic expansion valve when the compressor housing temperature Tp is within the second compressor temperature range can be designed according to different models of electronic expansion valves. Generally, the electronic control board will automatically adjust to a certain opening degree based on the compressor housing temperature Tp and the different manufacturers and models of electronic expansion valves. Alternatively, it can be set according to different capacity ranges and different models of electronic expansion valves. This embodiment of the invention does not make specific limitations.

[0143] For example, assuming the pre-set first outdoor ambient temperature threshold Tw1 = 20℃, the second outdoor ambient temperature threshold Tw1 = 28℃, the third temperature difference threshold T3 = 1℃, and the fourth temperature difference threshold T4 = 3℃: when 20℃ ≤ Tw < 28℃ and 1℃ ≤ ΔT < 3℃, the compressor's operating frequency is adjusted to the lower limit, the electronic expansion valve's opening is adjusted to the lower limit, and the outdoor fan is set to medium speed. After running for 3 minutes, the temperature difference ΔT is reassessed. If 1℃ ≤ ΔT < 3℃, the electronic expansion valve and outdoor motor remain unchanged. Without changing the operating frequency, while ensuring that 55℃≤Tp≤58℃, the compressor's operating frequency is adjusted, and ΔT is re-detected every minute. When the compressor's operating frequency reaches the upper limit, the opening of the electronic expansion valve is further adjusted while ensuring that 55℃≤Tp≤58℃ is met, until ΔT<1℃ or ΔT≥3℃ is met. Then, the current control mode is exited, and the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT, so as to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0144] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0145] When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a second preset number of steps, the speed of the outdoor fan is adjusted to a preset first speed value, and the opening of the electronic expansion valve is increased based on a preset third compressor temperature range until the temperature difference is below the fourth temperature difference threshold. Then, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0146] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5 In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT satisfy the following control conditions: the outdoor ambient temperature Tw is between the first outdoor ambient temperature threshold Tw1 and the second outdoor ambient temperature threshold Tw2, and the temperature difference ΔT is above the fourth temperature difference threshold T4, a control mode corresponding to the current control conditions satisfied by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset upper frequency value, the electronic expansion valve's opening is adjusted to the sum of a preset lower opening value and a second preset number of steps, and the outdoor fan's speed is adjusted to a preset first speed value. Then, when the compressor's casing temperature Tp is within a preset third compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the fourth temperature difference threshold T4. At this point, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed (equivalent to returning to the previous state). Figure 5 or Figure 6 Step S14 is shown.

[0147] It should be noted that the specific adjustment scheme for adjusting the opening degree of the electronic expansion valve when the compressor housing temperature Tp is within the third compressor temperature range can be designed according to different models of electronic expansion valves. Generally, the electronic control board will automatically adjust to a certain opening degree based on the compressor housing temperature Tp and the different manufacturers and models of electronic expansion valves. Alternatively, it can be set according to different capacity ranges and different models of electronic expansion valves. This embodiment of the invention does not make specific limitations.

[0148] For example, assuming the preset first outdoor ambient temperature threshold Tw1 = 20℃, the second outdoor ambient temperature threshold Tw2 = 28℃, the fourth temperature difference threshold T4 = 3℃, and the second preset number of steps = 30 steps: when 20℃≤Tw<28℃ and ΔT≥3℃ are met, the compressor's operating frequency is adjusted to the upper limit of the frequency, i.e., f = f0 - 15Hz, the opening of the electronic expansion valve is adjusted to the sum of the lower limit of the opening and 30 steps, and the outdoor fan is adjusted to run at medium speed. Then, when 60℃≤Tp≤63℃ are met, the opening of the electronic expansion valve is adjusted until ΔT<3℃ is met, the current control mode is exited, and the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT, so as to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0149] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0150] When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset first speed value according to the determined control mode.

[0151] Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and the control mode is redefined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0152] Combination Figure 8 The diagram shown is another flowchart of a controller for an air conditioner provided in an embodiment of the present invention. Based on the above embodiments, in specific implementation of this embodiment, the controller executes... Figure 5 In step S16, when it is determined that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is between the second outdoor ambient temperature threshold Tw2 and the third outdoor ambient temperature threshold Tw3, and the temperature difference ΔT is between the first temperature difference threshold T1 and the second temperature difference threshold T2, the control mode corresponding to the control conditions currently met by the outdoor ambient temperature Tw and the temperature difference ΔT is further determined. Figure 8 As shown in step S1631), the compressor's operating frequency is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the outdoor fan speed is adjusted to a preset first speed value. Figure 8 Step S1632 (as shown); After running for the first preset time, re-determine whether the temperature difference ΔT is still between the first temperature difference threshold T1 and the second temperature difference threshold T2. Figure 8 If the step shown in S1633 is correct, then the current control mode remains unchanged. Figure 8 As shown in step S1634), and after running for the second preset time period, control the air conditioner to enter the oil return mode ( Figure 8 (See step S1635); If not, for example, if the temperature difference ΔT is above the second temperature difference threshold T2, then exit the current control mode. Figure 8 As shown in step S1636), the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT, in order to readjust the compressor's operating frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan (equivalent to returning to the previous step). Figure 5 or Figure 6 Step S14 is shown.

[0153] It should be noted that, assuming the highest frequency of compressor operation in cooling / dehumidification mode is denoted as f0, then when the outdoor ambient temperature Tw is between the second outdoor ambient temperature threshold Tw2 and the third outdoor ambient temperature threshold Tw3, the highest frequency that the compressor can achieve can be f0.

[0154] It should be noted that if the controller determines that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is between the second outdoor ambient temperature threshold Tw2 and the third outdoor ambient temperature threshold Tw3, and the temperature difference ΔT is below the first temperature difference threshold T1, then the controller can control the compressor to stop, control the outdoor fan to stop, and control the indoor fan to remain unchanged.

[0155] For example, assuming the pre-set second outdoor ambient temperature threshold Tw2 = 28℃, the third outdoor ambient temperature threshold Tw3 = 38℃, the first temperature difference threshold T1 = -3℃, and the second temperature difference threshold T2 = 0℃: when 28℃ ≤ Tw < 38℃ and -3℃ ≤ ΔT < 0℃, the compressor's operating frequency is adjusted to the lower limit, the electronic expansion valve's opening is adjusted to the lower limit, and the outdoor fan is set to medium speed. After running for 10 minutes, the temperature difference ΔT is reassessed. If -3℃ ≤ ΔT < 0℃, the current control mode remains unchanged, and after running this control mode continuously for 30 minutes, the air conditioner is controlled to enter the oil return mode, and then exits the oil return mode. If ΔT ≥ 0℃, the current control mode is exited, and the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed. When 20℃≤Tw<28℃ and ΔT≤-3℃ are met, the compressor and outdoor fan are stopped, while the indoor fan remains unchanged.

