air conditioner

Abstract

This application discloses an air conditioner, including an indoor unit, an outdoor unit, a refrigeration system, a pressure detection device installed in the refrigeration system, a temperature detection device installed in the outdoor unit, an indoor controller installed in the indoor unit, and an outdoor controller installed in the outdoor unit. The indoor unit is configured to output a start-up signal to the outdoor controller when it detects that the indoor temperature meets the temperature control start-up conditions. The outdoor controller is configured to, upon receiving the start-up signal from the indoor controller, cause the air conditioner to enter a low-fan control mode. The compressor first operates at a first operating frequency, and the outdoor controller sends a low-frequency operating signal to the indoor controller to cause the indoor fan to operate at a first fan speed, wherein the first fan speed meets the low-fan speed range. Then, the operating frequency of the compressor is controlled according to the detected outdoor ambient temperature and a preset compressor control logic. When the difference between the refrigerant pressure and the target pressure value meets a preset exit condition, the air conditioner exits the low-fan control mode.

Description

Technical Field

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

[0002] Currently, in 24V communication air conditioners, the communication between the indoor and outdoor units is limited to switch signals and cannot use code signals, so the indoor unit cannot send parameters and operating status to the outdoor unit.

[0003] 24V communication air conditioners are generally only used in fixed-speed air conditioners, and can only operate at high fan speed throughout the entire operating cycle. This has the following disadvantages: First, when the compressor operates at a low frequency during startup, the high fan speed results in a higher indoor air outlet temperature, leading to poor cooling performance and reduced comfort. Second, because the indoor AHU (Air Handling Unit) operates with a single airflow, when the indoor unit is set to a certain temperature and the outdoor compressor is running at a low frequency, the indoor fan remains at high fan speed, reducing dehumidification capacity and causing discomfort in the room. These are the problems that 24V communication air conditioners urgently need to address.

[0004] In view of the above, this application is hereby submitted. Summary of the Invention

[0005] This application provides an air conditioner that adjusts the indoor fan speed and compressor frequency to achieve a preset temperature. By regulating the compressor's operating frequency, the air conditioner reduces the indoor fan speed when the compressor operates at a low frequency, thereby improving dehumidification and preventing low-temperature, high-humidity conditions, thus increasing indoor room comfort. This solves the technical problems of American-style air conditioners, such as their inability to operate at low fan speeds, poor dehumidification, and large temperature fluctuations leading to poor comfort.

[0006] Therefore, this application provides an air conditioner, comprising:

[0007] The indoor unit contains an indoor fan, which is used to deliver air conditioning air into the room;

[0008] Outdoor unit;

[0009] A refrigeration system, including a refrigerant circuit, which includes an indoor heat exchanger in the indoor unit, an expansion valve in the indoor or outdoor unit, a compressor in the outdoor unit, a four-way valve in the outdoor unit, and an outdoor heat exchanger in the outdoor unit.

[0010] The pressure detection device is located in the refrigeration system and on the pipe near the indoor heat exchanger of the four-way valve. It is used to detect the refrigerant pressure of the indoor heat exchanger.

[0011] A temperature detection device, located in the outdoor unit, is used to detect the outdoor ambient temperature to adjust the compressor's operating frequency.

[0012] The indoor controller, located in the indoor unit, is configured to output a start-up signal to the outdoor controller when the indoor temperature is detected to meet the temperature control start-up conditions;

[0013] The outdoor controller, located in the outdoor unit, is configured such that when it receives the start-up signal from the indoor controller, the air conditioner enters a low-speed control mode. The compressor first runs at a first operating frequency, and the outdoor controller sends a low-frequency operating signal to the indoor controller via a 24V signal line to make the indoor fan run at a first speed to reduce the output of indoor air volume. The first speed meets the low-speed range.

[0014] Based on the detected outdoor ambient temperature, the compressor's operating frequency is adjusted to the preset compressor frequency according to the preset compressor control logic, so as to change the refrigerant temperature by adjusting the refrigerant pressure.

[0015] When the difference between the refrigerant pressure and the target pressure value meets the preset exit conditions, the air conditioner exits the low fan speed control mode.

[0016] In this application, the principle of adjusting indoor temperature by the compressor's operating frequency and refrigerant pressure is as follows: the refrigerant temperature of the indoor heat exchanger can be calculated based on the refrigerant pressure, and the refrigerant temperature can be changed by controlling the compressor's operating frequency to adjust the refrigerant pressure, thereby controlling the indoor temperature.

[0017] In some embodiments of this application, the preset compressor control logic includes:

[0018] When the outdoor ambient temperature meets the first preset temperature condition, the compressor operates at the first preset compressor frequency, which is obtained based on the rated operating frequency and the first preset percentage.

[0019] When the outdoor ambient temperature meets the second preset temperature condition, the compressor operates at the second preset compressor frequency, which is obtained based on the rated operating frequency and the second preset percentage.

[0020] When the outdoor ambient temperature meets the third preset temperature condition, the third preset compressor frequency of the compressor is determined based on the outdoor ambient temperature value according to the first preset frequency-temperature relationship. The first preset frequency-temperature relationship is a functional relationship between the ratio of the rated operating frequency and the outdoor ambient temperature.

[0021] In some embodiments of this application, during the low-fan control mode of the air conditioner, after the outdoor ambient temperature is determined for the first time, the outdoor controller no longer determines the change in the outdoor ambient temperature.

[0022] In some embodiments of this application, after the air conditioner exits the low-wind control mode, it enters the free operation mode. The outdoor controller does not send a low-frequency operation signal to the indoor controller, and the indoor fan operates at a second wind speed, wherein the second wind speed meets the high wind speed range.

[0023] The compressor's operating frequency gradually increases to the second operating frequency.

[0024] In some embodiments of this application, after the air conditioner operates in free operation mode, it enters stable operation mode and adjusts the operating frequency of the compressor so that the difference between the refrigerant pressure and the preset target pressure reaches the upper limit of the first pressure range.

