CN112944614A - Control method of air conditioner and air conditioner - Google Patents
Control method of air conditioner and air conditioner Download PDFInfo
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- CN112944614A CN112944614A CN202110226646.1A CN202110226646A CN112944614A CN 112944614 A CN112944614 A CN 112944614A CN 202110226646 A CN202110226646 A CN 202110226646A CN 112944614 A CN112944614 A CN 112944614A
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- expansion valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to an air conditioner and a control method thereof. The air conditioner has an expansion valve equipped with a variable pulse width valve driving device, and the control method of the air conditioner includes: opening the expansion valve to an initial opening degree; detecting the temperature of an evaporator coil of the air conditioner; determining whether the expansion valve is in a stuck state based on the evaporator coil temperature; when the expansion valve is determined to be in a stuck state, the pulse width of the valve driving device is increased to open the expansion valve from an initial opening degree to a maximum opening degree, then the expansion valve is closed to a zero opening degree, and then the expansion valve is restored to the initial opening degree. The control method can overcome the problem of jamming caused by insufficient torque.
Description
Technical Field
The invention relates to an air conditioner system, in particular to a control method of an air conditioner and the air conditioner.
Background
Air conditioners generally include a compressor, a condensing unit, an expansion unit, and an evaporation unit, wherein a compression process of a refrigerant is performed by the compressor. The compressor sucks low-temperature and low-pressure gas refrigerant through the air suction end, then compresses the low-temperature and low-pressure gas refrigerant into high-temperature and high-pressure gas refrigerant, and discharges the compressed high-temperature and high-pressure gas refrigerant through the air discharge end. In a refrigeration mode, the high-temperature and high-pressure gas is condensed to a high-temperature and high-pressure liquid refrigerant through an outdoor heat exchanger; the liquid refrigerant of high temperature and high pressure is throttled to the liquid refrigerant of low temperature and low pressure by the expansion valve and then flows into the corresponding indoor evaporator (therefore, a pipe extending from the expansion valve to the indoor heat exchanger is referred to as a "liquid pipe" or an inlet pipe); the low-temperature and low-pressure liquid refrigerant is evaporated into a low-temperature and low-pressure gas refrigerant in the indoor heat exchanger and discharged through an outlet pipe (therefore, the outlet pipe may be referred to as a "gas pipe") of the indoor heat exchanger; the low-temperature and low-pressure gas refrigerant discharged from the indoor heat exchanger is finally sucked by the compressor and compressed into high-temperature and high-pressure gas, thereby starting a new cycle.
In order to better control the energy regulation of air conditioners, existing air conditioners, in particular household air conditioners, are often equipped with an electronic expansion valve. Fig. 1 shows a structure of a conventional electronic expansion valve. As shown in fig. 1, the electronic expansion valve includes a tubular housing 1, a valve seat 5 in the housing 1, a bearing housing 3, a bearing 10, and a boss 4 disposed in the valve seat 5 to be engaged with each other, a sleeve 14 above the bearing housing 3, a valve rotor 12 disposed in the sleeve 14, a lead screw 2 extending through the center of the valve rotor 12, a valve needle 6 below the lower end of the lead screw 12, a valve needle spring 11 fitted over the valve needle 6, and nipples 7, 8 connected to the housing 1. The communication between the connecting pipes 7, 8 is controlled by the valve needle 6. The upper end of the screw rod 2 is connected with a sleeve 14 in a sliding way through a nut 13. A steel ball 9 is arranged between the lower end of the screw rod 2 and the upper end of the valve needle 6. By energizing the coils (not shown) of the electronic expansion valve, the coils convert the electrical energy into a magnetic field that drives the valve body rotor 12 to rotate. The valve rotor 12 drives the valve needle 6 to move up and down to control the opening degree of the electronic expansion valve, thereby performing flow control. When the air conditioner is shut down, the expansion valve is closed completely, and the air conditioner usually has several more steps. When the air conditioner is restarted, the electronic expansion valve is blocked or not opened sometimes, so that the refrigeration/heating effect of the air conditioner is ineffective, and even the system is shut down when a fault is reported. One of the reasons for such a stuck or unopened condition is because the torque to open the expansion valve is insufficient, which in turn leads to a malfunction.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, i.e., to solve the technical problem of the conventional electronic expansion valve being stuck due to insufficient torque, the present invention provides a control method of an air conditioner having an expansion valve equipped with a valve driving device of variable pulse width, the control method comprising:
opening the expansion valve to an initial opening degree;
detecting an evaporator coil temperature of the air conditioner;
determining whether the expansion valve is in a stuck state based on the evaporator coil temperature;
when the expansion valve is determined to be in the stuck state, the pulse width of the valve driving device is increased to open the expansion valve from the initial opening degree to the maximum opening degree, then the expansion valve is closed to the zero opening degree, and then the expansion valve is restored to the initial opening degree.
