An air conditioner self-checking method

Abstract

The application provides an air conditioner self-checking method. When the indoor environment temperature is higher than the refrigeration starting temperature, normal refrigeration mode detection is performed; when the indoor environment temperature is lower than the heating starting temperature, normal heating mode detection is performed; and when the indoor environment temperature is lower than the refrigeration starting temperature and the indoor environment temperature is higher than the heating starting temperature, a separate design of the detection method is performed to ensure normal operation of the air conditioner. The application can complete self-checking of the refrigeration mode and the heating mode under any indoor environment temperature, does not cause indoor overload or compressor overcurrent shutdown, does not cause damage to the outdoor unit driving board, ensures normal detection and normal operation of the air conditioner. Meanwhile, the application does not need to increase hardware cost and can be realized by using the existing hardware of the air conditioner.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioner fault detection, and particularly relates to an air conditioner fault automatic detection method. BACKGROUND

[0002] There are more and more air conditioning modes, and the performance of the air conditioner is generally judged by collecting data during the operation of the air conditioner. Many self-checking functions now judge whether the current test is within the normal range according to theory or previous test data.

[0003] However, the current air conditioner generally sets a cooling start temperature and a heating start temperature, and the heating mode can only be started below the heating start temperature, and the cooling mode can only be started above the cooling start temperature. The reason why the heating mode cannot be started above the heating start temperature is that the inner coil temperature will be relatively high in the heating mode, and starting the heating mode above the heating start temperature will cause the indoor coil to overheat, which will generally cause the indoor overload and thus shut down. If forced to run, it is easy to cause the compressor to overcurrent and shut down, and the outdoor unit drive board that controls the operation of the compressor is seriously overloaded, which may cause irreversible damage to the power device. The reason why the cooling mode cannot be started below the cooling start temperature is to maintain the energy-saving effect of the household air conditioner.

[0004] Therefore, the detection method of the existing air conditioner cannot detect the heating mode when the indoor environment temperature is higher than the heating set temperature, and cannot detect the cooling mode when the outdoor environment temperature is lower than the cooling set temperature.

[0005] In addition, in the low-temperature heating mode, the indoor electric heating is started synchronously, and if the heat pump heating fails, the user cannot feel the compressor failure, which will cause the power consumption of the air conditioner to rise.

[0006] Similarly, if the outdoor fan fails, it cannot be judged in some modes, and can only be observed by a person whether it is normal.

[0007] The existing self-checking function generally relies on increasing sensors to judge according to theoretical data and experience data. However, increasing sensors will increase the cost, and relying on sensors or theoretical data and experience data is to judge during the work process, which can only be for a single mode. If a problem occurs, it cannot be determined which specific part is the problem.

[0008] The above information disclosed in the background of the application is only used to increase the understanding of the background of the application, and therefore, it can include prior art known by those skilled in the art. SUMMARY

[0009] The present application aims at the above-mentioned problems in the prior art, and provides an air conditioner self-checking method to solve the technical problems that the existing air conditioner cannot perform heating detection when the indoor environment temperature is higher than the heating set temperature, and cannot perform cooling detection when the outdoor environment temperature is lower than the cooling set temperature.

[0010] To achieve the above technical purposes, the present application adopts the following technical solutions:

[0011] An air conditioner self-checking method, the method comprising:

[0012] A cooling mode self-checking method:

[0013] Detecting the indoor environment temperature;

[0014] When the indoor environment temperature is higher than the cooling start-up temperature, running the cooling mode according to the cooling set temperature, detecting the indoor coil temperature, and judging that the cooling mode is normal when the indoor coil temperature changes in accordance with the set standard within a specific time period, otherwise judging that the cooling mode is abnormal;

[0015] When the indoor environment temperature is lower than the cooling start-up temperature, detecting the indoor coil temperature, controlling the compressor to run at a medium-low frequency so that the indoor coil temperature is lower than the set temperature, and judging that the cooling mode is normal when the indoor coil temperature changes in accordance with the set standard within a specific time period and the indoor coil temperature is lower than the set temperature at the end of the specific time, otherwise judging that the cooling mode is abnormal;

[0016] A heating mode self-checking method:

[0017] Detecting the indoor environment temperature;

[0018] When the indoor environment temperature is lower than the heating start-up temperature, running the heating mode according to the heating set temperature, detecting the indoor coil temperature, and judging that the heating mode is normal when the indoor coil temperature reaches the first set temperature after a specific time, otherwise judging that the heating mode is abnormal;

[0019] When the indoor environment temperature is higher than the heating start-up temperature, controlling the compressor to run at a medium-low frequency, detecting the indoor coil temperature, and judging that the heating mode is normal when the indoor coil temperature reaches the second set temperature after a specific time, otherwise judging that the heating mode is abnormal.