[0156] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0157] When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset first speed value.

[0158] Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

[0159] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT satisfy the following control conditions: the outdoor ambient temperature Tw is between the second outdoor ambient temperature threshold Tw2 and the third outdoor ambient temperature threshold Tw3, and the temperature difference ΔT is between the second temperature difference threshold T2 and the third temperature difference threshold T3, a control mode corresponding to the current control conditions satisfied by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset lower frequency limit, the electronic expansion valve's opening is adjusted to a preset lower opening limit, and the outdoor fan's speed is adjusted to a preset first speed value. After a third preset time, it is re-evaluated whether the temperature difference ΔT is still between the second temperature difference threshold T2 and the third temperature difference threshold T3. If so, the electronic expansion valve and outdoor motor remain unchanged, and the compressor's operating frequency is first adjusted within a preset second compressor temperature range, i.e., within the compressor's casing temperature Tp. When the compressor is within the second compressor temperature range, the compressor's operating frequency is continuously increased until it reaches a preset upper frequency limit. While the compressor casing temperature Tp is within the second compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the second temperature difference threshold T2 or above the third temperature difference threshold T3, at which point the current control mode is exited. Specifically, in the current control mode, if the compressor's operating frequency is below the oil return frequency, and the continuous operating time at this frequency exceeds a preset time threshold (e.g., 30 minutes or more), the air conditioner is controlled to enter the oil return mode, and then exits it. Afterward, the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the outdoor fan speed (equivalent to returning to normal operation). Figure 5 or Figure 6 Step S14 is shown.

[0160] For example, assuming the pre-set second outdoor ambient temperature threshold Tw2 = 28℃, the third outdoor ambient temperature threshold Tw3 = 38℃, the second temperature difference threshold T2 = 0℃, and the third temperature difference threshold T3 = 1℃: when 28℃ ≤ Tw < 38℃ and 0℃ ≤ ΔT < 1℃, adjust the compressor's operating frequency to the lower limit, adjust the electronic expansion valve's opening to the lower limit, and adjust the outdoor fan to medium speed. After running for 3 minutes, re-evaluate the temperature difference ΔT. If 0℃ ≤ ΔT < 1℃, then the electronic expansion valve and outdoor motor remain unchanged. Without changing the operating frequency, while ensuring that 55℃≤Tp≤58℃, the compressor's operating frequency is adjusted, and ΔT is re-detected every minute. When the compressor's operating frequency reaches the upper limit, the opening of the electronic expansion valve is further adjusted while ensuring that 55℃≤Tp≤58℃, until ΔT<0℃ or ΔT≥1℃ is satisfied. Then, the current control mode is exited, and the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT, so as to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0161] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0162] When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0163] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset fourth compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the fourth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0164] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT satisfy the following control conditions: the outdoor ambient temperature Tw is between the second outdoor ambient temperature threshold Tw2 and the third outdoor ambient temperature threshold Tw3, and the temperature difference ΔT is between the third temperature difference threshold T3 and the fourth temperature difference threshold T4, a control mode corresponding to the control conditions currently satisfied by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset lower frequency limit, the electronic expansion valve's opening is adjusted to a preset lower opening limit, and the outdoor fan's speed is adjusted to a preset second speed value. After a third preset running time, it is re-evaluated whether the temperature difference ΔT is still between the third temperature difference threshold T3 and the fourth temperature difference threshold T4. If so, the electronic expansion valve... The valve and outdoor motor remain unchanged. First, the compressor's operating frequency is adjusted within the preset fourth compressor temperature range. That is, while the compressor casing temperature Tp is within the fourth compressor temperature range, the compressor's operating frequency is continuously increased until it reaches the preset upper frequency limit. Then, while the compressor casing temperature Tp is within the fourth compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the third temperature difference threshold T3 or above the fourth temperature difference threshold T4. At this point, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the outdoor fan speed (equivalent to returning to the previous state). Figure 5 or Figure 6 Step S14 is shown.

[0165] It should be noted that the specific adjustment scheme for adjusting the operating frequency of the compressor when the compressor casing temperature Tp is within the fourth compressor temperature range can be designed according to different capacity ranges and different models. Alternatively, the specific adjustment scheme can be determined through experimental testing according to different capacity ranges and different models. This embodiment of the invention does not impose specific limitations.

[0166] It should be noted that the specific adjustment scheme for adjusting the opening degree of the electronic expansion valve when the compressor housing temperature Tp is within the fourth compressor temperature range can be designed according to different models of electronic expansion valves. Generally, the electronic control board will automatically adjust to a certain opening degree based on the compressor housing temperature Tp and the different manufacturers and models of electronic expansion valves. Alternatively, it can be set according to different capacity ranges and different models of electronic expansion valves. This embodiment of the invention does not make specific limitations.

[0167] For example, assuming the pre-set second outdoor ambient temperature threshold Tw2 = 28℃, the third outdoor ambient temperature threshold Tw3 = 38℃, the third temperature difference threshold T3 = 1℃, and the fourth temperature difference threshold T4 = 3℃: when 28℃ ≤ Tw < 38℃ and 1℃ ≤ ΔT < 3℃, adjust the compressor's operating frequency to the lower limit, adjust the electronic expansion valve's opening to the lower limit, and adjust the outdoor fan to medium-high speed operation. After running for 3 minutes, re-evaluate the temperature difference ΔT. If 1℃ ≤ ΔT < 3℃, then the electronic expansion valve and outdoor motor maintain their current settings. Without changing the status, while satisfying 65℃≤Tp≤68℃, the operating frequency of the compressor is adjusted, and ΔT is re-detected every minute. When the operating frequency of the compressor reaches the upper limit, the opening of the electronic expansion valve is further adjusted while satisfying 65℃≤Tp≤68℃, until ΔT<1℃ or ΔT≥3℃ is satisfied. Then, the current control mode is exited, and the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT, so as to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0168] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0169] When the outdoor ambient temperature is between the second and third outdoor ambient temperature thresholds, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a third preset number of steps, the speed of the outdoor fan is adjusted to a preset second speed value, and the opening of the electronic expansion valve is increased based on a preset fifth compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0170] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT satisfy the following control conditions: the outdoor ambient temperature Tw is between the second outdoor ambient temperature threshold Tw2 and the third outdoor ambient temperature threshold Tw3, and the temperature difference ΔT is above the fourth temperature difference threshold T4, a control mode corresponding to the current control conditions satisfied by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset upper frequency value, the electronic expansion valve's opening is adjusted to the sum of a preset lower opening value and a third preset step number, and the outdoor fan's speed is adjusted to a preset second speed value. Then, when the compressor's casing temperature Tp is within a preset fifth compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the fourth temperature difference threshold T4. At this point, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed (equivalent to returning to the previous state). Figure 5 or Figure 6 Step S14 is shown.

