Control method, device, electronic device and storage medium for variable frequency air conditioner outdoor unit

Abstract

The present invention relates to a control method, device, electronic device, and storage medium for a variable-frequency air conditioner outdoor unit. The outdoor unit includes first, second, and third temperature sensors; the method includes: S1, determining the status of the first, second, and third temperature sensors; S2, executing S3 when only the first temperature sensor is abnormal and the second monitoring result is normal; S3, controlling the compressor to reduce frequency by a first preset step, and executing S4 when the third monitoring result is normal; S4, executing S6 when the AC input side power of the variable-frequency air conditioner is normal, otherwise controlling the compressor to reduce frequency by a second preset step until the AC input side power is normal; S6, controlling the compressor to operate at the current frequency when the compressor current value is normal, otherwise controlling the compressor to continue reducing frequency by the first preset step until the compressor current value is normal. Implementing the present invention can ensure that the variable-frequency air conditioner can still operate effectively even if the sensor is damaged, thereby improving the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning control, and more specifically, to a method, device, electronic device and storage medium for controlling an outdoor unit of a variable frequency air conditioner. Background Art

[0002] In many scenarios, when a temperature sensor malfunctions during use in an inverter air conditioner, the unit will report a sensor temperature protection error. This sensor temperature protection error typically requires the air conditioner to be shut down to protect it from malfunctioning. However, a sudden shutdown during use can negatively impact the user experience. Furthermore, sudden changes in indoor temperature, such as increases, caused by the shutdown can further degrade the user experience and significantly reduce product acceptance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method, device, electronic device and storage medium for controlling an outdoor unit of a variable frequency air conditioner.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a control method for an outdoor unit of a variable frequency air conditioner, wherein the outdoor unit includes a first temperature sensor for obtaining an ambient temperature, a second temperature sensor for obtaining an outdoor condenser temperature, and a third temperature sensor for obtaining a compressor exhaust temperature; the control method includes the following steps:

[0005] S1. Determine states of the first temperature sensor, the second temperature sensor, and the third temperature sensor according to a first monitoring result corresponding to the first temperature sensor, a second monitoring result corresponding to the second temperature sensor, and a third monitoring result corresponding to the third temperature sensor;

[0006] S2. When only the first temperature sensor is abnormal, determine whether the second monitoring result is normal. If so, execute step S3; otherwise, shut down the variable frequency air conditioner.

[0007] S3, controlling the compressor to reduce frequency by a first preset step, and determining whether the third monitoring result is normal, if so, executing step S4, otherwise shutting down the variable frequency air conditioner;

[0008] S4, determining whether the AC input power of the variable frequency air conditioner is normal, if so, executing step S6, otherwise executing step S5;

[0009] S5. Controlling the compressor to reduce frequency at a second preset step until the AC input side power is normal, wherein the second preset step is smaller than the first preset step;

[0010] S6, determining whether the current value of the compressor is normal, if so, executing step S8, otherwise executing step S7;

[0011] S7, controlling the compressor to reduce frequency at a third preset step until the current value of the compressor is normal;

[0012] S8. Control the compressor to operate at the current frequency.

[0013] Preferably, the variable frequency air conditioner outdoor unit control method of the present application further includes:

[0014] S21A, when only the second temperature sensor is abnormal, determining whether the first monitoring result is normal; if so, executing step S22A; otherwise, shutting down the variable frequency air conditioner;

[0015] S22A, determining whether the third monitoring result is normal; if so, executing step S23A; otherwise, shutting down the variable frequency air conditioner;

[0016] S23A, controlling the compressor to reduce frequency at the first preset step, and controlling the fan of the outdoor unit to operate at a high speed mode, until the third monitoring result meets a first preset value;

[0017] S24A, controlling the fan to operate in medium speed mode, and determining whether the AC input power of the variable frequency air conditioner is normal; if so, executing step S26A; otherwise, executing step S25A;

[0018] S25A, controlling the compressor to continue frequency reduction at the first preset step, and controlling the outdoor fan to operate at high speed until the AC input side power of the variable frequency air conditioner is normal;

[0019] S26A, determining whether the current value of the compressor is normal, if so, executing step S28A, otherwise executing step S27A;

[0020] S27A, controlling the compressor to continue reducing the frequency at the first preset step, and controlling the fan of the outdoor unit to operate at a high speed until the current value of the compressor is normal;

[0021] S28A: Control the compressor to operate at the current frequency, and control the fan to operate at a medium speed mode.

[0022] Preferably, the variable frequency air conditioner outdoor unit control method of the present application further includes:

[0023] S21B, when only the third temperature sensor is abnormal, determining whether the first monitoring result is normal; if so, executing step S22B; otherwise, shutting down the variable frequency air conditioner;

[0024] S22B, determining whether the second monitoring result is normal; if so, executing step S23B; otherwise, shutting down the variable frequency air conditioner;

[0025] S23B, controlling the compressor to reduce frequency at the first preset step, and controlling the fan of the outdoor unit to operate at a high speed mode until the second monitoring result meets a second preset value;

[0026] S24B, controlling the fan to operate in medium speed mode, and determining whether the AC input power of the variable frequency air conditioner is normal; if so, executing step S26B; otherwise, executing step S25B;

[0027] S25B, controlling the compressor to continue reducing the frequency at the first preset step to a preset limit value, and controlling the fan of the outdoor unit to operate at a high speed mode until the AC input side power of the variable frequency air conditioner is normal;

[0028] S26B, determining whether the current value of the compressor is normal, if so, executing step S28B, otherwise executing step S27B;

[0029] S27B, controlling the compressor to continue reducing the frequency at the first preset step, and controlling the fan of the outdoor unit to operate at a high speed mode until the current value of the compressor is normal;

[0030] S28B, controlling the compressor to operate at the current frequency, and controlling the fan to operate at a medium speed mode.