[0020] The air conditioner self-checking method as described above, in the cooling mode self-checking method and the heating mode self-checking method, the indoor fan speed is controlled to be the maximum speed, and the outdoor fan speed is controlled to be a medium-high speed.

[0021] The air conditioner self-checking method as described above, in the cooling mode self-checking method, the opening degree of the electronic expansion valve is controlled to be the maximum opening degree*2 / 3 or the maximum opening degree*2 / 3±set threshold.

[0022] The air conditioner self-checking method as described above, in the heating mode self-checking method, the opening degree of the electronic expansion valve is controlled to be the maximum opening degree / 2 or the maximum opening degree / 2± a set threshold value.

[0023] The air conditioner self-checking method as described above, the refrigeration set temperature is a refrigeration start-up temperature, the heating set temperature is a heating start-up temperature, and the low frequency band is 30-50 Hz.

[0024] The air conditioner self-checking method as described above, the refrigeration mode self-checking method and the heating mode self-checking method further comprise an indoor fan self-checking method before the refrigeration mode self-checking method and the heating mode self-checking method:

[0025] The indoor fan is controlled to run at a set gear;

[0026] The rotation speed of the indoor fan is detected, and when the detected rotation speed of the indoor fan meets the set gear, it is determined that the indoor fan is normal, otherwise it is determined that the indoor fan is abnormal.

[0027] The air conditioner self-checking method as described above, the refrigeration mode self-checking method and the heating mode self-checking method further comprise an indoor electric heating module self-checking method before the refrigeration mode self-checking method and the heating mode self-checking method:

[0028] The indoor electric heating module is controlled to be powered on and the indoor fan is controlled to rotate;

[0029] The indoor coil temperature is detected, and when the indoor coil temperature rises, it is determined that the indoor electric heating module is normal, otherwise it is determined that the indoor electric heating module is abnormal.

[0030] The air conditioner self-checking method as described above, the refrigeration mode self-checking method and the heating mode self-checking method further comprise an outdoor fan self-checking method before the refrigeration mode self-checking method and the heating mode self-checking method:

[0031] The rotation speed of the outdoor fan is gradually increased according to a set speed increase;

[0032] The rotation speed of the outdoor fan is detected, and when the speed increase of the detected rotation speed of the outdoor fan is within a set speed increase threshold value range, it is determined that the outdoor fan is normal, otherwise it is determined that the outdoor fan is abnormal.

[0033] The air conditioner self-checking method as described above, the refrigeration mode self-checking method and the heating mode self-checking method further comprise an electronic expansion valve self-checking method before the refrigeration mode self-checking method and the heating mode self-checking method:

[0034] The opening degree of the electronic expansion valve is controlled and the operation frequency of the compressor is controlled;

[0035] The exhaust temperature of the compressor is detected, and whether the electronic expansion valve is normal is determined according to the exhaust temperature.

[0036] The air conditioner self-checking method as described above, the electronic expansion valve self-checking method is judged as normal when the following conditions are met, otherwise, the electronic expansion valve is judged as abnormal:

[0037] The running frequency of the compressor is controlled to be unchanged, the discharge temperature is increased when the electronic expansion valve opening degree is controlled to be the first opening degree, the discharge temperature is decreased when the electronic expansion valve opening degree is controlled to increase from the first opening degree to the second opening degree, and the discharge temperature is increased when the electronic expansion valve is controlled to decrease from the second opening degree to the first opening degree.

[0038] Compared with the prior art, the advantages and positive effects of the air conditioner self-checking method of the present application are as follows: the air conditioner self-checking method of the present application comprises a refrigeration mode self-checking method and a heating mode self-checking method, the refrigeration mode self-checking method is as follows: detecting the indoor environment temperature; when the indoor environment temperature is higher than the refrigeration start-up temperature, operating the refrigeration mode according to the refrigeration set temperature, detecting the indoor coil temperature, and judging the refrigeration mode as normal when the indoor coil temperature changes in accordance with the set standard within a specific time period, otherwise, judging the refrigeration mode as abnormal; when the indoor environment temperature is lower than the refrigeration start-up temperature, detecting the indoor coil temperature, controlling the compressor to operate at a medium-low frequency band so that the indoor coil temperature is lower than the set temperature, and judging the refrigeration mode as normal when the indoor coil temperature changes in accordance with the set standard within a specific time period and the indoor coil temperature is lower than the set temperature at the end of the specific time, otherwise, judging the refrigeration mode as abnormal. The heating mode self-checking method is as follows: detecting the indoor environment temperature; when the indoor environment temperature is lower than the heating start-up temperature, operating the heating mode according to the heating set temperature, detecting the indoor coil temperature, and judging the heating mode as normal when the indoor coil temperature reaches a first set temperature after a specific time, otherwise, judging the heating mode as abnormal; when the indoor environment temperature is higher than the heating start-up temperature, controlling the compressor to operate at a medium-low frequency band, detecting the indoor coil temperature, and judging the heating mode as normal when the indoor coil temperature reaches a second set temperature after a specific time, otherwise, judging the heating mode as abnormal. The present application detects the normal refrigeration mode when the indoor environment temperature is higher than the refrigeration start-up temperature, detects the normal heating mode when the indoor environment temperature is lower than the heating start-up temperature, and separately designs the detection methods when the indoor environment temperature is lower than the refrigeration start-up temperature and the indoor environment temperature is higher than the heating start-up temperature, so as to ensure the detection under the premise of normal operation of the air conditioner. Thus, the present application can complete the self-checking of the refrigeration mode and the heating mode at any indoor environment temperature, without causing indoor overload or compressor over-flow shutdown, without damaging the outdoor unit driving board, and ensuring normal detection and normal operation of the air conditioner. At the same time, the present application does not need to increase the hardware cost, and can be realized by using the existing hardware of the air conditioner.