As can be understood by those skilled in the art, in the control method of the air conditioner of the present invention, after the air conditioner is turned on and the valve driving device opens the expansion valve to the initial opening degree at a fast initial frequency, it is determined whether the expansion valve is in a stuck state or not by the detected temperature of the evaporator coil. In order to control the opening degree of the expansion valve according to the load of the air conditioner, temperature sensors are generally disposed on both the inlet and outlet pipes of the evaporator to measure the temperatures on the inlet and outlet pipes. The temperature on both the inlet and outlet tubes is referred to as the "evaporator coil temperature". Therefore, whether the expansion valve is in the stuck state or not is determined based on the temperature of the evaporator coil, and an additional detection device is not required. Once it is determined that the expansion valve is in a stuck state, the control method increases the torque for opening the expansion valve by increasing the pulse width (and thus the driving frequency) of the valve driving device to open the expansion valve from the initial opening degree to the maximum opening degree, so that the problem that the expansion valve cannot be opened due to insufficient torque can be overcome. Then, the control method closes the expansion valve to the zero opening degree so as to use the zero opening degree as a control reference point of the opening degree of the expansion valve. The control method then returns the expansion valve from a zero opening to the initial opening so that the regulating effect of the expansion valve can be verified by measuring the evaporator coil temperature.
In a preferred embodiment of the control method of the air conditioner, the step of determining whether the expansion valve is in a stuck state based on the temperature of the evaporator coil includes:
comparing the evaporator coil temperature to a predetermined temperature range;
and when the temperature of the evaporator coil exceeds the preset temperature range and lasts for a preset time period, determining that the expansion valve is in a stuck state. The expansion valve is determined to be stuck only when the evaporator coil temperature exceeds the predetermined temperature range for a predetermined period of time to improve the reliability of such determination.
In a preferred technical solution of the control method of the air conditioner, when the air conditioner is started and cooled, when the temperature of the evaporator coil is greater than a maximum set temperature and continues for the predetermined time period, it is determined that the expansion valve is in a stuck state.
In a preferred technical solution of the control method of the air conditioner, when the air conditioner is started to heat, when the temperature of the evaporator coil is less than a minimum set temperature and continues for the predetermined time period, it is determined that the expansion valve is in a stuck state.
In a preferred embodiment of the control method of the air conditioner, the temperature of the evaporator coil of the air conditioner is detected again after the expansion valve returns to the initial opening degree.
In a preferred embodiment of the control method of the air conditioner, the pulse width of the valve driving device is returned to an initial frequency after the expansion valve is returned to the initial opening degree. Within the specification range of the expansion valve, the larger the pulse width, the larger the torque thereof, but the lower the frequency thereof. The operating speed of the expansion valve is proportional to the frequency, i.e. the higher the frequency, the faster the valve opening and closing speed and vice versa. Thus, restoring the pulse width to a faster initial frequency helps to increase the valve opening speed.
In a preferred embodiment of the control method of the air conditioner, when the air conditioner is started and cooled, the temperature of the evaporator coil is detected at an outlet close to the expansion valve; and detecting the temperature of the evaporator coil at an outlet close to the evaporator when the air conditioner is started to heat.
In order to solve the above-mentioned problems in the prior art, i.e. to solve the technical problem of the prior art that an electronic expansion valve is stuck due to insufficient torque, the present invention also provides an air conditioner having an expansion valve equipped with a valve driving device of variable pulse width and a control device configured to implement the control method of the air conditioner according to any one of the above, and comprising:
a coil temperature detection module configured to detect the evaporator coil temperature; and
a main control processing unit configured to determine whether the expansion valve is in a stuck state based on the evaporator coil temperature, and when the expansion valve is in the stuck state, the main control processing unit is configured to control the valve driving device to open the expansion valve from the initial opening degree to the maximum opening degree with an increased pulse width, to close the expansion valve to the zero opening degree, and to restore the expansion valve to the initial opening degree. The torque for opening the expansion valve is increased by the increased pulse width, so that the problem that the expansion valve cannot be opened due to insufficient torque can be overcome.