[0025] In some embodiments of this application, during the stable operation mode of the air conditioner, when the outdoor ambient temperature reaches the fourth preset temperature condition and the difference between the refrigerant pressure and the preset target pressure reaches the upper limit of the first pressure range, the outdoor controller sends a low-frequency operation signal to the indoor controller, and the indoor fan operates at the first wind speed.

[0026] In some embodiments of this application, during the stable operation mode of the air conditioner, when the outdoor ambient temperature reaches the fourth preset temperature condition and the difference between the refrigerant pressure and the preset target pressure reaches the upper limit of the first pressure range, the third operating frequency of the compressor is determined according to the outdoor ambient temperature based on the second preset frequency-temperature relationship, wherein the second preset frequency-temperature relationship is a functional relationship between the proportion of the rated operating frequency and the outdoor ambient temperature.

[0027] In some embodiments of this application, during the stable operation mode of the air conditioner, when the outdoor ambient temperature reaches the fifth preset temperature condition, the outdoor controller does not send a low-frequency operation signal to the indoor controller.

[0028] In some embodiments of this application, during the stable operation mode of the air conditioner, when the compressor's operating frequency is adjusted to the corresponding third operating frequency, if the outdoor ambient temperature always reaches the fourth preset temperature condition, and the difference between the refrigerant pressure and the preset target pressure always reaches the upper limit of the first pressure range, the indoor fan always runs at the first wind speed, the compressor's operating frequency remains unchanged, and it is not forcibly shut down.

[0029] In some embodiments of this application, during the free operation mode of the air conditioner, the air conditioner exits the mode after the operating time of the free operation mode reaches a first preset operating time.

[0030] In the above embodiments, the air conditioner proposed in this application includes an indoor unit, an outdoor unit, a refrigeration system, a pressure detection device installed in the refrigeration system, a temperature detection device installed in the outdoor unit, an indoor controller installed in the indoor unit, and an outdoor controller installed in the outdoor unit. The indoor unit is configured to output a start-up signal to the outdoor controller when it detects that the indoor temperature meets the temperature control start-up conditions. The outdoor controller is configured to, upon receiving the start-up signal from the indoor controller, cause the air conditioner to enter a low-speed control mode. The compressor first operates at a first operating frequency, and the outdoor controller sends a low-frequency operating signal to the indoor controller via a 24V signal line to cause the indoor fan to operate at a first fan speed, thereby reducing the output of indoor air volume. The first fan speed meets the low-speed range. Then, based on the detected outdoor ambient temperature, the operating frequency of the compressor is controlled according to a preset compressor control logic to change the refrigerant temperature by adjusting the refrigerant pressure. When the difference between the refrigerant pressure and the target pressure value meets a preset exit condition, the air conditioner exits the low-speed control mode. By controlling the compressor's operating frequency and the indoor fan's speed during the air conditioner's startup phase, the compressor operates at a low frequency, reducing the indoor fan's speed, thus improving dehumidification levels, preventing low temperature and high humidity, and enhancing the comfort of the indoor room. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a refrigerant flow diagram of an air conditioner under cooling conditions, provided according to an exemplary embodiment.

[0033] Figure 2 This is a refrigerant flow diagram of an air conditioner in heating mode according to an exemplary embodiment.

[0034] Figure 3 A hardware configuration block diagram of an air conditioner provided according to an exemplary embodiment;

[0035] Figure 4 This is a schematic diagram of the installation of the pressure detection device provided in accordance with an exemplary embodiment of this application;

[0036] Figure 5 This is a schematic diagram of the signal transmission of the indoor unit, outdoor unit, and thermostat provided in accordance with an exemplary embodiment of this application;

[0037] Figure 6 This application provides control logic for the start-up phase of an air conditioner according to an exemplary embodiment.

[0038] Figure 7 This application provides a compressor frequency curve for the start-up phase of an air conditioner according to an exemplary embodiment.

[0039] Figure 8 This is a flowchart of the preset compressor control logic provided in this application according to an exemplary embodiment;

[0040] Figure 9 This application provides control logic for the free-running mode of an air conditioner according to an exemplary embodiment.

[0041] Figure 10 This application provides control logic for the stable operation mode of an air conditioner according to an exemplary embodiment.

[0042] Figure 11 The compressor frequency curve of the air conditioner in stable operation mode provided in this application according to an exemplary embodiment;

[0043] Figure 12 This is a control timing diagram of the indoor fan and compressor of the air conditioner after it is turned on, according to an exemplary embodiment of this application;

[0044] Figure 13 This application provides the control logic for an air conditioner according to an exemplary embodiment.

[0045] Figure 14 This is another control logic for the air conditioner provided in this application according to an exemplary embodiment;

[0046] Figure 15 The operating monitoring curve of the air conditioner after using the control logic proposed in this application;

[0047] In the above figures:

[0048] Air conditioner 100; Indoor unit 1; Outdoor unit 2; Indoor controller 11; Outdoor controller 21;

[0049] Indoor heat exchanger 12; Outdoor heat exchanger 22; Electronic expansion valve 23; Check valve 24;

[0050] 13. Thermal expansion valve; 25. Four-way valve; 26. Compressor; 14. Indoor fan;

[0051] Temperature detection device 31; pressure detection device 33; temperature controller 4. Detailed Implementation

[0052] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0053] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0054] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0055] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] This application provides an air conditioner 100, with reference to... Figure 1-4 The air conditioner 100 includes an indoor unit 1, an outdoor unit 2, and a refrigeration system. The indoor unit 1 is installed indoors and is used to exchange heat with the indoor environment. The outdoor unit 2 is usually installed outdoors and is used to carry the heat from the indoor environment to the outdoor environment.

[0057] The indoor unit 1 includes an indoor fan 14 and an indoor heat exchanger 12. The indoor fan 14 is used to detect when the air conditioner is delivered to the room, and the indoor heat exchanger 12 is used to perform heat exchange between the refrigerant and the indoor air.