[0031] Preferably, the variable frequency air conditioner outdoor unit control method of the present application further includes:

[0032] S21C, when at least two of the first temperature sensor, the second temperature sensor, and the third temperature sensor are abnormal, determining whether the DC bus voltage of the variable frequency air conditioner is normal; if so, executing step S22C; otherwise, controlling the compressor to operate at a preset compression frequency;

[0033] S22C, controlling the outdoor unit's fan to operate in high-speed mode, and monitoring whether the temperature rise state of the IPM device in the air conditioner is normal. If so, executing step S23C; otherwise, shutting down the variable frequency air conditioner;

[0034] S23C, controlling the compressor to reduce frequency by the first preset step, and determining whether the AC input power of the variable frequency air conditioner is normal; if so, executing step S24C; otherwise, shutting down the variable frequency air conditioner;

[0035] S24C, determining whether the current value of the compressor is normal; if so, executing step S25C; otherwise, shutting down the variable frequency air conditioner;

[0036] S25C, determining whether the operating frequency of the compressor is less than a preset upper limit; if so, executing step S26C; otherwise, shutting down the variable frequency air conditioner;

[0037] S26C, determining whether the compressor operating frequency is a preset minimum value; if so, executing step S28C; otherwise, executing step S27C;

[0038] S27C, controlling the compressor to reduce the frequency to the preset minimum value at the first preset step, and executing step S28C;

[0039] S28C, controlling the compressor to operate at the current frequency.

[0040] Preferably, in the variable frequency air conditioner outdoor unit control method of the present application, the determining whether the first monitoring result is normal includes:

[0041] The normal threshold value of the first monitoring result is derated to obtain a first derated threshold value, and when the first monitoring result is greater than the first derated threshold value, it is determined that the first monitoring result is abnormal.

[0042] Preferably, in the variable frequency air conditioner outdoor unit control method of the present application, the determining whether the second monitoring result is normal includes:

[0043] The normal threshold value of the second monitoring result is derated to obtain a second derated threshold value, and when the second monitoring result is greater than the second derated threshold value, it is determined that the second monitoring result is abnormal.

[0044] Preferably, in the variable frequency air conditioner outdoor unit control method of the present application, the determining whether the third monitoring result is normal includes:

[0045] The normal threshold value of the third monitoring result is derated to obtain a third derated threshold value, and when the third monitoring result is greater than the third derated threshold value, it is determined that the third monitoring result is abnormal.

[0046] Preferably, in the variable frequency air conditioner outdoor unit control method of the present application, the determining whether the AC input side power of the variable frequency air conditioner is normal includes:

[0047] The normal threshold value of the AC input side power is derated to obtain a fourth derated threshold value, and when the AC input side power is greater than the fourth derated threshold value, it is determined that the AC input side power of the variable frequency air conditioner is abnormal.

[0048] Preferably, in the variable frequency air conditioner outdoor unit control method of the present application, the third preset step is the same as the first preset step.

[0049] The present application also provides a control device for an outdoor unit of a variable frequency air conditioner, wherein the outdoor unit includes a first temperature sensor for obtaining an ambient temperature, a second temperature sensor for obtaining an outdoor condenser temperature, and a third temperature sensor for obtaining a compressor exhaust temperature; the control device includes:

[0050] a sensor monitoring unit, configured to determine states of the first temperature sensor, the second temperature sensor, and the third temperature sensor according to a first monitoring result corresponding to the first temperature sensor, a second monitoring result corresponding to the second temperature sensor, and a third monitoring result corresponding to the third temperature sensor;

[0051] a first determining unit, configured to determine whether the second monitoring result is normal when only the first temperature sensor is abnormal, and output a positive result if so, otherwise shutting down the variable frequency air conditioner;

[0052] a second determining unit, configured to control the compressor to reduce frequency by a first preset step, and determine whether the third monitoring result is normal, and if so, output a positive result; otherwise, shut down the variable frequency air conditioner;

[0053] a third judging unit, configured to judge whether the AC input side power of the variable frequency air conditioner is normal, and if so, output a positive result, otherwise output a negative result;

[0054] a fourth judgment unit, configured to judge whether the current value of the compressor is normal, and output a positive result if so, or a negative result if otherwise;

[0055] a first execution unit, configured to control the compressor to reduce frequency at a second preset step until the AC input side power is normal;

[0056] a second execution unit, configured to control the compressor to reduce frequency at a third preset step until the current value of the compressor is normal;

[0057] The third execution unit is configured to control the compressor to operate at a current frequency.

[0058] The present application also constructs a computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and the computer program is suitable for loading by a processor to execute the steps of the variable frequency air conditioner outdoor unit control method as described in any one of the above items.

[0059] The present application also constructs a computer, characterized in that it includes a memory and a processor, wherein a computer program is stored in the memory, and the processor executes the steps of the variable frequency air conditioner outdoor unit control method as described in any one of the above items by calling the computer program stored in the memory.

