Air conditioner control method and apparatus, air conditioner, and storage medium

Abstract

The present application relates to the technical field of air conditioners, and in particular to an air conditioner control method and apparatus, an air conditioner, and a storage medium. In the present application, when the air conditioner has both a cooling mode and a water heating mode, target subcooling degrees and actual subcooling degrees of condensing components in the air conditioner are acquired; on the basis of the target subcooling degrees and the actual subcooling degrees, the opening degrees of electronic expansion valves of flow paths where the condensing components are located are adjusted. Heat exchange requirements of different condensing components are determined on the basis of the actual subcooling degrees and the target subcooling degrees of the condensing components, so as to adjust the opening degrees of electronic expansion valves of flow paths where the condensing components are located.

Description

Control method and device of air conditioner, air conditioner and storage medium

[0001] Related applications

[0002] The present application claims priority to Chinese Patent Application No. 202410865191.1, filed on June 28, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of air conditioners, in particular to a control method and device of an air conditioner, an air conditioner and a storage medium. BACKGROUND

[0004] A multi-split water heater is generally matched with several air conditioner indoor units and one or more domestic hot water devices. The air conditioner indoor units are used for temperature adjustment of various rooms, and the domestic hot water devices are used for providing domestic hot water. Since the air conditioner indoor units and the domestic hot water devices share a set of heat pump systems, when the air conditioner has both refrigeration and hot water heating requirements, the waste heat generated by the indoor unit refrigeration and the heat required for hot water heating, the outdoor heat exchanger can absorb and dissipate heat. If the heat distribution is unreasonable, it will affect the heat exchange efficiency of the three heat exchangers, reduce the operating energy efficiency of the air conditioner, and affect the refrigeration and hot water heating effects.

[0005] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0006] The main purpose of the present application is to provide a control method and device of an air conditioner, an air conditioner and a storage medium, which aims to solve the technical problem of unreasonable refrigerant distribution leading to low energy efficiency when heating and hot water heating are performed simultaneously in the multi-split air conditioner of the prior art.

[0007] To achieve the above-mentioned purpose, the present application provides a control method of an air conditioner, which is applied to a multi-split air conditioner. The multi-split air conditioner comprises an air conditioner outdoor unit, at least one air conditioner indoor unit and a domestic hot water device. The air conditioner outdoor unit is connected with each air conditioner indoor unit and the domestic hot water device. The air conditioner outdoor unit comprises a compressor, an outdoor heat exchanger, a reversing device and a main route electronic expansion valve. The air conditioner indoor unit comprises an indoor heat exchanger. The domestic hot water device comprises a hot water heating tank and a branch route electronic expansion valve.

[0008] The method comprises the following steps:

[0009] When the air conditioner simultaneously exists a refrigeration mode and a hot water heating mode, the target supercooling degree and the actual supercooling degree of each condensing component in the air conditioner are obtained.

[0010] adjusting an opening degree of an electronic expansion valve in a flow path of each condensing component according to the target supercooling degree and the actual supercooling degree.

[0011] In an embodiment, the condensing components of the air conditioner at least include a heating water tank, and an electronic expansion valve in a flow path of the heating water tank is a branch electronic expansion valve.

[0012] The target supercooling degree and the actual supercooling degree of each condensing component in the air conditioner are obtained, including:

[0013] The first outlet refrigerant temperature of the heating water tank, the water tank water temperature, and the discharge pressure of the compressor are obtained.

[0014] The actual supercooling degree of the heating water tank is determined according to a saturation temperature corresponding to the first outlet refrigerant temperature and the discharge pressure, and the target supercooling degree of the heating water tank is queried based on the water tank water temperature.

[0015] The opening degree of the electronic expansion valve in the flow path of each condensing component is adjusted according to the target supercooling degree and the actual supercooling degree, including:

[0016] The opening degree of the branch electronic expansion valve is adjusted according to the target supercooling degree and the actual supercooling degree of the heating water tank.

[0017] In an embodiment, the opening degree of the branch electronic expansion valve is adjusted according to the target supercooling degree and the actual supercooling degree of the heating water tank, including:

[0018] A first opening degree change value is determined according to the target supercooling degree and the actual supercooling degree of the heating water tank.

[0019] The opening degree of the branch electronic expansion valve is adjusted according to the first opening degree change value.

[0020] In an embodiment, the opening degree of the branch electronic expansion valve is adjusted according to the first opening degree change value, including:

[0021] When the first opening degree change value is greater than a first opening degree threshold value, the first opening degree change value is corrected according to a first coefficient, and the opening degree of the branch electronic expansion valve is adjusted according to the corrected first opening degree change value.

[0022] When the first opening degree change value is less than or equal to the first opening degree threshold value, the first opening degree change value is corrected according to a second coefficient, and the opening degree of the branch electronic expansion valve is adjusted according to the corrected first opening degree change value, the second coefficient being less than the first coefficient.

[0023] In an embodiment, the control method of the air conditioner further includes:

[0024] controlling the opening degree of the shunt electronic expansion valve to increase or remain unchanged for a first duration, and when the saturation temperature is greater than or equal to a first temperature threshold;

[0025] periodically reducing the opening degree of the shunt electronic expansion valve based on a preset first step when the air conditioner meets a preset electric heating condition.

[0026] In an embodiment, the condensing component of the air conditioner further comprises an outdoor heat exchanger, and an electronic expansion valve of a flow path where the outdoor heat exchanger is located is a main path electronic expansion valve;

[0027] The obtaining of the target supercooling degree and the actual supercooling degree of each condensing component in the air conditioner further comprises:

[0028] obtaining a second outlet refrigerant temperature of the outdoor heat exchanger, an outdoor environment temperature of a region where the outdoor heat exchanger is located, and a discharge pressure of the compressor;

[0029] determining the actual supercooling degree of the outdoor heat exchanger according to a saturation temperature corresponding to the second outlet refrigerant temperature and the discharge pressure, and querying the target supercooling degree of the outdoor heat exchanger based on the outdoor environment temperature;

[0030] The adjusting of the opening degree of the electronic expansion valve of the flow path of each condensing component according to the target supercooling degree and the actual supercooling degree further comprises:

[0031] adjusting the opening degree of the main path electronic expansion valve according to the target supercooling degree and the actual supercooling degree of the outdoor heat exchanger.

[0032] In an embodiment, the adjusting of the opening degree of the main path electronic expansion valve according to the target supercooling degree and the actual supercooling degree of the outdoor heat exchanger comprises:

[0033] determining a second opening degree change value according to the target supercooling degree and the actual supercooling degree of the outdoor heat exchanger;

[0034] adjusting the opening degree of the main path electronic expansion valve according to the second opening degree change value.

[0035] In an embodiment, the adjusting of the opening degree of the main path electronic expansion valve according to the second opening degree change value comprises:

[0036] when the second opening degree change value is greater than a second opening degree threshold value, correcting the second opening degree change value according to a third coefficient, and adjusting the opening degree of the main path electronic expansion valve according to the corrected second opening degree change value, the second opening degree threshold value being greater than a first opening degree threshold value;

[0037] when the second opening degree change value is less than or equal to the second opening degree threshold value and greater than a third opening degree threshold value, maintaining the opening degree of the main path electronic expansion valve unchanged;

[0038] When the second opening degree change value is less than or equal to a third opening degree threshold value, which is less than the first opening degree threshold value, the first opening degree change value is corrected according to a fourth coefficient, which is less than the third coefficient, and the opening degree of the main route electronic expansion valve is adjusted according to the corrected second opening degree change value.

