Air conditioner and control method and device thereof, storage medium and computer program product

Abstract

The invention discloses an air conditioner control method and device, an air conditioner, a storage medium and a computer program product.The method comprises the steps that when the air conditioner runs, whether an exhaust temperature sensor used for detecting the exhaust temperature of a compressor falls off or not is judged according to the opening degree of an electronic expansion valve, and if it is determined that the exhaust temperature sensor falls off, the air conditioner is controlled to stop; if it is determined that the exhaust temperature sensor does not fall off, whether the detection result of the exhaust temperature sensor has deviation or not is judged according to the actually-measured exhaust temperature and the temperature of the refrigerant inlet of the condenser, and after it is determined that the detection result of the exhaust temperature sensor has deviation, the opening degree of the electronic expansion valve is controlled according to the compressor frequency and the outdoor temperature. According to the scheme, by detecting whether the exhaust temperature sensor falls off or not and detecting result deviation, when the sensor falls off, the air conditioner is controlled to stop to avoid damage to the air conditioner, when the detecting result deviation occurs, the opening degree of the electronic expansion valve is adjusted, high-temperature failure damage to the compressor is avoided, and the system operation effect and reliability are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and in particular relates to a control method and device for an air conditioner, an air conditioner, a storage medium, and a computer program product. Background Art

[0002] During the installation and after-sales maintenance of the air conditioner, the exhaust temperature sensor may not be properly assembled or may be missed. In some cases, vibration may occur during the transportation of the air conditioner, causing the exhaust temperature sensor to fall off, resulting in a deviation between the detected exhaust temperature and the actual exhaust temperature, thereby affecting the system operation effect and causing the compressor to fail and be damaged by high temperature.

[0003] Related solutions use the change amplitude of the exhaust temperature sensor per unit time to determine whether the exhaust temperature sensor is abnormal. However, during actual operation, the load size and operating time of the air-conditioning system will affect the change amplitude of the exhaust temperature sensor, resulting in the air-conditioning system being unable to accurately determine whether the exhaust temperature sensor has failed.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The object of the present invention is to provide an air conditioner control method, device, air conditioner, storage medium and computer program product to solve the problem of failure of the exhaust temperature sensor of the air conditioner in related solutions, thereby affecting the system operation effect and causing high-temperature failure of the compressor. The method can detect whether the exhaust temperature sensor is detached and the detection result is deviant, and control the air conditioner to shut down when the sensor is detached to avoid damage to the air conditioner. When the detection result deviates, the opening of the electronic expansion valve is adjusted to avoid high-temperature failure and damage to the compressor, thereby improving the system operation effect and reliability.

[0006] The present invention provides a control method for an air conditioner, which includes an evaporator, a condenser, an electronic expansion valve, and a compressor; an exhaust temperature sensor for detecting the exhaust temperature of the compressor is provided at the compressor; the method comprises: during the operation of the air conditioner, obtaining the temperature at the refrigerant inlet of the condenser, recorded as the condensing temperature; obtaining the temperature detected by the exhaust temperature sensor, recorded as the measured exhaust temperature; obtaining the opening of the electronic expansion valve, the operating frequency of the compressor, and the outdoor ambient temperature; judging whether the exhaust temperature sensor is detached according to the opening of the electronic expansion valve; if it is determined that the exhaust temperature sensor is detached, controlling the air conditioner to shut down; if it is determined that the exhaust temperature sensor is not detached, judging whether there is a deviation in the detection result of the exhaust temperature sensor according to the measured exhaust temperature and the condensing temperature; if it is determined that there is a deviation in the detection result of the exhaust temperature sensor, controlling the opening of the electronic expansion valve according to the operating frequency of the compressor and the outdoor ambient temperature.

[0007] In some embodiments, the method further includes: before determining whether the exhaust temperature sensor has fallen off, obtaining the temperature at the refrigerant outlet of the evaporator, recorded as the evaporation temperature; determining the magnitude of the evaporation temperature; if the evaporation temperature is greater than the preset evaporation temperature, determining whether the exhaust temperature sensor has fallen off based on the opening of the electronic expansion valve; if the evaporation temperature is less than or equal to the preset evaporation temperature, determining whether there is a deviation in the detection result of the exhaust temperature sensor based on the measured exhaust temperature and the condensation temperature.

[0008] In some embodiments, determining whether the exhaust temperature sensor has fallen off is based on the opening of the electronic expansion valve, including: dividing the difference between the preset opening of the electronic expansion valve and the current opening of the electronic expansion valve by the preset opening of the electronic expansion valve, and recording the result as the opening offset rate; determining the size of the opening offset rate; if the opening offset rate is greater than the preset opening offset rate, and the opening offset rate at the current moment is greater than the opening offset rate at the previous moment, determining that the exhaust temperature sensor has fallen off; if the opening offset rate is less than or equal to the preset opening offset rate, determining that the exhaust temperature sensor has not fallen off.

[0009] In some embodiments, determining whether there is a deviation in the detection result of the exhaust temperature sensor based on the measured exhaust temperature and the condensing temperature includes: determining the size relationship between the measured exhaust temperature and the condensing temperature; if the measured exhaust temperature is less than the condensing temperature, determining that there is a deviation in the detection result of the exhaust temperature sensor; if the measured exhaust temperature is greater than or equal to the condensing temperature, determining that there is no deviation in the detection result of the exhaust temperature sensor.

[0010] In some embodiments, controlling the opening of the electronic expansion valve according to the operating frequency of the compressor and the outdoor ambient temperature includes: controlling the lower limit of the opening of the electronic expansion valve to a preset lower limit value; the preset lower limit value is: P min =K1*f+K2*T 外 +K3; where P min is the preset lower limit value, f is the operating frequency of the compressor, T 外 is the outdoor ambient temperature, and K1, K2, and K3 are all coefficients.

[0011] In some embodiments, the method further includes: if it is determined that there is a deviation in the detection result of the exhaust temperature sensor, correcting the measured exhaust temperature, and controlling the operation of the air conditioner with the corrected measured exhaust temperature; wherein the sum of the measured exhaust temperature and the preset correction temperature is used as the corrected measured exhaust temperature.