[0171] It should be noted that the specific adjustment scheme for adjusting the opening degree of the electronic expansion valve when the compressor housing temperature Tp is within the fifth compressor temperature range can be designed according to different models of electronic expansion valves. Generally, the electronic control board will automatically adjust to a certain opening degree based on the compressor housing temperature Tp and the different manufacturers and models of electronic expansion valves. Alternatively, it can be set according to different capacity ranges and different models of electronic expansion valves. This embodiment of the invention does not impose specific limitations.

[0172] For example, assuming the pre-set second outdoor ambient temperature threshold Tw2 = 28℃, the third outdoor ambient temperature threshold Tw3 = 38℃, the fourth temperature difference threshold T4 = 3℃, and the third preset number of steps = 80 steps: when 28℃≤Tw<38℃ and ΔT≥3℃ are met, the compressor's operating frequency is adjusted to the upper limit of the frequency, i.e., f = f0, the opening of the electronic expansion valve is adjusted to the sum of the lower limit of the opening and 80 steps, and the outdoor fan is adjusted to run at medium to high speed. Then, when 75℃≤Tp≤78℃ are met, the opening of the electronic expansion valve is adjusted until ΔT<3℃ is met, the current control mode is exited, and the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT, so as to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0173] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0174] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0175] Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0176] See Figure 9 The diagram shown is another flowchart of a controller for an air conditioner provided in an embodiment of the present invention. Based on the above embodiments, in specific implementation of this embodiment, the controller executes... Figure 5 In step S16, when it is determined that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is between the third outdoor ambient temperature threshold Tw3 and the fourth outdoor ambient temperature threshold Tw4, and the temperature difference ΔT is between the first temperature difference threshold T1 and the second temperature difference threshold T2, the control mode corresponding to the control conditions currently met by the outdoor ambient temperature Tw and the temperature difference ΔT is further determined. Figure 9 As shown in step S1641), the compressor's operating frequency is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the outdoor fan speed is adjusted to a preset second speed value. Figure 9 Step S1642 (as shown); After running for the first preset time, re-determine whether the temperature difference ΔT is still between the first temperature difference threshold T1 and the second temperature difference threshold T2. Figure 9 If the step shown in S1643 is correct, then the current control mode remains unchanged. Figure 9 Step S1644 shown); if not, for example, if the temperature difference ΔT is above the second temperature difference threshold T2, then exit the current control mode. Figure 9As shown in step S1645), the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT, in order to readjust the compressor's operating frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan (equivalent to returning to the previous step). Figure 5 or Figure 6 Step S14 is shown.

[0177] It should be noted that, assuming the highest frequency of the compressor operation in cooling / dehumidification mode is denoted as f0, then when the outdoor ambient temperature Tw is between the third outdoor ambient temperature threshold Tw3 and the fourth outdoor ambient temperature threshold Tw4, the highest frequency that the compressor can achieve is f0-15Hz (this frequency can be selected according to the actual air conditioner model and based on actual test data; f0-15Hz is preferred for some models).

[0178] It should be noted that if the controller determines that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is between the third outdoor ambient temperature threshold Tw3 and the fourth outdoor ambient temperature threshold Tw4, and the temperature difference ΔT is below the first temperature difference threshold T1, then the controller can control the compressor to stop, control the outdoor fan to stop, and control the indoor fan to remain unchanged.

[0179] For example, assuming a pre-set third outdoor ambient temperature threshold Tw3 = 38℃, a fourth outdoor ambient temperature threshold Tw4 = 45℃, a first temperature difference threshold T1 = -3℃, and a second temperature difference threshold T2 = 0℃: When 38℃ ≤ Tw < 45℃ and -3℃ ≤ ΔT < 0℃ are met, the compressor's operating frequency is adjusted to the lower limit, the electronic expansion valve's opening is adjusted to the lower limit, and the outdoor fan is set to medium-high speed operation. After 10 minutes of operation, the temperature difference ΔT is reassessed. If -3℃ ≤ ΔT < 0℃, the current control mode remains unchanged; if ΔT ≥ 0℃, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed. When 38℃ ≤ Tw < 45℃ and ΔT ≤ -3℃ are met, the compressor and outdoor fan are stopped, while the indoor fan remains unchanged.

[0180] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0181] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset second speed value according to the determined control mode.

[0182] Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0183] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT are determined to meet the following control conditions: the outdoor ambient temperature Tw is between the third outdoor ambient temperature threshold Tw3 and the fourth outdoor ambient temperature threshold Tw4, and the temperature difference ΔT is between the second temperature difference threshold T2 and the third temperature difference threshold T3, a control mode corresponding to the control conditions currently met by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset lower frequency limit, the electronic expansion valve's opening is adjusted to a preset lower opening limit, and the outdoor fan's speed is adjusted to a preset second speed value. After a third preset running time, it is re-determined whether the temperature difference ΔT is still between the second temperature difference threshold T2 and the third temperature difference threshold T3. If so, the electronic expansion valve... The valve and outdoor motor remain unchanged. First, the compressor's operating frequency is adjusted within the preset second compressor temperature range. That is, while the compressor casing temperature Tp is within the second compressor temperature range, the compressor's operating frequency is continuously increased until it reaches the preset upper frequency limit. Then, while the compressor casing temperature Tp is within the second compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the second temperature difference threshold T2 or above the third temperature difference threshold T3. At this point, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the outdoor fan speed (equivalent to returning to the previous state). Figure 5 or Figure 6 Step S14 is shown.

[0184] For example, assuming the pre-set third outdoor ambient temperature threshold Tw3 = 38℃, the fourth outdoor ambient temperature threshold Tw4 = 45℃, the second temperature difference threshold T2 = 0℃, and the third temperature difference threshold T3 = 1℃: when 38℃ ≤ Tw < 45℃ and 0℃ ≤ ΔT < 1℃, adjust the compressor's operating frequency to the lower limit, adjust the electronic expansion valve's opening to the lower limit, and adjust the outdoor fan to medium-high speed operation. After running for 3 minutes, re-evaluate the temperature difference ΔT. If 0℃ ≤ ΔT < 1℃, then the electronic expansion valve and outdoor motor maintain their current settings. Without changing the status, the compressor's operating frequency is adjusted while satisfying 55℃≤Tp≤58℃. ΔT is re-detected every minute. When the compressor's operating frequency reaches the upper limit, the opening of the electronic expansion valve is further adjusted while satisfying 55℃≤Tp≤58℃ until ΔT<0℃ or ΔT≥1℃ is satisfied. Then, the current control mode is exited, and the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the outdoor fan speed.