[0039] Other characteristics and advantages of the present application will become more apparent after reading the specific embodiments of the present application in combination with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art based on these drawings without any creative effort.

[0041] Figure 1 The flow chart of the self-checking method for the refrigeration mode of the specific embodiment of the present application.

[0042] Figure 2 The flow chart of the self-checking method for the heating mode of the specific embodiment of the present application.

[0043] Figure 3 The flow chart of the self-checking method for the indoor fan of the specific embodiment of the present application.

[0044] Figure 4 The flow chart of the self-checking method for the outdoor fan of the specific embodiment of the present application.

[0045] Figure 5 The flow chart of the self-checking method for the electronic expansion valve of the specific embodiment of the present application.

[0046] Figure 6 The flow chart of the self-checking method for the indoor point heating module of the specific embodiment of the present application.

[0047] Figure 7 The flow chart of the self-checking method for the air conditioner of the specific embodiment of the present application. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present application will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0049] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the direction or positional relationship terms based on the direction or positional relationship shown in the drawings, which are only for the convenience of description, and are not intended to indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0050] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application.

[0051] The air conditioner needs to be detected before leaving the factory, or the air conditioner will often produce various faults during operation after being sold, and needs to be detected to determine the fault cause and maintenance. Therefore, the embodiment proposes an air conditioner self-checking method, which is completed by the air conditioner itself to determine the fault cause and can complete the detection of key components and cooling mode and heating mode with one key.

[0052] The existing air conditioner generally sets the cooling start temperature and the heating start temperature for the purpose of equipment protection and energy saving. The heating mode can only be started below the heating start temperature, and the cooling mode can only be started above the cooling start temperature. Therefore, when the indoor environment temperature is higher than the heating start temperature, the heating mode cannot be entered and self-checked, and when the indoor environment temperature is lower than the cooling start temperature, the cooling mode cannot be entered and self-checked. The air conditioner self-checking method of the embodiment is designed to solve the above problems. When the indoor environment temperature is higher than the cooling start temperature, normal cooling mode detection is performed, when the indoor environment temperature is lower than the heating start temperature, normal heating mode detection is performed, and when the indoor environment temperature is lower than the cooling start temperature and the indoor environment temperature is higher than the heating start temperature, separate design of the detection method is performed to ensure normal operation of the air conditioner.

[0053] First, the cooling mode self-checking method is described below:

[0054] Detect the indoor environment temperature.

[0055] Specifically, the indoor environment temperature is detected by the existing indoor environment temperature sensor of the air conditioner, and different cooling mode self-checking methods are determined according to the indoor environment temperature.

[0056] When the indoor environment temperature is higher than the cooling start temperature, the cooling mode is normally run according to the cooling set temperature, the indoor coil temperature is detected, and when the indoor coil temperature changes in a certain time period meet the set standard, it is judged that the cooling mode is normal, otherwise it is judged that the cooling mode is abnormal.

[0057] When the indoor environment temperature is lower than the cooling start temperature, the indoor coil temperature is detected, the compressor is controlled to run at a low frequency to make the indoor coil temperature lower than the set temperature, and when the indoor coil temperature changes in a certain time period meet the set standard and the indoor coil temperature is lower than the set temperature at the end of the certain time, it is judged that the cooling mode is normal, otherwise it is judged that the cooling mode is abnormal.

[0058] Preferably, in the cooling mode self-checking method, the outdoor fan is controlled to be at medium speed (700 rpm); the indoor fan is controlled to be at maximum speed; the wind shield is controlled to be at the middle position; and the opening degree of the electronic expansion valve is controlled to be at maximum opening*2 / 3 or maximum opening*2 / 3±set threshold. To ensure that the air conditioner can normally run during the cooling mode self-checking process.