[0012] Matching the above method, another aspect of the present invention provides a control device for an air conditioner, the air conditioner comprising an evaporator, a condenser, an electronic expansion valve, and a compressor; the compressor being provided with an exhaust temperature sensor for detecting the exhaust temperature of the compressor; the device comprising: an acquisition unit configured to, during operation of the air conditioner, acquire the temperature at the refrigerant inlet of the condenser, recorded as the condensing temperature; acquire the temperature detected by the exhaust temperature sensor, recorded as the measured exhaust temperature; acquire the opening of the electronic expansion valve, the operating frequency of the compressor, and the outdoor ambient temperature; a control unit configured to determine whether the exhaust temperature sensor is detached based on the opening of the electronic expansion valve; the control unit being further configured to, if it is determined that the exhaust temperature sensor is detached, control the air conditioner to shut down; the control unit being further configured to, if it is determined that the exhaust temperature sensor is not detached, determine whether there is a deviation in the detection result of the exhaust temperature sensor based on the measured exhaust temperature and the condensing temperature; the control unit being further configured to, if it is determined that there is a deviation in the detection result of the exhaust temperature sensor, control the opening of the electronic expansion valve based on the operating frequency of the compressor and the outdoor ambient temperature.

[0013] In some embodiments, the control unit is further configured to obtain the temperature at the refrigerant outlet of the evaporator, recorded as the evaporation temperature, before determining whether the exhaust temperature sensor has fallen off; determine the magnitude of the evaporation temperature; if the evaporation temperature is greater than the preset evaporation temperature, determine whether the exhaust temperature sensor has fallen off based on the opening of the electronic expansion valve; if the evaporation temperature is less than or equal to the preset evaporation temperature, determine whether there is a deviation in the detection result of the exhaust temperature sensor based on the measured exhaust temperature and the condensation temperature.

[0014] In some embodiments, the control unit determines whether the exhaust temperature sensor has fallen off based on the opening of the electronic expansion valve, including: dividing the difference between the preset opening of the electronic expansion valve and the current opening of the electronic expansion valve by the preset opening of the electronic expansion valve, and recording the result as the opening offset rate; determining the size of the opening offset rate; if the opening offset rate is greater than the preset opening offset rate, and the opening offset rate at the current moment is greater than the opening offset rate at the previous moment, determining that the exhaust temperature sensor has fallen off; if the opening offset rate is less than or equal to the preset opening offset rate, determining that the exhaust temperature sensor has not fallen off.

[0015] In some embodiments, the control unit determines whether there is a deviation in the detection result of the exhaust temperature sensor based on the measured exhaust temperature and the condensing temperature, including: determining the size relationship between the measured exhaust temperature and the condensing temperature; if the measured exhaust temperature is lower than the condensing temperature, determining that there is a deviation in the detection result of the exhaust temperature sensor; if the measured exhaust temperature is greater than or equal to the condensing temperature, determining that there is no deviation in the detection result of the exhaust temperature sensor.

[0016] In some embodiments, the control unit controls the opening of the electronic expansion valve according to the operating frequency of the compressor and the outdoor ambient temperature, including: controlling the lower limit of the opening of the electronic expansion valve to a preset lower limit value; the preset lower limit value is: P min =K1*f+K2*T 外 +K3; where P min is the preset lower limit value, f is the operating frequency of the compressor, T 外 is the outdoor ambient temperature, and K1, K2, and K3 are all coefficients.

[0017] In some embodiments, the control unit is further configured to correct the measured exhaust temperature if it is determined that there is a deviation in the detection result of the exhaust temperature sensor, and control the operation of the air conditioner with the corrected measured exhaust temperature; wherein the sum of the measured exhaust temperature and the preset correction temperature is used as the corrected measured exhaust temperature.

[0018] Matching the above device, the present invention further provides an air conditioner, comprising: the control device of the air conditioner described above.

[0019] In accordance with the above method, the present invention further provides a storage medium, which includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned air conditioning control method.

[0020] In accordance with the above method, the present invention further provides a computer program product, which includes a computer program. When the computer program product is processed and executed, the steps of the above air conditioner control method are implemented.

[0021] The solution of the present invention determines whether the exhaust temperature sensor has fallen off based on the electronic expansion valve opening during air conditioning operation. If the exhaust temperature sensor is determined to be fallen off, the air conditioner is shut down. If the exhaust temperature sensor is determined to be intact, the exhaust temperature sensor's detection result is determined to be deviated based on the measured exhaust temperature and the temperature at the refrigerant inlet of the condenser. If the detection result of the exhaust temperature sensor is determined to be deviated, the electronic expansion valve opening is controlled based on the compressor frequency and the outdoor temperature. Thus, by detecting whether the exhaust temperature sensor has fallen off and the detection result is deviated, the air conditioner is shut down if the sensor is fallen off to avoid damage to the air conditioner. If the detection result deviates, the electronic expansion valve opening is adjusted to avoid compressor failure and damage due to high temperature, thereby improving system operation and reliability.

[0022] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0023] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A flow chart of an embodiment of a method for controlling an air conditioner according to the present invention;

[0025] Figure 2 A schematic structural diagram of an embodiment of an air conditioner control device of the present invention;

[0026] Figure 3 This is the system structure diagram of the air conditioner;

[0027] Figure 4 FIG. 4 is a flow chart of another embodiment of the air conditioner control method of the present invention.

[0028] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0029] 1- compressor; 2- four-way valve; 3- condenser; 4- electronic expansion valve; 5- evaporator; 6- evaporation temperature sensor; 7- condensation temperature sensor; 8- exhaust temperature sensor; 102- acquisition unit; 104- control unit. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] According to an embodiment of the present invention, a method for controlling an air conditioner is provided. The air conditioner includes an evaporator, a condenser, an electronic expansion valve, and a compressor; an exhaust temperature sensor is provided at the compressor for detecting the exhaust temperature of the compressor.

