Control method and system of air conditioning system

Abstract

The invention provides a control method and system of an air conditioning system. The control method comprises the following steps that the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of a compressor of the air conditioning system are obtained; according to the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor, the operation state of the air conditioning system is judged; and controlling the air conditioning system to operate according to the operation state of the compressor. According to the method, a pressure signal of the pressure sensor is detected and fed back to the electronic monitor, and the electronic monitor judges whether the pressure of the high-pressure side and the low-pressure side is in a normal range. Under the condition that the refrigeration switch is turned on, the pressure of the low-pressure side is abnormally increased, the pressure of the high-pressure side is abnormally reduced, the electronic monitor gives an alarm, and the clutch electromagnet is automatically disconnected, so that a driver can continue to work and select a machine for maintenance, and belt breakage and even more serious accidents caused by locking of the compressor can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of engineering machinery, and in particular to a control method and system for an air-conditioning system. Background Art

[0002] The working conditions of construction machinery are generally harsh, especially in hot weather. The temperature in the cab is particularly high, and the drivers are gradually getting younger and have higher requirements for comfort.

[0003] In this context, the cooling effect of the air conditioning system is particularly important. However, the current situation is that the compressor is locked due to abnormal conditions, and there is no alarm signal. If it does not stop, the compressor belt will break. If the broken belt is wrapped around the fan or flies out of the machine, it may cause a serious accident. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a control method and system for an air conditioning system, which can provide timely feedback on the system status, control the system operation in real time, and improve the system safety.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a method for controlling an air conditioning system, comprising the following steps: Obtaining the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor of the air-conditioning system; Determining the operating state of the air conditioning system according to the refrigerant pressure on the high-pressure side and the refrigerant pressure on the low-pressure side of the compressor; The operation of the air conditioning system is controlled according to the operating state of the compressor.

[0006] Furthermore, the method for obtaining the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor of the air-conditioning system includes: Obtaining a refrigerant high-pressure side pressure sensor signal through a high-pressure side pressure sensor installed on the high-pressure side of the compressor; Obtaining a refrigerant low-pressure side pressure sensor signal through a low-pressure side pressure sensor installed on the low-pressure side of the compressor; The refrigerant high-pressure side pressure sensor signal and the refrigerant low-pressure side pressure sensor signal are processed to obtain the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor.

[0007] Further, judging the operating state of the air conditioning system according to the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor includes: Determine whether the compressor is in cooling mode; Obtain the refrigerant pressure range on the high-pressure side under the preset refrigeration mode and the refrigerant pressure range on the low-pressure side under the preset refrigeration mode; When the compressor is in cooling mode, determining whether the high-pressure side refrigerant pressure is within the high-pressure side refrigerant pressure range in cooling mode and whether the low-pressure side refrigerant pressure is within the low-pressure side refrigerant pressure range in cooling mode; If the high-pressure side refrigerant pressure is within the high-pressure side refrigerant pressure range in the cooling mode and the low-pressure side refrigerant pressure is within the low-pressure side refrigerant pressure range in the cooling mode, it is determined that the operating state of the air-conditioning system is normal.

[0008] Controlling the operation of the air conditioning system according to the operating state of the compressor includes: If the operating status of the air conditioning system is normal, no control is performed.

[0009] Furthermore, the method for determining whether the compressor is in cooling mode includes: Get the signal of the refrigeration switch. If the refrigeration switch is turned on, the compressor is in the refrigeration mode. If the refrigeration switch is turned off, the compressor is in the non-refrigeration mode.

[0010] Further, when the compressor is in the cooling mode, if the high-pressure side refrigerant pressure is lower than the high-pressure side refrigerant pressure range in the cooling mode and the low-pressure side refrigerant pressure is higher than the low-pressure side refrigerant pressure range in the cooling mode, the refrigeration core temperature is obtained; Determining whether the refrigeration core temperature is within a preset refrigeration core temperature range, and if so, determining that the operating state of the air-conditioning system is a compressor failure state; If the refrigeration core temperature is not within the preset refrigeration core temperature range, it is judged as an overcooling state, and the air conditioning system automatically turns off the compressor, which is a normal control state; If the air conditioning system is in an overcooling state, the compressor clutch is disconnected to reduce the refrigeration effect and perform defrosting. When the refrigeration core temperature returns to the preset refrigeration core temperature range, the clutch is energized. If the operating state of the air conditioning system is a compressor failure state, the compressor clutch is forced to be disconnected to cut off the power to the clutch, stop the compressor from running, and output an alarm signal.

[0011] Furthermore, the method for obtaining the temperature of the refrigeration core includes obtaining a refrigeration core temperature sensor signal through a refrigeration core temperature sensor, and obtaining the refrigeration core temperature through data processing.

