Variable frequency air conditioner control method, device and system and variable frequency air conditioner

Abstract

The invention discloses a variable frequency air conditioner control method, device and system and a variable frequency air conditioner. Belongs to the variable-frequency air conditioner control field. The method comprises the steps that the exhaust temperature detected by an exhaust temperature sensor is obtained, and when the exhaust temperature meets a preset condition, an exhaust temperature sensor failure detection program is triggered; after the exhaust temperature sensor failure detection program is triggered, the target parameter is changed, and whether the exhaust temperature sensor fails or not is determined according to the exhaust temperature before and after the target parameter is changed. According to the scheme, the failure of the exhaust temperature sensor can be detected in time, the conditions of system pressure rise, refrigerant flow reduction, compressor idling and the like are avoided, and stable operation of the air conditioning system is ensured. By detecting and processing the failure problem of the sensor in time, abnormal operation and potential safety hazards of the system are effectively prevented, and the overall reliability of the air conditioning system is improved.

Description

Technical Field

[0001] This application relates to the technical field of variable-frequency air conditioner control, and in particular, to a variable-frequency air conditioner control method, device, system, and variable-frequency air conditioner. Background Art

[0002] The operating state of a variable-frequency air conditioner system is affected by various factors such as ambient temperature, heat load, and compressor operating frequency. Currently, variable-frequency air conditioners mainly use the opening control of an electronic expansion valve. According to the compressor gas output and real-time load demand, the opening of the electronic expansion valve is adjusted to output an appropriate refrigerant flow rate to make the operation of the variable-frequency air conditioner match the changing heat load.

[0003] The opening control of the electronic expansion valve adopts the form of target exhaust temperature regulation. As a relatively sensitive parameter of the refrigerant system, the exhaust temperature can comprehensively reflect the influence of control parameter changes and ambient load fluctuations on the refrigerant system. The opening control of the electronic expansion valve mainly sets a target exhaust temperature range according to different compressor frequencies and indoor and outdoor ambient temperatures. By detecting the real-time exhaust temperature and calculating the difference between the measured temperature and the current target exhaust temperature, the opening of the electronic expansion valve is increased or decreased to make the actual exhaust temperature close to the target exhaust temperature.

[0004] However, the existing control method has limitations: if the exhaust temperature sensor fails, the system will not be able to perceive the operating state of the refrigerant system through the exhaust temperature, resulting in the continuous reduction of the opening of the electronic expansion valve (the valve opening is usually adjusted to the maximum at the initial stage of startup), and ultimately causing situations such as increased system pressure, reduced refrigerant flow rate, and compressor idling. Summary of the Invention

[0005] To overcome the deficiencies of the prior art, this application provides a variable-frequency air conditioner control method, device, system, and variable-frequency air conditioner to solve the problem that when the exhaust temperature sensor fails, users cannot be informed in time, resulting in the continuous reduction of the opening of the electronic expansion valve, and ultimately causing situations such as increased system pressure, reduced refrigerant flow rate, and compressor idling.

[0006] The technical solution adopted by this application to solve its technical problems is as follows:

[0007] In a first aspect, a variable-frequency air conditioner control method is provided, including:

[0008] After triggering the exhaust temperature sensor failure detection program, control the target parameter to change, where the target parameter includes the indoor fan speed or the outdoor fan speed;

[0009] Determine whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature, where the first exhaust gas temperature is the exhaust gas temperature when the control target parameter changes, and the second exhaust gas temperature is the exhaust gas temperature at the first preset duration after the control target parameter changes.

[0010] As an optional implementation manner of the present application, determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature includes:

[0011] Obtain the operating mode of the variable frequency air conditioner and the changing manner of the target parameter, where the operating mode includes a cooling mode and a heating mode, and the changing manner includes increasing the wind speed and decreasing the wind speed;

[0012] Determine a theoretical exhaust gas temperature difference based on the operating mode, the target parameter, and the changing manner, where the theoretical exhaust gas temperature difference includes positive and negative values and magnitude;

[0013] When the exhaust gas temperature difference is different from the theoretical exhaust gas temperature difference, determine that the exhaust gas temperature sensor fails; when the exhaust gas temperature difference is the same as the theoretical exhaust gas temperature difference, determine that the exhaust gas temperature sensor is normal.

[0014] As an optional implementation manner of the present application, when the target parameter is the outdoor fan speed, determining the theoretical exhaust gas temperature difference based on the operating mode, the target parameter, and the changing manner includes:

[0015] When the operating mode is the cooling mode, if the changing manner is to increase the wind speed, determine that the theoretical exhaust gas temperature difference is greater than 0; if the changing manner is to decrease the wind speed, determine that the theoretical exhaust gas temperature difference is less than 0;

[0016] When the operating mode is the heating mode, if the changing manner is to increase the wind speed, determine that the theoretical exhaust gas temperature difference is greater than 0; if the changing manner is to decrease the wind speed, determine that the theoretical exhaust gas temperature difference is less than 0.

[0017] As an optional implementation manner of the present application, when the target parameter is the indoor fan speed, determining the theoretical exhaust gas temperature difference based on the operating mode, the target parameter, and the changing manner includes:

[0018] When the operating mode is the cooling mode, if the changing manner is to increase the wind speed, determine that the theoretical exhaust gas temperature difference is less than 0; if the changing manner is to decrease the wind speed, determine that the theoretical exhaust gas temperature difference is greater than 0;

[0019] When the operating mode is the heating mode, if the change method is to increase the wind speed, it is determined that the theoretical exhaust gas temperature difference is less than 0; if the change method is to decrease the wind speed, it is determined that the theoretical exhaust gas temperature difference is greater than 0.