[0059] The embodiment carries out self-check of the refrigeration mode according to different control methods when the indoor environment temperature is higher than the refrigeration start temperature and when the indoor environment temperature is lower than the refrigeration start temperature. When the indoor environment temperature is higher than the refrigeration start temperature, the normal refrigeration mode is run for detection. When the indoor environment temperature is lower than the refrigeration start temperature, the compressor is controlled to run in the middle-low frequency band, and the inner coil temperature is controlled to be lower than the set temperature, so as to ensure the normal operation of the air conditioner and avoid the situation that the detection cannot be carried out. Most importantly, the control method of the embodiment will not cause the air conditioner to stop or be damaged.

[0060] Preferably, the middle-low frequency band is 30-50 Hz.

[0061] The refrigeration start temperature is taken as 16℃ as an example for specific description:

[0062] The refrigeration mode self-check starts:

[0063] The indoor environment temperature is detected.

[0064] When the indoor environment temperature is higher than the refrigeration start temperature, the refrigeration mode is run according to the refrigeration set temperature. Preferably, the refrigeration set temperature is the refrigeration start temperature.

[0065] Specifically, when the indoor environment temperature is higher than 16℃, the refrigeration mode is normally run according to the following set parameters: the refrigeration set temperature is automatically set as the refrigeration start temperature 16℃, the indoor fan speed is the maximum, and the baffle is in the middle position. The settings of the rest components can be set according to the refrigeration mode, for example, the opening degree of the electronic expansion valve is the maximum opening degree*2 / 3 or the maximum opening degree*2 / 3±set threshold, the outdoor fan is controlled to be in the middle speed (700 rpm), and the running frequency of the compressor is controlled according to the refrigeration set temperature 16℃ and the indoor environment temperature.

[0066] The indoor coil temperature is detected. When the indoor coil temperature changes in a specific time period and meets the set standard, it is judged that the refrigeration mode is normal, otherwise it is judged that the refrigeration mode is abnormal.

[0067] Specifically, the coil temperature at the start and after a period of time (10 minutes) is detected, for example, the indoor coil dehumidification temperature Ta0 at the start and the temperature Ta1 after 10 minutes, Ta0-Ta1≥5℃, and it is judged that the refrigeration mode is normal, otherwise it is judged that the refrigeration mode is abnormal.

[0068] When the indoor environment temperature is lower than the refrigeration start temperature, the indoor coil temperature is detected, and the compressor is controlled to run in the middle-low frequency band so that the indoor coil temperature is lower than the set temperature.

[0069] Specifically, when the indoor ambient temperature is below 16℃, the existing technology cannot enter the cooling mode. In the cooling self-test mode of this embodiment, the compressor is forced to run in the low-to-medium frequency range of 30Hz-50Hz, so that the indoor coil temperature is 10℃ lower than the set temperature.

[0070] Controlling other components can be done as follows: the indoor fan speed is at its maximum, the baffle is in the middle position, the opening of the electronic expansion valve is controlled to be 2 / 3 of the maximum opening or 2 / 3 of the maximum opening ± the set threshold, and the outdoor fan is controlled to be at medium speed (700 rpm).

[0071] The cooling mode is considered normal if the indoor coil temperature changes within a specific time period meet the set standard and the indoor coil temperature is lower than the set temperature at the end of the specific time period; otherwise, the cooling mode is considered abnormal.

[0072] Specifically, the indoor unit coil temperature is Tb1 after 1 minute of operation and Tb2 after 10 minutes of operation. If Tb1-Tb2≥5℃ and Tb2<10℃, the cooling mode is considered normal; otherwise, the cooling mode is considered abnormal.

[0073] The control and setting standards for components such as compressors, indoor fans, outdoor fans, and electronic expansion valves are determined in advance based on experiments and are not limited to the specific examples mentioned above.

[0074] like Figure 1 The diagram shows the self-test method for cooling mode in this embodiment, which includes the following steps:

[0075] S1, Cooling mode self-test begins.

[0076] S2. Detect the indoor ambient temperature.

[0077] S3. Determine if the indoor ambient temperature is higher than the cooling start-up temperature. If so, proceed to step S4; otherwise, proceed to step S9.

[0078] S4. Run the cooling mode according to the set cooling temperature.

[0079] The preferred setting temperature for cooling is the cooling start-up temperature. Preferably, the outdoor fan is controlled at medium speed (700 rpm); the indoor fan is controlled at maximum speed; the baffle is controlled at the middle position; and the opening of the electronic expansion valve is controlled to be either the maximum opening * 2 / 3 or the maximum opening * 2 / 3 ± the set threshold.

[0080] S5. Detect the indoor coil temperature.

[0081] S6. Determine if the indoor coil temperature change within a specific time period meets the set standard. If yes, proceed to step S7; otherwise, proceed to step S8.