[0012] Furthermore, when the compressor is in the refrigeration mode, if the high-pressure side refrigerant pressure is higher than the high-pressure side refrigerant pressure range in the refrigeration mode and the low-pressure side refrigerant pressure is lower than the low-pressure side refrigerant pressure range in the refrigeration mode, the operating state of the air-conditioning system is judged to be a failure state of the air-conditioning system expansion valve.

[0013] Controlling the operation of the air conditioning system according to the operating state of the compressor includes: If the operating state of the air-conditioning system is a failure state of the expansion valve of the air-conditioning system, the air-conditioning system is shut down, and an alarm signal is generated and outputted at the same time.

[0014] Further, judging the operating state of the air conditioning system according to the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor further includes: Obtain a preset high-pressure side refrigerant pressure range in a non-refrigeration mode and a preset low-pressure side refrigerant pressure range in a non-refrigeration mode; When the compressor is in non-refrigeration mode, if the high-pressure side refrigerant pressure is in the high-pressure side refrigerant pressure range in non-refrigeration mode and the low-pressure side refrigerant pressure is in the low-pressure side refrigerant pressure range in non-refrigeration mode, the operating state of the air-conditioning system is judged to be normal.

[0015] Furthermore, when the compressor is in a non-refrigeration mode, if the high-pressure side refrigerant pressure is lower than the high-pressure side refrigerant pressure range in the non-refrigeration mode or the low-pressure side refrigerant pressure is lower than the low-pressure side refrigerant pressure range in the non-refrigeration mode, the operating state of the air-conditioning system is judged to be a refrigerant leakage state.

[0016] Controlling the operation of the air conditioning system according to the operating state of the compressor includes: If the operating state of the air conditioning system is a refrigerant leakage state, a maintenance reminder signal is generated and output.

[0017] Further, controlling the operation of the air conditioning system according to the operating state of the compressor includes: If the operating status of the air conditioning system is normal, no control is performed; If the air conditioning system is in an overcooling state, the clutch of the compressor is disconnected, the clutch is powered off, the compressor stops running, and the defrosting is performed. When the temperature of the refrigeration core returns to the preset refrigeration core temperature range, the clutch is powered on. If the operating state of the air conditioning system is a compressor failure state, the compressor clutch is forced to be disconnected, the clutch is powered off, and the compressor stops running; If the operating state of the air conditioning system is the failure state of the expansion valve of the air conditioning system, the air conditioning system is controlled to be shut down, and an alarm signal is generated and outputted at the same time; If the operating state of the air conditioning system is a refrigerant leakage state, a maintenance reminder signal is generated and output.

[0018] In a second aspect, the present invention provides an air conditioning control system, including a controller, an electronic monitor, a high-pressure side pressure sensor, and a low-pressure side pressure sensor; The high-pressure side pressure sensor is installed on the high-pressure side of the compressor and is used to obtain the refrigerant high-pressure side pressure sensor signal; The low-pressure side pressure sensor is installed on the low-pressure side of the compressor and is used to obtain the refrigerant low-pressure side pressure sensor signal; The controller is used to obtain the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor of the air-conditioning system according to the refrigerant high-pressure side pressure sensor signal and the refrigerant low-pressure side pressure sensor signal; The electronic monitor is used to execute the control method as described in the first aspect according to the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor of the air-conditioning system, generate corresponding control instructions and send them to the controller for execution.

[0019] Furthermore, the air conditioning control system further comprises a refrigeration core temperature sensor, which is used to obtain a refrigeration core temperature sensor signal and transmit it to the controller; The controller obtains the refrigeration core temperature according to the refrigeration core temperature sensor signal and transmits it to the electronic monitor; The electronic monitor is preset with the high-pressure side refrigerant pressure range, the low-pressure side refrigerant pressure range, the refrigeration core temperature range and the high and low pressure ranges in the non-refrigeration mode; after receiving the signal transmitted by the controller, the electronic monitor performs the following judgment: Obtain the refrigerant pressure range on the high-pressure side under the preset refrigeration mode and the refrigerant pressure range on the low-pressure side under the preset refrigeration mode; When the compressor is in cooling mode, if the high-pressure side refrigerant pressure is within the high-pressure side refrigerant pressure range in cooling mode and the low-pressure side refrigerant pressure is within the low-pressure side refrigerant pressure range in cooling mode, the operating state of the air-conditioning system is judged to be normal and no control is performed at this time.

[0020] When the compressor is in cooling mode, if the high-pressure side refrigerant pressure is lower than the high-pressure side refrigerant pressure range in cooling mode and the low-pressure side refrigerant pressure is higher than the low-pressure side refrigerant pressure range in cooling mode, the refrigeration core temperature is obtained; Determine whether the refrigeration core temperature is within a preset refrigeration core temperature range, and if so, determine that the operating state of the air conditioning system is a compressor failure state, and control the forced disconnection of the compressor clutch to cut off the clutch power and stop the compressor from running; If the refrigeration core temperature is lower than the preset refrigeration core temperature range, it is judged as an overcooling state, and the compressor clutch is controlled to disconnect, the refrigeration effect is reduced, and defrosting is performed. When the refrigeration core temperature returns to the preset refrigeration core temperature range, the clutch is controlled to be energized.