[0185] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0186] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset upper speed limit according to the determined control mode.

[0187] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the opening of the electronic expansion valve is adjusted to the sum of a preset lower limit and a fourth preset number of steps. The operating frequency of the compressor is increased based on a preset fifth compressor temperature range until the compressor's operating frequency reaches a preset upper limit. Then, the opening of the electronic expansion valve is increased based on the fifth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed.

[0188] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT are determined to meet the following control conditions: the outdoor ambient temperature Tw is between the third outdoor ambient temperature threshold Tw3 and the fourth outdoor ambient temperature threshold Tw4, and the temperature difference ΔT is between the third temperature difference threshold T3 and the fourth temperature difference threshold T4, a control mode corresponding to the control conditions currently met by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset lower frequency limit, the electronic expansion valve's opening is adjusted to a preset lower opening limit, and the outdoor fan's speed is adjusted to a preset upper speed limit. After a third preset running time, it is re-determined whether the temperature difference ΔT is still between the third temperature difference threshold T3 and the fourth temperature difference threshold T4. If so, the outdoor motor remains unchanged, and the electronic expansion valve is adjusted... The valve opening is the sum of a preset lower limit and a fourth preset step. The compressor's operating frequency is adjusted within a preset fifth compressor temperature range. Specifically, when the compressor casing temperature Tp is within the fifth compressor temperature range, the compressor's operating frequency is continuously increased until it reaches a preset upper limit. Then, while the compressor casing temperature Tp is still within the fifth compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the third temperature difference threshold T3 or above the fourth temperature difference threshold T4. At this point, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed (equivalent to returning to the previous state). Figure 5 or Figure 6 Step S14 is shown.

[0189] It should be noted that the specific adjustment scheme for adjusting the compressor's operating frequency when the compressor's casing temperature Tp is within the fifth compressor temperature range can be designed according to different capacity ranges and different models. Alternatively, the specific adjustment scheme can be determined through experimental testing according to different capacity ranges and different models. This embodiment of the invention does not impose specific limitations.

[0190] It should be noted that the specific adjustment scheme for adjusting the opening degree of the electronic expansion valve when the compressor housing temperature Tp is within the fifth compressor temperature range can be designed according to different models of electronic expansion valves. Generally, the electronic control board will automatically adjust to a certain opening degree based on the compressor housing temperature Tp and the different manufacturers and models of electronic expansion valves. Alternatively, it can be set according to different capacity ranges and different models of electronic expansion valves. This embodiment of the invention does not impose specific limitations.

[0191] For example, assuming the preset third outdoor ambient temperature threshold Tw3 = 38℃, the fourth outdoor ambient temperature threshold Tw4 = 45℃, the third temperature difference threshold T3 = 1℃, the fourth temperature difference threshold T4 = 3℃, and the fourth preset number of steps = 50 steps: When 38℃ ≤ Tw < 45℃ and 1℃ ≤ ΔT < 3℃ are met, adjust the compressor's operating frequency to the lower limit, adjust the electronic expansion valve's opening to the lower limit, and adjust the outdoor fan to high-speed operation. After running for 3 minutes, re-evaluate the temperature difference ΔT. If 1℃ ≤ ΔT < 3℃, the outdoor motor remains unchanged, and the electronic expansion valve is adjusted... The opening degree is the sum of the lower limit of the opening degree and 50 steps. Under the condition that 75℃≤Tp≤78℃ is satisfied, the operating frequency of the compressor is adjusted. ΔT is re-detected every 1 minute. When the operating frequency of the compressor reaches the upper limit of the frequency, the opening degree of the electronic expansion valve is further adjusted under the condition that 75℃≤Tp≤78℃ is satisfied until ΔT<1℃ or ΔT≥3℃ is satisfied. Then, the current control mode is exited, and the corresponding control mode is re-determined according to the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0192] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0193] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a fifth preset step value, the speed of the outdoor fan is adjusted to a preset upper speed value, and the opening of the electronic expansion valve is increased based on a preset sixth compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0194] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT satisfy the following control conditions: the outdoor ambient temperature Tw is between the third outdoor ambient temperature threshold Tw3 and the fourth outdoor ambient temperature threshold Tw4, and the temperature difference ΔT is above the fourth temperature difference threshold T4, a control mode corresponding to the current control conditions satisfied by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset upper frequency value, the electronic expansion valve's opening is adjusted to the sum of a preset lower opening value and a fifth preset step number, and the outdoor fan's speed is adjusted to a preset upper speed value. Then, when the compressor's casing temperature Tp is within a preset sixth compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the fourth temperature difference threshold T4. At this point, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed (equivalent to returning to the previous state). Figure 5 or Figure 6 Step S14 is shown.

[0195] It should be noted that the specific adjustment scheme for adjusting the opening degree of the electronic expansion valve when the compressor housing temperature Tp is within the sixth compressor temperature range can be designed according to different models of electronic expansion valves. Generally, the electronic control board will automatically adjust to a certain opening degree based on the compressor housing temperature Tp and the different manufacturers and models of electronic expansion valves. Alternatively, it can be set according to different capacity ranges and different models of electronic expansion valves. This embodiment of the invention does not impose specific limitations.

[0196] For example, assuming the preset third outdoor ambient temperature threshold Tw3 = 38℃, the fourth outdoor ambient temperature threshold Tw4 = 45℃, the fourth temperature difference threshold T4 = 3℃, and the fifth preset number of steps = 100 steps: when 38℃≤Tw<45℃ and ΔT≥3℃ are met, the compressor's operating frequency is adjusted to the upper limit of the frequency, i.e., f = f0 - 15Hz, the opening of the electronic expansion valve is adjusted to the sum of the lower limit of the opening and 100 steps, and the outdoor fan is adjusted to high-speed operation. Then, when 82℃≤Tp≤85℃ are met, the opening of the electronic expansion valve is adjusted until ΔT<3℃ is met, the current control mode is exited, and the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT, so as to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0197] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0198] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0199] Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0200] See Figure 10 The diagram shown is another flowchart of a controller for an air conditioner provided in an embodiment of the present invention. Based on the above embodiments, in specific implementation of this embodiment, the controller executes... Figure 5 In step S16, when it is determined that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is between the fourth outdoor ambient temperature threshold Tw4 and the fifth outdoor ambient temperature threshold Tw5, and the temperature difference ΔT is between the first temperature difference threshold T1 and the second temperature difference threshold T2, the control mode corresponding to the control conditions currently met by the outdoor ambient temperature Tw and the temperature difference ΔT is further determined. Figure 10 As shown in step S1651), the compressor's operating frequency is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the outdoor fan speed is adjusted to a preset second speed value. Figure 10 Step S1652 (as shown); After running for the first preset time, re-determine whether the temperature difference ΔT is still between the first temperature difference threshold T1 and the second temperature difference threshold T2. Figure 10 If step S1653 is as shown, then the current control mode remains unchanged. Figure 10 Step S1654 (as shown); if not, for example, if the temperature difference ΔT is above the second temperature difference threshold T2, then exit the current control mode. Figure 10As shown in step S1655), the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT, in order to readjust the compressor's operating frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan (equivalent to returning to the previous step). Figure 5 or Figure 6 Step S14 is shown.