[0082] S7, the refrigeration mode self-check is normal.

[0083] S8, the refrigeration mode self-check is abnormal. Output fault code.

[0084] S9, detect the indoor coil temperature.

[0085] S10, control the compressor to run in the middle-low frequency band so that the indoor coil temperature is lower than the set temperature.

[0086] Preferably, the outdoor fan is controlled to be in the middle speed (700 rpm); the indoor fan is controlled to be in the maximum speed; the wind shield is controlled to be in the middle position; and the opening degree of the electronic expansion valve is controlled to be the maximum opening degree*2 / 3 or the maximum opening degree*2 / 3±set threshold.

[0087] S11, judge whether the indoor coil temperature change in a specific time period meets the set standard and the indoor coil temperature is lower than the set temperature at the end of the specific time. If yes, go to step S7; otherwise, go to step S8.

[0088] The heating mode self-check method is described as follows:

[0089] Detect the indoor environment temperature.

[0090] Specifically, the indoor environment temperature is detected by the existing indoor environment temperature sensor of the air conditioner, and different heating mode self-check methods are determined according to the indoor environment temperature.

[0091] When the indoor environment temperature is lower than the heating start-up temperature, the heating mode is normally run according to the heating set temperature, the indoor coil temperature is detected, and when the indoor coil temperature reaches the first set temperature after a specific time, it is judged that the heating mode is normal, otherwise it is judged that the heating mode is abnormal.

[0092] When the indoor environment temperature is higher than the heating start-up temperature, the compressor is controlled to run in the middle-low frequency band, the indoor coil temperature is detected, and when the indoor coil temperature reaches the second set temperature after a specific time, it is judged that the heating mode is normal, otherwise it is judged that the heating mode is abnormal.

[0093] Preferably, in the heating mode self-check method, the indoor fan speed is controlled to be the maximum speed; the outdoor fan speed is controlled to be the middle-high speed (900 rpm-1200 rpm); the wind shield is controlled to be in the middle position; and the opening degree of the electronic expansion valve is controlled to be the maximum opening degree / 2 or the maximum opening degree / 2±set threshold. To ensure that the air conditioner can normally run in the heating mode self-check process.

[0094] The embodiment carries out self-check of the heating mode according to different control methods when the indoor environment temperature is higher than the heating start-up temperature and when the indoor environment temperature is lower than the heating start-up temperature, carries out normal heating mode operation detection when the indoor environment temperature is lower than the heating start-up temperature, controls the compressor to operate in the middle-low frequency band when the indoor environment temperature is higher than the heating start-up temperature, so as to ensure the normal operation of the air conditioner and avoid the situation that the air conditioner cannot be detected. Most importantly, the control method of the embodiment will not cause the air conditioner to stop or be damaged.

[0095] Preferably, the middle-low frequency band is 30-50 Hz.

[0096] The following takes the heating start-up temperature of 30°C as an example for specific description:

[0097] Start of the heating mode self-check:

[0098] Detect the indoor environment temperature.

[0099] When the indoor environment temperature is lower than the heating start-up temperature, operate the heating mode according to the heating set temperature, and preferably, the heating set temperature is the heating start-up temperature.

[0100] Specifically, when the indoor environment temperature is lower than the heating start-up temperature of 30°C, normally operate the heating mode according to the following set parameters: automatically set the heating set temperature to the heating start-up temperature of 30°C, set the indoor fan speed to the maximum, and set the air baffle to the middle position. The settings of the remaining components can be set according to the heating mode, for example, set the opening degree of the electronic expansion valve to the maximum opening degree / 2 or the maximum opening degree / 2± set threshold, set the outdoor fan to the middle speed (700 rpm), and control the operating frequency of the compressor according to the heating set temperature of 30°C and the indoor environment temperature.

[0101] Detect the indoor coil temperature, and when the indoor coil temperature reaches the first set temperature after a specific time, determine that the heating mode is normal, otherwise, determine that the heating mode is abnormal.

[0102] Specifically, detect whether the coil temperature reaches the first set temperature of 45°C after a start-up period (10 minutes), if yes, determine that the heating mode is normal, otherwise, determine that the heating mode is abnormal.

[0103] When the indoor environment temperature is higher than the heating start-up temperature, control the compressor to operate in the middle-low frequency band, detect the indoor coil temperature, and when the indoor coil temperature reaches the second set temperature after a specific time, determine that the heating mode is normal, otherwise, determine that the heating mode is abnormal.

[0104] Specifically, when the indoor environment temperature is higher than the heating start-up temperature by 30℃, the prior art cannot enter the heating mode. In the heating self-checking mode of the embodiment, the compressor is forced to run at a middle-low frequency of 30-50 Hz, and whether the coil temperature reaches a second set temperature of 40℃ after a start-up period (10 minutes) is detected. If the coil temperature reaches 40℃, it is determined that the heating mode is normal, otherwise, it is determined that the heating mode is abnormal.