[0032] The specific structure of the air conditioner is as follows Figure 3 As shown, the air conditioner includes a compressor 1, a four-way valve 2, a condenser 3, an electronic expansion valve 4, and an evaporator 5. Two valve ports of the four-way valve 2 are respectively connected to the air inlet and exhaust port of the compressor 1, and the other two valve ports of the four-way valve 2 are respectively connected to the condenser 3 and the evaporator 5. The condenser 3 is connected to the evaporator 5 through the electronic expansion valve 4. The air conditioner is also provided with an evaporating temperature sensor 6, a condensing temperature sensor 7, and an exhaust temperature sensor 8. The evaporating temperature sensor 6 is provided at the refrigerant outlet of the evaporator 5, the condensing temperature sensor 7 is provided at the refrigerant inlet of the condenser 3, and the exhaust temperature sensor 8 is provided at the exhaust port of the compressor 1.

[0033] like Figure 1 FIG. 1 is a flow chart of an embodiment of the method of the present invention. The air conditioner control method may include steps S110 to S150.

[0034] At step S110, during the operation of the air conditioner, the temperature at the refrigerant inlet of the condenser is obtained and recorded as the condensing temperature; the temperature detected by the exhaust temperature sensor is obtained and recorded as the measured exhaust temperature; the opening degree of the electronic expansion valve, the operating frequency of the compressor, and the outdoor ambient temperature are obtained.

[0035] The exhaust temperature sensor may become dislodged or improperly installed. If this happens, the electronic expansion valve opening may continue to deviate from the normal range due to misjudgment by the control system. When the sensor is improperly installed, the sensor's measured value may deviate slightly from the actual value, resulting in reduced system control accuracy. By measuring the condensing temperature, measured exhaust temperature, and electronic expansion valve opening, it is possible to determine whether the exhaust temperature sensor is dislodged or improperly installed. This allows the air conditioner to shut down for protection or adjust the opening, preventing further damage and improving reliability.

[0036] In step S120 , it is determined whether the exhaust temperature sensor is detached based on the opening degree of the electronic expansion valve.

[0037] If the exhaust temperature sensor is disconnected, its output signal will be abnormal, and the measured exhaust temperature will be much lower than the actual exhaust temperature. In this case, the system will continue to reduce the opening at the maximum opening control rate. Therefore, by detecting whether the opening of the electronic expansion valve changes abnormally, it is possible to determine whether the exhaust temperature sensor has disconnected.

[0038] In some embodiments, a process is also included for determining whether the system is operating normally, which specifically includes: before determining whether the exhaust temperature sensor is detached, obtaining the temperature at the refrigerant outlet of the evaporator, recorded as the evaporation temperature; determining the magnitude of the evaporation temperature; if the evaporation temperature is greater than the preset evaporation temperature, determining whether the exhaust temperature sensor is detached based on the opening of the electronic expansion valve; if the evaporation temperature is less than or equal to the preset evaporation temperature, determining whether there is a deviation in the detection result of the exhaust temperature sensor based on the measured exhaust temperature and the condensation temperature.

[0039] The preset evaporating temperature distinguishes the system's normal operating range from the system's abnormal risk range and can be set to 0°C. When the evaporating temperature is greater than 0°C, the refrigerant in the evaporator evaporates above freezing, eliminating the risk of frost. The system is more likely to be operating under normal load, making sensor hardware failures more significant. When the evaporating temperature is ≤ 0°C, frost may form on the evaporator. This layer of frost can affect heat exchange efficiency, lowering the system's exhaust temperature and causing the electronic expansion valve to adjust at its maximum rate. In this case, it's impossible to accurately determine if the sensor has fallen off. Therefore, the sensor failure determination is skipped and only the sensor detection results are evaluated for deviations.

[0040] When the system is in a normal state, it prioritizes detecting sensor detachment, quickly identifying the risk of compressor failure due to high temperature, and preventing equipment damage through shutdown protection. When the system is in an abnormal state, it prioritizes detecting sensor deviation, and through logic correction, it prevents system deterioration caused by deviation and maintains basic operating results.

[0041] In some embodiments, in step S120, the specific process of determining whether the exhaust temperature sensor has fallen off based on the opening of the electronic expansion valve includes: dividing the difference between the preset opening of the electronic expansion valve and the current opening of the electronic expansion valve by the preset opening of the electronic expansion valve, and recording the result as the opening offset rate; determining the size of the opening offset rate; if the opening offset rate is greater than the preset opening offset rate, and the opening offset rate at the current moment is greater than the opening offset rate at the previous moment, determining that the exhaust temperature sensor has fallen off; if the opening offset rate is less than or equal to the preset opening offset rate, determining that the exhaust temperature sensor has not fallen off.

[0042] Preset opening P aIt is the electronic expansion valve opening corresponding to the current compressor frequency, indoor temperature, outdoor temperature and exhaust temperature stored in the system. The system detects and records the electronic expansion valve P of the i-th min. i , opening deviation rate a i =(P a -P i ) / P a When the exhaust temperature sensor falls off, the control system will continue to reduce the opening of the electronic expansion valve due to abnormal measured exhaust temperature, resulting in (P a -P i ) gradually increases, and then a i Gradually increase.

[0043] The preset opening deviation rate is used to distinguish the threshold value of normal fluctuation and abnormal deviation of the opening degree, which can be set to 10%. When the system is operating normally, the opening degree of the electronic expansion valve will be fine-tuned within the range of 10% due to load fluctuations. If it exceeds 10%, it means that the deviation has exceeded the reasonable range and may be caused by sensor shedding. The deviation rate exceeding the threshold at a single moment may be caused by temporary interference. The deviation caused by temporary interference is usually instantaneous and the deviation rate will not continue to increase. Therefore, in order to more accurately judge whether the sensor has fallen off, it is also based on a i Specifically, if a i >10%, a i+1 >a i , it is considered that the sensor has fallen off. At this time, the control system continues to misjudge that the exhaust temperature is too high and will continue to close the electronic expansion valve, resulting in P a -P i Getting bigger and bigger, a i Continue to increase. If a i If the error rate is ≤10%, the sensor is considered to be intact. The introduction of trend analysis significantly improves the robustness of fault identification, effectively eliminating the impact of temporary interference and ensuring that protection is triggered only when the sensor is actually off, reducing false trips.