[0020] As an optional implementation manner of the present application, determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature includes:

[0021] Calculating the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature;

[0022] When the absolute value of the exhaust gas temperature difference is less than the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor fails; when the absolute value of the exhaust gas temperature difference is greater than or equal to the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor is normal.

[0023] As an optional implementation manner of the present application, the control target parameter is changed to change once every preset period, and determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature includes:

[0024] Calculating the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature within the same period;

[0025] When the absolute value of the exhaust gas temperature difference within each period is less than the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor fails; when the absolute value of the exhaust gas temperature difference within any period is greater than or equal to the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor is normal.

[0026] As an optional implementation manner of the present application, it further includes:

[0027] Obtaining the exhaust gas temperature within the target time period;

[0028] When the exhaust gas temperature within the target time period meets the preset conditions, triggering the exhaust gas temperature sensor failure detection program.

[0029] As an optional implementation manner of the present application, it further includes:

[0030] Calculating the exhaust gas temperature change value within the target time period, where the exhaust gas temperature change value is the absolute value of the difference between the exhaust gas temperature at the current moment and the exhaust gas temperature at the previous moment;

[0031] When the exhaust gas temperature change value is less than the preset exhaust gas temperature change value, it is determined that the exhaust gas temperature meets the preset conditions; when the exhaust gas temperature change value is greater than or equal to the preset exhaust gas temperature change value, it is determined that the exhaust gas temperature does not meet the preset conditions.

[0032] As an alternative implementation of the present application, it further includes:

[0033] Calculating the difference between the exhaust gas temperature and the heat exchanger tube temperature within the target period;

[0034] When the difference between the exhaust gas temperature and the heat exchanger tube temperature is less than the preset difference, it is determined that the exhaust gas temperature meets the preset conditions; when the difference between the exhaust gas temperature and the heat exchanger tube temperature is greater than or equal to the preset difference, it is determined that the exhaust gas temperature does not meet the preset conditions.

[0035] In a second aspect, a variable frequency air conditioner control device is provided, including:

[0036] An exhaust gas temperature acquisition module for acquiring the exhaust gas temperature detected by an exhaust gas temperature sensor;

[0037] A failure detection trigger module for triggering an exhaust gas temperature sensor failure detection program when the exhaust gas temperature meets the preset conditions;

[0038] A failure warning sending module for sending a warning if the exhaust gas temperature sensor fails.

[0039] In a third aspect, a variable frequency air conditioner control system is provided, including:

[0040] At least one processor and at least one memory;

[0041] The memory stores executable instructions of the processor;

[0042] The processor is configured to execute the variable frequency air conditioner control method according to any one of the above technical solutions.

[0043] In a fourth aspect, a variable frequency air conditioner is provided, which applies the variable frequency air conditioner control method according to any one of the above technical solutions.

[0044] Advantageous effects:

[0045] The technical solution of the present application provides a variable frequency air conditioner control method, device, system and variable frequency air conditioner. The method includes: acquiring the exhaust gas temperature detected by an exhaust gas temperature sensor, triggering an exhaust gas temperature sensor failure detection program when the exhaust gas temperature meets the preset conditions; after triggering the exhaust gas temperature sensor failure detection program, changing the target parameter, and determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature before and after the change of the target parameter. The solution of the present application can detect the failure of the exhaust gas temperature sensor in time, avoid situations such as increased system pressure, reduced refrigerant flow and compressor idling, and ensure the stable operation of the air conditioner system. By detecting and handling the sensor failure problem in time, it effectively prevents the occurrence of abnormal system operation and potential safety hazards, and improves the overall reliability of the air conditioner system. Description of the drawings

[0046] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0047] Figure 1 is a flowchart of a variable-frequency air conditioner control method provided by an embodiment of the present application;

[0048] Figure 2 is a flowchart of a specific variable-frequency air conditioner control method provided by an embodiment of the present application

[0049] Figure 3 is another flowchart of a specific variable-frequency air conditioner control method provided by an embodiment of the present application;

[0050] Figure 4 is a schematic structural diagram of a variable-frequency air conditioner control device provided by an embodiment of the present application;

[0051] Figure 5 is a schematic structural diagram of a variable-frequency air conditioner control system provided by an embodiment of the present application. Detailed implementation manners

[0052] To make the objectives, technical solutions, and advantages of the present application clearer, the following will describe the technical solutions of the present application in detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present application.

[0053] The traditional exhaust temperature sensor detection method is to determine whether the exhaust temperature sensor fails by judging whether the exhaust temperature changes before and after startup. If the exhaust temperature changes before and after startup, it is determined that the exhaust temperature sensor has not failed. If the exhaust temperature does not change before and after startup, it is determined that the exhaust temperature sensor fails. However, this solution can only detect whether the exhaust sensor fails during the startup stage. If the air conditioner runs after startup, it cannot be judged.

[0054] To solve this problem, referring to Figure 1 , an embodiment of the present application provides a variable-frequency air conditioner control method, including:

[0055] S11: After triggering the exhaust gas temperature sensor failure detection program, control the target parameter to change, where the target parameter includes the indoor fan speed or the outdoor fan speed; the exhaust gas temperature sensor failure detection program can be triggered directly after the variable-frequency air conditioner is turned on, or can be triggered based on certain events, such as the exhaust gas temperature remaining unchanged before and after startup, or the difference between the exhaust gas temperature and the heat exchanger tube temperature being small after startup.

[0056] S12: Determine whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature, where the first exhaust gas temperature is the exhaust gas temperature when the control target parameter changes, and the second exhaust gas temperature is the exhaust gas temperature after the first preset duration from when the control target parameter changes.