[0105] The second set temperature is less than the first set temperature.

[0106] The control of other components can be: the indoor fan speed is maximum, the wind shield is in the middle position, the opening of the electronic expansion valve is controlled to be maximum opening / 2 or maximum opening / 2±set threshold, and the outdoor fan is controlled to be at a middle-high speed (700 rpm-900 rpm).

[0107] The control of the compressor, the indoor fan, the outdoor fan, the electronic expansion valve and the like is determined according to experiments in advance and is not limited to the specific examples.

[0108] As shown in Figure 2 the heating mode self-checking method of the embodiment includes the following steps:

[0109] S1, the heating mode self-checking starts.

[0110] S2, the indoor environment temperature is detected.

[0111] S3, it is determined whether the indoor environment temperature is lower than the heating start-up temperature. If yes, step S4 is entered, otherwise, step S9 is entered.

[0112] S4, the heating mode is run according to the heating set temperature.

[0113] The heating set temperature is preferably the heating start-up temperature. Preferably, the outdoor fan is controlled to be at a middle-high speed (900 rpm-1200 rpm), the indoor fan is controlled to be at a maximum speed, the wind shield is controlled to be in a middle position, and the opening of the electronic expansion valve is controlled to be maximum opening / 2 or maximum opening / 2±set threshold.

[0114] S5, the indoor coil temperature is detected.

[0115] S6, it is determined whether the indoor coil temperature reaches a first set temperature after a specific time. If yes, step S7 is entered, otherwise, step S8 is entered.

[0116] S7, the heating mode self-checking is normal.

[0117] S8, the heating mode self-checking is abnormal. A fault code is output.

[0118] S9, control the compressor to run in a low-middle frequency band.

[0119] Preferably, the outdoor fan speed is controlled to be a middle-high speed (900 rpm-1200 rpm); the indoor fan is controlled to be at a maximum speed; the damper is controlled to be at a middle position; and the electronic expansion valve is controlled to be at a maximum opening degree / 2 or a maximum opening degree / 2±a set threshold.

[0120] S10, detect the indoor coil temperature.

[0121] S11, determine whether the indoor coil temperature after a specific time reaches a second set temperature, if yes, go to step S7, otherwise, go to step S8.

[0122] The self-checking method of the air conditioner of the embodiment further includes an indoor fan self-checking method:

[0123] The indoor fan is controlled to run according to a set gear. The set gear means that all the running gears of the indoor fan are tested.

[0124] The speed of the indoor fan is detected, and when the detected speed of the indoor fan is consistent with the set gear, the indoor fan is determined to be normal, otherwise, the indoor fan is determined to be abnormal.

[0125] As shown in the table, taking an indoor fan including a low wind gear, a middle wind gear and a high wind gear as an example: Figure 3

[0126] S1, the indoor fan self-checking starts, and goes to steps S2, S5 and S8 in sequence.

[0127] S2, the indoor fan is controlled to run according to a low wind gear.

[0128] S3, the speed of the indoor fan is detected.

[0129] S4, it is determined whether the detected speed of the indoor fan is consistent with the low wind gear, if yes, the indoor fan is normal, otherwise, the indoor fan is abnormal, and a fault code is output.

[0130] S5, the indoor fan is controlled to run according to a middle wind gear.

[0131] S6, the speed of the indoor fan is detected.

[0132] S7, it is determined whether the detected speed of the indoor fan is consistent with the middle wind gear, if yes, the indoor fan is normal, otherwise, the indoor fan is abnormal, and a fault code is output.

[0133] S8, the indoor fan is controlled to run according to a high wind gear.

[0134] S9, the speed of the indoor fan is detected.

[0135] ​S10, judging whether the detected indoor fan rotating speed conforms to high wind position, if yes, the indoor fan is normal, otherwise, the indoor fan is abnormal, and outputting a fault code.

[0136] The self-checking method of the air conditioner of the embodiment further comprises an outdoor fan self-checking method.

[0137] The rotating speed of the outdoor fan is controlled to gradually increase according to a set increasing speed.

[0138] The rotating speed of the outdoor fan is detected, and the outdoor fan is judged to be normal when the increasing speed of the detected outdoor fan rotating speed is within a set increasing speed threshold range, otherwise, the outdoor fan is judged to be abnormal.

[0139] As shown in Figure 4 the outdoor fan self-checking method is:

[0140] S1, the outdoor fan self-checking starts.

[0141] S2, the rotating speed of the outdoor fan is controlled to increase from 20% of the maximum rotating speed to 80% of the maximum rotating speed according to a set increasing speed.

[0142] S3, the rotating speed of the outdoor fan is detected.