[0044] In some cases, when the exhaust temperature sensor falls off, it may output an abnormally high temperature value, that is, the measured exhaust temperature is much higher than the actual exhaust temperature and the target exhaust temperature. At this time, the system will continue to increase the opening of the electronic expansion valve. Therefore, when (P a -P i ) gradually decreases, a i <-10% and a i If the value continues to decrease, it is also considered that the sensor has fallen off.

[0045] In step S130 , if it is determined that the exhaust temperature sensor is detached, the air conditioner is controlled to shut down.

[0046] After the sensor falls off, the system cannot obtain accurate temperature and continued operation may cause damage to the compressor, so it shuts down for protection.

[0047] In step S140 , if it is determined that the exhaust temperature sensor is not detached, it is determined whether the detection result of the exhaust temperature sensor deviates from the actual exhaust temperature of the compressor based on the measured exhaust temperature and the condensing temperature.

[0048] In some embodiments, in step S140, the specific process of determining whether there is a deviation in the detection result of the exhaust temperature sensor based on the measured exhaust temperature and the condensing temperature includes: determining the size relationship between the measured exhaust temperature and the condensing temperature; if the measured exhaust temperature is lower than the condensing temperature, determining that there is a deviation in the detection result of the exhaust temperature sensor; if the measured exhaust temperature is greater than or equal to the condensing temperature, determining that there is no deviation in the detection result of the exhaust temperature sensor.

[0049] When the exhaust temperature sensor is not properly installed, the measured exhaust temperature will be lower than the actual exhaust temperature. Under normal circumstances, the exhaust temperature is always higher than the condenser inlet temperature. If the measured result contradicts this, it can be determined that the sensor has detection bias. Therefore, if the measured exhaust temperature is lower than the condensing temperature, the exhaust temperature sensor is considered to have detection bias.

[0050] In step S150 , if it is determined that the detection result of the exhaust temperature sensor has a deviation, the opening of the electronic expansion valve is controlled according to the operating frequency of the compressor and the outdoor ambient temperature.

[0051] The sensor loss detection and deviation detection mechanisms and the dynamic expansion valve control strategy significantly improve the system reliability and adaptability, avoid high-temperature failure and damage of the compressor, and ensure the operation effect of the system.

[0052] In some embodiments, in step S150, controlling the opening of the electronic expansion valve according to the operating frequency of the compressor and the outdoor ambient temperature includes: controlling the lower limit of the opening of the electronic expansion valve to a preset lower limit value; the preset lower limit value is:

[0053] P min =K1*f+K2*T 外 +K3;

[0054] Among them, P min is the preset lower limit value, f is the operating frequency of the compressor, T 外 is the outdoor ambient temperature, K1, K2, and K3 are all coefficients, K1 corresponds to the frequency coefficient, K2 corresponds to the outer loop coefficient, and K3 corresponds to the opening correction value. The coefficient values ​​are different in cooling mode and wet heat mode.

[0055] When there is a detection deviation in the exhaust temperature sensor, the measured exhaust temperature is lower than the actual exhaust temperature, and the system will continue to close the electronic expansion valve, trying to increase the exhaust temperature by reducing the refrigerant flow. This misadjustment will lead to insufficient refrigerant flow, reducing the system's operating performance; insufficient refrigerant flow will also cause the compressor's heat dissipation to fail, which may trigger high-temperature protection or even burn out the compressor. Therefore, the lower limit of the electronic expansion valve is controlled to a preset lower limit value determined according to the compressor frequency and outdoor temperature to ensure that the refrigerant flow is not lower than the minimum heat exchange requirement. Even if there is a deviation in the sensor, it can avoid a sharp drop in cooling or heating capacity due to a sudden drop in flow. For example, when the system is running at high frequency, f increases, the heat generated by the compressor increases, and P min will increase accordingly to ensure that more refrigerant takes away heat; when the outdoor temperature is high, T 外 increases, the condensation heat dissipation efficiency decreases, P min Increase to increase flow and avoid excessive rise in exhaust temperature.

[0056] In some embodiments, the process of correcting the exhaust temperature to avoid a low measured exhaust temperature is also included. The process specifically includes: if it is determined that there is a deviation in the detection result of the exhaust temperature sensor, the measured exhaust temperature is corrected, and the air-conditioning operation is controlled with the corrected measured exhaust temperature; wherein the sum of the measured exhaust temperature and the preset correction temperature is used as the corrected measured exhaust temperature.

[0057] When the exhaust temperature sensor's measured exhaust temperature is too low, the exhaust temperature can be corrected to ensure safe system operation while avoiding frequent downtime that could impact the user experience. Based on the refrigerant circulation direction of the air conditioning system, the exhaust temperature should be 1 to 10°C higher than the condenser inlet temperature. This means the preset correction temperature range is 1 to 10°C, specifically 3°C. The corrected measured exhaust temperature is added 3°C to the measured exhaust temperature, thereby raising the low measured temperature to a reasonable range and bringing the corrected temperature closer to the actual exhaust temperature. Controlling the air conditioning operation based on the corrected exhaust temperature restores normal control logic. By correcting the measured exhaust temperature, air conditioning system crashes due to sensor problems are avoided, improving system reliability. Furthermore, there's no need to immediately replace the sensor; repairs can be arranged at the user's convenience, reducing emergency visits and lowering maintenance costs.

[0058] Figure 4 FIG. 1 is a flow chart of another embodiment of the air conditioner control method of the present invention. Figure 4 As shown, the method includes:

[0059] Step 1: After the air conditioner starts running, continuously detect and record the electronic expansion valve opening P and evaporation temperature T 蒸 , condenser inlet temperature T 冷进 , determine whether T蒸 > 0. If T 蒸 >0, then go to step 2; if T 蒸 ≤0, proceed to step 3.

[0060] Step 2: Detect and record the opening of the electronic expansion valve at the i-th minute as P i (i=1, 2, ..., 10), calculate the electronic expansion valve offset rate α i =(P a -P i ) / P a , where P a is the opening of the electronic expansion valve corresponding to the current frequency, indoor ambient temperature, outdoor ambient temperature, and exhaust temperature. i >10% and α i+1 >α i , if α i >10% and α i+1 >α i , then the air conditioning system is judged to be abnormal and the system will be shut down; if α i ≤10%, go to step 3.