[0058] The outdoor unit 2 includes a compressor 26, a four-way valve 25, and an outdoor heat exchanger 22. The compressor 26 is used to provide high-temperature and high-pressure refrigerant gas; the four-way valve 25 is used to switch the flow path of the refrigerant; and the outdoor heat exchanger 22 is used to perform heat exchange between the refrigerant and the outdoor air.

[0059] The air conditioner 100 also includes an expansion valve disposed in the indoor unit 1 or the outdoor unit 2, the expansion valve being used for throttling in cooling or heating mode.

[0060] Specifically, the expansion valve may include an electronic expansion valve 23 and a thermostatic expansion valve 13. The electronic expansion valve 23 is installed in the outdoor unit 2 and is used for throttling in heating mode to control the refrigerant flow rate in the pipeline between the indoor heat exchanger 12 and the outdoor heat exchanger 22. The thermostatic expansion valve 13 is installed in the indoor unit 1 and is used for throttling in cooling mode to control the refrigerant flow rate in the pipeline between the indoor heat exchanger 12 and the outdoor heat exchanger 22.

[0061] The refrigeration system includes a refrigerant circuit, which allows for indoor cooling or heating cycles by circulating the refrigerant within the circuit. Connecting pipes are used to connect the indoor unit 1 and the outdoor unit 2 to form a refrigerant circuit for refrigerant circulation.

[0062] The air conditioner 100 in this application executes a cooling / heating cycle using a refrigerant circuit consisting of a compressor 26, a four-way valve 25, an outdoor heat exchanger 22, an electronic expansion valve 23, a thermostatic expansion valve 13, and an indoor heat exchanger 12. The cooling cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the regulated and heat-exchanged air. The compressor 26 establishes the high-pressure and low-pressure states required for the refrigerant to operate. Through heat exchange with the outdoor air, it releases heat from the indoor air to the outdoor air (cooling mode) or absorbs heat from the outdoor air to replenish the indoor air (heating mode).

[0063] Compression process: Compressor 26 compresses the refrigerant gas under high temperature and high pressure and discharges the compressed refrigerant gas. Compressor 26 can be a variable capacity inverter compressor 26 with inverter-based speed control. The refrigerant gas discharged from compressor 26 flows into the condenser.

[0064] Condensation process: The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0065] Expansion process: Refer to Figure 1 In refrigeration mode, the thermostatic expansion valve 13 causes the high-temperature, high-pressure liquid refrigerant condensed in the condenser to expand into a low-pressure liquid refrigerant. (Refer to...) Figure 2 In heating mode, the electronic expansion valve 23 expands the high-temperature, high-pressure liquid refrigerant in the condenser to the low-pressure liquid refrigerant.

[0066] Evaporation process: The evaporator evaporates the refrigerant that expands in the throttling device, and returns the refrigerant gas at a low temperature and low pressure to the compressor 26. The evaporator achieves a cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material to be cooled. Throughout the cycle, the air conditioner 100 can regulate the temperature of the indoor space.

[0067] In cooling mode, indoor heat exchanger 12 is the evaporator, and outdoor heat exchanger 22 is the condenser. In heating mode, indoor heat exchanger 12 is the condenser, and outdoor heat exchanger 22 is the evaporator.

[0068] In some embodiments of this application, reference is made to Figure 1-2 The refrigeration system also includes a one-way valve 24, the two ends of which are connected in parallel to the two ends of the electronic expansion valve 23. This allows the refrigerant passing through this point to pass through the one-way valve 24 instead of the electronic expansion valve 23 when the electronic expansion valve 23 is not required to throttle, thereby reducing the pressure loss of the refrigerant in the refrigerant circuit.

[0069] Specifically, during the cooling mode using outdoor unit 2, the electronic expansion valve 23 is fully open, and the one-way valve 24 is forward-guided to reduce the pressure loss of the refrigerant in the refrigerant circuit caused by the electronic expansion valve 23.

[0070] Figure 3 This is a hardware configuration block diagram of an air conditioner 100 according to an exemplary embodiment of this application. (Refer to...) Figure 3 The air conditioner 100 also includes one or more of the following: a pressure detection device 33, a temperature detection device 31, an indoor controller 11, and an outdoor controller 21. Furthermore, the pressure detection device 33 and the temperature detection device 31 are communicatively connected to the outdoor controller 21. Only switching signals can be transmitted between the indoor controller 11 and the outdoor controller 21, preventing the outdoor unit 2 from obtaining the refrigerant temperature and pressure of the indoor heat exchanger 12 of the indoor unit 1 through communication with the indoor unit 1.

[0071] In some embodiments of this example, for the pressure detection device 33, refer to Figure 4 The pressure detection device 33 is installed on the outdoor unit 2, specifically within the refrigeration system and on the pipe near the indoor heat exchanger 12 of the four-way valve 25, to detect the pressure value at the installation location. Since the pressure value at this location is approximately the same as the refrigerant pressure of the indoor heat exchanger 12, in this application, the pressure value at this location is defined as the refrigerant pressure of the indoor heat exchanger 12. The pressure detection device 33 is used to detect the refrigerant pressure and send the detected refrigerant pressure to the outdoor controller 21. For example, the pressure detection device 33 is configured as a pressure sensor.

[0072] This application can determine the load demand of the indoor room by detecting the refrigerant pressure of the indoor heat exchanger 12 through the pressure detection device 33 located in the refrigeration system, so as to adjust the overall operation of the air conditioner 100. For example, the frequency of the compressor 26, the opening of the expansion valve, and the speed of the outdoor fan can be adjusted.

[0073] It should be noted that the pressure sensor in this embodiment has a detection accuracy of 0.001 MPa, and the detection result is more accurate than that of the inner plate temperature detection. Therefore, controlling the operation of the outdoor unit 2 by pressure is accurate and reliable.