In a preferred technical solution of the above air conditioner, the main control processing unit is configured to: the evaporator coil temperature is compared to a predetermined temperature range and it is determined that the expansion valve is in a stuck state when the evaporator coil temperature exceeds the predetermined temperature range for a predetermined period of time.
In a preferred technical solution of the above air conditioner, the main control processing unit is configured to:
when the air conditioner is started for refrigeration, when the temperature of the evaporator coil is higher than the maximum set temperature and continues for the preset time period, determining that the expansion valve is in a stuck state; or
When the air conditioner is started to heat, when the temperature of the evaporator coil is less than the minimum set temperature and continues for the preset time period, the expansion valve is judged to be in a blocking state.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic cross-sectional view of an example of a conventional electronic expansion valve;
fig. 2 is a flowchart of a control method of an air conditioner of the present invention;
fig. 3 is a flowchart of a first embodiment of a control method of an air conditioner of the present invention;
fig. 4 is a flowchart of a second embodiment of a control method of an air conditioner of the present invention;
fig. 5 is a schematic view of a control apparatus of an air conditioner of the present invention.
Reference numerals:
1. a housing; 2. a screw rod; 3. a bearing seat; 4. a shaft sleeve; 5. a valve seat; 6. a valve needle; 7 and 8, connecting pipes; 9. a steel ball; 10. a bearing 10; 11. a valve needle spring; 12. a valve body rotor; 13. a nut; 14. a sleeve; 20. a control device for an air conditioner; 21. a coil temperature detection module; 22. a main control unit CPU; 23. and the expansion valve driving module.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The invention provides a control method of an air conditioner, aiming at solving the technical problem that the existing electronic expansion valve cannot be opened due to insufficient torque. The air conditioner has an expansion valve equipped with a variable pulse width valve driving device, and the control method includes:
opening the expansion valve to an initial opening degree (step S1);
detecting the temperature of an evaporator coil of the air conditioner (step S2);
determining whether the expansion valve is in a stuck state based on the evaporator coil temperature (step S3);
when the expansion valve is determined to be in the stuck state, the pulse width of the valve driving device is increased to open the expansion valve from the initial opening degree to the maximum opening degree, the expansion valve is closed to the zero opening degree, and then the expansion valve is returned to the initial opening degree (step S4). The problem of the expansion valve being stuck due to insufficient torque can be overcome by increasing the pulse width of the valve driving device to increase the torque for opening the valve and to open the expansion valve to the maximum opening degree.
In this context, unless expressly indicated to the contrary, the air conditioner may be any type of air conditioning system, including but not limited to an integral air conditioner, a split air conditioner, or other air conditioning system, so long as the air conditioning system includes an expansion valve having a variable pulse width valve drive. The expansion valve includes, but is not limited to, an electronic expansion valve.
Fig. 2 is a flowchart of a control method of an air conditioner of the present invention. As shown in fig. 2, in the air conditioner control method according to the present invention, after the air conditioner is turned on, the opening degree of the expansion valve needs to be adjusted to the initial opening degree (step S1). The initial opening degree is preset and stored in the control system of the air conditioner. At the same time, the valve driving device opens the expansion valve to the initial opening degree at a faster initial frequency (corresponding to the initial pulse width). In the case that the air conditioner has two functions of cooling and heating, the initial opening degree is divided into a cooling initial opening degree and a heating initial opening degree, which are generally different. After the expansion valve is opened to the initial opening degree, the control method proceeds to step S2. In step S2, the evaporator coil temperature of the air conditioner is detected. The specific location of detection of the evaporator coil temperature is typically different when the air conditioner is cooling and when the air conditioner is heating. For example, in air conditioning cooling, the evaporator coil temperature is measured from a location near the outlet of the expansion valve. In contrast, when the air conditioner is heating, the evaporator coil temperature is measured from the outlet end of the evaporator. Control then proceeds to step S3 where it is determined whether the expansion valve is in a stuck state based on the evaporator coil temperature. When the detected temperature of the evaporator coil is abnormal, such as deviating from the set temperature range, the expansion valve can be judged to be in a stuck state. When the expansion valve is determined to be in the stuck state, the control method proceeds to step S4. In step S4, the pulse width of the valve driving device is increased to open the expansion valve from the initial opening degree to the maximum opening degree, the expansion valve is closed to the zero opening degree, and the expansion valve is returned to the initial opening degree. The expansion valve is closed to zero opening degree and then is restored to the initial opening degree, and the zero opening degree is used as a control reference. After the expansion valve is restored to the initial opening degree, the above-described control process may be repeatedly performed.