[0061] Step 3: Detect and record T 冷进 , exhaust temperature T 排 , determine whether T 排 <T 冷进 , if T 排 <T 冷进 , then let the electronic expansion valve opening P≥P min , P min =K1*f+K2*T 外 +K3; if T 排 ≥T 冷进 , the opening of the electronic expansion valve is not adjusted.

[0062] By determining whether the exhaust temperature sensor has failed based on the air conditioner's electronic expansion valve opening, the system effectively and timely protects system reliability. If the sensor has not failed, the system further determines whether the air conditioner's exhaust temperature sensor has detection deviation. If deviation is detected, the system activates the electronic expansion valve opening lower limit control to ensure air conditioning system reliability.

[0063] Using the technical solution of this embodiment, when the air conditioner is operating, the air conditioner determines whether the exhaust temperature sensor has fallen off based on the electronic expansion valve opening. If the exhaust temperature sensor is determined to be fallen off, the air conditioner is shut down. If the exhaust temperature sensor is determined to be intact, the exhaust temperature sensor's detection result is determined to be deviated based on the measured exhaust temperature and the temperature at the refrigerant inlet of the condenser. If the exhaust temperature sensor's detection result is deviated, the electronic expansion valve opening is controlled based on the compressor frequency and the outdoor temperature. Thus, by detecting whether the exhaust temperature sensor has fallen off and the detection result is deviated, the air conditioner is shut down if the sensor is fallen off to avoid damage. If the detection result deviates, the electronic expansion valve opening is adjusted to prevent compressor failure and damage due to high temperature, thereby improving system operation and reliability.

[0064] According to an embodiment of the present invention, a control device for an air conditioner corresponding to the control method for an air conditioner is also provided. The air conditioner includes an evaporator, a condenser, an electronic expansion valve, and a compressor; the compressor is provided with an exhaust temperature sensor for detecting the exhaust temperature of the compressor.

[0065] The specific structure of the air conditioner is as follows Figure 3 As shown, the air conditioner includes a compressor 1, a four-way valve 2, a condenser 3, an electronic expansion valve 4, and an evaporator 5. Two valve ports of the four-way valve 2 are respectively connected to the air inlet and exhaust port of the compressor 1, and the other two valve ports of the four-way valve 2 are respectively connected to the condenser 3 and the evaporator 5. The condenser 3 is connected to the evaporator 5 through the electronic expansion valve 4. The air conditioner is also provided with an evaporating temperature sensor 6, a condensing temperature sensor 7, and an exhaust temperature sensor 8. The evaporating temperature sensor 6 is provided at the refrigerant outlet of the evaporator 5, the condensing temperature sensor 7 is provided at the refrigerant inlet of the condenser 3, and the exhaust temperature sensor 8 is provided at the exhaust port of the compressor 1.

[0066] See also Figure 2 FIG2 is a schematic structural diagram of an embodiment of the device of the present invention. The air conditioner control device may include: an acquisition unit 102 and a control unit 104.

[0067] Acquisition unit 102 is configured to, during operation of the air conditioner, acquire the temperature at the refrigerant inlet of the condenser, recorded as the condensing temperature; acquire the temperature detected by the exhaust temperature sensor, recorded as the measured exhaust temperature; and acquire the opening of the electronic expansion valve, the operating frequency of the compressor, and the outdoor ambient temperature. The specific functions and processing of acquisition unit 102 are described in step S110.

[0068] The exhaust temperature sensor may become dislodged or improperly installed. If this happens, the electronic expansion valve opening may continue to deviate from the normal range due to misjudgment by the control system. When the sensor is improperly installed, the sensor's measured value may deviate slightly from the actual value, resulting in reduced system control accuracy. By measuring the condensing temperature, measured exhaust temperature, and electronic expansion valve opening, it is possible to determine whether the exhaust temperature sensor is dislodged or improperly installed. This allows the air conditioner to shut down for protection or adjust the opening, preventing further damage and improving reliability.

[0069] The control unit 104 is configured to determine whether the exhaust gas temperature sensor is detached according to the opening of the electronic expansion valve. The specific functions and processing of the control unit 104 are shown in step S120.

[0070] If the exhaust temperature sensor is disconnected, its output signal will be abnormal, and the measured exhaust temperature will be much lower than the actual exhaust temperature. In this case, the system will continue to reduce the opening at the maximum opening control rate. Therefore, by detecting whether the opening of the electronic expansion valve changes abnormally, it is possible to determine whether the exhaust temperature sensor has disconnected.

[0071] In some embodiments, the control unit 104 is further configured to: before determining whether the exhaust temperature sensor has fallen off, obtain the temperature at the refrigerant outlet of the evaporator, recorded as the evaporation temperature; determine the magnitude of the evaporation temperature; if the evaporation temperature is greater than the preset evaporation temperature, determine whether the exhaust temperature sensor has fallen off based on the opening of the electronic expansion valve; if the evaporation temperature is less than or equal to the preset evaporation temperature, determine whether there is a deviation in the detection result of the exhaust temperature sensor based on the measured exhaust temperature and the condensation temperature.

[0072] The preset evaporating temperature distinguishes the system's normal operating range from the system's abnormal risk range and can be set to 0°C. When the evaporating temperature is greater than 0°C, the refrigerant in the evaporator evaporates above freezing, eliminating the risk of frost. The system is more likely to be operating under normal load, making sensor hardware failures more significant. When the evaporating temperature is ≤ 0°C, frost may form on the evaporator. This layer of frost can affect heat exchange efficiency, lowering the system's exhaust temperature and causing the electronic expansion valve to adjust at its maximum rate. In this case, it's impossible to accurately determine if the sensor has fallen off. Therefore, the sensor failure determination is skipped and only the sensor detection results are evaluated for deviations.

[0073] When the system is in a normal state, it prioritizes detecting sensor detachment, quickly identifying the risk of compressor failure due to high temperature, and preventing equipment damage through shutdown protection. When the system is in an abnormal state, it prioritizes detecting sensor deviation, and through logic correction, it prevents system deterioration caused by deviation and maintains basic operating results.