[0060] The implementation of the variable frequency air conditioner outdoor unit control method, device, electronic device and storage medium of the present invention has the following beneficial effects: it can ensure that the variable frequency air conditioner can still operate effectively even when the sensor is damaged, effectively reduce the probability of sudden shutdown of the air conditioner, and improve user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0062] Figure 1 This is a flow chart of an embodiment of a method for controlling an outdoor unit of a variable frequency air conditioner provided by an embodiment of the present invention;

[0063] Figure 2 This is a flow chart of another embodiment of the method for controlling an outdoor unit of a variable frequency air conditioner provided by an embodiment of the present invention;

[0064] Figure 3 This is a flow chart of another embodiment of a method for controlling an outdoor unit of a variable frequency air conditioner provided by an embodiment of the present invention;

[0065] Figure 4 is a flow chart of another embodiment of the variable frequency air conditioner outdoor unit control method provided by an embodiment of the present invention;

[0066] Figure 5 This is a logic block diagram of an embodiment of a variable frequency air conditioner outdoor unit control device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0067] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0068] like Figure 1As shown, in a first embodiment of a control method for a variable-frequency air conditioner outdoor unit of the present invention, the outdoor unit includes a first temperature sensor for obtaining ambient temperature, a second temperature sensor for obtaining outdoor condenser temperature, and a third temperature sensor for obtaining compressor exhaust temperature. The control method includes determining the status of the first, second, and third temperature sensors based on a first monitoring result corresponding to the first temperature sensor, a second monitoring result corresponding to the second temperature sensor, and a third monitoring result corresponding to the third temperature sensor. Specifically, corresponding temperature monitoring results are obtained from temperature sensors located at corresponding positions in the outdoor unit, and the status of the corresponding temperature sensors is determined based on the monitoring results. For example, if the first monitoring result is normal, the status of the first temperature sensor is determined to be normal; if the first monitoring result is abnormal, the status of the first temperature sensor is determined to be abnormal. If the second monitoring result is normal, the status of the second temperature sensor is determined to be normal; if the first monitoring result is abnormal, the status of the second temperature sensor is determined to be normal. If the third monitoring result is normal, the status of the third temperature sensor is determined to be normal; if the third monitoring result is abnormal, the status of the third temperature sensor is determined to be abnormal. The criteria for determining whether the status is normal or abnormal can be pre-set. For example, if the monitoring result is outside the set normal range, such as a maximum value or a minimum value, the monitoring result is determined to be abnormal.

[0069] S2. When only the first temperature sensor is abnormal, determine whether the second monitoring result is normal. If so, execute step S3; otherwise, shut down the variable-frequency air conditioner. Specifically, when it is determined based on the monitoring results that only the first temperature sensor is abnormal, the second monitoring result is determined to be normal based on a preset judgment standard. This judgment standard can be set according to different application scenarios. In one specific embodiment, determine whether the second monitoring result exceeds a preset temperature value. Only when the second monitoring result does not exceed the preset temperature value is the second monitoring result determined to be normal, at which point the subsequent steps can be executed. If the second monitoring result exceeds the preset temperature value, it is determined that the second monitoring result is abnormal, and the variable-frequency air conditioner needs to be directly shut down.

[0070] S3, control the compressor to reduce the frequency at a first preset step, and determine whether the third monitoring result is normal. If so, execute step S4, otherwise turn off the variable frequency air conditioner. Specifically, when the second monitoring result is normal, control the compressor to start reducing the frequency according to the first preset step. The third monitoring result is judged during the frequency reduction process. That is, it can be judged whether the third monitoring result is normal according to a preset judgment standard, and the judgment standard can be set according to different application scenarios. In a specific embodiment, it is determined whether the third monitoring result exceeds a preset temperature value. Only when the third monitoring result does not exceed the preset temperature value can the third monitoring result be determined to be normal, and the subsequent steps can be executed at this time; when the third monitoring result exceeds the preset temperature value, that is, the third monitoring result is determined to be abnormal, and the variable frequency air conditioner needs to be directly shut down.

[0071] S4: Determine whether the AC input power of the variable-frequency air conditioner is normal. If so, proceed to step S6; otherwise, proceed to step S5. S5: Control the compressor to reduce frequency by a second preset step until the AC input power is normal, where the second preset step is smaller than the first preset step. S6: Determine whether the compressor current is normal. If so, proceed to step S8; otherwise, proceed to step S7. S7: Control the compressor to reduce frequency by a third preset step until the compressor current is normal. S8: Control the compressor to operate at the current frequency. Specifically, when the third monitoring result is normal, the AC input power of the variable-frequency air conditioner is determined. Specifically, whether the AC input power is normal can be determined based on a preset judgment standard, which can be set according to different application scenarios. In one embodiment, this power determination can also be converted to a determination of the AC input current, that is, determining whether the AC input current is within a preset limit value range. When the AC input power is normal, the compressor current value is determined. When the power on the AC input side is abnormal, the compressor is directly controlled to reduce the frequency with a larger step, namely the second preset step, and whether the AC side input power is normal is judged during the frequency reduction process. When the AC side input power is normal, the current value of the compressor is judged. When the current value of the compressor is normal, the compressor can be controlled to operate at the current frequency, that is, enter a fault-tolerant operating state. When the current value of the compressor is abnormal, the compressor is controlled to continue to reduce the frequency with a third preset step until the compressor current is normal. Among them, the current judgment standard of the compressor can be set according to different scenarios. In one embodiment, the third preset step can be the same as the first preset step.