[0201] It should be noted that, assuming the highest frequency of the compressor operation in cooling / dehumidification mode is denoted as f0, then when the outdoor ambient temperature Tw is between the fourth outdoor ambient temperature threshold Tw4 and the fifth outdoor ambient temperature threshold Tw5, the highest frequency that the compressor can achieve is f0-25Hz (this frequency can be selected according to the actual air conditioner model and based on actual test data; f0-25Hz is preferred for some models).

[0202] It should be noted that if the controller determines that the outdoor ambient temperature Tw and the temperature difference ΔT meet the following control conditions: the outdoor ambient temperature Tw is between the fourth outdoor ambient temperature threshold Tw4 and the fifth outdoor ambient temperature threshold Tw5, and the temperature difference ΔT is below the first temperature difference threshold T1, then the controller can control the compressor to stop, control the outdoor fan to stop, and control the indoor fan to remain unchanged.

[0203] For example, assuming a pre-set fourth outdoor ambient temperature threshold Tw4 = 45℃, a fifth outdoor ambient temperature threshold Tw5 = 50℃, a first temperature difference threshold T1 = -3℃, and a second temperature difference threshold T2 = 0℃: When 45℃ ≤ Tw ≤ 50℃ and -3℃ ≤ ΔT < 0℃ are satisfied, the compressor's operating frequency is adjusted to the lower limit, the electronic expansion valve's opening is adjusted to the lower limit, and the outdoor fan is set to medium-high speed operation. After 10 minutes of operation, the temperature difference ΔT is reassessed. If -3℃ ≤ ΔT < 0℃, the current control mode remains unchanged; if ΔT ≥ 0℃, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed. When 45℃ ≤ Tw ≤ 50℃ and ΔT ≤ -3℃ are satisfied, the compressor and outdoor fan are stopped, while the indoor fan remains unchanged.

[0204] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0205] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0206] Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset fourth compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the fourth compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0207] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT are determined to meet the following control conditions: the outdoor ambient temperature Tw is between the fourth outdoor ambient temperature threshold Tw4 and the fifth outdoor ambient temperature threshold Tw5, and the temperature difference ΔT is between the second temperature difference threshold T2 and the third temperature difference threshold T3, a control mode corresponding to the control conditions currently met by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset lower frequency limit, the electronic expansion valve's opening is adjusted to a preset lower opening limit, and the outdoor fan's speed is adjusted to a preset second speed value. After a third preset running time, it is re-determined whether the temperature difference ΔT is still between the second temperature difference threshold T2 and the third temperature difference threshold T3. If so, the electronic expansion valve... The valve and outdoor motor remain unchanged. First, the compressor's operating frequency is adjusted within the preset fourth compressor temperature range. That is, while the compressor casing temperature Tp is within the fourth compressor temperature range, the compressor's operating frequency is continuously increased until it reaches the preset upper frequency limit. Then, while the compressor casing temperature Tp is within the fourth compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the second temperature difference threshold T2 or above the third temperature difference threshold T3. At this point, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the outdoor fan speed (equivalent to returning to the previous state). Figure 5 or Figure 6 Step S14 is shown.

[0208] For example, assuming the pre-set fourth outdoor ambient temperature threshold Tw4 = 45℃, the fifth outdoor ambient temperature threshold Tw5 = 50℃, the second temperature difference threshold T2 = 0℃, and the third temperature difference threshold T3 = 1℃: when 45℃ ≤ Tw ≤ 50℃ and 0℃ ≤ ΔT < 1℃, the compressor's operating frequency is adjusted to the lower limit, the electronic expansion valve's opening is adjusted to the lower limit, and the outdoor fan is set to medium-high speed operation. After running for 3 minutes, the temperature difference ΔT is reassessed. If 0℃ ≤ ΔT < 1℃, the electronic expansion valve and outdoor motor remain unchanged. Without changing the status, while satisfying 65℃≤Tp≤68℃, the operating frequency of the compressor is adjusted, and ΔT is re-detected every minute. When the operating frequency of the compressor reaches the upper limit, the opening of the electronic expansion valve is further adjusted while satisfying 65℃≤Tp≤68℃ until ΔT<0℃ or ΔT≥1℃ is satisfied. Then, the current control mode is exited, and the corresponding control mode is re-determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0209] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0210] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset upper speed limit according to the determined control mode.

[0211] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the opening of the electronic expansion valve is adjusted to the sum of a preset lower limit and a sixth preset number of steps. The operating frequency of the compressor is increased based on a preset fifth compressor temperature range until the compressor's operating frequency reaches a preset upper limit. Then, the opening of the electronic expansion valve is increased based on the fifth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed.

[0212] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT are determined to meet the following control conditions: the outdoor ambient temperature Tw is between the fourth outdoor ambient temperature threshold Tw4 and the fifth outdoor ambient temperature threshold Tw5, and the temperature difference ΔT is between the third temperature difference threshold T3 and the fourth temperature difference threshold T4, a control mode corresponding to the control conditions currently met by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset lower frequency limit, the electronic expansion valve's opening is adjusted to a preset lower opening limit, and the outdoor fan's speed is adjusted to a preset upper speed limit. After a third preset running time, it is re-determined whether the temperature difference ΔT is still between the third temperature difference threshold T3 and the fourth temperature difference threshold T4. If so, the outdoor motor remains unchanged, and the electronic expansion valve is adjusted... The valve opening is the sum of the preset lower limit and the sixth preset step. The compressor's operating frequency is adjusted within the preset fifth compressor temperature range. Specifically, when the compressor casing temperature Tp is within the fifth compressor temperature range, the compressor's operating frequency is continuously increased until it reaches the preset upper limit. Then, while the compressor casing temperature Tp is still within the fifth compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the third temperature difference threshold T3 or above the fourth temperature difference threshold T4. At this point, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed (equivalent to returning to the previous state). Figure 5 or Figure 6 Step S14 is shown.