[0074] In some embodiments, the control unit 104 determines whether the exhaust temperature sensor has fallen off based on the opening of the electronic expansion valve, including: dividing the difference between the preset opening of the electronic expansion valve and the current opening of the electronic expansion valve by the preset opening of the electronic expansion valve, and recording the result as the opening offset rate; determining the size of the opening offset rate; if the opening offset rate is greater than the preset opening offset rate, and the opening offset rate at the current moment is greater than the opening offset rate at the previous moment, determining that the exhaust temperature sensor has fallen off; if the opening offset rate is less than or equal to the preset opening offset rate, determining that the exhaust temperature sensor has not fallen off.

[0075] Preset opening P a It is the electronic expansion valve opening corresponding to the current compressor frequency, indoor temperature, outdoor temperature and exhaust temperature stored in the system. The system detects and records the electronic expansion valve P of the i-th min. i , opening deviation rate a i =(P a -P i ) / P a When the exhaust temperature sensor falls off, the control system will continue to reduce the opening of the electronic expansion valve due to abnormal measured exhaust temperature, resulting in (P a -P i ) gradually increases, and then a i Gradually increase.

[0076] The preset opening deviation rate is used to distinguish the threshold value of normal fluctuation and abnormal deviation of the opening degree, which can be set to 10%. When the system is operating normally, the opening degree of the electronic expansion valve will be fine-tuned within the range of 10% due to load fluctuations. If it exceeds 10%, it means that the deviation has exceeded the reasonable range and may be caused by sensor shedding. The deviation rate exceeding the threshold at a single moment may be caused by temporary interference. The deviation caused by temporary interference is usually instantaneous and the deviation rate will not continue to increase. Therefore, in order to more accurately judge whether the sensor has fallen off, it is also based on a i Specifically, if a i >10%, a i+1 >a i , it is considered that the sensor has fallen off. At this time, the control system continues to misjudge that the exhaust temperature is too high and will continue to close the electronic expansion valve, resulting in P a -P i Getting bigger and bigger, a i Continue to increase. If a i If the error rate is ≤10%, the sensor is considered to be intact. The introduction of trend analysis significantly improves the robustness of fault identification, effectively eliminating the impact of temporary interference and ensuring that protection is triggered only when the sensor is actually off, reducing false trips.

[0077] In some cases, when the exhaust temperature sensor falls off, it may output an abnormally high temperature value, that is, the measured exhaust temperature is much higher than the actual exhaust temperature and the target exhaust temperature. At this time, the system will continue to increase the opening of the electronic expansion valve. Therefore, when (P a -P i ) gradually decreases, a i <-10% and a i If the value continues to decrease, it is also considered that the sensor has fallen off.

[0078] The control unit 104 is further configured to control the air conditioner to shut down if it is determined that the exhaust temperature sensor is detached. The specific functions and processing of the control unit 104 are shown in step S130.

[0079] After the sensor falls off, the system cannot obtain accurate temperature and continued operation may cause damage to the compressor, so it shuts down for protection.

[0080] The control unit 104 is further configured to, if it is determined that the exhaust temperature sensor is not detached, determine whether the detection result of the exhaust temperature sensor deviates from the actual exhaust temperature of the compressor based on the measured exhaust temperature and the condensing temperature. The specific functions and processing of the control unit 104 are described in step S140.

[0081] In some embodiments, the control unit 104 determines whether there is a deviation in the detection result of the exhaust temperature sensor based on the measured exhaust temperature and the condensing temperature, including: determining the size relationship between the measured exhaust temperature and the condensing temperature; if the measured exhaust temperature is lower than the condensing temperature, determining that there is a deviation in the detection result of the exhaust temperature sensor; if the measured exhaust temperature is greater than or equal to the condensing temperature, determining that there is no deviation in the detection result of the exhaust temperature sensor.

[0082] When the exhaust temperature sensor is not properly installed, the measured exhaust temperature will be lower than the actual exhaust temperature. Under normal circumstances, the exhaust temperature is always higher than the condenser inlet temperature. If the measured result contradicts this, it can be determined that the sensor has detection bias. Therefore, if the measured exhaust temperature is lower than the condensing temperature, the exhaust temperature sensor is considered to have detection bias.

[0083] The control unit 104 is further configured to control the opening of the electronic expansion valve according to the operating frequency of the compressor and the outdoor ambient temperature if it is determined that the detection result of the exhaust temperature sensor is deviated. The specific functions and processing of the control unit 104 are shown in step S150.

[0084] The sensor loss detection and deviation detection mechanisms and the dynamic expansion valve control strategy significantly improve the system reliability and adaptability, avoid high-temperature failure and damage of the compressor, and ensure the operation effect of the system.

[0085] In some embodiments, the control unit 104 controls the opening of the electronic expansion valve according to the operating frequency of the compressor and the outdoor ambient temperature, including: controlling the lower limit of the opening of the electronic expansion valve to a preset lower limit value; the preset lower limit value is:

[0086] P min =K1*f+K2*T 外 +K3;

[0087] Among them, P min is the preset lower limit value, f is the operating frequency of the compressor, T 外 is the outdoor ambient temperature, K1, K2, and K3 are all coefficients, K1 corresponds to the frequency coefficient, K2 corresponds to the outer loop coefficient, and K3 corresponds to the opening correction value. The coefficient values ​​are different in cooling mode and wet heat mode.

[0088] When there is a detection deviation in the exhaust temperature sensor, the measured exhaust temperature is lower than the actual exhaust temperature, and the system will continue to close the electronic expansion valve, trying to increase the exhaust temperature by reducing the refrigerant flow. This misadjustment will lead to insufficient refrigerant flow, reducing the system's operating performance; insufficient refrigerant flow will also cause the compressor's heat dissipation to fail, which may trigger high-temperature protection or even burn out the compressor. Therefore, the lower limit of the electronic expansion valve is controlled to a preset lower limit value determined according to the compressor frequency and outdoor temperature to ensure that the refrigerant flow is not lower than the minimum heat exchange requirement. Even if there is a deviation in the sensor, it can avoid a sharp drop in cooling or heating capacity due to a sudden drop in flow. For example, when the system is running at high frequency, f increases, the heat generated by the compressor increases, and P min will increase accordingly to ensure that more refrigerant takes away heat; when the outdoor temperature is high, T 外 increases, the condensation heat dissipation efficiency decreases, P min Increase to increase flow and avoid excessive rise in exhaust temperature.