[0057] The variable-frequency air conditioner control method provided by the embodiments of the present application changes target parameters such as the indoor fan speed or the outdoor fan speed after triggering the exhaust gas temperature sensor failure detection program, and determines whether the exhaust gas temperature sensor fails according to the exhaust gas temperature before and after the change of the target parameter. The solution of the present application can detect the failure of the exhaust gas temperature sensor in time, avoid situations such as an increase in system pressure, a decrease in refrigerant flow, and compressor idling, and ensure the stable operation of the air conditioner system. By detecting and processing sensor failure problems in time, it effectively prevents the occurrence of abnormal system operation and potential safety hazards, and improves the overall reliability of the air conditioner system.

[0058] Based on the same inventive concept, as Figure 2 shown, the present application provides a specific variable-frequency air conditioner control method, including:

[0059] S21: Obtain the exhaust gas temperature within the target time period;

[0060] The exhaust gas temperature is the temperature value obtained through the exhaust gas temperature sensor.

[0061] In one embodiment, the target time period is the time period from when the variable-frequency air conditioner starts running to running for the second preset duration. Since the exhaust gas temperature changes most violently after startup, it is possible to accurately judge whether there is a possibility of failure through the exhaust gas temperature in the target time period.

[0062] In another embodiment, the target time period is the time period after startup, that is, pre-judgment needs to be performed at any time after startup. It can effectively prevent the situation where the exhaust gas temperature sensor is normal at startup, but fails during stable operation.

[0063] S22: When the exhaust gas temperature meets the preset conditions, trigger the exhaust gas temperature sensor failure detection program.

[0064] In one embodiment, the change value of the exhaust gas temperature within the target period is calculated, and the change value of the exhaust gas temperature is the absolute value of the difference between the exhaust gas temperature at the current moment and the exhaust gas temperature at the previous moment;

[0065] When the change value of the exhaust gas temperature is less than the preset change value of the exhaust gas temperature, it is determined that the exhaust gas temperature meets the preset condition; when the change value of the exhaust gas temperature is greater than or equal to the preset change value of the exhaust gas temperature, it is determined that the exhaust gas temperature does not meet the preset condition.

[0066] That is, in this embodiment, it is judged whether the exhaust gas temperature fails through the front and back change values of the exhaust gas temperature. When the exhaust gas temperature sensor fails, the detected value of the exhaust gas temperature remains basically unchanged. However, since the exhaust gas temperature may also remain unchanged during the stable operation of the air conditioner, further determination is required, that is, triggering the exhaust gas temperature sensor failure detection program.

[0067] In another embodiment, the difference between the exhaust gas temperature and the heat exchanger tube temperature within the target period is calculated;

[0068] When the difference between the exhaust gas temperature and the heat exchanger tube temperature is less than the preset difference, it is determined that the exhaust gas temperature meets the preset condition; when the difference between the exhaust gas temperature and the heat exchanger tube temperature is greater than or equal to the preset difference, it is determined that the exhaust gas temperature does not meet the preset condition.

[0069] That is, in this embodiment, it is judged whether the exhaust gas temperature sensor fails through the difference between the exhaust gas temperature and the heat exchanger tube temperature. When both the exhaust gas temperature sensor and the heat exchanger tube temperature fail, the difference between the exhaust gas temperature and the heat exchanger tube temperature is relatively small. Therefore, it is possible to preliminarily judge whether the exhaust gas temperature sensor fails through the difference between the exhaust gas temperature and the heat exchanger tube temperature. However, due to human factors or environmental factors, when the difference between the exhaust gas temperature and the heat exchanger tube temperature is less than the preset difference, it may be a normal situation, so further determination is required, that is, triggering the exhaust gas temperature sensor failure detection program.

[0070] S23: After triggering the exhaust gas temperature sensor failure detection program, control the target parameter to change, and the target parameter includes the indoor fan speed or the outdoor fan speed;

[0071] When the target parameter is the indoor fan speed, control the target parameter to change to control the indoor fan to increase or decrease the speed.

[0072] When the target parameter is the outdoor fan speed, control the target parameter to change to control the outdoor fan to increase or decrease the speed.

[0073] The reason for this application to adjust the indoor fan speed or the outdoor fan speed is that during the normal operation of the air conditioner, when the indoor fan speed or the outdoor fan speed changes, the heat exchange capacity of the heat exchanger of the indoor unit or the outdoor unit changes, so the exhaust gas temperature will change.

[0074] It should be specifically noted that since the change in the indoor fan speed may be perceived by the user when the air conditioner is operating, as an optimal implementation manner of the embodiment of the present application, controlling the change in the outdoor fan speed can not affect the comfort of the indoor air.

[0075] S24: Determine whether the exhaust temperature sensor fails according to the exhaust temperature difference between the first exhaust temperature and the second exhaust temperature, where the first exhaust temperature is the exhaust temperature when the control target parameter changes, and the second exhaust temperature is the exhaust temperature after the first preset duration when the control target parameter changes.

[0076] In one embodiment, determining whether the exhaust temperature sensor fails according to the exhaust temperature difference between the first exhaust temperature and the second exhaust temperature includes:

[0077] Obtain the operating mode of the variable-frequency air conditioner and the change manner of the target parameter, where the operating mode includes a cooling mode and a heating mode, and the change manner includes increasing the wind speed and decreasing the wind speed;

[0078] Determine the theoretical exhaust temperature difference based on the operating mode, the target parameter, and the change manner, where the theoretical exhaust temperature difference includes positive and negative values and magnitudes;

[0079] When the exhaust temperature difference is different from the theoretical exhaust temperature difference, determine that the exhaust temperature sensor fails; when the exhaust temperature difference is the same as the theoretical exhaust temperature difference, determine that the exhaust temperature sensor is normal. In practical applications, generally only the positive and negative are considered. If the positive and negative are different from the theory, it is determined to be a failure.