[0072] Optionally, the first preset step is 1Hz per second, and the second preset step is 1Hz every 30 seconds. This means that when the air conditioner's operating frequency is low, rapid frequency reduction can be used without causing the motor to lose steps. Furthermore, when the exhaust temperature approaches or reaches the limit, slow frequency reduction can be used. Excessively high exhaust temperatures may be caused by low refrigerant or high system pressure, so a slow frequency reduction transition can help stabilize the product during operation.

[0073] like Figure 2 As shown, in one embodiment, the control method of the variable frequency air conditioner outdoor unit of the present application also includes: S21A, when only the second temperature sensor is abnormal, judging whether the first monitoring result is normal, if so, executing step S22A, otherwise shutting down the variable frequency air conditioner. Specifically, when it is determined according to the monitoring result that only the second temperature sensor is abnormal, the first monitoring result is judged, that is, whether the first monitoring result is normal is judged according to the preset judgment standard. The judgment standard can be set according to different application scenarios. In a specific embodiment, it is determined whether the first monitoring result exceeds a preset temperature value. Only when the first monitoring result does not exceed the preset temperature value can the first monitoring result be determined to be normal, and the subsequent steps can be executed at this time; when the first monitoring result exceeds the preset temperature value, that is, the first monitoring result is determined to be abnormal, and the variable frequency air conditioner needs to be directly shut down.

[0074] S22A: Determine whether the third monitoring result is normal. If so, proceed to step S23A; otherwise, shut down the variable-frequency air conditioner. Specifically, if the first monitoring result is normal, the third monitoring result is determined to be normal based on a preset judgment standard, which can be set according to different application scenarios. In one embodiment, the third monitoring result is determined to be normal only if it does not exceed the preset temperature value, at which point the subsequent steps can be executed. If the third monitoring result exceeds the preset temperature value, the third monitoring result is determined to be abnormal, and the variable-frequency air conditioner must be shut down directly.

[0075] S23A: Control the compressor to reduce frequency by a first preset step and control the outdoor unit fan to operate at high speed until the third monitoring result satisfies a first preset value. Specifically, when the third monitoring result is normal, control the compressor to begin reducing frequency by the first preset step and control the outdoor unit fan to operate at high speed. The third monitoring result is monitored during the frequency reduction process. When the third monitoring result satisfies a preset temperature, i.e., the first preset value, the subsequent steps are executed.

[0076] S24A: Control the fan to operate at medium speed mode and determine whether the AC input power of the variable frequency air conditioner is normal. If so, execute step S26A; otherwise, execute step S25A. S25A: Control the compressor to continue reducing the frequency by a first preset step and control the outdoor unit fan to operate at high speed mode until the AC input power of the variable frequency air conditioner is normal. S26A: Determine whether the compressor current value is normal. If so, execute step S28A; otherwise, execute step S27A. S27A: Control the compressor to continue reducing the frequency by a first preset step and control the outdoor unit fan to operate at high speed mode until the compressor current value is normal. S28A: Control the compressor to operate at the current frequency and control the fan to operate at medium speed mode. Specifically, when the third monitoring result reaches the corresponding preset value, the fan is controlled to operate at medium speed mode and the AC input power of the variable frequency air conditioner is determined. That is, the AC input power can be determined based on a preset judgment standard, which can be set according to different application scenarios. If the AC input power is normal, the compressor current value is determined. When the power on the AC input side is abnormal, the compressor is directly controlled to continue to reduce the frequency at the first preset step, and the fan is controlled to run at a high wind speed. During the frequency reduction process, it is judged whether the input power on the AC side is normal. When the input power on the AC side is normal, the current value of the compressor is judged. When the current value of the compressor is normal, the compressor can be controlled to operate at the current frequency, that is, enter a fault-tolerant operating state. When the current value of the compressor is abnormal, the compressor is controlled to continue to reduce the frequency at the first preset step, and the fan is controlled to run at a high wind speed until the compressor current is normal. Among them, the current judgment standard of the compressor can be set according to different scenarios.

[0077] like Figure 3 As shown, in one embodiment, the control method of the variable frequency air conditioner outdoor unit of the present application also includes: S21B, when only the third temperature sensor is abnormal, judging whether the first monitoring result is normal, if so, executing step S22B, otherwise shutting down the variable frequency air conditioner. Specifically, when it is determined according to the monitoring result that only the third temperature sensor is abnormal, the first monitoring result is judged, that is, whether the first monitoring result is normal is judged according to the preset judgment standard. The judgment standard can be set according to different application scenarios. In a specific embodiment, it is determined whether the first monitoring result exceeds a preset temperature value. Only if the first monitoring result does not exceed the preset temperature value can the first monitoring result be determined to be normal, and the subsequent steps can be executed at this time; when the first monitoring result exceeds the preset temperature value, that is, the first monitoring result is determined to be abnormal, and the variable frequency air conditioner needs to be directly shut down.