[0039] In an embodiment, before the opening degree of the electronic expansion valve of the flow path where each condensing component is located is adjusted according to the target supercooling degree and the actual supercooling degree, the control method of the air conditioner further comprises:

[0040] The opening degree of the branch electronic expansion valve is adjusted based on a preset initial opening degree, and maintained for a preset time length.

[0041] In an embodiment, the control method of the air conditioner further comprises:

[0042] The exhaust temperature of the compressor is obtained.

[0043] When the exhaust temperature is greater than a second temperature threshold value for a second time length, the opening degree of the branch electronic expansion valve is controlled to increase or remain unchanged until the exhaust temperature is less than or equal to the second temperature threshold value.

[0044] The second time length is less than the first time length, and the first temperature threshold value is less than the second temperature threshold value.

[0045] In an embodiment, the control method of the air conditioner further comprises:

[0046] When the exhaust temperature is greater than a third temperature threshold value for a second time length, the opening degree of the branch electronic expansion valve is increased based on a preset first step length, and the second temperature threshold value is less than the third temperature threshold value.

[0047] The opening degree of the branch electronic expansion valve is periodically increased based on a preset first step length until the opening degree of the branch electronic expansion valve reaches a maximum opening degree, or the exhaust temperature is less than or equal to a second temperature threshold value for a second time length.

[0048] In an embodiment, the indoor unit of the air conditioner further comprises an indoor electronic expansion valve, which is arranged corresponding to each indoor heat exchanger.

[0049] The control method of the air conditioner further comprises:

[0050] When the exhaust temperature is greater than or equal to a fourth temperature threshold value, or the opening degree of at least two indoor electronic expansion valves is greater than or equal to a preset initial opening degree, the opening degree of the main route electronic expansion valve is periodically increased based on a preset second step length, the fourth temperature threshold value is greater than the third temperature threshold value, and the preset second step length is less than the preset first step length.

[0051] In addition, to achieve the above object, the application further provides a control device of an air conditioner, which comprises:

[0052] an acquisition module, configured to acquire target supercooling degrees and actual supercooling degrees of each condensing component in the air conditioner when the air conditioner simultaneously exists a refrigeration mode and a hot water mode;

[0053] an adjustment module, configured to adjust an opening degree of an electronic expansion valve in a flow path of each condensing component according to the target supercooling degrees and the actual supercooling degrees.

[0054] In addition, to achieve the above object, the application further provides an air conditioner, which comprises a memory, a processor and a control program of the air conditioner stored in the memory and executable on the processor, and the control program of the air conditioner is configured to implement the steps of the control method of the air conditioner.

[0055] In addition, to achieve the above object, the application further provides a storage medium, which stores a control program of an air conditioner, and the control program of the air conditioner implements the steps of the control method of the air conditioner when executed by a processor.

[0056] In addition, to achieve the above object, the application further provides a computer program product, which comprises a computer program, and the computer program implements the steps of the control method of the air conditioner when executed by a processor.

[0057] The one or more technical solutions provided by the application have at least the following technical effects: the target supercooling degrees and the actual supercooling degrees of each condensing component in the air conditioner are acquired when the air conditioner simultaneously exists a refrigeration mode and a hot water mode; the opening degree of the electronic expansion valve in the flow path of each condensing component is adjusted according to the target supercooling degrees and the actual supercooling degrees; the heat exchange demand of the condensing component is determined according to the actual supercooling degree and the target supercooling degree of the condensing component, so as to adjust the opening degree of the electronic expansion valve in the flow path of the condensing component, realize accurate distribution of refrigerant in the air conditioner, improve the heat exchange efficiency of the air conditioner, and avoid the technical problem that the air conditioner has low energy efficiency due to unreasonable distribution of refrigerant when the multi-split air conditioner simultaneously performs heating and hot water heating in the prior art, and improve the use energy efficiency of the air conditioner. BRIEF DESCRIPTION OF DRAWINGS

[0058] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0059] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, the other drawings can be obtained based on these drawings without any creative effort.

[0060] Fig. 1 is a flow diagram of a first embodiment of the control method of the air conditioner of the present application;

[0061] Fig. 2 is a structure diagram of one of the multi-connected air conditioners of the control method of the air conditioner of the present application;

[0062] Fig. 3 is a structure diagram of another of the multi-connected air conditioners of the control method of the air conditioner of the present application;

[0063] Fig. 4 is a flow diagram of a second embodiment of the control method of the air conditioner of the present application;

[0064] Fig. 5 is a flow diagram of a third embodiment of the control method of the air conditioner of the present application;

[0065] Fig. 6 is a flow diagram of a fourth embodiment of the control method of the air conditioner of the present application;

[0066] Fig. 7 is a structure block diagram of a first embodiment of the control device of the air conditioner of the present application;

[0067] Fig. 8 is a structure diagram of the air conditioner of the hardware running environment involved in the embodiments of the present application.

[0068] Explanation of reference numerals:

[0069] The implementation, functional features and advantages of the present application will be further explained with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0070] It should be understood that the specific embodiments described herein are merely intended to explain the technical solutions of the present application, and not to limit the present application.

[0071] In order to better understand the technical solutions of the present application, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0072] The main solution of the embodiments of the present application is that when the air conditioner simultaneously exists the refrigeration and heating water modes, the target supercooling degree and the actual supercooling degree of each condensing component in the air conditioner are obtained; and the opening degree of the electronic expansion valve of the flow path where each condensing component is located is adjusted according to the target supercooling degree and the actual supercooling degree.

[0073] In the present embodiment, for the convenience of description, the following will be described with the identification of the control of the air conditioner as the execution subject.

[0074] Since the air conditioner indoor unit and the domestic hot water device share a set of heat pump system in the prior art, when the multi-split air conditioner has both refrigeration and hot water heating requirements, at least two or more condensing components exist in the domestic hot water device and the air conditioner indoor unit. If the refrigerant distribution is unreasonable, the heat exchange efficiency of the two condensing components is affected, and the operating energy efficiency of the air conditioner is reduced, which greatly affects the normal use of the user

[0075] The present application provides a solution. The heat exchange requirement of a condensing component is determined according to the actual supercooling degree and the target supercooling degree of the condensing component, so as to adjust the opening degree of the electronic expansion valve in the flow path where the condensing component is located, realize accurate distribution of the refrigerant in the air conditioner, and improve the heat exchange efficiency of the air conditioner.

[0076] Based on this, the embodiment of the present application provides a control method of an air conditioner. Referring to FIG. 1, FIG. 1 is a flowchart of a first embodiment of a control method of an air conditioner according to the present application.

[0077] In this embodiment, the control method of the air conditioner comprises the following steps:

[0078] Step S10: When the air conditioner simultaneously exists in a refrigeration and hot water heating mode, the target supercooling degree and the actual supercooling degree of each condensing component in the air conditioner are obtained.

[0079] The execution subject of this embodiment can be the air conditioner device, which has functions of data processing, data communication and program running, and the air conditioner device can be a controller of a multi-split air conditioner. Of course, it can also be other devices with similar functions, and the present embodiment does not limit it. For the sake of convenience, the controller of the multi-split air conditioner is taken as an example for illustration.

[0080] The air conditioner in this embodiment refers to a multi-split air conditioner. The multi-split air conditioner is an air conditioner that connects one outdoor unit to multiple indoor units, and can realize the function of adjusting air temperature, humidity, cleanliness and air flow rate in multiple rooms, including but not limited to refrigeration, heating and fresh air circulation modes.