[0080] Specifically, when the target parameter is the outdoor fan speed, determining the theoretical exhaust temperature difference based on the operating mode, the target parameter, and the change manner includes:

[0081] When the operating mode is the cooling mode, if the change manner is to increase the wind speed, determine that the theoretical exhaust temperature difference is greater than 0; if the change manner is to decrease the wind speed, determine that the theoretical exhaust temperature difference is less than 0;

[0082] When the operating mode is the heating mode, if the change manner is to increase the wind speed, determine that the theoretical exhaust temperature difference is greater than 0; if the change manner is to decrease the wind speed, determine that the theoretical exhaust temperature difference is less than 0.

[0083] That is, when the target parameter is the outdoor fan speed:

[0084] In the cooling mode, if the outdoor fan speed is controlled to decrease, the change in the refrigerant temperature is small, the rate of decrease in the refrigerant temperature becomes smaller, and ultimately the refrigerant temperature increases, so the exhaust temperature increases; if the outdoor fan speed is controlled to increase, the change in the refrigerant temperature is large, the rate of decrease in the refrigerant temperature becomes larger, and ultimately the refrigerant temperature decreases, so the exhaust temperature decreases;

[0085] In the heating mode, if the outdoor fan speed is controlled to decrease, the change in the refrigerant temperature is small, the rate of increase in the refrigerant temperature becomes smaller, and ultimately the refrigerant temperature decreases, so the exhaust temperature decreases; if the outdoor fan speed is controlled to increase, the change in the refrigerant temperature is large, the rate of increase in the refrigerant temperature becomes larger, and ultimately the refrigerant temperature increases, so the exhaust temperature increases.

[0086] When the target parameter is the indoor fan speed, determining the theoretical exhaust temperature difference based on the operating mode, the target parameter, and the change method includes:

[0087] When the operating mode is the cooling mode, if the change method is to increase the speed, it is determined that the theoretical exhaust temperature difference is less than 0; if the change method is to decrease the speed, it is determined that the theoretical exhaust temperature difference is greater than 0;

[0088] When the operating mode is the heating mode, if the change method is to increase the speed, it is determined that the theoretical exhaust temperature difference is less than 0; if the change method is to decrease the speed, it is determined that the theoretical exhaust temperature difference is greater than 0.

[0089] That is, when the target parameter is the indoor fan speed:

[0090] In the cooling mode, if the indoor fan speed is controlled to decrease, the change in the refrigerant temperature is small, the rate of increase in the refrigerant temperature becomes smaller, and ultimately the refrigerant temperature decreases, so the exhaust temperature decreases; if the indoor fan speed is controlled to increase, the change in the refrigerant temperature is large, the rate of increase in the refrigerant temperature becomes larger, and ultimately the refrigerant temperature increases, so the exhaust temperature increases;

[0091] In the heating mode, if the indoor fan speed is controlled to decrease, the change in the refrigerant temperature is small, the rate of decrease in the refrigerant temperature becomes smaller, and ultimately the refrigerant temperature increases, so the exhaust temperature increases; if the indoor fan speed is controlled to increase, the change in the refrigerant temperature is large, the rate of decrease in the refrigerant temperature becomes larger, and ultimately the refrigerant temperature decreases, so the exhaust temperature decreases.

[0092] That is, according to the operating mode and the change method in the embodiments of the present application, the before and after changes in the exhaust temperature can be determined. It can not only accurately judge the failure when the exhaust temperature sensor cannot obtain the exhaust temperature, but also judge when the exhaust temperature sensor can obtain the exhaust temperature sensor, but the obtained exhaust temperature sensor is incorrect.

[0093] However, in actual use, generally, the failure of the exhaust gas temperature sensor only means that it cannot obtain data (fall off, power off, or be damaged). Therefore, the method of judging whether it fails by using the operating mode and the change mode in the above embodiments is relatively complex.

[0094] Based on this, in another embodiment, determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature includes:

[0095] Calculating the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature;

[0096] When the absolute value of the exhaust gas temperature difference is less than the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor fails; when the absolute value of the exhaust gas temperature difference is greater than or equal to the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor is normal.

[0097] That is, in the embodiment of the present application, it is only necessary to compare the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature with the preset exhaust gas temperature difference to determine whether the exhaust gas temperature sensor fails, without the need to obtain the operating mode and the change mode.

[0098] However, due to environmental factors and human factors, it may also cause misjudgment. To ensure accurate detection, as a preferred implementation manner of the embodiment of the present application, the control target parameter is changed to change once every preset period, and determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature includes:

[0099] Calculating the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature within the same period;

[0100] When the absolute value of the exhaust gas temperature difference within each period is less than the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor fails; when the absolute value of the exhaust gas temperature difference within any period is greater than or equal to the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor is normal.

[0101] It should be noted that in some embodiments, within one period, the adjusted target parameter does not recover. In another embodiment, within each period, after calculating the exhaust gas temperature difference, it is restored to the target parameter before the change.

[0102] That is, through multiple detections, it is only when the exhaust gas temperature difference in each detection is less than the preset exhaust gas temperature difference that it is determined that the exhaust gas temperature sensor fails, reducing the misjudgment rate.