[0078] S22B: Determine whether the second monitoring result is normal. If so, execute step S23B; otherwise, shut down the variable-frequency air conditioner. Specifically, when the first monitoring result is normal, the second monitoring result is determined to be normal based on a preset judgment standard, which can be set according to different application scenarios. In one embodiment, the second monitoring result is determined to exceed a preset temperature value. Only if the second monitoring result does not exceed the preset temperature value is the third monitoring result determined to be normal, at which point the subsequent steps can be executed. If the second monitoring result exceeds the preset temperature value, the second monitoring result is determined to be abnormal, and the variable-frequency air conditioner must be shut down directly.

[0079] S23B: Control the compressor to reduce frequency by a first preset step and control the outdoor unit fan to operate at high speed until the second monitoring result satisfies a second preset value. Specifically, when the second monitoring result is normal, control the compressor to begin reducing frequency by the first preset step and control the outdoor unit fan to operate at high speed. During the frequency reduction process, the second monitoring result is monitored. When the second monitoring result satisfies a preset temperature, i.e., the second preset value, the subsequent steps are executed.

[0080] S24B: Control the fan to operate in medium speed mode and determine whether the AC input power of the variable frequency air conditioner is normal. If so, execute step S26B; otherwise, execute step S25B. S25B: Control the compressor to continue reducing the frequency by a first preset step to a preset limit value, and control the outdoor unit fan to operate in high speed mode until the AC input power of the variable frequency air conditioner is normal. S26B: Determine whether the compressor current value is normal. If so, execute step S28B; otherwise, execute step S27B. S27B: Control the compressor to continue reducing the frequency by a first preset step and control the outdoor unit fan to operate in high speed mode until the compressor current value is normal. S28B: Control the compressor to operate at the current frequency and control the fan to operate in medium speed mode. Specifically, when the second monitoring result reaches the corresponding preset value, the fan is controlled to operate in medium speed mode and the AC input power of the variable frequency air conditioner is determined. That is, whether the AC input power is normal can be determined according to a preset judgment standard. The judgment standard can be set according to different application scenarios. When the power on the AC input side is normal, the current value of the compressor is determined. When the power on the AC input side is abnormal, the compressor is directly controlled to continue reducing the frequency at the first preset step, while the fan is controlled to run at a high wind speed. During the frequency reduction process, it is determined whether the input power on the AC side is normal. When the input power on the AC side is normal, the current value of the compressor is determined. When the current value of the compressor is normal, the compressor can be controlled to operate at the current frequency, that is, to enter a fault-tolerant operating state. When the current value of the compressor is abnormal, the compressor is controlled to continue reducing the frequency at the first preset step, while the fan is controlled to run at a high wind speed until the compressor current is normal. Among them, the current judgment standard of the compressor can be set according to different scenarios.

[0081] like Figure 4 As shown, in one embodiment, the variable frequency air conditioner outdoor unit control method of the present application further includes: S21C, when at least two of the first temperature sensor, the second temperature sensor, and the third temperature sensor are abnormal, determining whether the DC bus voltage of the variable frequency air conditioner is normal; if so, executing step S22C; otherwise, controlling the compressor to operate at a preset compression frequency. Specifically, when any two or three of the first temperature sensor, the second temperature sensor, and the third temperature sensor are abnormal, determining whether the DC bus voltage of the variable frequency air conditioner is normal; if the voltage is normal, executing the subsequent steps; if the voltage is abnormal, directly controlling the compressor to operate at a preset compression frequency, which may be the minimum compression frequency of the air conditioner.

[0082] S22C: Control the outdoor unit's fan to operate at high speed and monitor the temperature rise of the IPM device within the air conditioner to see if it is normal. If so, proceed to step S23C; otherwise, shut down the inverter air conditioner. Specifically, when the DC bus voltage of the inverter air conditioner is normal, the temperature rise of the IPM device within the air conditioner can be monitored to determine whether it is normal. If the temperature rise exceeds a preset value, such as 1 degree Celsius, the temperature rise is determined to be abnormal, and the inverter air conditioner can be directly shut down. Otherwise, the temperature rise is determined to be normal, and the subsequent steps are executed.

[0083] S23C: Control the compressor to reduce frequency at a first preset step and determine whether the AC input power of the inverter air conditioner is normal. If so, execute step S24C; otherwise, shut down the inverter air conditioner. Specifically, when the temperature rise of the air conditioner's IPM device is normal, control the compressor to begin reducing frequency at the first preset step. During the frequency reduction process, determine whether the power on the AC input of the inverter air conditioner is normal. This can be determined by determining whether the power on the AC input exceeds an upper limit. For example, determine whether the power exceeds 150W. If so, determine that the power on the AC input is abnormal and shut down the inverter air conditioner. If not, execute the following steps.

[0084] S24C: Determine whether the compressor current value is normal. If so, proceed to step S25C; otherwise, shut down the inverter air conditioner. Specifically, when the AC input power is normal, the compressor current value is determined. Whether the current value is normal can be determined by whether it exceeds an upper limit. For example, the current value is determined to exceed 0.5A. If so, the current value is considered abnormal and the inverter air conditioner needs to be shut down. If not, proceed to the following steps.