[0081] The multi-split air conditioner in this embodiment comprises an air conditioner outdoor unit, an air conditioner indoor unit and a domestic hot water device. The outdoor unit is connected to each air conditioner indoor unit and the domestic hot water device. The air conditioner outdoor unit comprises a compressor, an outdoor heat exchanger and a reversing device. The air conditioner indoor unit comprises at least one indoor heat exchanger. The domestic hot water device is provided with a hot water tank at the end.

[0082] The reversing device in the embodiment includes a first port, a second port, a third port, and a fourth port. The first port of the reversing device is connected with the second end of each indoor heat exchanger in the air conditioner indoor unit respectively. The second port of the reversing device is connected with the suction port of the compressor. The third port of the reversing device is connected with the second end of the outdoor heat exchanger. The fourth port of the reversing device is connected with the discharge port of the compressor.

[0083] In addition, the reversing device in the embodiment can be at least one four-way valve. Referring to FIG. 2 and FIG. 3, FIG. 2 is a structure schematic diagram of a multi-split air conditioner in which two four-way valves form a reversing device. In the architecture of the multi-split air conditioner, the first select terminal E of the first four-way valve is equivalent to the first port of the reversing device and is connected with the second end of each indoor heat exchanger in the air conditioner indoor unit respectively. The second select terminal S of the first four-way valve is connected with the suction port of the compressor. The third select terminal C of the first four-way valve is idle. The fourth select terminal D of the first four-way valve is connected with the discharge port of the compressor. The first select terminal E of the second four-way valve is idle. The second select terminal S of the second four-way valve is connected with the suction port of the compressor. The third select terminal C of the second four-way valve is equivalent to the third port of the reversing device and is connected with the second end of the outdoor heat exchanger. The fourth select terminal D of the second four-way valve is connected with the discharge port of the compressor. The discharge port of the compressor is connected with the first end of the branch electronic expansion valve in the domestic hot water device, which can be used to provide the domestic hot water device with heat exchange refrigerant to realize hot water production.

[0084] In the above embodiment, since the refrigerant output end of the compressor is directly communicated with the flow path where the hot water tank is located, no matter how to switch the communication device of each reversing device, the high-temperature and high-pressure refrigerant is output to the hot water tank, the water temperature is continuously heated, the water temperature is too high and cannot meet the user's demand. At this time, only by closing the heat pump system of the multi-split air conditioner can the water temperature of the tank be controlled. Therefore, the embodiment proposes a scheme of arranging three reversing devices in the multi-split air conditioner.

[0085] FIG. 3 is a structure schematic diagram of a multi-split air conditioner in which three four-way valves form a reversing device. In the architecture of the multi-split, the reversing device includes a first four-way valve, a second four-way valve, and a third four-way valve. The first four-way valve is connected with the compressor and the outdoor heat exchanger respectively. The second four-way valve is connected with the compressor and the indoor heat exchanger respectively. The third four-way valve is connected with the compressor and the hot water tank respectively. In this way, the refrigerant flowing through the domestic hot water device is controlled by the second four-way valve, which avoids the situation that the water temperature is continuously heated, the water temperature is too high, and cannot meet the user's demand.

[0086] In addition, the air conditioner outdoor unit is respectively provided with a throttling element between each air conditioner indoor unit and the domestic hot water device, and the throttling element includes an electronic expansion valve and a capillary tube, etc. In the embodiment, the electronic expansion valve is mainly taken as an example for description. The throttling element between the air conditioner outdoor unit and each air conditioner indoor unit and the domestic hot water device can include a main path electronic expansion valve, a branch path electronic expansion valve and an indoor electronic expansion valve. The branch path electronic expansion valve refers to the electronic expansion valve between the domestic hot water device and the compressor, and the indoor electronic expansion valve refers to the electronic expansion valve arranged between each indoor heat exchanger and the outdoor heat exchanger. The embodiment does not make specific limitation.

[0087] In a specific implementation, since the application scenario of the present application is a summer heat pump system refrigeration, at this time, in order to realize hot water production, the prior art generally performs electric heating on the hot water tank. However, the electric heating mode has high energy consumption and cannot realize the recovery of the waste heat of the air conditioner.

[0088] In the embodiment, since the air conditioner simultaneously has the requirements of refrigeration and hot water production, the components playing a condensing role in the running process of the air conditioner are the outdoor heat exchanger and the hot water tank in the domestic hot water device, that is, each condensing component in the air conditioner includes the outdoor heat exchanger and the hot water tank.

[0089] In addition, the target supercooling degree of each condensing component is related to the environment affecting the temperature change thereof. For example, for the outdoor heat exchanger, the target supercooling degree is related to the outdoor environment temperature of the region where the outdoor heat exchanger is located. For the hot water tank, the water stored in the tank has a greater impact on the supercooling degree of the tank than air, and therefore the water temperature of the tank affects the target supercooling degree of the hot water tank.

[0090] The actual supercooling degree is determined according to the difference between the saturation temperature corresponding to the condensing pressure and the outlet refrigerant temperature of the condensing component.

[0091] Step S20: adjusting the opening degree of the electronic expansion valve of the flow path where each condensing component is located according to the target supercooling degree and the actual supercooling degree.

[0092] In a specific implementation, the adjustment logic of the opening degree of the electronic expansion valve of the flow path where each condensing component is located is relatively independent. That is, when adjusting the opening degree of the main path electronic expansion valve of the outdoor unit flow path where the outdoor heat exchanger is located, the target supercooling degree and the actual supercooling degree of the outdoor heat exchanger need to be considered. When adjusting the opening degree of the branch path electronic expansion valve of the outdoor unit flow path where the hot water tank is located, the target supercooling degree and the actual supercooling degree of the hot water tank need to be considered.

[0093] In addition, in the embodiment, before the adjusting of the opening degree of the electronic expansion valve of the flow path where each condensing component is located according to the target supercooling degree and the actual supercooling degree, the control method of the air conditioner further includes:

[0094] Adjust the opening degree of the electronic expansion valve based on a preset initial opening degree, and maintain for a preset time length.

[0095] In a specific implementation, the preset initial opening degree and the preset time length can be different according to different condensing components, for example, the initial opening degree of the electronic expansion valve corresponding to the water tank is P_init1, and the value range of P_init1 is 400-480, and the value range of the preset time length Tm_init1 is 0-10 minutes, and then the step of adjusting the opening degree of the electronic expansion valve of the flow path where each condensing component is located according to the target supercooling degree and the actual supercooling degree is performed, to realize automatic control.

[0096] In addition, when the water tank is needed, the opening degree range of the electronic expansion valve is ∈ [P_min1, P_max1], wherein the value range of P_min1 is 0-100, and the value range of P_max1 is 400-480.

[0097] The initial opening degree of the main road electronic expansion valve corresponding to the outdoor heat exchanger is P_init2, and the value range of P_init2 is 400-480, and the value range of the preset time length Tm_init2 is 0-10 minutes, and then the step of adjusting the opening degree of the electronic expansion valve of the flow path where each condensing component is located according to the target supercooling degree and the actual supercooling degree is performed, to realize automatic control, and the opening degree range of the main road electronic expansion valve is ∈ [P_min2, P_max2], wherein the value range of P_min1 is 0-100, and the value range of P_max1 is 400-480.