[0089] In some embodiments, the control unit 104 is further configured to: if it is determined that there is a deviation in the detection result of the exhaust temperature sensor, correct the measured exhaust temperature, and control the operation of the air conditioner with the corrected measured exhaust temperature; wherein the sum of the measured exhaust temperature and the preset correction temperature is used as the corrected measured exhaust temperature.

[0090] When the exhaust temperature sensor's measured exhaust temperature is too low, the exhaust temperature can be corrected to ensure safe system operation while avoiding frequent downtime that could impact the user experience. Based on the refrigerant circulation direction of the air conditioning system, the exhaust temperature should be 1 to 10°C higher than the condenser inlet temperature. This means the preset correction temperature range is 1 to 10°C, specifically 3°C. The corrected measured exhaust temperature is added 3°C to the measured exhaust temperature, thereby raising the low measured temperature to a reasonable range and bringing the corrected temperature closer to the actual exhaust temperature. Controlling the air conditioning operation based on the corrected exhaust temperature restores normal control logic. By correcting the measured exhaust temperature, air conditioning system crashes due to sensor problems are avoided, improving system reliability. Furthermore, there's no need to immediately replace the sensor; repairs can be arranged at the user's convenience, reducing emergency visits and lowering maintenance costs.

[0091] Figure 4 FIG. 1 is a flow chart of another embodiment of the air conditioner control method of the present invention. Figure 4 As shown, the method includes:

[0092] Step 1: After the air conditioner starts running, continuously detect and record the electronic expansion valve opening P and evaporation temperature T 蒸 , condenser inlet temperature T 冷进 , determine whether T 蒸 > 0. If T 蒸 >0, then go to step 2; if T 蒸 ≤0, proceed to step 3.

[0093] Step 2: Detect and record the opening of the electronic expansion valve at the i-th minute as P i (i=1, 2, ..., 10), calculate the electronic expansion valve offset rate α i =(P a -P i ) / P a , where P a is the opening of the electronic expansion valve corresponding to the current frequency, indoor ambient temperature, outdoor ambient temperature, and exhaust temperature. i >10% and α i+1 >α i , if α i >10% and α i+1 >α i , then the air conditioning system is judged to be abnormal and the system will be shut down; if α i ≤10%, go to step 3.

[0094] Step 3: Detect and record T 冷进 , exhaust temperature T 排 , determine whether T 排 <T 冷进 , if T 排<T 冷进 , then let the electronic expansion valve opening P≥P min , P min =K1*f+K2*T 外 +K3; if T 排 ≥T 冷进 , the opening of the electronic expansion valve is not adjusted.

[0095] By determining whether the exhaust temperature sensor has failed based on the air conditioner's electronic expansion valve opening, the system effectively and timely protects system reliability. If the sensor has not failed, the system further determines whether the air conditioner's exhaust temperature sensor has detection deviation. If deviation is detected, the system activates the electronic expansion valve opening lower limit control to ensure air conditioning system reliability.

[0096] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0097] The technical solution of the present invention determines whether the exhaust temperature sensor has fallen off based on the electronic expansion valve opening during air conditioning operation. If the exhaust temperature sensor is determined to be fallen off, the air conditioner is shut down. If the exhaust temperature sensor is determined to be intact, the exhaust temperature sensor's detection result is determined to be deviated based on the measured exhaust temperature and the temperature at the refrigerant inlet of the condenser. If the detection result of the exhaust temperature sensor is determined to be deviated, the electronic expansion valve opening is controlled based on the compressor frequency and the outdoor temperature. Thus, by detecting whether the exhaust temperature sensor has fallen off and the detection result is deviated, the air conditioner is shut down if the sensor has fallen off to avoid damage to the air conditioner. If the detection result deviates, the electronic expansion valve opening is adjusted to avoid compressor failure and damage due to high temperature, thereby improving system operation and reliability.

[0098] According to an embodiment of the present invention, an air conditioner corresponding to the air conditioner control device is also provided. The air conditioner may include: the air conditioner control device described above.

[0099] Since the processing and functions implemented by the air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0100] The technical solution of the present invention determines whether the exhaust temperature sensor has fallen off based on the electronic expansion valve opening during air conditioning operation. If the exhaust temperature sensor is determined to be fallen off, the air conditioner is shut down. If the exhaust temperature sensor is determined to be intact, the exhaust temperature sensor's detection result is determined to be deviated based on the measured exhaust temperature and the temperature at the refrigerant inlet of the condenser. If the detection result of the exhaust temperature sensor is determined to be deviated, the electronic expansion valve opening is controlled based on the compressor frequency and the outdoor temperature. Thus, by detecting whether the exhaust temperature sensor has fallen off and the detection result is deviated, the air conditioner is shut down if the sensor has fallen off to avoid damage to the air conditioner. If the detection result deviates, the electronic expansion valve opening is adjusted to avoid compressor failure and damage due to high temperature, thereby improving system operation and reliability.

[0101] According to an embodiment of the present invention, a storage medium corresponding to the air conditioner control method is also provided, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned air conditioner control method.

[0102] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0103] The technical solution of the present invention determines whether the exhaust temperature sensor has fallen off based on the electronic expansion valve opening during air conditioning operation. If the exhaust temperature sensor is determined to be fallen off, the air conditioner is shut down. If the exhaust temperature sensor is determined to be intact, the exhaust temperature sensor's detection result is determined to be deviated based on the measured exhaust temperature and the temperature at the refrigerant inlet of the condenser. If the detection result of the exhaust temperature sensor is determined to be deviated, the electronic expansion valve opening is controlled based on the compressor frequency and the outdoor temperature. Thus, by detecting whether the exhaust temperature sensor has fallen off and the detection result is deviated, the air conditioner is shut down if the sensor has fallen off to avoid damage to the air conditioner. If the detection result deviates, the electronic expansion valve opening is adjusted to avoid compressor failure and damage due to high temperature, thereby improving system operation and reliability.

[0104] According to an embodiment of the present invention, a computer program product corresponding to the air conditioner control method is also provided. The computer program product includes a computer program. When the computer program product is processed and executed, the steps of the air conditioner control method are implemented.