[0074] In some embodiments of this example, the temperature detection device 31 is installed on the outdoor unit 2 to detect the outdoor ambient temperature and send the detected outdoor ambient temperature to the outdoor controller 21.

[0075] Those skilled in the art will understand that Figure 3 The hardware structure shown does not constitute a limitation on the air conditioner 100. The air conditioner 100 may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0076] In this embodiment, the indoor controller 11 may include a wired controller. For example, a 24V universal wired controller is used. In this embodiment, the air conditioner 100 can switch the indoor unit 1 and outdoor unit 2 on and off using the wired controller. However, since the wired controller only provides a 24V AC signal and does not have a communication protocol for signal interaction between the indoor unit 1 and outdoor unit 2 of the air conditioner 100, the wired controller cannot directly control the outdoor unit 2. For example, it cannot directly query the operating status of the indoor unit 1 from the outdoor unit 2, or directly control the operating status of the outdoor unit 2.

[0077] The wired controller can generate operation control signals based on the instruction operation code and timing signal, instructing the air conditioner 100100 to execute control commands.

[0078] Reference Figure 5 Taking an air conditioner 100 that is turned on via thermostat 4 as an example, this paper illustrates the signal transmission diagram of thermostat 4, indoor unit 1 and outdoor unit 2.

[0079] Thermostat 4 sends a start signal to outdoor unit 2 to turn on air conditioner 100 and switch between cooling and heating modes. In cooling mode, the start signal is compressor signal Y and four-way valve signal B. In heating mode, the start signal is compressor signal Y.

[0080] Outdoor unit 2 can send a low-frequency operation signal to indoor unit 1 so that indoor fan 14 operates at a set low-frequency speed.

[0081] Outdoor unit 2 can also send defrost signals to indoor unit 1 and thermostat 4.

[0082] Indoor unit 1, outdoor unit 2 and thermostat 4 can send reference signals to assist the normal operation of air conditioner 100.

[0083] In some embodiments of this example, the outdoor controller 21 detects the outdoor ambient temperature to determine the outdoor heat exchange effect, and combines the refrigerant pressure detected by the pressure detection device 33 to obtain the refrigerant temperature of the indoor heat exchanger 12, and determines whether it is necessary to enter the low-wind control mode, so as to avoid the mismatch between the operating frequency of the compressor 26 and the operating speed of the indoor fan 14, which would result in low temperature and high humidity in the air outlet of the air conditioner 100, thereby improving the comfort of indoor air blowing.

[0084] In some embodiments of this example, the outdoor controller 21 can be used to control the operating frequency of the compressor 26 to adjust the pressure value in the refrigerant circuit of the air conditioner 100, thereby realizing various preset functions of the air conditioner 100.

[0085] The indoor controller 11 can be used to control the operation of the indoor fan 14 so that the air outlet temperature is not too high and the cooling effect is poor during the initial stage of the air conditioner 100 startup, and low temperature and high humidity are avoided during the stable operation stage, thereby improving the dehumidification level and increasing the comfort of the room.

[0086] In some embodiments of this example, the air conditioner 100 is also equipped with a remote control, which has the function of communicating with the indoor controller 11, for example, using infrared or other communication methods. The remote control is used by the user to perform various controls on the air conditioner 100, realizing interaction between the user and the air conditioner 100.

[0087] In some embodiments of this example, the indoor controller 11 is configured to output a start-up signal to the outdoor controller 21 when it detects that the indoor temperature meets the temperature control start-up conditions. The outdoor controller 21 is configured to, upon receiving the start-up signal from the indoor controller 11, control the air conditioner 100 to enter a low-speed control mode. The compressor 26 initially operates at a first operating frequency. The outdoor controller 21 sends a low-frequency operating signal to the indoor controller 11 via a 24V signal line, causing the indoor fan 14 to operate at a first fan speed. This reduces the output of indoor airflow and prevents the indoor fan 14 from running too fast during the initial low-frequency start-up of the compressor 26, which would result in a high indoor air outlet temperature, poor cooling effect, and poor comfort. It should be noted that the first fan speed falls within the low-speed range.

[0088] It is understood that the low wind speed range is defined relative to the entire operating speed range of the indoor fan 14, and similarly, the high wind speed range described below is also defined relative to the entire operating speed range of the indoor fan 14. In some embodiments, the entire operating speed range of the indoor fan 14 can also be divided into a low wind speed range, a medium wind speed range, and a high wind speed range to adjust the output air volume and wind speed of the air conditioner 100.

[0089] Then, based on the detected outdoor ambient temperature, the operating frequency of compressor 26 is increased to the preset compressor 26 frequency according to the preset compressor control logic, so as to change the refrigerant temperature by adjusting the refrigerant pressure.

[0090] When the difference between the refrigerant pressure and the target pressure value meets the preset exit condition, it is determined that the refrigerant pressure is close to the target pressure value, and the air conditioner exits the low fan speed control mode. It should be noted that the preset exit condition is set to the upper limit of the first pressure range where the difference between the refrigerant pressure and the target pressure value reaches this limit. When the preset exit condition is met, it is determined that the refrigerant pressure is close to the target pressure value.

[0091] It should be noted that in some embodiments, the first operating frequency is set to the low-frequency operating frequency of the compressor 26, the preset compressor 26 frequency is the target operating frequency of the compressor 26 during the start-up phase, and the preset compressor 26 frequency is greater than the first operating frequency.

[0092] In this embodiment, the basic control logic of compressor 26 is as follows: When outdoor unit 2 receives a 24V start-up signal, the frequency of compressor 26 is controlled by controlling the target pressure value. In cooling mode, if the current refrigerant pressure is higher than the target pressure value, the operating frequency of compressor 26 needs to be increased; conversely, if it is lower, the operating frequency of compressor 26 needs to be decreased. In heating mode, if the current refrigerant pressure is higher than the target pressure value, the operating frequency of compressor 26 needs to be decreased; conversely, if it is lower, the operating frequency of compressor 26 needs to be decreased.