[0098] In the air conditioner, the target supercooling degree and the actual supercooling degree of each condensing component are obtained when the air conditioner simultaneously exists in the refrigeration and heating water modes, the opening degree of the electronic expansion valve of the flow path where each condensing component is located is adjusted according to the target supercooling degree and the actual supercooling degree, the heat exchange demand of the condensing component is determined according to the actual supercooling degree and the target supercooling degree of the different condensing components, the opening degree of the electronic expansion valve of the flow path where the condensing component is located is adjusted, the precise distribution of the refrigerant in the air conditioner is realized, the heat exchange efficiency of the air conditioner is improved, the technical problem that the refrigerant distribution is unreasonable and the energy efficiency of the air conditioner is low when the heating and the heating water are simultaneously performed in the multi-split air conditioner in the prior art is avoided, and the use energy efficiency of the air conditioner is improved.

[0099] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as the above embodiment one can refer to the above introduction, and will not be described hereinafter. On this basis, please refer to FIG. 4, step S10, comprising:

[0100] Step S101: obtaining the first outlet refrigerant temperature of the heating water tank, the water tank water temperature, and the discharge pressure of the compressor.

[0101] The water temperature of the heating water tank includes but is not limited to the water temperature in the water tank and the water tank coil middle temperature, wherein the water tank temperature can be the average value between the water temperature at the upper part of the water tank and the water temperature at the lower part of the water tank, and the water tank coil middle temperature refers to the refrigerant saturation temperature corresponding to the compressor discharge pressure, which is related to factors such as refrigerant category and refrigerant pressure in the embodiment, and its main functions are temperature control, heat exchange and energy efficiency improvement, etc. Considering that there is pressure loss when the refrigerant passes through various heat exchange devices, and there is basically no pressure loss when the refrigerant is transmitted in the pipeline, the middle temperature of the coil of the heating water tank directly connected with the compressor refrigerant output end is taken as the refrigerant saturation temperature corresponding to the discharge pressure in the embodiment.

[0102] The discharge pressure of the compressor refers to the refrigerant pressure value at the discharge port of the compressor.

[0103] Step S102: determining the actual supercooling degree of the heating water tank according to the first outlet refrigerant temperature and the saturation temperature corresponding to the discharge pressure, and querying the target supercooling degree of the heating water tank based on the water tank water temperature.

[0104] The supercooling degree refers to the temperature difference of the part that is cooled beyond the saturation temperature after the refrigerant in the condenser reaches the saturated liquid state. When calculating the actual supercooling degree of the heating water tank, the actual supercooling degree of the heating water tank can be obtained by the difference between the discharge pressure of the compressor and the first outlet refrigerant temperature of the heating water tank.

[0105] When querying the target supercooling degree of the heating water tank based on the water tank water temperature, the mapping relationship between the water tank water temperature interval and the target supercooling degree in Table 1 can be referred to for determination.

[0106] Table 1

[0107] Step S20, comprising:

[0108] Step S201: adjusting the opening degree of the shunt electronic expansion valve according to the target supercooling degree and the actual supercooling degree of the heating water tank.

[0109] The target supercooling degree and the actual supercooling degree of the heating water tank represent the heating energy demand of the heating water tank to some extent, and in the embodiment, the difference between the actual supercooling degree and the target supercooling degree can be taken as the opening degree adjustment value of the electronic expansion valve of the flow path where the heating water tank is located.

[0110] In an embodiment, the adjusting the opening degree of the shunt electronic expansion valve according to the target supercooling degree and the actual supercooling degree of the heating water tank comprises:

[0111] determining a first opening degree change value according to the target supercooling degree and the actual supercooling degree of the heating water tank;

[0112] adjusting the opening degree of the branch electronic expansion valve according to the first opening degree change value.

[0113] In a specific implementation, the change opening degree of the branch electronic expansion valve is a difference between the actual supercooling degree and the target supercooling degree, and the single change opening degree of the branch electronic expansion valve is in a range of (-15, 15).

[0114] In an embodiment, the adjusting the opening degree of the branch electronic expansion valve according to the first opening degree change value comprises:

[0115] when the first opening degree change value is greater than a first opening degree threshold, correcting the first opening degree change value according to a first coefficient, and adjusting the opening degree of the branch electronic expansion valve according to the corrected first opening degree change value;

[0116] when the first opening degree change value is less than or equal to the first opening degree threshold, correcting the first opening degree change value according to a second coefficient, and adjusting the opening degree of the branch electronic expansion valve according to the corrected first opening degree change value, the second coefficient being less than the first coefficient.

[0117] In a specific implementation, the speed of increasing the opening degree of the branch electronic expansion valve is faster than the speed of decreasing the opening degree of the branch electronic expansion valve, because, in the running process of the air conditioner, if the heat exchange energy demand is insufficient, the opening degree of the electronic expansion valve can be increased to increase the refrigerant and speed up the heat exchange, so as to quickly meet the user demand, but if the heat exchange energy demand is excessive, even if the opening degree of the electronic expansion valve is decreased, the speed of reducing the energy demand will be low due to the residual heat of the refrigerant or the environment, in order to avoid the fact that all or most of the refrigerant completes the heat exchange, the speed of decreasing the opening degree is reduced, and the service life of the air conditioner can be prolonged.

[0118] Therefore, in the embodiment, according to the positive and negative of the first opening degree change value, the embodiment has different correction strategies for adjusting the opening degree of the branch electronic expansion valve, for example: the value of the first opening degree threshold is 0, when the first change change value is greater than 0, the first opening degree change value is corrected according to the first coefficient, and the opening degree of the branch electronic expansion valve is adjusted according to the corrected first opening degree change value and the original opening degree; when the first change change value is less than or equal to 0, the first opening degree change value is corrected according to the second coefficient, and the opening degree of the branch electronic expansion valve is adjusted according to the corrected first opening degree change value and the original opening degree, by setting the second coefficient to be less than the first coefficient, the speed of increasing the opening degree of the electronic expansion valve is increased, and the heat exchange demand of the heating water tank is quickly met, wherein the value of the first coefficient and the second coefficient is in a range of 1-5, and the embodiment does not make specific limitation on this.

[0119] In an embodiment, the control method of the air conditioner further comprises:

[0120] controlling the opening degree of the shunt electronic expansion valve to increase or remain unchanged for a first duration, and when the saturation temperature is greater than or equal to a first temperature threshold;

[0121] periodically reducing the opening degree of the shunt electronic expansion valve by a preset first step when the air conditioner meets a preset electric heating condition.

[0122] The first duration can be 1 min, and the first temperature threshold can be 58℃. That is, when the saturation temperature Tc is greater than or equal to the first temperature threshold 58℃ for 1 min, the opening degree of the shunt electronic expansion valve is not allowed to be reduced when controlling the opening degree, so as to prevent the user's hot water demand from being met.

[0123] The preset electric heating condition refers to that after the compressor starts the push valve for a preset duration, the difference between the saturation temperature and the water tank water temperature is less than a certain threshold for a certain duration, and at this time the electric auxiliary heating device in the domestic hot water device is started, for example: if (Tc-Tk) <1℃ (integer value comparison) is detected for 5 min after the compressor starts the push valve for 20 min and the electric heating is turned on.