[0085] S25C, determine whether the operating frequency of the compressor is less than the preset upper limit value. If so, execute step S26C, otherwise turn off the variable frequency air conditioner. S26C, determine whether the operating frequency of the compressor is the preset minimum value. If so, execute step S28C, otherwise execute step S27C; S27C, control the compressor to reduce the frequency to the preset minimum value in a first preset step, and execute step S28C; S28C, control the compressor to operate at the current frequency. Specifically, determine whether the operating frequency of the compressor at this time exceeds the set maximum value, that is, the preset upper limit value. When it exceeds the upper limit value, turn off the variable frequency air conditioner. Otherwise, determine whether the operating frequency of the compressor is the preset minimum value. When it is not the preset minimum value, gradually reduce it to the preset minimum value according to the first preset step. When the operating frequency of the compressor is the preset minimum value, directly control the compressor to operate directly at the current frequency, and control the fan to operate at a medium wind speed.

[0086] Optionally, in the above process, determining whether the first monitoring result is normal includes: de-rating the normal threshold value of the first monitoring result to obtain a first de-rating threshold value, and determining that the first monitoring result is abnormal when the first monitoring result is greater than the first de-rating threshold value. Specifically, in the process of determining whether the first monitoring result of the first temperature sensor is normal, because other sensors have already experienced abnormalities, the normal threshold value of the first monitoring result needs to be de-rating. That is, when all three temperature sensors are normal, the normal threshold value of the first monitoring result is set to ensure normal operation of the air conditioner. For example, if the first monitoring result exceeds 60 degrees Celsius, the air conditioner is directly shut down. This 60 degrees Celsius is the normal threshold value of the first monitoring result. If other sensors are abnormal, the second monitoring result is set to directly shut down when it exceeds 55 degrees Celsius. This 55 degrees Celsius is the first de-rating threshold value obtained by de-rating the normal threshold value of the first monitoring result. In some embodiments, the first de-rating threshold value can be reasonably selected according to different scenarios.

[0087] Optionally, in the above process, determining whether the second monitoring result is normal includes: de-rating the normal threshold value of the second monitoring result to obtain a second de-rating threshold value, and determining that the second monitoring result is abnormal when the second monitoring result is greater than the second de-rating threshold value. Specifically, in the process of determining whether the second monitoring result of the second temperature sensor is normal, because other sensor abnormalities have occurred, the normal threshold value of the second monitoring result needs to be de-rating. That is, when all three temperature sensors are normal, the normal threshold value of the second monitoring result is set to ensure normal operation of the air conditioner. For example, if the second monitoring result exceeds 68 degrees Celsius, the air conditioner is directly shut down. This 68 degrees Celsius is the normal threshold value of the second monitoring result. If other sensor abnormalities occur, the second monitoring result is set to directly shut down when it exceeds 67 degrees Celsius. This 67 degrees Celsius is the second de-rating threshold value obtained by de-rating the normal threshold value of the second monitoring result. In some embodiments, the second de-rating threshold value can be reasonably selected according to different scenarios.

[0088] Optionally, in the above process, determining whether the third monitoring result is normal includes:

[0089] The normal threshold value of the third monitoring result is derated to obtain a third derated threshold value, and the third monitoring result is determined to be abnormal when the third monitoring result is greater than the third derated threshold value. Specifically, in the process of determining whether the third monitoring result of the third temperature sensor is normal, because other sensor abnormalities have occurred, the normal threshold value of the third monitoring result needs to be derated. That is, when all three temperature sensors are normal, the normal threshold value of the third monitoring result is set to ensure the normal operation of the air conditioner. For example, when the third monitoring result exceeds 110 degrees Celsius, the air conditioner is directly shut down. This 110 degrees Celsius is the normal threshold value of the third monitoring result. When other sensor abnormalities occur, the third monitoring result is set to be directly shut down when it exceeds 100 degrees Celsius. This 100 degrees Celsius is the third derated threshold value obtained by derated the normal threshold value of the third monitoring result. In some embodiments, the third derated threshold value can be reasonably selected according to different scenarios.

[0090] Optionally, in the above process, determining whether the AC input power of the inverter air conditioner is normal includes: de-rating the normal threshold value of the AC input power to obtain a fourth de-rating threshold value, and determining that the AC input power of the inverter air conditioner is abnormal when the AC input power is greater than the fourth de-rating threshold value. Specifically, during the monitoring of the AC input power of the inverter air conditioner, if other sensor abnormalities have occurred, it is necessary to de-rating the normal threshold value of the AC input power. That is, when all three temperature sensors are normal, the normal threshold value of the AC input power is set to ensure normal operation of the air conditioner. When the sensor is abnormal, the normal threshold value is reduced. For example, the power of a 1HP air conditioner is reduced by 0.9, that is, the fourth reduction threshold value is 90% of the normal threshold value; the power of a 2HP air conditioner is reduced by 0.75, that is, the fourth reduction threshold value is 75% of the normal threshold value; the power of a 3HP air conditioner is reduced by 0.7, that is, the fourth reduction threshold value is 70% of the normal threshold value. At the same time, it should be understood that the current limit should be ensured during the power reduction.

[0091] In the process of judging the current value of the compressor, different judgment thresholds are set for different air conditioners.