Fig. 3 is a flowchart of a control method of an air conditioner according to a first embodiment of the present invention. As shown in fig. 3, in this embodiment, the air conditioner is turned on to perform cooling, and therefore the control method adjusts the opening degree of the expansion valve to the initial opening degree of cooling by the valve driving device at the initial pulse width (corresponding to the faster initial frequency) in step S1 a. After the expansion valve is opened to the initial opening degree for cooling, the control method proceeds to step S2 a. In step S2a, the temperature of the evaporator coil of the air conditioner is detected at a position near the outlet of the expansion valve. Then, the control method proceeds to step S3a, where it is determined that the expansion valve is in a stuck state when the evaporator coil temperature is greater than the maximum set temperature for a predetermined period of time. In the refrigeration cycle, the maximum set temperature is, for example, 19 ℃, 20 ℃, 21 ℃ or other suitable temperature value. The predetermined period of time is, for example, 1.5 minutes, 2 minutes, 2.5 minutes, or other suitable period of time. When the temperature of the evaporator coil exceeds the maximum set temperature range and lasts for a preset time period, the temperature of the evaporator coil is abnormal, and the expansion valve can be judged to be in a stuck state. When the expansion valve is determined to be in the stuck state, the control method proceeds to step S4 a. In step S4a, the pulse width of the valve driving device is increased to open the expansion valve from the initial opening degree to the maximum opening degree, for example, 100pps, the expansion valve is opened to the maximum opening degree, the expansion valve is closed to the zero opening degree, and then the expansion valve is returned to the initial opening degree. After the expansion valve returns to the initial opening degree, the control method proceeds to step 5a, and the valve driving device returns to the initial frequency, so that the expansion valve can be opened at a faster speed.
Fig. 4 is a flowchart of a control method of an air conditioner according to a second embodiment of the present invention. As shown in fig. 4, in this embodiment, the air conditioner is turned on to perform heating, and therefore the control method adjusts the opening degree of the expansion valve to the initial opening degree of heating by the valve driving device at the initial pulse width (corresponding to the faster initial frequency) in step S1 b. After the expansion valve is opened to the initial opening degree for heating, the control method proceeds to step S2 b. In step S2b, the temperature of the evaporator coil of the air conditioner is detected at a position near one end of the evaporator outlet. Then, the control method proceeds to step S3b, where it is determined that the expansion valve is in a stuck state when the evaporator coil temperature is less than the minimum set temperature for a predetermined period of time. In the heating cycle, the minimum set temperature is, for example, 14 ℃, 15 ℃, 16 ℃ or other suitable temperature value. The predetermined period of time is, for example, 1.5 minutes, 2 minutes, 2.5 minutes, or other suitable period of time. When the temperature of the evaporator coil is lower than the minimum set temperature range and lasts for a preset time period, the temperature of the evaporator coil is abnormal, and the expansion valve can be judged to be in a stuck state. When the expansion valve is determined to be in the stuck state, the control method proceeds to step S4 b. In step S4b, the pulse width of the valve driving device is increased, for example, 100pps, to open the expansion valve from the initial opening degree to the maximum opening degree, the expansion valve is closed to the zero opening degree, and then the expansion valve is returned to the initial opening degree. The expansion valve is closed to zero opening degree and then is restored to the initial opening degree, and the zero opening degree is used as a control reference. After the expansion valve returns to the initial opening degree, the control method proceeds to step 5b, and the valve driving device returns to the initial frequency, so that the expansion valve can be opened at a faster speed.