[0103] The variable-frequency air conditioner control method provided by the embodiments of this application obtains the exhaust temperature detected by the exhaust temperature sensor. When the exhaust temperature meets the preset conditions, it triggers the exhaust temperature sensor failure detection program. After triggering the exhaust temperature sensor failure detection program, it changes the target parameter, and determines whether the exhaust temperature sensor fails according to the exhaust temperature before and after the change of the target parameter. The solution of this application can detect the failure of the exhaust temperature sensor in time, avoid situations such as increased system pressure, reduced refrigerant flow, and compressor idling, and ensure the stable operation of the air conditioner system. By detecting and handling sensor failure problems in time, it effectively prevents the occurrence of abnormal system operation and potential safety hazards, and improves the overall reliability of the air conditioner system.

[0104] To illustrate the solution of this application more specifically, a specific variable-frequency air conditioner control method is provided below. By introducing the outdoor unit fan as a detection tool, the accuracy and reliability of the temperature sensor detection are improved.

[0105] The refrigerant system of the air conditioner mainly involves three key components: the compressor, the electronic expansion valve, and the indoor and outdoor fans. The corresponding control parameters are frequency, opening degree, and fan speed respectively. The order of the influence degree of the control parameters on the system is: frequency > opening degree > fan speed. When the air conditioner is operating stably, the adjustment of the compressor frequency and the opening degree of the electronic expansion valve is likely to cause large fluctuations in the refrigerant system, resulting in changes in the indoor air outlet temperature, thereby affecting the comfort experience of users. The adjustment of the indoor unit fan speed will cause changes in the volume, which is easily noticed by users.

[0106] Based on the above analysis, this embodiment proposes to use the outdoor unit fan as a detection tool. This solution can not only effectively detect the working state of the exhaust temperature sensor, but also reduce the interference to the system stability, and has good practical value.

[0107] When the situation of simultaneous failure of the above temperature sensors occurs, the temperature sensor cannot accurately reflect the temperature change of the system. The following is the control logic for formulating the exhaust temperature sensor failure detection based on this principle.

[0108] To improve the accuracy of temperature sensor failure detection and reduce misjudgment, this proposal adopts a control logic of staged detection. This logic consists of two stages: preliminary determination and secondary determination, specifically as Figure 3 shown:

[0109] The initial preliminary determination program is only executed once within 10 minutes after the system is powered on. When any of the following conditions is met, the subsequent secondary determination program will be triggered:

[0110] If it is detected that the change value of the exhaust temperature compared with that before startup is less than α, or the difference between the exhaust temperature and the pipe temperature is less than β, the exhaust temperature sensor effectiveness secondary determination program will be triggered.

[0111] The specific steps of the secondary determination program are as follows:

[0112] 1. Record the current exhaust gas temperature value (denoted as T1), then reduce the rotational speed of the outdoor unit fan. After maintaining stable operation for several minutes, record the new exhaust gas temperature value (denoted as T2), and calculate whether the absolute value of the temperature difference between the two times is less than γ. Then restore the initial fan rotational speed.

[0113] 2. Repeat the above operation to complete n detection cycles. If the temperature difference in each detection is less than γ within n cycles, it is determined that the exhaust gas temperature sensor has failed, and a fault code prompt is triggered.

[0114] Compared with the existing method, this determination program can more accurately identify the sensor failure situation through periodic detection and comparison, reducing the possibility of misjudgment and missed judgment. Using the outdoor unit fan as a detection tool avoids interfering with the system operation state and ensures the stable operation of the air conditioning system. By detecting and handling the sensor failure problem in a timely manner, it effectively prevents the occurrence of abnormal system operation and potential safety hazards, improving the overall reliability of the air conditioning system.

[0115] Based on the same inventive concept, an embodiment of the present application provides a variable frequency air conditioner control device 40, including:

[0116] An exhaust gas temperature acquisition module 41, configured to acquire the exhaust gas temperature within a target time period;

[0117] Wherein the exhaust gas temperature is the temperature value acquired by the exhaust gas temperature sensor.

[0118] In one embodiment, the target time period is the time period from when the variable frequency air conditioner starts running to the second preset duration of operation. Because the exhaust gas temperature changes most violently after startup, the exhaust gas temperature within the target time period can accurately determine whether there is a possibility of failure.

[0119] In another embodiment, the target time period is the time period after startup, that is, pre - determination needs to be performed at any time after startup. This can effectively prevent the situation where the exhaust gas temperature sensor is normal at startup but fails during stable operation.

[0120] A failure detection trigger module 42, configured to trigger an exhaust gas temperature sensor failure detection program when the exhaust gas temperature meets a preset condition.

[0121] In one embodiment, calculate the change value of the exhaust gas temperature within the target time period, and the change value of the exhaust gas temperature is the absolute value of the difference between the exhaust gas temperature at the current moment and the exhaust gas temperature at the previous moment;

[0122] When the change value of the exhaust gas temperature is less than the preset exhaust gas temperature change value, it is determined that the exhaust gas temperature meets the preset conditions; when the change value of the exhaust gas temperature is greater than or equal to the preset exhaust gas temperature change value, it is determined that the exhaust gas temperature does not meet the preset conditions.

[0123] That is, in this embodiment, it is determined whether the exhaust gas temperature fails by the change value of the exhaust gas temperature before and after. When the exhaust gas temperature sensor fails, the detected value of the exhaust gas temperature remains basically unchanged. However, since the exhaust gas temperature may also remain unchanged during the stable operation of the air conditioner, further determination is required, that is, triggering the exhaust gas temperature sensor failure detection program.