[0213] For example, assuming the pre-set fourth outdoor ambient temperature threshold Tw4 = 45℃, the fifth outdoor ambient temperature threshold Tw5 = 50℃, the third temperature difference threshold T3 = 1℃, the fourth temperature difference threshold T4 = 3℃, and the sixth preset number of steps = 80 steps: When 45℃≤Tw≤50℃ and 1℃≤ΔT<3℃ are met, adjust the compressor's operating frequency to the lower limit, adjust the electronic expansion valve's opening to the lower limit, and adjust the outdoor fan to high-speed operation. After running for 3 minutes, re-evaluate the temperature difference ΔT. If 1℃≤ΔT<3℃, the outdoor motor remains unchanged, and the electronic expansion valve is adjusted... The opening degree is the sum of the lower limit of the opening degree and 80 steps. Under the condition that 75℃≤Tp≤78℃, the operating frequency of the compressor is adjusted. ΔT is re-detected every 1 minute. When the operating frequency of the compressor reaches the upper limit of the frequency, the opening degree of the electronic expansion valve is further adjusted under the condition that 75℃≤Tp≤78℃, until ΔT<1℃ or ΔT≥3℃ is met. Then, the current control mode is exited, and the corresponding control mode is re-determined according to the outdoor ambient temperature Tw and the temperature difference ΔT, so as to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve and the speed of the outdoor fan.

[0214] As one optional embodiment, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, and further includes:

[0215] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a seventh preset step value, the speed of the outdoor fan is adjusted to a preset second speed value, and the opening of the electronic expansion valve is increased based on a preset seventh compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0216] Specifically, in conjunction with the above embodiments, the controller executes... Figure 5In step S16, when the outdoor ambient temperature Tw and temperature difference ΔT are determined to meet the following control conditions: the outdoor ambient temperature Tw is between the fourth outdoor ambient temperature threshold Tw4 and the fifth outdoor ambient temperature threshold Tw5, and the temperature difference ΔT is above the fourth temperature difference threshold T4, a control mode corresponding to the current control conditions met by the outdoor ambient temperature Tw and temperature difference ΔT is further determined. Based on the determined control mode, the compressor's operating frequency is adjusted to a preset upper frequency value, the electronic expansion valve's opening is adjusted to the sum of a preset lower opening value and a seventh preset step number, and the outdoor fan's speed is adjusted to a preset second speed value. Then, when the compressor's casing temperature Tp is within a preset seventh compressor temperature range, the opening of the electronic expansion valve is continuously increased until the temperature difference ΔT is determined to be below the fourth temperature difference threshold T4. At this point, the current control mode is exited, and a new control mode is determined based on the outdoor ambient temperature Tw and temperature difference ΔT to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed (equivalent to returning to the previous state). Figure 5 or Figure 6 Step S14 is shown.

[0217] It should be noted that the specific adjustment scheme for adjusting the opening degree of the electronic expansion valve when the compressor housing temperature Tp is within the seventh compressor temperature range can be designed according to different models of electronic expansion valves. Generally, the electronic control board will automatically adjust to a certain opening degree based on the compressor housing temperature Tp and the different manufacturers and models of electronic expansion valves. Alternatively, it can be set according to different capacity ranges and different models of electronic expansion valves. This embodiment of the invention does not impose specific limitations.

[0218] For example, assuming the preset fourth outdoor ambient temperature threshold Tw4 = 45℃, the fifth outdoor ambient temperature threshold Tw5 = 50℃, the fourth temperature difference threshold T4 = 3℃, and the seventh preset number of steps = 120 steps: when 45℃≤Tw≤50℃ and ΔT≥3℃ are met, adjust the compressor's operating frequency to the upper limit of the frequency, i.e., f = f0 - 25Hz, adjust the opening of the electronic expansion valve to the sum of the lower limit of the opening and 120 steps, and adjust the outdoor fan to medium-high speed operation. Then, when 87℃≤Tp≤90℃ are met, adjust the opening of the electronic expansion valve until ΔT<3℃ is met, exit the current control mode, and re-determine the corresponding control mode based on the outdoor ambient temperature Tw and the temperature difference ΔT, so as to readjust the compressor's operating frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0219] In other optional embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions, and further includes:

[0220] When the outdoor ambient temperature is above the fifth outdoor ambient temperature threshold, the compressor maintains its initial operating frequency, the indoor fan maintains its initial speed, and the outdoor fan maintains its initial speed. After a period of time, the outdoor ambient temperature Tw is detected and acquired in real time again through the first temperature sensor, and it is re-determined whether the currently detected outdoor ambient temperature Tw is above the fifth outdoor ambient temperature threshold. If so, it remains unchanged. This process continues until it is determined that the currently detected outdoor ambient temperature Tw is below the fifth outdoor ambient temperature threshold. At this point, the corresponding control mode can be determined based on the outdoor ambient temperature Tw and the temperature difference ΔT to adjust the compressor's operating frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0221] For example, assuming a pre-set fifth outdoor ambient temperature threshold Tw5 = 50℃, when Tw > 50℃, instead of using the various control modes described in the above embodiments to adjust the compressor's operating frequency, the opening of the electronic expansion valve, and the outdoor fan's speed, the compressor is controlled to maintain its initial operating frequency, the indoor fan maintains its initial speed, and the outdoor fan maintains its initial speed. Then, Tw can be detected and judged every 20 minutes. If Tw > 50℃ is still met, it remains unchanged until it is determined that Tw ≤ 50℃, at which point the protection is exited.

[0222] This invention also provides an air conditioner control method, see [link to relevant documentation]. Figure 11 The diagram shown is a flowchart illustrating an air conditioner control method according to an embodiment of the present invention. The method is applicable to any of the air conditioners described in the above embodiments. The method is executed by the controller and includes steps S101 to S103:

[0223] Step S101: After the air conditioner enters the cooling / dehumidification mode and runs for a period of time, the casing temperature of the compressor is obtained, and it is determined whether the casing temperature of the compressor meets the preset temperature conditions.

[0224] Step S102: When the casing temperature of the compressor meets the preset temperature conditions, acquire the outdoor ambient temperature, the indoor ambient temperature and the set target temperature, and determine whether the temperature difference between the outdoor ambient temperature and the indoor ambient temperature and the set target temperature meets the preset control conditions.

[0225] Step S103: When the outdoor ambient temperature and the temperature difference meet the preset control conditions, adjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions.