[0093] Reference Figure 6 This explains the control logic during the air conditioner's 100% startup phase.

[0094] Determine whether the indoor controller 11 has detected that the indoor temperature meets the temperature control start-up conditions (step S601);

[0095] In step S601, if the indoor controller 11 detects that the indoor temperature meets the temperature control start-up conditions, then step S602 is executed, and the indoor controller 11 sends a start-up signal to the outdoor controller 21; then after the outdoor controller 21 receives the cooling start-up signal sent by the indoor controller 11, the air conditioner 100 enters the low fan control mode (step S603).

[0096] It should be noted that the cooling start signal includes compressor signal Y (26) and four-way valve signal B (25), while the heating start signal includes compressor signal Y (26).

[0097] The compressor 26 operates at a first operating frequency (step S604); the outdoor controller 21 sends a low-frequency operating signal to the indoor controller 11 via a 24V signal line to make the indoor fan 14 operate at a first wind speed (step S605) to reduce the output of indoor air volume, wherein the first wind speed meets the low wind speed range.

[0098] Based on the detected outdoor ambient temperature, the operating frequency of compressor 26 is increased to the preset compressor 26 frequency according to the preset compressor control logic (step S606), thereby changing the refrigerant temperature by adjusting the refrigerant pressure. It should be noted that the preset compressor 26 frequency is greater than the first operating frequency.

[0099] Determine whether the difference between the refrigerant pressure and the target pressure value meets the preset exit conditions (step S607);

[0100] In step S607, if the difference between the refrigerant pressure and the target pressure value meets the preset exit condition, then step S608 is executed, and the air conditioner 100 exits the low fan control mode.

[0101] In step S607, if the difference between the refrigerant pressure and the target pressure value does not meet the preset exit condition, then step S607 continues to be executed.

[0102] In step S601, if the indoor controller 11 does not detect that the indoor temperature meets the temperature control start-up conditions, then step S601 continues to be executed.

[0103] In this embodiment, during the operation of the air conditioner 100 in low fan speed control mode, after the outdoor controller 21 controls the operating frequency of the compressor 26 based on the outdoor ambient temperature for the first time, it no longer judges the change in outdoor ambient temperature.

[0104] During the initial startup of the cooling system, the operating frequency of the compressor 26 gradually increases. At this time, the cooling system is in an unstable phase with low cooling capacity output, necessitating a reduction in indoor airflow. In this application, a low-frequency operating signal is sent from the outdoor controller 21 to the indoor controller 11 to control the indoor fan 14 to operate in a set low-frequency mode. Simultaneously, the compressor 26 is also set to operate in a low-frequency mode, coordinating the operating states of the compressor 26 and the indoor fan 14 to reduce the indoor airflow and lower the outlet air temperature. This prevents the air conditioner 100 from blowing out low-temperature, high-humidity air, improving indoor comfort. Furthermore, the operating frequency of the compressor 26 is adjusted based on the outdoor ambient temperature, addressing technical issues such as the inability of the American-style air conditioner 100 to operate at low speed, poor dehumidification, and large room temperature fluctuations leading to poor comfort.

[0105] In some embodiments of this example, the preset compressor control logic includes: when the outdoor ambient temperature meets a first preset temperature condition, the compressor 26 operates at a first preset compressor 26 frequency, wherein the first preset compressor 26 frequency is obtained based on the rated operating frequency and a first preset percentage; when the outdoor ambient temperature meets a second preset temperature condition, the compressor 26 operates at a second preset compressor 26 frequency, wherein the second preset compressor 26 frequency is obtained based on the rated operating frequency and a second preset percentage; when the outdoor ambient temperature meets a third preset temperature condition, the third preset compressor 26 frequency is determined based on the outdoor ambient temperature value according to the first preset frequency-temperature relationship. It should be noted that the first preset frequency relationship is a functional relationship between the percentage of the rated operating frequency and the outdoor ambient temperature.

[0106] For example, the first preset temperature condition is set to less than 10°C, the second preset temperature condition is set to greater than 30°C, and the third preset temperature condition is set to greater than 10°C and less than 30°C. The first preset percentage is 30%, and the second preset percentage is 70%.

[0107] Specifically, refer to Figure 7 The rated operating frequency of compressor 26 is set to X. When the outdoor ambient temperature is less than 10℃, the first preset percentage is 30%, and compressor 26 operates at 30%X.

[0108] When the indoor ambient temperature T is between 10℃ and 30℃, the frequency ratio of the rated operating condition of the compressor 26 in the first preset frequency relationship has an exponential relationship with the outdoor ambient temperature. The frequency ratio of the rated operating condition is obtained by looking up the graph or by calculation based on the detected outdoor ambient temperature, and then the operating power of the compressor 26 is obtained to adjust the working state of the compressor 26.

[0109] When the outdoor ambient temperature is greater than 30°C, the second preset percentage is 75%, and the compressor 26 operates at 75%X.

[0110] Reference Figure 8 This is a flowchart illustrating the preset compressor control logic.

[0111] Determine whether the outdoor ambient temperature is greater than 30℃ (step S801);

[0112] In step S801, if the outdoor ambient temperature is greater than 30°C, then step S802 is executed, and compressor 26 operates at an operating frequency of 75%X.

[0113] In step S801, if the outdoor ambient temperature is not greater than 30°C, then step S803 is executed to determine whether the outdoor ambient temperature is greater than 10°C.

[0114] In step S803, if the outdoor ambient temperature is greater than 10°C, then step S804 is executed to obtain the operating frequency of the compressor 26 based on the relationship between the outdoor ambient temperature and the first preset frequency.

[0115] In step S803, if the outdoor ambient temperature is not greater than 10°C, then step S805 is executed, and the compressor 26 operates at a frequency of 30%X.