[0124] In another embodiment, the difference between the exhaust gas temperature and the heat exchanger tube temperature within the target time period is calculated;

[0125] When the difference between the exhaust gas temperature and the heat exchanger tube temperature is less than the preset difference, it is determined that the exhaust gas temperature meets the preset conditions; when the difference between the exhaust gas temperature and the heat exchanger tube temperature is greater than or equal to the preset difference, it is determined that the exhaust gas temperature does not meet the preset conditions.

[0126] That is, in this embodiment, it is determined whether the exhaust gas temperature sensor fails by the difference between the exhaust gas temperature and the heat exchanger tube temperature. When both the exhaust gas temperature sensor and the heat exchanger tube temperature fail, the difference between the exhaust gas temperature and the heat exchanger tube temperature is relatively small. Therefore, it is possible to preliminarily determine whether the exhaust gas temperature sensor fails by the difference between the exhaust gas temperature and the heat exchanger tube temperature. However, due to human factors or environmental factors, it may be normal when the difference between the exhaust gas temperature and the heat exchanger tube temperature is less than the preset difference. Therefore, further determination is required, that is, triggering the exhaust gas temperature sensor failure detection program.

[0127] The target parameter change module 43 is used to control the change of the target parameter after triggering the exhaust gas temperature sensor failure detection program, and the target parameter includes the indoor fan speed or the outdoor fan speed;

[0128] When the target parameter is the indoor fan speed, controlling the change of the target parameter means controlling the indoor fan to increase or decrease the speed.

[0129] When the target parameter is the outdoor fan speed, controlling the change of the target parameter means controlling the outdoor fan to increase or decrease the speed.

[0130] The reason for this application to adjust the indoor fan speed or the outdoor fan speed is that during the normal operation of the air conditioner, when the indoor fan speed or the outdoor fan speed changes, the heat exchange capacity of the heat exchanger of the indoor unit or the outdoor unit changes, so the exhaust gas temperature will change.

[0131] It should be specifically noted that since the change in the indoor fan speed may be perceived by the user when the air conditioner is operating, as an optimal implementation manner of the embodiment of the present application, controlling the change in the outdoor fan speed can not affect the comfort of the indoor air.

[0132] The sensor failure determination module 44 is configured to determine whether the exhaust temperature sensor fails according to the exhaust temperature difference between the first exhaust temperature and the second exhaust temperature, where the first exhaust temperature is the exhaust temperature when the control target parameter changes, and the second exhaust temperature is the exhaust temperature after the first preset duration when the control target parameter changes.

[0133] In one embodiment, determining whether the exhaust temperature sensor fails according to the exhaust temperature difference between the first exhaust temperature and the second exhaust temperature includes:

[0134] Obtain the operation mode of the variable-frequency air conditioner and the change manner of the target parameter, where the operation mode includes a cooling mode and a heating mode, and the change manner includes increasing the wind speed and decreasing the wind speed;

[0135] Determine a theoretical exhaust temperature difference based on the operation mode, the target parameter, and the change manner, where the theoretical exhaust temperature difference includes positive and negative values and magnitudes;

[0136] When the exhaust temperature difference is different from the theoretical exhaust temperature difference, it is determined that the exhaust temperature sensor fails; when the exhaust temperature difference is the same as the theoretical exhaust temperature difference, it is determined that the exhaust temperature sensor is normal. In practical applications, generally only the positive and negative are considered. If the positive and negative are different from the theory, it is determined that there is a failure.

[0137] Specifically, when the target parameter is the outdoor fan speed, determining the theoretical exhaust temperature difference based on the operation mode, the target parameter, and the change manner includes:

[0138] When the operation mode is the cooling mode, if the change manner is to increase the wind speed, it is determined that the theoretical exhaust temperature difference is greater than 0; if the change manner is to decrease the wind speed, it is determined that the theoretical exhaust temperature difference is less than 0;

[0139] When the operation mode is the heating mode, if the change manner is to increase the wind speed, it is determined that the theoretical exhaust temperature difference is greater than 0; if the change manner is to decrease the wind speed, it is determined that the theoretical exhaust temperature difference is less than 0.

[0140] That is, when the target parameter is the outdoor fan speed:

[0141] In the cooling mode, if the outdoor fan speed is controlled to decrease, the refrigerant temperature changes little, the decrease amplitude of the refrigerant temperature becomes smaller, and finally the refrigerant temperature increases, so the exhaust temperature increases; if the outdoor fan speed is controlled to increase, the refrigerant temperature changes greatly, the decrease amplitude of the refrigerant temperature becomes larger, and finally the refrigerant temperature decreases, so the exhaust temperature decreases.

[0142] In the heating mode, if the outdoor fan speed is controlled to decrease, the refrigerant temperature changes little, the increase amplitude of the refrigerant temperature becomes smaller, and finally the refrigerant temperature decreases, so the exhaust temperature decreases; if the outdoor fan speed is controlled to increase, the refrigerant temperature changes greatly, the increase amplitude of the refrigerant temperature becomes larger, and finally the refrigerant temperature increases, so the exhaust temperature increases.

[0143] When the target parameter is the indoor fan speed, determining the theoretical exhaust temperature difference based on the operating mode, the target parameter, and the change method includes:

[0144] When the operating mode is the cooling mode, if the change method is to increase the wind speed, it is determined that the theoretical exhaust temperature difference is less than 0; if the change method is to decrease the wind speed, it is determined that the theoretical exhaust temperature difference is greater than 0.

[0145] When the operating mode is the heating mode, if the change method is to increase the wind speed, it is determined that the theoretical exhaust temperature difference is less than 0; if the change method is to decrease the wind speed, it is determined that the theoretical exhaust temperature difference is greater than 0.