[0124] In a specific implementation, when the refrigerant provided by the compressor is insufficient to meet the user's hot water demand, in order to reduce the energy consumption of the air conditioner and avoid affecting the normal operation of the indoor unit of the air conditioner, the embodiment detects (Tc-Tk) <1℃ (integer value comparison) for 5 min after the compressor starts the push valve for 20 min and the electric heating is turned on, and then the opening degree of the electronic expansion valve is reduced by a certain period every time. The step size of each adjustment is in the range of 0-50 steps, until the difference between the saturation temperature and the water tank water temperature is greater than 4℃ for 10s, or when the water tank temperature is greater than or equal to the set water tank temperature Tks, the step of periodically reducing the opening degree of the shunt electronic expansion valve by a preset first step is exited.

[0125] The embodiment determines the actual supercooling degree of the domestic hot water tank according to the first outlet refrigerant temperature of the domestic hot water tank and the saturation temperature corresponding to the discharge pressure of the compressor, and queries the target supercooling degree of the domestic hot water tank based on the water tank water temperature. The opening degree of the shunt electronic expansion valve is adjusted combined with the difference between the target supercooling degree and the actual supercooling degree, so as to accurately adjust the proportion of refrigerant flowing through the domestic hot water device and improve the efficiency of hot water production.

[0126] Based on the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as the above-mentioned first embodiment can be referred to the above introduction, and will not be described in detail. On this basis, please refer to FIG. 5, step S10, comprising:

[0127] Step S101`: Obtain the second outlet refrigerant temperature of the outdoor heat exchanger, the outdoor ambient temperature of the region where the outdoor heat exchanger is located, and the discharge pressure of the compressor.

[0128] Step S102`: Determine the actual supercooling degree of the outdoor heat exchanger according to the saturation temperature corresponding to the second outlet refrigerant temperature and the discharge pressure, and query the target supercooling degree of the outdoor heat exchanger based on the outdoor ambient temperature.

[0129] In a specific implementation, when calculating the actual supercooling degree of the outdoor heat exchanger, the actual supercooling degree of the outdoor heat exchanger can be obtained by the difference between the discharge pressure of the compressor and the second outlet refrigerant temperature of the outdoor heat exchanger.

[0130] When querying the target supercooling degree of the outdoor heat exchanger based on the outdoor ambient temperature of the region where the outdoor heat exchanger is located, the mapping relationship between the outdoor ambient temperature interval and the target supercooling degree in Table 1 can be referred to for determination.

[0131] Table 2

[0132] Step S20, the control method of the air conditioner comprises:

[0133] Step S201`: Adjust the opening degree of the main route electronic expansion valve according to the target supercooling degree and the actual supercooling degree of the outdoor heat exchanger.

[0134] The target supercooling degree and the actual supercooling degree of the outdoor heat exchanger to some extent represent the heat exchange energy requirement of the outdoor heat exchanger, and in this embodiment, the difference between the actual supercooling degree and the target supercooling degree can be used as the opening degree adjustment value of the electronic expansion valve of the flow path where the outdoor heat exchanger is located.

[0135] In an embodiment, the adjusting of the opening degree of the main route electronic expansion valve according to the target supercooling degree and the actual supercooling degree of the outdoor heat exchanger comprises:

[0136] determining a second opening degree change value according to the target supercooling degree and the actual supercooling degree of the outdoor heat exchanger;

[0137] adjusting the opening degree of the main route electronic expansion valve according to the second opening degree change value.

[0138] In a specific implementation, the change in the opening degree of the main route electronic expansion valve is the difference between the actual supercooling degree and the target supercooling degree, and the value range of the single change in the opening degree of the main route electronic expansion valve is between (-15, 15).

[0139] In an embodiment, the adjusting of the opening degree of the main route electronic expansion valve according to the second opening degree change value comprises:

[0140] When the second opening degree change value is greater than a second opening degree threshold value, which is greater than the first opening degree threshold value, the second opening degree change value is corrected according to a third coefficient, and the opening degree of the main-path electronic expansion valve is adjusted according to the corrected second opening degree change value;

[0141] When the second opening degree change value is less than or equal to the second opening degree threshold value and greater than a third opening degree threshold value, the opening degree of the main-path electronic expansion valve is maintained unchanged.

[0142] When the second opening degree change value is less than or equal to the third opening degree threshold value, the first opening degree change value is corrected according to a fourth coefficient, which is less than the third coefficient, and the opening degree of the main-path electronic expansion valve is adjusted according to the corrected second opening degree change value, and the third opening degree threshold value is less than the first opening degree threshold value.

[0143] In a specific implementation, the speed of increasing the opening degree of the main-path electronic expansion valve is faster than the speed of decreasing the opening degree of the main-path electronic expansion valve, and in this embodiment, because the indoor heat exchangers of multiple air conditioners may operate simultaneously in the multi-split air conditioner in the refrigeration mode, if the heat exchange capacity of the outdoor heat exchanger needs to change more sensitively, the main-path electronic expansion valve will be adjusted frequently. In order not to affect the normal use of the user, reduce the adjustment frequency of the main-path electronic expansion valve, and prolong the service life of the main-path electronic expansion valve, this embodiment sets a change value interval between the second opening degree threshold value and the third opening degree threshold value, that is, when the second opening degree change value of the outdoor heat exchanger is less than or equal to the second opening degree threshold value and greater than the third opening degree threshold value, the opening degree of the main-path electronic expansion valve is maintained unchanged, so as to avoid that the adjustment frequency of the main-path electronic expansion valve is too large and affects the service life of the main-path electronic expansion valve.

[0144] Therefore, in this embodiment, the second opening degree threshold value is 1, and the third opening degree threshold value is -1. When the second change value is greater than 1, the second opening degree change value is corrected according to the third coefficient, and the opening degree of the main-path electronic expansion valve is adjusted according to the corrected second opening degree change value. When the first change value is less than or equal to 1 and greater than -1, the opening degree of the main-path electronic expansion valve is maintained unchanged. When the first change value is less than or equal to -1, the first opening degree change value is corrected according to the fourth coefficient, and the opening degree of the main-path electronic expansion valve is adjusted according to the corrected second opening degree change value. By setting the fourth coefficient to be less than the third coefficient, the rate of increasing the opening degree of the electronic expansion valve is increased, and the heat exchange demand of the outdoor heat exchanger is quickly met, where the third coefficient and the fourth coefficient are in a range of 1-5, and this embodiment does not specifically limit this.

[0145] The embodiment determines the actual supercooling degree of the outdoor heat exchanger according to the second outlet refrigerant temperature of the outdoor heat exchanger and the saturated temperature corresponding to the exhaust pressure of the compressor, and queries the target supercooling degree of the outdoor heat exchanger based on the outdoor ambient temperature, adjusts the opening degree of the main electronic expansion valve in combination with the difference between the target supercooling degree and the actual supercooling degree, and realizes accurate adjustment of the proportion of refrigerant flowing through the outdoor heat exchanger, thereby improving the refrigeration efficiency.

[0146] In the fourth embodiment of the present application, the same or similar contents as the above-mentioned first embodiment can be referred to the above description, and will not be described in detail. On this basis, referring to FIG. 6, the control method of the air conditioner further includes:

[0147] Step S30: obtaining the exhaust temperature of the compressor.

[0148] The exhaust temperature of the compressor refers to the refrigerant temperature at the exhaust port of the compressor.

[0149] Step S40: when the exhaust temperature is greater than a second temperature threshold for a second time duration, the opening degree of the branch electronic expansion valve is controlled to be increased or unchanged until the exhaust temperature is less than or equal to the second temperature threshold.