[0143] S4, judging whether the increasing speed of the detected outdoor fan rotating speed is within a set increasing speed threshold range, if yes, entering step S5, otherwise, entering step S6.

[0144] S5, the outdoor fan is normal.

[0145] S6, the outdoor fan is abnormal, and outputting a fault code.

[0146] The self-checking method of the air conditioner of the embodiment further comprises an electronic expansion valve self-checking method.

[0147] The opening degree of the electronic expansion valve is controlled, and the operating frequency of the compressor is controlled.

[0148] The exhaust temperature of the compressor is detected, and whether the electronic expansion valve is normal is judged according to the exhaust temperature.

[0149] The electronic expansion valve self-checking method is that the electronic expansion valve is judged to be normal when the following conditions are met, otherwise, the electronic expansion valve is judged to be abnormal:

[0150] The exhaust temperature increases when the operating frequency of the compressor is unchanged and the opening degree of the electronic expansion valve is controlled to be a first opening degree; the exhaust temperature decreases when the opening degree of the electronic expansion valve is controlled to increase from the first opening degree to a second opening degree; and the exhaust temperature increases when the electronic expansion valve is controlled to decrease from the second opening degree to the first opening degree.

[0151] The first opening degree is 1 / 3 of the maximum opening degree, and the second opening degree is the maximum opening degree.

[0152] In the electronic expansion valve detection, the indoor fan and the outdoor fan are both operated at low speed.

[0153] As shown in Figure 5 , the electronic expansion valve self-checking method is:

[0154] S1, the electronic expansion valve self-checking starts.

[0155] S2, the operating frequency of the compressor is controlled to be fixed, and the indoor fan and the outdoor fan are both operated at low speed.

[0156] S3, the exhaust temperature of the compressor is detected.

[0157] S4, the opening degree of the electronic expansion valve is controlled to increase to a first opening degree.

[0158] S5, whether the exhaust temperature of the compressor increases, if yes, step S6 is entered, otherwise, step S11 is entered.

[0159] S6, the electronic expansion valve is controlled to increase from the first opening degree to a second opening degree.

[0160] S7, whether the exhaust temperature of the compressor decreases, if yes, step S8 is entered, otherwise, step S11 is entered.

[0161] S8, the opening degree of the electronic expansion valve is controlled to decrease from the second opening degree to the first opening degree.

[0162] S9, whether the exhaust temperature of the compressor increases, if yes, step S10 is entered, otherwise, step S11 is entered.

[0163] S10, the electronic expansion valve is normal.

[0164] S11, the electronic expansion valve is abnormal, and a fault code is output.

[0165] The air conditioner self-checking method of the embodiment further includes an indoor electric heating module self-checking method:

[0166] The indoor electric heating module is controlled to be powered on, and the indoor fan is controlled to rotate;

[0167] The indoor coil temperature is detected, and when the indoor coil temperature increases, it is judged that the indoor electric heating module is normal, otherwise, it is judged that the electric heating module is abnormal.

[0168] As shown in Figure 6 , the indoor electric heating module self-checking method is:

[0169] S1, the indoor electric heating module self-checking starts.

[0170] S2, the indoor electric heating module is controlled to be powered on, and the indoor fan is controlled to rotate.

[0171] S3, the indoor coil temperature is detected.

[0172] S4, judge whether the indoor coil temperature is raised. If yes, go to step S5, otherwise go to step S6.

[0173] S5, the indoor electric heating module is normal.

[0174] S6, the indoor electric heating module is abnormal, output a fault code.

[0175] Preferably, the self-checking sequence of the air conditioner self-checking method of the embodiment is firstly component self-checking, secondly refrigeration mode self-checking and heating mode self-checking. The component self-checking includes indoor fan self-checking, outdoor fan self-checking, electronic expansion valve self-checking and indoor electric heating module self-checking. The indoor electric heating module self-checking is performed after the indoor fan self-checking is normal. The electronic expansion valve self-checking is performed after the indoor fan and outdoor fan self-checking are normal.

[0176] As shown in Figure 7 the air conditioner self-checking method includes the following steps:

[0177] S1, start the self-checking mode.

[0178] S2, judge whether the indoor fan self-checking is normal. If yes, go to step S3, otherwise go to step S9.

[0179] S3, judge whether the indoor electric heating module self-checking is normal. If yes, go to step S4, otherwise go to step S9.

[0180] S4, judge whether the outdoor fan self-checking is normal. If yes, go to step S5, otherwise go to step S9.

[0181] S5, judge whether the electronic expansion valve self-checking is normal. If yes, go to step S6, otherwise go to step S9.

[0182] S6, judge whether the refrigeration mode self-checking is normal. If yes, go to step S7, otherwise go to step S9.

[0183] S7, judge whether the heating mode self-checking is normal. If yes, go to step S8, otherwise go to step S9.