[0226] In some embodiments, determining whether the temperature difference between the outdoor ambient temperature and the indoor ambient temperature and the set target temperature meets a preset control condition specifically includes:

[0227] The outdoor ambient temperature is compared with preset first outdoor ambient temperature threshold, second outdoor ambient temperature threshold, third outdoor ambient temperature threshold, fourth outdoor ambient temperature threshold and fifth outdoor ambient temperature threshold;

[0228] The temperature difference between the indoor ambient temperature and the set target temperature is compared with preset first temperature difference threshold, second temperature difference threshold, third temperature difference threshold and fourth temperature difference threshold;

[0229] Then, when the outdoor ambient temperature and the temperature difference meet the preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions specifically includes:

[0230] When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset lower speed limit according to the determined control mode.

[0231] Furthermore, after a first preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the third temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0232] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0233] When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening degree value, and the speed of the outdoor fan is adjusted to a preset first speed value.

[0234] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset first compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the first compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

[0235] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0236] When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a first preset number of steps, the speed of the outdoor fan is adjusted to a preset first speed value, and the opening of the electronic expansion valve is increased based on a preset second compressor temperature range until the temperature difference is below the fourth temperature difference threshold. Then, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0237] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0238] When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset lower speed limit according to the determined control mode.

[0239] Furthermore, after a first preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the third temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0240] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0241] When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset first speed value.

[0242] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

[0243] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0244] When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a second preset number of steps, the speed of the outdoor fan is adjusted to a preset first speed value, and the opening of the electronic expansion valve is increased based on a preset third compressor temperature range until the temperature difference is below the fourth temperature difference threshold. Then, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0245] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0246] When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset first speed value according to the determined control mode.

[0247] Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and the control mode is redefined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0248] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0249] When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset first speed value.

[0250] Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

[0251] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0252] When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0253] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset fourth compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the fourth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0254] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0255] When the outdoor ambient temperature is between the second and third outdoor ambient temperature thresholds, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a third preset number of steps, the speed of the outdoor fan is adjusted to a preset second speed value, and the opening of the electronic expansion valve is increased based on a preset fifth compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0256] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0257] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0258] Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0259] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0260] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset second speed value according to the determined control mode.

[0261] Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0262] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0263] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset upper speed limit according to the determined control mode.

[0264] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the opening of the electronic expansion valve is adjusted to the sum of a preset lower limit and a fourth preset number of steps. The operating frequency of the compressor is increased based on a preset fifth compressor temperature range until the compressor's operating frequency reaches a preset upper limit. Then, the opening of the electronic expansion valve is increased based on the fifth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed.

[0265] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0266] When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a fifth preset step value, the speed of the outdoor fan is adjusted to a preset upper speed value, and the opening of the electronic expansion valve is increased based on a preset sixth compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0267] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0268] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0269] Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

[0270] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0271] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value.

[0272] Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset fourth compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the fourth compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0273] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0274] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset upper speed limit according to the determined control mode.

[0275] Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the opening of the electronic expansion valve is adjusted to the sum of a preset lower limit and a sixth preset number of steps. The operating frequency of the compressor is increased based on a preset fifth compressor temperature range until the compressor's operating frequency reaches a preset upper limit. Then, the opening of the electronic expansion valve is increased based on the fifth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed.

[0276] In some embodiments, when the outdoor ambient temperature and the temperature difference meet preset control conditions, adjusting the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control conditions further includes:

[0277] When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a seventh preset step value, the speed of the outdoor fan is adjusted to a preset second speed value, and the opening of the electronic expansion valve is increased based on a preset seventh compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0278] It should be noted that the air conditioner control method provided in this embodiment of the invention can realize all the working processes of the air conditioner described in any of the above embodiments. The specific implementation scheme and the technical effects achieved by the method are the same as the specific implementation scheme and the technical effects achieved by the air conditioner described in the above embodiments, and will not be repeated here.

[0279] In summary, the air conditioner and air conditioner control method provided by the embodiments of the present invention include an air conditioner comprising a refrigerant circuit in which refrigerant circulates sequentially through a compressor, a condenser, an electronic expansion valve, and an evaporator in a refrigeration cycle. One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger. The air conditioner also includes an outdoor fan for supplying air to the outdoor heat exchanger; a first temperature sensor for detecting the outdoor ambient temperature; a second temperature sensor for detecting the indoor ambient temperature; a third temperature sensor disposed on the compressor housing for detecting the compressor housing temperature; and a controller for: acquiring the compressor housing temperature after the air conditioner enters cooling / dehumidification mode and operates for a period of time, and determining whether the compressor housing temperature meets a preset temperature condition; acquiring the outdoor ambient temperature, the indoor ambient temperature, and a set target temperature when the compressor housing temperature meets the preset temperature condition, and determining whether the temperature difference between the outdoor ambient temperature, the indoor ambient temperature, and the set target temperature meets a preset control condition; and adjusting the compressor operating frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to a control mode corresponding to the met control condition when the outdoor ambient temperature and the temperature difference meet the preset control condition. By installing a temperature sensor on the compressor housing, the existing temperature sensor on the exhaust pipe can be moved to the compressor body. The temperature of the compressor housing is used instead of the exhaust pipe temperature, making the detected exhaust temperature more accurate. This allows for more precise adjustment of the compressor's operating frequency, effectively protecting the compressor and preventing demagnetization failure and burnout. It also provides more accurate protection for the entire unit's operation, improving the reliability of the air conditioning system. Furthermore, combined with effective control logic, the air conditioner can always operate in an optimal energy-efficient state, thus achieving greater energy savings and efficiency.