[0150] In view of the operation performance and safety of the air conditioner in extreme cases, the present embodiment further controls the main electronic expansion valve of the flow path where the outdoor heat exchanger is located and the branch electronic expansion valve of the flow path where the heating water tank is located according to the exhaust temperature of the compressor, and the priority of the control logic is higher than that of the above-mentioned embodiments.

[0151] Specifically, the second time duration can be 10s, and the second temperature threshold can be 95℃. If the refrigerant temperature at the exhaust port of the compressor reaches 95℃, the high-temperature refrigerant has a relatively large heat exchange pressure on the pipeline and each element. If the opening degree of the branch electronic expansion valve is reduced, the refrigerant heat exchange will not be complete, which affects the service life of the air conditioner. Therefore, when the exhaust temperature of the compressor is greater than the second temperature threshold 95℃ for 10s, the opened branch electronic expansion valve is not allowed to be reduced, and when the exhaust temperature is less than or equal to the second temperature threshold 95℃ for 10s, the opening degree of the branch electronic expansion valve is allowed to be reduced.

[0152] In an embodiment, the control method of the air conditioner further includes:

[0153] When the exhaust temperature is greater than a third temperature threshold for a second time duration, the branch electronic expansion valve is increased based on a preset first step, and the second temperature threshold is less than the third temperature threshold.

[0154] periodically increase the opening degree of the branch electronic expansion valve by a preset first step length until the opening degree of the branch electronic expansion valve reaches a maximum opening degree, or for a second time length, the exhaust gas temperature is less than or equal to a second temperature threshold.

[0155] In a specific implementation, the third temperature threshold can be 100℃, and when the exhaust gas temperature TP of the compressor is greater than the third temperature threshold 100℃ for 10s continuously, the branch electronic expansion valve after starting has no periodic restriction, and immediately increases the preset first step length, and the preset first compensation has a value range of 0-50 steps, and then increases the preset first step length every period until the maximum opening degree of the branch electronic expansion valve is reached; once this control is entered, only when the exhaust gas temperature is less than or equal to the second temperature threshold 95℃ for 10s continuously, the control can be exited, and the step of adjusting the opening degree of the electronic expansion valve of each condensing component according to the target supercooling degree and the actual supercooling degree is restored.

[0156] In an embodiment, the air conditioner indoor unit further comprises an indoor electronic expansion valve, and the indoor electronic expansion valve is arranged correspondingly to each indoor heat exchanger.

[0157] The control method of the air conditioner further comprises:

[0158] When the exhaust gas temperature is greater than or equal to a fourth temperature threshold, or the opening degree of at least two indoor electronic expansion valves is greater than or equal to a preset initial opening degree, the opening degree of the main road electronic expansion valve is periodically increased by a preset second step length, the fourth temperature threshold is greater than the third temperature threshold, and the preset second step length is less than the preset first step length.

[0159] Since there can be multiple air conditioner indoor units connected with the running outdoor heat exchanger in the refrigeration mode, when the heating mode is started, if the temperature of the compressor is relatively high, or the opening degree of the indoor electronic expansion valve in multiple air conditioner indoor units is greater than the initial opening degree, it indicates that the flow rate of the refrigerant needs to be accelerated at this time, and the heat exchange effect needs to be improved, that is, the main road electronic expansion valve increases by 20 steps every period based on the calculation of the opening degree change, and cannot be reduced; once this control is entered, when the exhaust gas temperature of the compressor is less than 95℃, or the opening degree of the indoor electronic expansion valve in the system is less than a preset opening degree threshold, the value range of the preset opening degree threshold is 1-100, which is not limited in this embodiment.

[0160] The application also provides a control device of an air conditioner, please refer to FIG. 7, the control device of the air conditioner comprises:

[0161] The acquisition module 10 is used for acquiring the target supercooling degree and the actual supercooling degree of each condensing component in the air conditioner when the air conditioner simultaneously exists in the refrigeration and heating water modes.

[0162] The adjusting module 20 is configured to adjust the opening degree of the electronic expansion valve in the flow path of each condensing component according to the target supercooling degree and the actual supercooling degree.

[0163] In an embodiment, the adjusting module 20 is further configured to obtain a first outlet refrigerant temperature of the heating water tank, a water tank water temperature, and a discharge pressure of the compressor; determine an actual supercooling degree of the heating water tank according to a saturation temperature corresponding to the first outlet refrigerant temperature and the discharge pressure, and query a target supercooling degree of the heating water tank based on the water tank water temperature; and the adjusting of the opening degree of the electronic expansion valve in the flow path of each condensing component according to the target supercooling degree and the actual supercooling degree comprises adjusting the opening degree of the branch electronic expansion valve according to the target supercooling degree and the actual supercooling degree of the heating water tank.

[0164] In an embodiment, the adjusting module 20 is further configured to determine a first opening degree change value according to the target supercooling degree and the actual supercooling degree of the heating water tank; and adjust the opening degree of the branch electronic expansion valve according to the first opening degree change value.

[0165] In an embodiment, the adjusting module 20 is further configured to, when the first opening degree change value is greater than a first opening degree threshold, correct the first opening degree change value according to a first coefficient, and adjust the opening degree of the branch electronic expansion valve according to the corrected first opening degree change value; and when the first opening degree change value is less than or equal to the first opening degree threshold, correct the first opening degree change value according to a second coefficient, and adjust the opening degree of the branch electronic expansion valve according to the corrected first opening degree change value, the second coefficient being less than the first coefficient.

[0166] In an embodiment, the adjusting module 20 is further configured to, when the saturation temperature is greater than or equal to a first temperature threshold and for a first duration, control the opening degree of the branch electronic expansion valve to be increased or maintained unchanged; and when the air conditioner satisfies a preset electric heating condition, periodically reduce the opening degree of the branch electronic expansion valve based on a preset first step.

[0167] In an embodiment, the adjusting module 20 is further configured to obtain a second outlet refrigerant temperature of the outdoor heat exchanger, an outdoor ambient temperature of a region where the outdoor heat exchanger is located, and a discharge pressure of the compressor; determine an actual supercooling degree of the outdoor heat exchanger according to a saturation temperature corresponding to the second outlet refrigerant temperature and the discharge pressure, and query a target supercooling degree of the outdoor heat exchanger based on the outdoor ambient temperature; and the adjusting of the opening degree of the electronic expansion valve in the flow path of each condensing component according to the target supercooling degree and the actual supercooling degree further comprises adjusting the opening degree of the main-path electronic expansion valve according to the target supercooling degree and the actual supercooling degree of the outdoor heat exchanger.

[0168] In an embodiment, the adjustment module 20 is further configured to determine a second opening degree change value according to the target supercooling degree and the actual supercooling degree of the outdoor heat exchanger; and adjust the opening degree of the main electronic expansion valve according to the second opening degree change value.

[0169] In an embodiment, the adjustment module 20 is further configured to, when the second opening degree change value is greater than a second opening degree threshold value, correct the second opening degree change value according to a third coefficient, and adjust the opening degree of the main electronic expansion valve according to the corrected second opening degree change value, the second opening degree threshold value being greater than the first opening degree threshold value; when the second opening degree change value is less than or equal to the second opening degree threshold value and greater than a third opening degree threshold value, maintain the opening degree of the main electronic expansion valve unchanged; and when the second opening degree change value is less than or equal to the third opening degree threshold value, correct the first opening degree change value according to a fourth coefficient, and adjust the opening degree of the main electronic expansion valve according to the corrected second opening degree change value, the fourth coefficient being less than the third coefficient, and the third opening degree threshold value being less than the first opening degree threshold value.