[0092] In addition, such as Figure 5 As shown, in the variable frequency air conditioner outdoor unit control device of the present application, the outdoor unit includes a first temperature sensor for obtaining the ambient temperature, a second temperature sensor for obtaining the outdoor condenser temperature, and a third temperature sensor for obtaining the compressor exhaust temperature; the control device includes:

[0093] a sensor monitoring unit 110 for determining states of the first temperature sensor, the second temperature sensor, and the third temperature sensor according to a first monitoring result corresponding to the first temperature sensor, a second monitoring result corresponding to the second temperature sensor, and a third monitoring result corresponding to the third temperature sensor;

[0094] The first judgment unit 121 is used to judge whether the second monitoring result is normal when only the first temperature sensor is abnormal, and output a positive result if it is normal, otherwise shut down the variable frequency air conditioner;

[0095] The second judgment unit 122 is used to control the compressor to reduce the frequency by a first preset step, and judge whether the third monitoring result is normal. If so, output a positive result; otherwise, shut down the variable frequency air conditioner;

[0096] The third judgment unit 123 is used to judge whether the AC input side power of the variable frequency air conditioner is normal, and if so, output a positive result, otherwise output a negative result;

[0097] The fourth judgment unit 124 is used to judge whether the current value of the compressor is normal, and if so, output a positive result, otherwise output a negative result;

[0098] The first execution unit 131 is used to control the compressor to reduce the frequency at a second preset step until the AC input side power is normal;

[0099] The second execution unit 132 is configured to control the compressor to reduce the frequency at a third preset step until the current value of the compressor is normal;

[0100] The third execution unit 133 is configured to control the compressor to operate at the current frequency.

[0101] Specifically, the specific coordinated operation process between the various units of the variable frequency air conditioner outdoor unit control device here can refer to the above-mentioned variable frequency air conditioner outdoor unit control method, which will not be repeated here.

[0102] In addition, an electronic device of the present application includes a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program to implement any of the variable frequency air conditioner outdoor unit control methods described above. Specifically, according to an embodiment of the present invention, the process described with reference to the flowchart above can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed by an electronic device and, when executed, performs the above-mentioned functions defined in the method of the embodiment of the present invention. The electronic device in the present invention can be a terminal such as a notebook, a desktop, a tablet computer, a smart phone, or a server.

[0103] In addition, the present application provides a computer storage medium having a computer program stored thereon, which implements any one of the above variable frequency air conditioner outdoor unit control methods when the computer program is executed by a processor.

[0104] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0105] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0106] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0107] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. All equivalent variations and modifications within the scope of the claims of the present invention are intended to be covered by the claims of the present invention.

Claims

1. A method for controlling an outdoor unit of a variable frequency air conditioner, characterized in that: The outdoor unit includes a first temperature sensor for obtaining an ambient temperature, a second temperature sensor for obtaining an outdoor condenser temperature, and a third temperature sensor for obtaining a compressor exhaust temperature; the control method includes the following steps: S1. Determine states of the first temperature sensor, the second temperature sensor, and the third temperature sensor according to a first monitoring result corresponding to the first temperature sensor, a second monitoring result corresponding to the second temperature sensor, and a third monitoring result corresponding to the third temperature sensor; S2. When only the first temperature sensor is abnormal, determine whether the second monitoring result is normal. If so, execute step S3; otherwise, shut down the variable frequency air conditioner. S3, controlling the compressor to reduce frequency by a first preset step, and determining whether the third monitoring result is normal, if so, executing step S4, otherwise shutting down the variable frequency air conditioner; S4, determining whether the AC input power of the variable frequency air conditioner is normal, if so, executing step S6, otherwise executing step S5; S5. Controlling the compressor to reduce frequency at a second preset step until the AC input side power is normal, wherein the second preset step is smaller than the first preset step; S6, determining whether the current value of the compressor is normal, if so, executing step S8, otherwise executing step S7; S7, controlling the compressor to reduce frequency at a third preset step until the current value of the compressor is normal; S8. Control the compressor to operate at the current frequency.

2. The control method of the variable frequency air conditioner outdoor unit according to claim 1, characterized in that: The control method further includes: S21A, when only the second temperature sensor is abnormal, determining whether the first monitoring result is normal; if so, executing step S22A; otherwise, shutting down the variable frequency air conditioner; S22A, determining whether the third monitoring result is normal; if so, executing step S23A; otherwise, shutting down the variable frequency air conditioner; S23A, controlling the compressor to reduce frequency at the first preset step, and controlling the fan of the outdoor unit to operate at a high speed mode, until the third monitoring result meets a first preset value; S24A, controlling the fan to operate in medium speed mode, and determining whether the AC input power of the variable frequency air conditioner is normal; if so, executing step S26A; otherwise, executing step S25A; S25A, controlling the compressor to continue frequency reduction at the first preset step, and controlling the outdoor fan to operate at high speed until the AC input side power of the variable frequency air conditioner is normal; S26A, determining whether the current value of the compressor is normal, if so, executing step S28A, otherwise executing step S27A; S27A, controlling the compressor to continue reducing the frequency at the first preset step, and controlling the fan of the outdoor unit to operate at a high speed until the current value of the compressor is normal; S28A: Control the compressor to operate at the current frequency, and control the fan to operate at a medium speed mode.