[0116] In some embodiments of this example, after exiting the low-fan control mode, the air conditioner 100 enters a free-running mode. The outdoor controller 21 does not send a low-frequency operating signal to the indoor controller 11, and the indoor fan 14 operates at a second fan speed, wherein the second fan speed meets the high fan speed range; the operating frequency of the compressor 26 gradually increases to the second operating frequency. For example, the second operating frequency is set to the frequency under rated operating conditions.

[0117] Reference Figure 9 After exiting the low-speed control mode, the air conditioner 100 enters the free-running mode (step S901). The outdoor controller 21 does not send a low-frequency operation signal to the indoor controller 11, and the indoor fan 14 runs at the second fan speed (step S902), wherein the second fan speed meets the high fan speed range; the operating frequency of the compressor 26 gradually increases to the second operating frequency (step S903); it is determined whether the free-running mode operation time has reached 30 minutes (step S904).

[0118] In step S904, if the free-running mode runs for 30 minutes, then step S905 is executed to exit the free-running mode.

[0119] In step S904, if the free run mode running time has not reached 30 minutes, then S904 is executed.

[0120] In some embodiments of this example, after the air conditioner 100 operates in free operation mode, it enters stable operation mode. The compressor 26 remains on and the operating frequency of the compressor 26 is adjusted so that the refrigerant is far from the upper limit of the first pressure range where the difference between the refrigerant and the preset target pressure is reached.

[0121] In some embodiments of this example, during the stable operation mode of the air conditioner 100, when the outdoor ambient temperature reaches the fourth preset temperature condition, it is determined that the outdoor temperature is within the low-frequency operating range, and the difference between the refrigerant pressure and the preset target pressure reaches the upper limit of the first pressure range, indicating that the refrigerant pressure is close to the preset target pressure. The outdoor controller 21 then sends a low-frequency operating signal to the indoor controller 11 to cause the indoor fan 14 to operate at the first fan speed, reducing the output of indoor airflow. For example, the temperature range of the fourth preset temperature condition is set to (10, 45).

[0122] With the above settings, when the outdoor temperature meets the low-frequency operation conditions and the refrigerant pressure is close to the target pressure value, the indoor fan 14 of the indoor unit 1 operates at low speed, reducing the indoor air volume and increasing the indoor dehumidification capacity.

[0123] In some embodiments of this example, during the stable operation mode of the air conditioner 100, when the outdoor ambient temperature reaches the fourth preset temperature condition and the difference between the refrigerant pressure and the preset target pressure reaches the first pressure range, the third operating frequency of the compressor 26 is determined according to the outdoor ambient temperature based on the second preset frequency-temperature relationship, wherein the second preset frequency-temperature relationship is a functional relationship between the frequency ratio of the rated operating condition and the outdoor ambient temperature.

[0124] As described above, when the refrigerant pressure approaches the preset target pressure, the operating frequency of the compressor 26 is calculated to reach the preset value. This, in conjunction with the indoor fan 14, reduces the air volume of the indoor fan 14, lowers the outlet air temperature, increases the dehumidification capacity of the indoor unit 1, and improves the comfort of the indoor air outlet.

[0125] In some embodiments of this example, during the stable operation mode of the air conditioner 100, when the outdoor ambient temperature reaches a fifth preset temperature condition, the outdoor controller 21 does not send a low-frequency operation signal to the indoor controller 11. For example, the fifth preset temperature condition includes greater than or equal to 45°C and / or less than or equal to 10°C.

[0126] Reference Figure 10 This explains the control logic for the stable operation mode.

[0127] Air conditioner 100 operates in stable mode (step S1001);

[0128] Determine whether the outdoor ambient temperature is less than 45℃ (step S1002);

[0129] In step S1002, if the outdoor ambient temperature is not less than 45°C, it is determined that the outdoor heat exchange efficiency is poor at this time, and the compressor 26 needs to exert the maximum heating capacity. At this time, the indoor unit does not need to run at low fan speed. Then, step S1006 is executed, and the outdoor controller 21 does not send a low-frequency operation signal to the indoor controller 11.

[0130] In step S1002, if the outdoor ambient temperature is less than 45°C, then step S1003 is executed to determine whether the outdoor ambient temperature is greater than 10°C.

[0131] In step S1003, if the outdoor ambient temperature is greater than 10°C, then step S1004 is executed to determine whether the difference between the refrigerant pressure and the preset target pressure reaches the upper limit of the first pressure range.

[0132] In step S1004, if the difference between the refrigerant pressure and the preset target pressure reaches the upper limit of the first pressure range, then step S1005 is executed, and the outdoor controller 21 sends a low-frequency operation signal to the indoor controller 11, and the indoor fan 14 operates at low speed to increase the indoor dehumidification capacity.

[0133] In step S1003, if the outdoor ambient temperature is not greater than 10℃, it is determined that the outdoor heat exchange efficiency is high. In order to prevent the indoor freezing phenomenon, the indoor low fan does not need to be operated. Therefore, step S1006 is executed.

[0134] Reference Figure 11 When the outdoor ambient temperature is greater than 45℃, the operating frequency of compressor 26 is 65%X; when the outdoor ambient temperature is between 15℃ and 45℃, the operating frequency of compressor 26 is obtained based on the rated operating frequency under rated conditions and the frequency percentage, wherein the frequency percentage is based on... Figure 10 When the outdoor ambient temperature is less than 15℃, the operating frequency of compressor 26 is 35%X.

[0135] In some embodiments of this example, if the outdoor ambient temperature always reaches the fourth preset temperature condition and the difference between the refrigerant pressure and the preset target pressure always reaches the first pressure range during the operation of the indoor fan 14 at the first wind speed, the indoor fan 14 will always operate at the first wind speed and will not be forcibly shut down.

[0136] Reference Figure 12 The control timing diagram of indoor fan 14 and compressor 26 after air conditioner 100 is turned on.