[0170] In an embodiment, the adjustment module 20 is further configured to adjust the opening degree of the sub-electronic expansion valve based on a preset initial opening degree, and maintain the preset time length.

[0171] In an embodiment, the adjustment module 20 is further configured to obtain the discharge temperature of the compressor; when the discharge temperature is greater than a second temperature threshold value for a second time length, control the opening degree of the sub-electronic expansion valve to increase or remain unchanged until the discharge temperature is less than or equal to the second temperature threshold value, the second time length being less than the first time length, and the first temperature threshold value being less than the second temperature threshold value.

[0172] In an embodiment, the adjustment module 20 is further configured to, when the discharge temperature is greater than a third temperature threshold value for a second time length, increase the opening degree of the sub-electronic expansion valve based on a preset first step length, the second temperature threshold value being less than the third temperature threshold value; periodically increase the opening degree of the sub-electronic expansion valve based on the preset first step length until the opening degree of the sub-electronic expansion valve reaches a maximum opening degree, or the discharge temperature is less than or equal to the second temperature threshold value for the second time length.

[0173] In an embodiment, the adjustment module 20 is further configured to, when the discharge temperature is greater than or equal to a fourth temperature threshold value, or the opening degree of at least two indoor electronic expansion valves is greater than or equal to a preset initial opening degree, periodically increase the opening degree of the main electronic expansion valve based on a preset second step length, the fourth temperature threshold value being greater than the third temperature threshold value, and the preset second step length being less than the preset first step length.

[0174] The embodiment obtains target supercooling degrees and actual supercooling degrees of each condensing component in the air conditioner when the air conditioner simultaneously exists refrigeration and heating water modes, adjusts the opening degree of the electronic expansion valve in the flow path of each condensing component according to the target supercooling degrees and the actual supercooling degrees, and determines the heat exchange requirement of each condensing component according to the actual supercooling degrees and the target supercooling degrees of different condensing components, so as to adjust the opening degree of the electronic expansion valve in the flow path of the condensing component, realize accurate distribution of refrigerant in the air conditioner, improve the heat exchange efficiency of the air conditioner, avoid the technical problem that the air conditioner has low energy efficiency due to unreasonable distribution of refrigerant when heating and heating water are simultaneously performed in the multi-split air conditioner in the prior art, and improve the use energy efficiency of the air conditioner.

[0175] The control device of the air conditioner provided in the application adopts the control method of the air conditioner in the above embodiment, and can solve the technical problem of control of the air conditioner. Compared with the prior art, the control device of the air conditioner provided in the application has the same beneficial effects as the control method of the air conditioner provided in the above embodiment, and other technical features in the control device of the air conditioner are the same as the features disclosed in the above embodiment, which will not be described herein.

[0176] The application provides an air conditioner, which comprises at least one processor and a memory connected with the at least one processor in communication, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the control method of the air conditioner in the above embodiment one.

[0177] Reference is made to FIG. 8, which shows a structural schematic diagram of an air conditioner suitable for implementing the embodiments of the application. The air conditioner in the embodiments of the application can include, but is not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (Personal Digital Assistant), PADs (Portable Application Description), PMPs (Portable Media Player), vehicle-mounted terminals (for example, vehicle-mounted navigation terminals), and the like, and fixed terminals such as digital TVs, desktop computers, and the like. The air conditioner shown in FIG. 8 is only an example, and should not bring any limitation to the functions and use range of the embodiments of the application.

[0178] As shown in FIG. 8, the air conditioner can include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.) that can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. In the RAM 1004, various programs and data required for operation of the air conditioner are also stored. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; the storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the air conditioner to communicate with other devices wirelessly or wired to exchange data. Although the air conditioner with various systems is shown in the drawing, it should be understood that all of the shown systems are not required to be implemented or provided. More or less systems can be alternatively implemented or provided.

[0179] According to embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as a computer software program. For example, embodiments disclosed in the present application include a computer program product including a computer program carried on a computer readable medium, the computer program containing program codes for executing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network through the communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the methods of the embodiments disclosed in the present application are executed.

[0180] The air conditioner provided in the present application adopts the control method of the air conditioner in the above-mentioned embodiments, and can solve the technical problem of the control of the air conditioner. Compared with the prior art, the air conditioner provided in the present application has the same beneficial effects as the control method of the air conditioner provided in the above-mentioned embodiments, and other technical features in the air conditioner are the same as the features disclosed in the above-mentioned embodiments, which will not be described here.

[0181] It should be understood that parts of the present application can be realized by hardware, software, firmware or a combination thereof. In the description of the above-mentioned embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0182] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0183] The present application provides a computer readable storage medium having stored thereon computer readable program instructions (i.e. computer programs) for performing the control method of the air conditioner in the above embodiment.

[0184] The computer readable storage medium provided by the present application may, for example, be a U disk, but is not limited to an electric, magnetic, optical, electromagnetic, infrared, or semiconductor system, system or device, or any combination of the above. More specific examples of the computer readable storage medium can include, but are not limited to, an electric connection having one or more conductive wires, a portable computer disk, a hard disk, a random access memory (RAM), a read only memory (ROM), an erasable programmable read only memory (EPROM or flash memory), an optical fiber, a portable compact disk read only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present embodiment, the computer readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer readable storage medium can be transmitted by any suitable medium, including but not limited to an electric wire, an optical cable, an RF (Radio Frequency), etc., or any suitable combination of the above.

[0185] The above computer readable storage medium can be contained in the air conditioner; or can exist separately without being assembled into the air conditioner.

[0186] The above computer readable storage medium carries one or more programs, which, when executed by the air conditioner, cause the air conditioner to perform the control of the air conditioner.

[0187] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0188] The flow diagrams and the block diagrams in the drawings are illustrations of architectures, functionalities, and operations of possible implementations of systems, methods, and computer program products according to various embodiments of the present application. In this regard, each block in the flow diagrams or block diagrams can represent a module, a segment, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the blocks can occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or the blocks may

[0189] The modules involved in the embodiments of the present application can be implemented in the form of software or in the form of hardware. In some cases, the name of the module does not constitute a limitation on the module itself.

[0190] The readable storage medium provided by the present application is a computer readable storage medium, which stores computer readable program instructions (i.e., a computer program) for executing the control method of the air conditioner, and can solve the technical problem of the control of the air conditioner. Compared with the prior art, the computer readable storage medium provided by the present application has the same beneficial effects as the control method of the air conditioner provided by the above-mentioned embodiments, and will not be described here.

[0191] The application further provides a computer program product comprising a computer program which, when executed by a processor, implements the steps of the control method of the air conditioner.

[0192] The computer program product provided by the application can solve the technical problem of air conditioner control. Compared with the prior art, the computer program product provided by the application has the same beneficial effects as the air conditioner control method provided by the above-mentioned embodiments, and will not be described here.

[0193] The above-mentioned is only part of the embodiments of the application, and does not limit the patent scope of the application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or direct / indirect application in other related technical fields based on the technical concept of the application and the content of the specification and drawings are included in the patent protection scope of the application.