[0105] Since the processing and functions implemented by the computer program product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0106] The technical solution of the present invention determines whether the exhaust temperature sensor has fallen off based on the electronic expansion valve opening during air conditioning operation. If the exhaust temperature sensor is determined to be fallen off, the air conditioner is shut down. If the exhaust temperature sensor is determined to be intact, the exhaust temperature sensor's detection result is determined to be deviated based on the measured exhaust temperature and the temperature at the refrigerant inlet of the condenser. If the detection result of the exhaust temperature sensor is determined to be deviated, the electronic expansion valve opening is controlled based on the compressor frequency and the outdoor temperature. Thus, by detecting whether the exhaust temperature sensor has fallen off and the detection result is deviated, the air conditioner is shut down if the sensor has fallen off to avoid damage to the air conditioner. If the detection result deviates, the electronic expansion valve opening is adjusted to avoid compressor failure and damage due to high temperature, thereby improving system operation and reliability.

[0107] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0108] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims.

Claims

1. A method for controlling an air conditioner, characterized in that: The air conditioner includes an evaporator, a condenser, an electronic expansion valve, and a compressor; the compressor is provided with an exhaust temperature sensor for detecting the exhaust temperature of the compressor; The method comprises: During the operation of the air conditioner, the temperature at the refrigerant inlet of the condenser is obtained, which is recorded as the condensing temperature; the temperature detected by the exhaust temperature sensor is obtained, which is recorded as the measured exhaust temperature; the opening of the electronic expansion valve, the operating frequency of the compressor, and the outdoor ambient temperature are obtained; determining whether the exhaust temperature sensor is detached according to the opening degree of the electronic expansion valve; If it is determined that the exhaust temperature sensor is detached, the air conditioner is controlled to shut down; If it is determined that the exhaust temperature sensor is not detached, determining whether there is a deviation in the detection result of the exhaust temperature sensor according to the measured exhaust temperature and the condensation temperature; If it is determined that the detection result of the exhaust temperature sensor has a deviation, the opening degree of the electronic expansion valve is controlled according to the operating frequency of the compressor and the outdoor ambient temperature.

2. The air conditioner control method according to claim 1, characterized in that: Also includes: Before determining whether the exhaust temperature sensor is detached, obtaining the temperature at the refrigerant outlet of the evaporator and recording it as the evaporation temperature; Determining the magnitude of the evaporation temperature; If the evaporation temperature is greater than the preset evaporation temperature, determining whether the exhaust temperature sensor is detached according to the opening of the electronic expansion valve; If the evaporation temperature is less than or equal to the preset evaporation temperature, it is determined whether there is a deviation in the detection result of the exhaust temperature sensor according to the measured exhaust temperature and the condensation temperature.

3. The air conditioner control method according to claim 1 or 2, characterized in that: Determining whether the exhaust temperature sensor is detached according to the opening of the electronic expansion valve includes: The difference between the preset opening of the electronic expansion valve and the current opening of the electronic expansion valve is divided by the preset opening of the electronic expansion valve, and the result is recorded as the opening offset rate; Determining the magnitude of the opening deviation rate; If the opening deviation rate is greater than the preset opening deviation rate, and the opening deviation rate at the current moment is greater than the opening deviation rate at the previous moment, it is determined that the exhaust temperature sensor is detached; If the opening deviation rate is less than or equal to the preset opening deviation rate, it is determined that the exhaust temperature sensor is not detached.

4. The air conditioner control method according to claim 1 or 2, characterized in that: Determining whether there is a deviation in a detection result of the exhaust temperature sensor according to the measured exhaust temperature and the condensing temperature includes: Determining the magnitude relationship between the measured exhaust temperature and the condensation temperature; If the measured exhaust temperature is lower than the condensing temperature, it is determined that a detection result of the exhaust temperature sensor has a deviation; If the measured exhaust temperature is greater than or equal to the condensing temperature, it is determined that there is no deviation in the detection result of the exhaust temperature sensor.

5. The air conditioner control method according to claim 1 or 4, characterized in that: Controlling the opening of the electronic expansion valve according to the operating frequency of the compressor and the outdoor ambient temperature includes: The lower limit of the opening of the electronic expansion valve is controlled to be a preset lower limit value; the preset lower limit value is: P min =K1*f+K2*T 外 +K3; Among them, P min is the preset lower limit value, f is the operating frequency of the compressor, T 外 is the outdoor ambient temperature, K1, K2, and K3 are coefficients.

6. The air conditioner control method according to claim 1 or 4, characterized in that: Also includes: If it is determined that the detection result of the exhaust temperature sensor has a deviation, the measured exhaust temperature is corrected, and the air conditioner is controlled to operate with the corrected measured exhaust temperature; The sum of the actually measured exhaust temperature and the preset correction temperature is used as the corrected actually measured exhaust temperature.

7. A control device for an air conditioner, characterized in that: The air conditioner includes an evaporator, a condenser, an electronic expansion valve, and a compressor; the compressor is provided with an exhaust temperature sensor for detecting the exhaust temperature of the compressor; The device comprises: an acquisition unit configured to acquire, during operation of the air conditioner, a temperature at a refrigerant inlet of the condenser, recorded as a condensing temperature; acquire a temperature detected by the exhaust temperature sensor, recorded as a measured exhaust temperature; acquire an opening of the electronic expansion valve, an operating frequency of the compressor, and an outdoor ambient temperature; a control unit configured to determine whether the exhaust temperature sensor is detached according to the opening degree of the electronic expansion valve; The control unit is further configured to control the air conditioner to shut down if it is determined that the exhaust temperature sensor is detached; The control unit is further configured to, if it is determined that the exhaust temperature sensor is not detached, determine whether there is a deviation in the detection result of the exhaust temperature sensor based on the measured exhaust temperature and the condensation temperature; The control unit is further configured to control the opening of the electronic expansion valve according to the operating frequency of the compressor and the outdoor ambient temperature if it is determined that the detection result of the exhaust temperature sensor has a deviation.

8. An air conditioner, characterized in that: include: The air conditioner control device according to claim 7.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the air conditioner control method according to any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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