[0137] During the stable operation mode of the air conditioner 100, when the operating frequency of the compressor 26 is adjusted to the corresponding third operating frequency, if the outdoor ambient temperature always reaches the fourth preset temperature condition, and the difference between the refrigerant pressure and the preset target pressure always reaches the upper limit of the first pressure range, the indoor fan 14 always runs at the first wind speed, the operating frequency of the compressor 26 remains unchanged, and it is not forced to exit.

[0138] It is understood that the above situations do not include the case of forcibly shutting off the air conditioner at 100%.

[0139] In some embodiments of this example, during the operation of the air conditioner 100 in free operation mode, the air conditioner 100 exits the mode after the operating time in free operation mode reaches a first preset operating time. For example, the first preset operating time is 30 minutes.

[0140] In some embodiments of this example, the low-wind control mode runs for 10-30 minutes. During the operation of the air conditioner 100, after the low-wind control mode has been running for 10 minutes, it is determined whether the refrigerant pressure has reached the target pressure value. If the refrigerant pressure has reached the target pressure value, the low-wind control mode is exited. If the refrigerant pressure has not reached the target pressure value, the mode is exited after the low-wind control mode has been running for 30 minutes.

[0141] Specifically, refer to Figure 13 This section explains the control logic of the air conditioner 100 in this embodiment.

[0142] The indoor controller 11 sends a cooling start signal (step S1301) and determines whether the outdoor ambient temperature is within the low-frequency operating range (step S1302).

[0143] In step S1302, if the outdoor ambient temperature is within the low-frequency operating range, then step S1303 is executed, the operating frequency of the compressor 26 is calculated based on the outdoor ambient temperature, and a low-frequency operating signal is sent to the indoor controller 11; it is then determined whether the operating time of the low-wind operation mode has reached 10 minutes (step S1304).

[0144] In step S1304, if the running time of the low-wind operation mode reaches 10 minutes, then step S1305 is executed to determine whether the condensing pressure is close to the target pressure value.

[0145] In step S1305, if the condensing pressure is close to the target pressure value, then step S1308 is executed to exit the low-wind control mode and enter the free operation mode.

[0146] In step S1305, if the condensing pressure is not close to the target pressure value, then step S1307 is executed to determine whether the running time of the low wind control mode has reached 30 minutes.

[0147] In step S1307, if the running time of the low wind control mode reaches 30 minutes, then step S1308 is executed.

[0148] In step S1307, if the running time of the low wind control mode has not reached 30 minutes, then step S1307 is executed.

[0149] In step S1304, if the running time of the low wind operation mode has not reached 10 minutes, then step S1304 is executed.

[0150] In step S1302, if the outdoor ambient temperature is not in the low-frequency operating range, then step S1306 is executed, the indoor fan 14 operates at high speed, and the compressor 26 operates according to the target pressure value.

[0151] Of course, during the execution of step S1306, it is possible to determine in real time whether the outdoor ambient temperature is within the low-frequency operating range.

[0152] Specifically, refer to Figure 14 This explains another control logic of air conditioner 100.

[0153] The indoor controller 11 sends a cooling start signal (step S1401) and determines whether the outdoor ambient temperature is within the low-frequency operating range (step S1402).

[0154] In step S1402, if the outdoor ambient temperature is within the low-frequency operating range, then step S1403 is executed, the operating frequency of the compressor 26 is calculated based on the outdoor ambient temperature, and a low-frequency operating signal is sent to the indoor controller 11; it is then determined whether the operating time of the low-wind operation mode has reached 10 minutes (step S1404).

[0155] In step S1404, if the running time of the low-wind operation mode reaches 10 minutes, then step S1405 is executed to determine whether the condensing pressure is close to the target pressure value.

[0156] In step S1405, if the condensing pressure is close to the target pressure value, then step S1408 is executed to exit the low-wind control mode and enter the free operation mode.

[0157] In step S1405, if the condensing pressure is not close to the target pressure value, then step S1407 is executed to determine whether the running time of the low wind control mode has reached 30 minutes.

[0158] In step S1407, if the running time of the low wind control mode reaches 30 minutes, then step S1408 is executed.

[0159] In step S1407, if the running time of the low wind control mode has not reached 30 minutes, then step S1407 is executed.

[0160] In step S1404, if the running time of the low wind operation mode has not reached 10 minutes, then step S1404 is executed.

[0161] In step S1402, if the outdoor ambient temperature is not in the low-frequency operating range, then step S1406 is executed, the indoor fan 14 operates at high speed, the compressor 26 operates according to the target pressure value, and then step S1402 is executed.

[0162] Reference Figure 15 The operation monitoring curve of the air conditioner after using the control logic of this application shows that in the initial stage, the air conditioner operates in a low-wind control mode indoors, which provides good comfort. In the stable stage, it operates in a stable mode with low wind speed, which provides good dehumidification and significantly improves comfort.

[0163] In this embodiment, the air conditioner 100 includes an indoor unit 1, an outdoor unit 2, and a refrigeration system. The indoor unit 1 also includes an indoor fan 14 for delivering air from the air conditioner 100 to the room. The refrigeration system includes a refrigerant circuit, which includes an indoor heat exchanger 12 located in the indoor unit 1, an expansion valve located in either the indoor unit 1 or the outdoor unit 2, a compressor 26 located in the outdoor unit 2, a four-way valve 25 located in the outdoor unit 2, and an outdoor heat exchanger 22 located in the outdoor unit 2. A pressure detection device 33 for detecting the refrigerant pressure of the indoor heat exchanger 12 and a temperature detection device 31 for detecting the outdoor ambient temperature are also located within the refrigeration system. When the air conditioner 100 is turned on, there are a start-up phase, a free-running phase, and a stable operation phase. This application mainly focuses on the start-up phase and the stable operation phase. In the start-up phase… When the indoor controller 11 detects that the indoor temperature meets the temperature control start-up conditions, it outputs a start-up signal to the outdoor controller 21. In response to the start-up signal, the outdoor controller 21 controls the air conditioner 100 to enter a low-fan control mode. The outdoor controller 21 sends a low-frequency operation signal to the indoor controller 11 via a 24V signal line, causing the indoor fan 14 to operate at a first fan speed to reduce the indoor airflow. Simultaneously, it adjusts the operating frequency of the compressor 26 based on the outdoor ambient temperature and refrigerant pressure. In the stable operation mode, when the outdoor ambient temperature reaches the fourth preset temperature condition and the difference between the refrigerant pressure and the preset target pressure reaches the first pressure range, the outdoor controller 21 sends a low-frequency operation signal to the indoor controller 11, causing the indoor fan 14 to operate at the first fan speed within the set low-fan speed range. These settings increase the cooling comfort during the initial start-up phase and the dehumidification capacity during stable operation, solving the problems of limited airflow, poor comfort, and poor low-frequency dehumidification capacity associated with 24V communication control.