[0280] The above description is only some embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An air conditioner, characterized in that, The air conditioner includes: A refrigerant circuit in which the refrigerant circulates sequentially through a compressor, a condenser, an electronic expansion valve, and an evaporator in a refrigeration cycle, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger. An outdoor fan is used to supply air to the outdoor heat exchanger. The first temperature sensor is used to detect the outdoor ambient temperature; The second temperature sensor is used to detect the indoor ambient temperature; A third temperature sensor is installed on the housing of the compressor to detect the housing temperature of the compressor. Controller, used for: After the air conditioner enters the cooling / dehumidification mode and runs for a period of time, the casing temperature of the compressor is obtained, and it is determined whether the casing temperature of the compressor meets the preset temperature conditions. When the compressor casing temperature meets the preset temperature conditions, the outdoor ambient temperature, indoor ambient temperature and set target temperature are acquired, and it is determined whether the temperature difference between the outdoor ambient temperature and the indoor ambient temperature and the set target temperature meets the preset control conditions. When the outdoor ambient temperature and the temperature difference meet the preset control conditions, the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan are adjusted according to the control mode corresponding to the met control conditions. The controller determines whether the temperature difference between the outdoor ambient temperature and the indoor ambient temperature and the set target temperature meets preset control conditions, specifically including: The outdoor ambient temperature is compared with preset first outdoor ambient temperature threshold, second outdoor ambient temperature threshold, third outdoor ambient temperature threshold, fourth outdoor ambient temperature threshold and fifth outdoor ambient temperature threshold; The temperature difference between the indoor ambient temperature and the set target temperature is compared with preset first temperature difference threshold, second temperature difference threshold, third temperature difference threshold and fourth temperature difference threshold; Then, when the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions, specifically including: When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset lower speed limit according to the determined control mode. Furthermore, after a first preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the third temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

2. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening degree value, and the speed of the outdoor fan is adjusted to a preset first speed value. Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset first compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the first compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

3. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is below the first outdoor ambient temperature threshold and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a first preset number of steps, the speed of the outdoor fan is adjusted to a preset first speed value, and the opening of the electronic expansion valve is increased based on a preset second compressor temperature range until the temperature difference is below the fourth temperature difference threshold. Then, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

4. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset lower speed limit according to the determined control mode. Furthermore, after a first preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the third temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

5. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset first speed value. Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

6. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the first outdoor ambient temperature threshold and the second outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a second preset number of steps, the speed of the outdoor fan is adjusted to a preset first speed value, and the opening of the electronic expansion valve is increased based on a preset third compressor temperature range until the temperature difference is below the fourth temperature difference threshold. Then, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

7. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset first speed value according to the determined control mode. Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged, and after a second preset time period, the air conditioner is controlled to enter the oil return mode; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and the control mode is redefined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

8. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset first speed value. Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold, at which point the current control mode is exited. In the current control mode, if the compressor's operating frequency is below the oil return frequency for a continuous operating time exceeding a preset time threshold, the air conditioner is controlled to enter the oil return mode.

9. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the second outdoor ambient temperature threshold and the third outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value. Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the operating frequency of the compressor is increased based on a preset fourth compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the fourth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

10. The air conditioner as claimed in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the second and third outdoor ambient temperature thresholds, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a third preset number of steps, the speed of the outdoor fan is adjusted to a preset second speed value, and the opening of the electronic expansion valve is increased based on a preset fifth compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

11. The air conditioner as claimed in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value. Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

12. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset second speed value according to the determined control mode. Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset second compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the second compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

13. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset upper speed limit according to the determined control mode. Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the opening of the electronic expansion valve is adjusted to the sum of a preset lower limit and a fourth preset number of steps. The operating frequency of the compressor is increased based on a preset fifth compressor temperature range until the compressor's operating frequency reaches a preset upper limit. Then, the opening of the electronic expansion valve is increased based on the fifth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed.

14. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the third outdoor ambient temperature threshold and the fourth outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a fifth preset step value, the speed of the outdoor fan is adjusted to a preset upper speed value, and the opening of the electronic expansion valve is increased based on a preset sixth compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

15. The air conditioner as described in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the first temperature difference threshold and the second temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value. Furthermore, after a first preset time, if the temperature difference is still between the first temperature difference threshold and the second temperature difference threshold, the current control mode remains unchanged; if the temperature difference is above the second temperature difference threshold, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan.

16. The air conditioner as claimed in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the second temperature difference threshold and the third temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit value according to the determined control mode, the opening degree of the electronic expansion valve is adjusted to a preset lower opening limit value, and the speed of the outdoor fan is adjusted to a preset second speed value. Furthermore, after a third preset time, if the temperature difference is still between the second temperature difference threshold and the third temperature difference threshold, the operating frequency of the compressor is increased based on a preset fourth compressor temperature range until the operating frequency of the compressor reaches a preset upper frequency limit. Then, the opening of the electronic expansion valve is increased based on the fourth compressor temperature range until the temperature difference is below the second temperature difference threshold or above the third temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

17. The air conditioner as claimed in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is between the third temperature difference threshold and the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined, and the operating frequency of the compressor is adjusted to a preset lower frequency limit, the opening of the electronic expansion valve is adjusted to a preset lower opening limit, and the speed of the outdoor fan is adjusted to a preset upper speed limit according to the determined control mode. Furthermore, after a third preset time, if the temperature difference is still between the third temperature difference threshold and the fourth temperature difference threshold, the opening of the electronic expansion valve is adjusted to the sum of a preset lower limit and a sixth preset number of steps. The operating frequency of the compressor is increased based on a preset fifth compressor temperature range until the compressor's operating frequency reaches a preset upper limit. Then, the opening of the electronic expansion valve is increased based on the fifth compressor temperature range until the temperature difference is below the third temperature difference threshold or above the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the compressor's operating frequency, the electronic expansion valve's opening, and the outdoor fan's speed.

18. The air conditioner as claimed in claim 1, characterized in that, When the outdoor ambient temperature and the temperature difference meet preset control conditions, the controller adjusts the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan according to the control mode corresponding to the met control conditions. The controller also includes: When the outdoor ambient temperature is between the fourth outdoor ambient temperature threshold and the fifth outdoor ambient temperature threshold, and the temperature difference is above the fourth temperature difference threshold, a control mode corresponding to the currently satisfied control conditions is determined. Based on the determined control mode, the operating frequency of the compressor is adjusted to a preset upper frequency value, the opening of the electronic expansion valve is adjusted to the sum of a preset lower opening value and a seventh preset step value, the speed of the outdoor fan is adjusted to a preset second speed value, and the opening of the electronic expansion valve is increased based on a preset seventh compressor temperature range until the temperature difference is below the fourth temperature difference threshold. At this point, the current control mode is exited, and a new control mode is determined to readjust the operating frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan.

19. An air conditioner control method, characterized in that, Applicable to any air conditioner as described in any one of claims 1 to 18, the method is performed by the controller, the method comprising: After the air conditioner enters the cooling / dehumidification mode and runs for a period of time, the casing temperature of the compressor is obtained, and it is determined whether the casing temperature of the compressor meets the preset temperature conditions. When the compressor casing temperature meets the preset temperature conditions, the outdoor ambient temperature, indoor ambient temperature and set target temperature are acquired, and it is determined whether the temperature difference between the outdoor ambient temperature and the indoor ambient temperature and the set target temperature meets the preset control conditions. When the outdoor ambient temperature and the temperature difference meet the preset control conditions, the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan are adjusted according to the control mode corresponding to the met control conditions.

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