3. The control method of the variable frequency air conditioner outdoor unit according to claim 1, characterized in that: The control method further includes: S21B, when only the third temperature sensor is abnormal, determining whether the first monitoring result is normal; if so, executing step S22B; otherwise, shutting down the variable frequency air conditioner; S22B, determining whether the second monitoring result is normal; if so, executing step S23B; otherwise, shutting down the variable frequency air conditioner; S23B, controlling the compressor to reduce frequency at the first preset step, and controlling the fan of the outdoor unit to operate at a high speed mode until the second monitoring result meets a second preset value; S24B, controlling the fan to operate in medium speed mode, and determining whether the AC input power of the variable frequency air conditioner is normal; if so, executing step S26B; otherwise, executing step S25B; S25B, controlling the compressor to continue reducing the frequency at the first preset step to a preset limit value, and controlling the fan of the outdoor unit to operate at a high speed mode until the AC input side power of the variable frequency air conditioner is normal; S26B, determining whether the current value of the compressor is normal, if so, executing step S28B, otherwise executing step S27B; S27B, controlling the compressor to continue reducing the frequency at the first preset step, and controlling the fan of the outdoor unit to operate at a high speed mode until the current value of the compressor is normal; S28B, controlling the compressor to operate at the current frequency, and controlling the fan to operate at a medium speed mode.

4. The control method of the variable frequency air conditioner outdoor unit according to claim 1, characterized in that: The control method further includes: S21C, when at least two of the first temperature sensor, the second temperature sensor, and the third temperature sensor are abnormal, determining whether the DC bus voltage of the variable frequency air conditioner is normal; if so, executing step S22C; otherwise, controlling the compressor to operate at a preset compression frequency; S22C, controlling the outdoor unit's fan to operate in high-speed mode, and monitoring whether the temperature rise state of the IPM device in the air conditioner is normal. If so, executing step S23C; otherwise, shutting down the variable frequency air conditioner; S23C, controlling the compressor to reduce frequency by the first preset step, and determining whether the AC input power of the variable frequency air conditioner is normal; if so, executing step S24C; otherwise, shutting down the variable frequency air conditioner; S24C, determining whether the current value of the compressor is normal; if so, executing step S25C; otherwise, shutting down the variable frequency air conditioner; S25C, determining whether the operating frequency of the compressor is less than a preset upper limit; if so, executing step S26C; otherwise, shutting down the variable frequency air conditioner; S26C, determining whether the compressor operating frequency is a preset minimum value; if so, executing step S28C; otherwise, executing step S27C; S27C, controlling the compressor to reduce the frequency to the preset minimum value at the first preset step, and executing step S28C; S28C, controlling the compressor to operate at the current frequency.

5. The method for controlling an outdoor unit of a variable frequency air conditioner according to claim 2 or 3, wherein: Determining whether the first monitoring result is normal includes: The normal threshold value of the first monitoring result is derated to obtain a first derated threshold value, and when the first monitoring result is greater than the first derated threshold value, it is determined that the first monitoring result is abnormal.

6. The method for controlling an outdoor unit of a variable frequency air conditioner according to claim 1 or 3, wherein: Determining whether the second monitoring result is normal includes: The normal threshold value of the second monitoring result is derated to obtain a second derated threshold value, and when the second monitoring result is greater than the second derated threshold value, it is determined that the second monitoring result is abnormal.

7. The method for controlling an outdoor unit of a variable frequency air conditioner according to claim 1 or 2, wherein: The determining whether the third monitoring result is normal includes: The normal threshold value of the third monitoring result is derated to obtain a third derated threshold value, and when the third monitoring result is greater than the third derated threshold value, it is determined that the third monitoring result is abnormal.

8. The method for controlling an outdoor unit of a variable frequency air conditioner according to any one of claims 1 to 4, characterized in that: The determining whether the AC input power of the variable frequency air conditioner is normal includes: derate the normal threshold value of the AC input side power to obtain a fourth derated threshold value, and determine that the AC input side power of the variable frequency air conditioner is abnormal when the AC input side power is greater than the fourth derated threshold value; and / or The third preset step is the same as the first preset step.

9. A variable frequency air conditioner outdoor unit control device, characterized in that: Used to execute the variable frequency air conditioner outdoor unit control method according to any one of claims 1 to 8, wherein the outdoor unit includes a first temperature sensor for obtaining an ambient temperature, a second temperature sensor for obtaining an outdoor condenser temperature, and a third temperature sensor for obtaining a compressor exhaust temperature; the control device includes: a sensor monitoring unit, configured to determine states of the first temperature sensor, the second temperature sensor, and the third temperature sensor according to a first monitoring result corresponding to the first temperature sensor, a second monitoring result corresponding to the second temperature sensor, and a third monitoring result corresponding to the third temperature sensor; a first determining unit, configured to determine whether the second monitoring result is normal when only the first temperature sensor is abnormal, and output a positive result if so, otherwise shutting down the variable frequency air conditioner; a second determining unit, configured to control the compressor to reduce frequency by a first preset step, and determine whether the third monitoring result is normal, and if so, output a positive result; otherwise, shut down the variable frequency air conditioner; a third judging unit, configured to judge whether the AC input side power of the variable frequency air conditioner is normal, and if so, output a positive result, otherwise output a negative result; a fourth judgment unit, configured to judge whether the current value of the compressor is normal, and output a positive result if so, or a negative result if otherwise; a first execution unit, configured to control the compressor to reduce frequency at a second preset step until the AC input side power is normal; a second execution unit, configured to control the compressor to reduce frequency at a third preset step until the current value of the compressor is normal; The third execution unit is configured to control the compressor to operate at a current frequency.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and the computer program is suitable for being loaded by a processor to execute the steps of the variable frequency air conditioner outdoor unit control method according to any one of claims 1 to 8.

11. A computer, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the variable frequency air conditioner outdoor unit control method according to any one of claims 1 to 8 by calling the computer program stored in the memory.

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