[0146] That is, when the target parameter is the indoor fan speed:

[0147] In the cooling mode, if the indoor fan speed is controlled to decrease, the refrigerant temperature changes little, the increase amplitude of the refrigerant temperature becomes smaller, and finally the refrigerant temperature decreases, so the exhaust temperature decreases; if the indoor fan speed is controlled to increase, the refrigerant temperature changes greatly, the increase amplitude of the refrigerant temperature becomes larger, and finally the refrigerant temperature increases, so the exhaust temperature increases.

[0148] In the heating mode, if the indoor fan speed is controlled to decrease, the refrigerant temperature changes little, the decrease amplitude of the refrigerant temperature becomes smaller, and finally the refrigerant temperature increases, so the exhaust temperature increases; if the indoor fan speed is controlled to increase, the refrigerant temperature changes greatly, the decrease amplitude of the refrigerant temperature becomes larger, and finally the refrigerant temperature decreases, so the exhaust temperature decreases.

[0149] That is, according to the operating mode and the change method in the embodiments of the present application, the before-and-after change of the exhaust temperature can be determined. It can not only accurately judge the failure when the exhaust temperature sensor cannot obtain the exhaust temperature, but also judge when the exhaust temperature sensor can obtain the exhaust temperature sensor, but the obtained exhaust temperature sensor is incorrect.

[0150] However, in actual use, generally, the failure of the exhaust gas temperature sensor only means that it cannot obtain data (fall off, power off, or be damaged). Therefore, the method of judging whether it fails by using the operating mode and the changing mode in the above embodiments is relatively complex.

[0151] Based on this, in another embodiment, determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature includes:

[0152] Calculating the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature;

[0153] When the absolute value of the exhaust gas temperature difference is less than the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor fails; when the absolute value of the exhaust gas temperature difference is greater than or equal to the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor is normal.

[0154] That is, in the embodiment of the present application, it only needs to compare the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature with the preset exhaust gas temperature difference to determine whether the exhaust gas temperature sensor fails, without the need to obtain the operating mode and the changing mode.

[0155] However, due to environmental factors and human factors, it may also cause misjudgment. To ensure accurate detection, as a preferred implementation mode of the embodiment of the present application, the control target parameter is changed to change once every preset period, and determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature includes:

[0156] Calculating the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature within the same period;

[0157] When the absolute value of the exhaust gas temperature difference within each period is less than the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor fails; when the absolute value of the exhaust gas temperature difference within any period is greater than or equal to the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor is normal.

[0158] That is, through multiple detections, the exhaust gas temperature sensor will be determined to fail only when the exhaust gas temperature difference in each detection is less than the preset exhaust gas temperature difference, reducing the misjudgment rate.

[0159] The variable-frequency air conditioner control device provided by the embodiment of the present application can obtain the exhaust gas temperature detected by the exhaust gas temperature sensor, trigger the exhaust gas temperature sensor failure detection program when the exhaust gas temperature meets the preset conditions; after triggering the exhaust gas temperature sensor failure detection program, change the target parameter, and determine whether the exhaust gas temperature sensor fails according to the exhaust gas temperature before and after the change of the target parameter. The solution of the present application can detect the failure of the exhaust gas temperature sensor in time, avoid situations such as increased system pressure, reduced refrigerant flow, and compressor idling, and ensure the stable operation of the air conditioner system. By detecting and processing the sensor failure problem in time, it can effectively prevent the occurrence of abnormal system operation and potential safety hazards, and improve the overall reliability of the air conditioner system.

[0160] Based on the same inventive concept, as Figure 5 shown, the present application also provides a variable-frequency air conditioner control system 50, including:

[0161] At least one processor 51 and at least one memory 52;

[0162] The memory stores the executable instructions of the processor;

[0163] The processor is configured to execute the variable-frequency air conditioner control method provided by the above embodiment.

[0164] The variable-frequency air conditioner control system provided by the embodiment of the present application stores the executable instructions of the processor through the memory. When the executable instructions are executed, the processor can obtain the exhaust gas temperature detected by the exhaust gas temperature sensor, trigger the exhaust gas temperature sensor failure detection program when the exhaust gas temperature meets the preset conditions; after triggering the exhaust gas temperature sensor failure detection program, change the target parameter, and determine whether the exhaust gas temperature sensor fails according to the exhaust gas temperature before and after the change of the target parameter. The solution of the present application can detect the failure of the exhaust gas temperature sensor in time, avoid situations such as increased system pressure, reduced refrigerant flow, and compressor idling, and ensure the stable operation of the air conditioner system. By detecting and processing the sensor failure problem in time, it can effectively prevent the occurrence of abnormal system operation and potential safety hazards, and improve the overall reliability of the air conditioner system.

[0165] Based on the same inventive concept, the present application also provides a variable-frequency air conditioner, which applies the variable-frequency air conditioner control method provided by any of the above embodiments.

[0166] The variable-frequency air conditioner provided by the embodiment of the present application can obtain the exhaust temperature detected by the exhaust temperature sensor by applying the variable-frequency air conditioner control method provided in any of the above embodiments. When the exhaust temperature meets the preset conditions, the exhaust temperature sensor failure detection program is triggered; after triggering the exhaust temperature sensor failure detection program, the target parameter is changed, and it is determined whether the exhaust temperature sensor fails according to the exhaust temperature before and after the change of the target parameter. The solution of the present application can detect the failure of the exhaust temperature sensor in time, avoid situations such as increased system pressure, reduced refrigerant flow, and compressor idling, and ensure the stable operation of the air conditioner system. By detecting and handling the sensor failure problem in time, the occurrence of abnormal system operation and potential safety hazards can be effectively prevented, and the overall reliability of the air conditioner system can be improved.