Claims

1. A control method for an air conditioner, wherein, The air conditioner control method is applied to a multi-split air conditioner, which includes an outdoor unit, at least one indoor unit, and a domestic hot water device. The outdoor unit is connected to each indoor unit and the domestic hot water device. The outdoor unit includes a compressor, an outdoor heat exchanger, a reversing device, and a main electronic expansion valve. The indoor unit includes an indoor heat exchanger, and the domestic hot water device includes a hot water tank and branch electronic expansion valves. The control method for the air conditioner includes: When the air conditioner is simultaneously in cooling and hot water modes, the target subcooling and actual subcooling of each condenser component in the air conditioner are obtained; and Adjust the opening degree of the electronic expansion valve in the flow path of each condensing component according to the target subcooling degree and the actual subcooling degree.

2. The control method for an air conditioner as described in claim 1, wherein, The condensing component of the air conditioner includes at least a hot water tank, and the electronic expansion valve in the flow path of the hot water tank is a branch electronic expansion valve; The process of obtaining the target subcooling and actual subcooling of each condenser component in the air conditioner includes: The refrigerant temperature at the first outlet of the hot water tank, the water temperature in the tank, and the discharge pressure of the compressor are obtained. The actual subcooling of the hot water tank is determined based on the saturation temperature corresponding to the first outlet refrigerant temperature and the exhaust pressure, and the target subcooling of the hot water tank is queried based on the water temperature in the tank; and The step of adjusting the opening degree of the electronic expansion valves in the flow paths of each condensing component according to the target subcooling degree and the actual subcooling degree includes: Adjust the opening degree of the branch electronic expansion valve according to the target subcooling degree and the actual subcooling degree of the hot water tank.

3. The control method for an air conditioner as described in claim 2, wherein, The step of adjusting the opening of the branch electronic expansion valve according to the target subcooling degree and the actual subcooling degree of the hot water tank includes: The first opening change value is determined based on the target subcooling degree and the actual subcooling degree of the hot water tank; The opening degree of the branch electronic expansion valve is adjusted according to the first opening degree change value.

4. The control method for an air conditioner as described in claim 3, wherein, The step of adjusting the opening of the branch electronic expansion valve according to the first opening change value includes: When the first opening change value is greater than the first opening threshold, the first opening change value is corrected according to the first coefficient, and the opening of the branch electronic expansion valve is adjusted according to the corrected first opening change value; and When the first opening change value is less than or equal to the first opening threshold, the first opening change value is corrected according to the second coefficient, and the opening of the branch electronic expansion valve is adjusted according to the corrected first opening change value, wherein the second coefficient is less than the first coefficient.

5. The control method for an air conditioner as described in claim 2, wherein, The control method for the air conditioner further includes: During a sustained first duration, when the saturation temperature is greater than or equal to a first temperature threshold, the opening degree of the shunt electronic expansion valve is controlled to increase or remain unchanged; and When the air conditioner meets the preset electric heating conditions, the opening degree of the branch electronic expansion valve is reduced periodically based on the preset first step.

6. The control method for an air conditioner as described in claim 1, wherein, The condensing component of the air conditioner also includes an outdoor heat exchanger, and the electronic expansion valve in the flow path of the outdoor heat exchanger is the main electronic expansion valve. The process of obtaining the target subcooling and actual subcooling of each condenser component in the air conditioner further includes: The refrigerant temperature at the second outlet of the outdoor heat exchanger, the outdoor ambient temperature of the area where the outdoor heat exchanger is located, and the discharge pressure of the compressor are obtained. The actual subcooling of the outdoor heat exchanger is determined based on the saturation temperature corresponding to the exhaust pressure at the second outlet refrigerant temperature, and the target subcooling of the outdoor heat exchanger is queried based on the outdoor ambient temperature; and The step of adjusting the opening of the electronic expansion valves in the flow paths of each condensing component according to the target subcooling and the actual subcooling also includes: Adjust the opening of the main electronic expansion valve according to the target subcooling and actual subcooling of the outdoor heat exchanger.

7. The control method for an air conditioner as described in claim 6, wherein, The step of adjusting the opening of the main electronic expansion valve according to the target subcooling and actual subcooling of the outdoor heat exchanger includes: The second opening change value is determined based on the target subcooling and actual subcooling of the outdoor heat exchanger; and The opening of the main electronic expansion valve is adjusted according to the second opening change value.

8. The control method for an air conditioner as described in claim 7, wherein, The step of adjusting the opening of the main electronic expansion valve according to the second opening change value includes: When the second opening change value is greater than the second opening threshold, the second opening change value is corrected according to the third coefficient, and the opening of the main electronic expansion valve is adjusted according to the corrected second opening change value, wherein the second opening threshold is greater than the first opening threshold. When the second opening change value is less than or equal to the second opening threshold and greater than the third opening threshold, the opening of the main electronic expansion valve is kept constant; and When the second opening change value is less than or equal to the third opening threshold, the first opening change value is corrected according to the fourth coefficient, and the opening of the main electronic expansion valve is adjusted according to the corrected second opening change value. The fourth coefficient is less than the third coefficient, and the third opening threshold is less than the first opening threshold.

9. The control method for an air conditioner as described in claim 1, wherein, Before adjusting the opening degree of the electronic expansion valve in each flow path of the condensing component according to the target subcooling degree and the actual subcooling degree, the control method of the air conditioner further includes: The opening of the branch electronic expansion valve is adjusted based on a preset initial opening and maintained for a preset duration.

10. The control method for an air conditioner as described in claim 1, wherein, The control method for the air conditioner further includes: Obtain the discharge temperature of the compressor; and During the second duration, when the exhaust temperature is greater than the second temperature threshold, the opening of the branch electronic expansion valve is controlled to increase or remain unchanged until the exhaust temperature is less than or equal to the second temperature threshold. Wherein, the second duration is less than the first duration, and the first temperature threshold is less than the second temperature threshold.

11. The control method for an air conditioner as described in claim 10, wherein, The control method for the air conditioner further includes: During the second duration, when the exhaust temperature is greater than the third temperature threshold, the branch electronic expansion valve is raised based on a preset first step duration, where the second temperature threshold is less than the third temperature threshold; and Based on the preset first step of periodically increasing the opening of the branch electronic expansion valve until the opening of the branch electronic expansion valve reaches the maximum opening, or within a second duration, the exhaust temperature is less than or equal to a second temperature threshold.

12. The control method for an air conditioner as described in claim 10, wherein, The indoor unit of the air conditioner also includes an indoor electronic expansion valve, which is correspondingly set with each indoor heat exchanger; The control method for the air conditioner further includes: When the exhaust temperature is greater than or equal to the fourth temperature threshold, or when the opening of at least two indoor electronic expansion valves is greater than or equal to the preset initial opening, the opening of the main electronic expansion valve is periodically increased based on the preset second step length, wherein the fourth temperature threshold is greater than the third temperature threshold, and the preset second step length is less than the preset first step length.

13. A control device for an air conditioner, wherein, The control device for the air conditioner includes: The acquisition module is used to acquire the target subcooling degree and actual subcooling degree of each condenser component in the air conditioner when the air conditioner is simultaneously in cooling and hot water modes; and The adjustment module is used to adjust the opening degree of the electronic expansion valve in the flow path of each condensing component according to the target subcooling degree and the actual subcooling degree.

14. An air conditioner, wherein, The air conditioner includes: a memory, a processor, and a control program for the air conditioner stored in the memory and executable on the processor, the control program being configured to implement the control method for the air conditioner as described in any one of claims 1 to 12.

15. A storage medium, wherein, The storage medium stores a control program for an air conditioner, which, when executed by a processor, implements the control method for an air conditioner as described in any one of claims 1 to 12.

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