Fig. 5 is a schematic view of a control apparatus of an air conditioner of the present invention. As shown in fig. 5, the control device 20 of the air conditioner includes a coil temperature detection module 21, a main control unit CPU22 (i.e., a main control processing unit), and an expansion valve driving module 23 (also referred to as a valve driving device). The coil temperature detection module 21 is configured to detect the evaporator coil temperature and can detect the evaporator coil temperature at the two locations described above, i.e., at a location near the outlet of the expansion valve and at a location near one end of the evaporator outlet. The main control unit CPU22 is configured to determine whether the expansion valve is in a stuck state based on the evaporator coil temperature, and when the expansion valve is in a stuck state, the main control processing unit is configured to control the expansion valve drive module 23 to first open the expansion valve from an initial opening degree to a maximum opening degree with an increased pulse width, then close the expansion valve to a zero opening degree, and then restore the expansion valve to the initial opening degree. The torque for opening the expansion valve is increased by the increased pulse width, so that the problem that the expansion valve cannot be opened due to insufficient torque can be overcome. In one or more embodiments, the expansion valve driving module 23 may be directly driven by an MCU (micro control unit), and typically will have a motor driving chip. Alternatively, the expansion valve driving module 23 may also be an external driving module for controlling the action of the expansion valve.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method of an air conditioner having an expansion valve equipped with a valve driving device of variable pulse width, comprising:
opening the expansion valve to an initial opening degree;
detecting an evaporator coil temperature of the air conditioner;
determining whether the expansion valve is in a stuck state based on the evaporator coil temperature;
when the expansion valve is determined to be in the stuck state, the pulse width of the valve driving device is increased to open the expansion valve from an initial opening degree to a maximum opening degree, then the expansion valve is closed to a zero opening degree, and then the expansion valve is restored to the initial opening degree.
2. The control method of an air conditioner according to claim 1, wherein the step of determining whether the expansion valve is in a stuck state based on the evaporator coil temperature includes:
comparing the evaporator coil temperature to a predetermined temperature range;
and when the temperature of the evaporator coil exceeds the preset temperature range and lasts for a preset time period, determining that the expansion valve is in a stuck state.
3. The control method of an air conditioner according to claim 2, wherein it is determined that the expansion valve is in a stuck state when the evaporator coil temperature is greater than a maximum set temperature for the predetermined period of time at the time of starting and cooling of the air conditioner.
4. The method as claimed in claim 2, wherein it is determined that the expansion valve is in a stuck state when the evaporator coil temperature is less than a minimum set temperature for the predetermined period of time while the air conditioner is powered on for heating.
5. The control method of an air conditioner according to any one of claims 1 to 4, wherein an evaporator coil temperature of the air conditioner is re-detected after the expansion valve is restored to the initial opening degree.
6. The control method of an air conditioner according to any one of claims 1 to 4, wherein the pulse width of the valve driving means is returned to an initial frequency after the expansion valve is returned to the initial opening degree.
7. The control method of an air conditioner according to claim 1, wherein the evaporator coil temperature is detected near an outlet of the expansion valve at the time of starting and cooling of the air conditioner; and detecting the temperature of the evaporator coil at an outlet close to the evaporator when the air conditioner is started to heat.
8. An air conditioner having an expansion valve equipped with a valve driving device of variable pulse width and a control device configured to implement the control method of the air conditioner according to any one of claims 1 to 7, and comprising:
a coil temperature detection module configured to detect the evaporator coil temperature; and
a main control processing unit configured to determine whether the expansion valve is in a stuck state based on the evaporator coil temperature, and when the expansion valve is in the stuck state, the main control processing unit is configured to control the valve driving device to open the expansion valve from the initial opening degree to the maximum opening degree with an increased pulse width, to close the expansion valve to the zero opening degree, and to restore the expansion valve to the initial opening degree.
9. The air conditioner of claim 8, wherein the master processing unit is configured to: the evaporator coil temperature is compared to a predetermined temperature range and it is determined that the expansion valve is in a stuck state when the evaporator coil temperature exceeds the predetermined temperature range for a predetermined period of time.
10. The air conditioner of claim 9, wherein the master processing unit is configured to:
when the air conditioner is started for refrigeration, when the temperature of the evaporator coil is higher than the maximum set temperature and continues for the preset time period, determining that the expansion valve is in a stuck state; or
When the air conditioner is started to heat, when the temperature of the evaporator coil is less than the minimum set temperature and continues for the preset time period, the expansion valve is judged to be in a blocking state.
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| CN202110226646.1A CN112944614A (en) | 2021-03-01 | 2021-03-01 | Control method of air conditioner and air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117387192A (en) * | 2023-11-23 | 2024-01-12 | 宜所(广东)智能科技有限公司 | Control method and system for electronic expansion valve of air conditioner |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117387192A (en) * | 2023-11-23 | 2024-01-12 | 宜所(广东)智能科技有限公司 | Control method and system for electronic expansion valve of air conditioner |
| CN117387192B (en) * | 2023-11-23 | 2024-04-16 | 宜所(广东)智能科技有限公司 | Control method and system for electronic expansion valve of air conditioner |
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