[0167] It should be noted that in the description of the present application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality" refers to at least two.

[0168] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not detailed in some embodiments can be found in the same or similar content in other embodiments.

Claims

1. A variable-frequency air conditioner control method, characterized in that, Including: When triggering the exhaust gas temperature sensor failure detection program, controlling the target parameter to change, where the target parameter includes the indoor fan speed or the outdoor fan speed; Determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature, where the first exhaust gas temperature is the exhaust gas temperature when the target parameter changes, and the second exhaust gas temperature is the exhaust gas temperature after the first preset duration when the target parameter changes.

2. The method according to claim 1, wherein The determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature includes: Obtaining the operating mode of the variable-frequency air conditioner and the changing manner of the target parameter, where the operating mode includes the cooling mode and the heating mode, and the changing manner includes increasing the wind speed and decreasing the wind speed; Determining the theoretical exhaust gas temperature difference based on the operating mode, the target parameter, and the changing manner, where the theoretical exhaust gas temperature difference includes positive and negative values and magnitudes; When the exhaust gas temperature difference is different from the theoretical exhaust gas temperature difference, determining that the exhaust gas temperature sensor fails; when the exhaust gas temperature difference is the same as the theoretical exhaust gas temperature difference, determining that the exhaust gas temperature sensor is normal.

3. The method according to claim 2, characterized in that, When the target parameter is the outdoor fan speed, determining the theoretical exhaust gas temperature difference based on the operating mode, the target parameter, and the changing manner includes: When the operating mode is the cooling mode, if the changing manner is increasing the wind speed, determining that the theoretical exhaust gas temperature difference is greater than 0; if the changing manner is decreasing the wind speed, determining that the theoretical exhaust gas temperature difference is less than 0; When the operating mode is the heating mode, if the changing manner is increasing the wind speed, determining that the theoretical exhaust gas temperature difference is greater than 0; if the changing manner is decreasing the wind speed, determining that the theoretical exhaust gas temperature difference is less than 0.

4. The method according to claim 2, characterized in that When the target parameter is the indoor fan speed, determining the theoretical exhaust gas temperature difference based on the operating mode, the target parameter, and the changing manner includes: When the operating mode is the cooling mode, if the changing manner is increasing the wind speed, determining that the theoretical exhaust gas temperature difference is less than 0; if the changing manner is decreasing the wind speed, determining that the theoretical exhaust gas temperature difference is greater than 0; When the operating mode is the heating mode, if the changing manner is increasing the wind speed, determining that the theoretical exhaust gas temperature difference is less than 0; if the changing manner is decreasing the wind speed, determining that the theoretical exhaust gas temperature difference is greater than 0.

5. The method according to claim 1, wherein The determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature includes: Calculating the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature; When the absolute value of the exhaust gas temperature difference is less than the preset exhaust gas temperature difference, determining that the exhaust gas temperature sensor fails; when the absolute value of the exhaust gas temperature difference is greater than or equal to the preset exhaust gas temperature difference, determining that the exhaust gas temperature sensor is normal.

6. The method according to claim 1, wherein The controlling the target parameter to change is to change the target parameter at intervals of a preset period, and the determining whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature includes: Calculate the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature within the same cycle; When the absolute value of the exhaust gas temperature difference within each cycle is less than the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor fails; when the absolute value of the exhaust gas temperature difference within any cycle is greater than or equal to the preset exhaust gas temperature difference, it is determined that the exhaust gas temperature sensor is normal.

7. The method according to claim 1, characterized in that, It further includes: Obtain the exhaust gas temperature within the target period; When the exhaust gas temperature within the target period meets the preset conditions, trigger the exhaust gas temperature sensor failure detection program.

8. The method according to claim 7, characterized in that It further includes: Calculate the exhaust gas temperature change value within the target period, where the exhaust gas temperature change value is the absolute value of the difference between the exhaust gas temperature at the current moment and the exhaust gas temperature at the previous moment; When the exhaust gas temperature change value is less than the preset exhaust gas temperature change value, it is determined that the exhaust gas temperature meets the preset conditions; when the exhaust gas temperature change value is greater than or equal to the preset exhaust gas temperature change value, it is determined that the exhaust gas temperature does not meet the preset conditions.

9. The method according to claim 7, wherein: It further includes: Calculate the difference between the exhaust gas temperature and the heat exchanger tube temperature within the target period; When the difference between the exhaust gas temperature and the heat exchanger tube temperature is less than the preset difference, it is determined that the exhaust gas temperature meets the preset conditions; When the difference between the exhaust gas temperature and the heat exchanger tube temperature is greater than or equal to the preset difference, it is determined that the exhaust gas temperature does not meet the preset conditions.

10. A variable-frequency air conditioner control device, characterized in that, It includes: A target parameter change module, configured to control the change of the target parameter when triggering the exhaust gas temperature sensor failure detection program, where the target parameter includes the indoor fan speed or the outdoor fan speed; A sensor failure determination module, configured to determine whether the exhaust gas temperature sensor fails according to the exhaust gas temperature difference between the first exhaust gas temperature and the second exhaust gas temperature, where the first exhaust gas temperature is the exhaust gas temperature when controlling the change of the target parameter, and the second exhaust gas temperature is the exhaust gas temperature at the first preset duration after controlling the change of the target parameter.

11. A variable frequency air conditioner control system, characterized in that, It includes: At least one processor and at least one memory; The memory stores the executable instructions of the processor; The processor is configured to execute the method according to any one of claims 1-9.

12. A variable-frequency air conditioner, characterized in that: Apply the method according to any one of claims 1-9.

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