[0164] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An air conditioner, characterized in that, include: The indoor unit contains an indoor fan, which is used to deliver air conditioning air into the room; Outdoor unit; A refrigeration system includes a refrigerant circuit, the refrigerant circuit including an indoor heat exchanger in the indoor unit, an expansion valve in the indoor unit or the outdoor unit, a compressor in the outdoor unit, a four-way valve in the outdoor unit, and an outdoor heat exchanger in the outdoor unit; A pressure detection device is installed in the refrigeration system and located on the pipe of the four-way valve near the indoor heat exchanger, for detecting the refrigerant pressure of the indoor heat exchanger; A temperature detection device is installed in the outdoor unit to detect the outdoor ambient temperature in order to adjust the operating frequency of the compressor. An indoor controller, located in the indoor unit, is configured to output a start-up signal to the outdoor controller when the indoor temperature is detected to meet the temperature control start-up conditions; The outdoor controller, located in the outdoor unit, is configured such that when it receives a start-up signal from the indoor controller, the air conditioner enters a low-speed control mode. The compressor first operates at a first operating frequency, and the outdoor controller sends a low-frequency operating signal to the indoor controller to make the indoor fan operate at a first speed to reduce the output of indoor air volume. The first speed meets the low-speed range. Based on the detected outdoor ambient temperature, the operating frequency of the compressor is adjusted to the preset compressor frequency according to the preset compressor control logic, so as to change the refrigerant temperature by adjusting the refrigerant pressure; When the difference between the refrigerant pressure and the target pressure value meets the preset exit condition, the air conditioner exits the low fan speed control mode.

2. The air conditioner according to claim 1, characterized in that, The preset compressor control logic includes: When the outdoor ambient temperature meets the first preset temperature condition, the compressor operates at the first preset compressor frequency, which is obtained based on the rated operating frequency and the first preset percentage. When the outdoor ambient temperature meets the second preset temperature condition, the compressor operates at the second preset compressor frequency, which is obtained based on the rated operating frequency and the second preset percentage. When the outdoor ambient temperature meets the third preset temperature condition, the third preset compressor frequency of the compressor is determined based on the outdoor ambient temperature value according to the first preset frequency-temperature relationship, wherein the first preset frequency-temperature relationship is a functional relationship between the proportion of the rated operating frequency and the outdoor ambient temperature.

3. The air conditioner according to claim 1, characterized in that, During the operation of the air conditioner in the low-wind control mode, after the compressor's operating frequency is first adjusted based on the outdoor ambient temperature, the outdoor controller no longer judges changes in the outdoor ambient temperature.

4. The air conditioner according to any one of claims 1-3, characterized in that, After exiting the low-wind control mode, the air conditioner enters the free operation mode. The outdoor controller does not send the low-frequency operation signal to the indoor controller, and the indoor fan operates at the second wind speed, wherein the second wind speed meets the high wind speed range. The operating frequency of the compressor gradually increases to a second operating frequency.

5. The air conditioner according to claim 4, characterized in that, After the air conditioner operates in the free operation mode, it enters the stable operation mode and adjusts the operating frequency of the compressor so that the difference between the refrigerant pressure and the preset target pressure reaches the upper limit of the first pressure range.

6. The air conditioner according to claim 5, characterized in that, During the stable operation mode of the air conditioner, when the outdoor ambient temperature reaches the fourth preset temperature condition and the difference between the refrigerant pressure and the preset target pressure reaches the upper limit of the first pressure range, the outdoor controller sends a low-frequency operation signal to the indoor controller, and the indoor fan operates at the first wind speed.

7. The air conditioner according to claim 6, characterized in that, During the stable operation mode of the air conditioner, when the outdoor ambient temperature reaches the fourth preset temperature condition, and the difference between the refrigerant pressure and the preset target pressure reaches the upper limit of the first pressure range, the third operating frequency of the compressor is determined according to the outdoor ambient temperature based on the second preset frequency-temperature relationship, wherein the second preset frequency-temperature relationship is a function of the ratio of the rated operating frequency and the outdoor ambient temperature.

8. The air conditioner according to claim 7, characterized in that, During the stable operation mode of the air conditioner, when the outdoor ambient temperature reaches the fifth preset temperature condition, the outdoor controller does not send a low-frequency operation signal to the indoor controller.

9. The air conditioner according to any one of claims 7-8, characterized in that, During the stable operation mode of the air conditioner, when the compressor's operating frequency is adjusted to the corresponding third operating frequency, if the outdoor ambient temperature always reaches the fourth preset temperature condition, the difference between the refrigerant pressure and the preset target pressure always reaches the upper limit of the first pressure range, the indoor fan always runs at the first wind speed, the compressor's operating frequency remains unchanged, and it is not forcibly shut down.

10. The air conditioner according to claim 4, characterized in that, During the operation of the air conditioner in the free operation mode, the air conditioner exits the mode after the operation time in the free operation mode reaches the first preset operation time.

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