[0184] S8, the self-checking is passed.

[0185] S9, output a fault code.

[0186] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified by those skilled in the art, or some technical features can be replaced by equivalent features; and the modification or replacement does not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions claimed by the present application.

Claims

1. An air conditioner self-checking method, characterized by, The method comprises: The refrigeration mode self-checking method comprises: Detecting the indoor environment temperature; When the indoor environment temperature is higher than the refrigeration start-up temperature, running the refrigeration mode according to the refrigeration set temperature, detecting the indoor coil temperature, and judging the refrigeration mode normal when the indoor coil temperature changes in accordance with the set standard within a specific time period, otherwise judging the refrigeration mode abnormal; When the indoor environment temperature is lower than the refrigeration start-up temperature, detecting the indoor coil temperature, and controlling the compressor to run in the middle-low frequency band so that the indoor coil temperature is lower than the set temperature, judging the refrigeration mode normal when the indoor coil temperature changes in accordance with the set standard within a specific time period and the indoor coil temperature is lower than the set temperature at the end of the specific time, otherwise judging the refrigeration mode abnormal; The heating mode self-checking method comprises: Detecting the indoor environment temperature; When the indoor environment temperature is lower than the heating start-up temperature, running the heating mode according to the heating set temperature, detecting the indoor coil temperature, and judging the heating mode normal when the indoor coil temperature reaches the first set temperature after a specific time, otherwise judging the heating mode abnormal; When the indoor environment temperature is higher than the heating start-up temperature, controlling the compressor to run in the middle-low frequency band, detecting the indoor coil temperature, and judging the heating mode normal when the indoor coil temperature reaches the second set temperature after a specific time, otherwise judging the heating mode abnormal.

2. The air conditioner self-checking method of claim 1, wherein, In the refrigeration mode self-checking method and the heating mode self-checking method, the indoor fan speed is controlled to be the maximum speed, and the outdoor fan speed is controlled to be the middle-high speed.

3. The air conditioner self-checking method of claim 1, wherein, In the refrigeration mode self-checking method, the opening degree of the electronic expansion valve is controlled to be the maximum opening degree*2 / 3 or the maximum opening degree*2 / 3±set threshold.

4. The air conditioner self-checking method of claim 1, wherein, In the heating mode self-checking method, the opening degree of the electronic expansion valve is controlled to be the maximum opening degree / 2 or the maximum opening degree / 2±set threshold.

5. The air conditioner self-checking method of claim 1, wherein, The refrigeration set temperature is the refrigeration start-up temperature, the heating set temperature is the heating start-up temperature, and the middle-low frequency band is 30-50 Hz.

6. The method of claim 1-5, wherein, The refrigeration mode self-checking method and the heating mode self-checking method further comprise an indoor fan self-checking method before them: Controlling the indoor fan to run according to the set gear; Detecting the speed of the indoor fan, and judging the indoor fan normal when the detected speed of the indoor fan is in accordance with the set gear, otherwise judging the indoor fan abnormal.

7. The method of claim 1-5, wherein, The refrigeration mode self-checking method and the heating mode self-checking method further comprise an indoor electric heating module self-checking method before them: Controlling the indoor electric heating module to be powered on and the indoor fan to rotate; Detecting the indoor coil temperature, and judging the indoor electric heating module normal when the indoor coil temperature rises, otherwise judging the indoor electric heating module abnormal.

8. The method of claim 1-5, wherein, The refrigeration mode self-checking method and the heating mode self-checking method further comprise an outdoor fan self-checking method before them: Controlling the speed of the outdoor fan to gradually increase according to the set speed increase; Detecting the speed of the outdoor fan, and judging the outdoor fan normal when the detected speed increase of the outdoor fan is within the set speed increase threshold, otherwise judging the outdoor fan abnormal.

9. The method of claim 1-5, wherein, The refrigeration mode self-checking method and the heating mode self-checking method further comprise an electronic expansion valve self-checking method before them: Controlling the opening degree of the electronic expansion valve and the running frequency of the compressor; Detecting an exhaust temperature of the compressor, and determining whether the electronic expansion valve is normal according to the exhaust temperature.

10. The air conditioner self-checking method of claim 9, wherein, The self-checking method of the electronic expansion valve is that when the following conditions are met, it is determined that the electronic expansion valve is normal, otherwise it is determined that the electronic expansion valve is abnormal: Controlling the operating frequency of the compressor to be unchanged, controlling the exhaust temperature to rise when the opening degree of the electronic expansion valve is controlled to be the first opening degree; controlling the exhaust temperature to drop when the opening degree of the electronic expansion valve is controlled to increase from the first opening degree to the second opening degree; and controlling the exhaust temperature to rise when the electronic expansion valve is controlled to decrease from the second opening degree to the first opening degree.

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