[0021] When the compressor is in cooling mode, if the high-pressure side refrigerant pressure is higher than the high-pressure side refrigerant pressure range in cooling mode and the low-pressure side refrigerant pressure is lower than the low-pressure side refrigerant pressure range in cooling mode, the operating state of the air-conditioning system is judged to be a failure state of the air-conditioning system expansion valve, the air-conditioning system is controlled to be shut down, and an alarm signal is generated and output.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. By obtaining the refrigerant pressure on the high-pressure side and the refrigerant pressure on the low-pressure side of the compressor of the air-conditioning system, real-time detection can be performed to obtain the operating status of the air-conditioning system through dynamic detection, so that timely feedback and adjustment can be made; 2. This method can be used when the compressor is locked due to an abnormal situation. When the controller detects that the pressure exceeds the set range, it will provide feedback and automatically disconnect the clutch power supply and the clutch to avoid causing greater losses.

[0023] 3. This method can also be repaired at an appropriate time according to the progress of the project; 4. This method can detect whether there is refrigerant leakage in the air-conditioning system when the air-conditioning system is in non-cooling mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 : Schematic diagram of compressor installation.

[0025] Figure 2 : Compressor operating status judgment logic diagram. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention. Example 1

[0027] This embodiment provides a control method for an air conditioning system. Figure 2 As shown, the following steps are included: Obtaining the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor of the air-conditioning system; Determining the operating state of the air conditioning system according to the refrigerant pressure on the high-pressure side and the refrigerant pressure on the low-pressure side of the compressor; The operation of the air conditioning system is controlled according to the operating state of the compressor.

[0028] Specifically, the method for obtaining the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor of the air-conditioning system includes: Obtaining a refrigerant high-pressure side pressure sensor signal through a high-pressure side pressure sensor installed on the high-pressure side of the compressor; Obtaining a refrigerant low-pressure side pressure sensor signal through a low-pressure side pressure sensor installed on the low-pressure side of the compressor; The refrigerant high-pressure side pressure sensor signal and the refrigerant low-pressure side pressure sensor signal are processed to obtain the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor.

[0029] Specifically, judging the operating state of the air conditioning system according to the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor includes: Determine whether the compressor is in cooling mode; Obtain the refrigerant pressure range on the high-pressure side under the preset refrigeration mode and the refrigerant pressure range on the low-pressure side under the preset refrigeration mode; When the compressor is in cooling mode, determining whether the high-pressure side refrigerant pressure is within the high-pressure side refrigerant pressure range in cooling mode and whether the low-pressure side refrigerant pressure is within the low-pressure side refrigerant pressure range in cooling mode; If the high-pressure side refrigerant pressure is within the high-pressure side refrigerant pressure range in the cooling mode and the low-pressure side refrigerant pressure is within the low-pressure side refrigerant pressure range in the cooling mode, it is determined that the operating state of the air-conditioning system is normal.

[0030] Specifically, the method for determining whether the compressor is in the cooling mode includes: Get the signal of the refrigeration switch. If the refrigeration switch is turned on, the compressor is in the refrigeration mode. If the refrigeration switch is turned off, the compressor is in the non-refrigeration mode.

[0031] Specifically, when the compressor is in the cooling mode, if the high-pressure side refrigerant pressure is lower than the high-pressure side refrigerant pressure range in the cooling mode and the low-pressure side refrigerant pressure is higher than the low-pressure side refrigerant pressure range in the cooling mode, the refrigeration core temperature is obtained; Determining whether the refrigeration core temperature is within a preset refrigeration core temperature range, and if so, determining that the operating state of the air-conditioning system is a compressor failure state; If the refrigeration core temperature is not within the preset refrigeration core temperature range, it is judged to be in an overcooling state; Specifically, the method for obtaining the refrigeration core temperature includes obtaining a refrigeration core temperature sensor signal through a refrigeration core temperature sensor, and obtaining the refrigeration core temperature through data processing.

[0032] Specifically, when the compressor is in the refrigeration mode, if the high-pressure side refrigerant pressure is higher than the high-pressure side refrigerant pressure range in the refrigeration mode and the low-pressure side refrigerant pressure is lower than the low-pressure side refrigerant pressure range in the refrigeration mode, the operating state of the air-conditioning system is judged to be a failure state of the air-conditioning system expansion valve.

[0033] Preferably, the refrigerant pressure range on the high-pressure side in the preset refrigeration mode is: 0.8-1.9MPa; The low-pressure side refrigerant pressure range in the preset refrigeration mode is: 0.12-0.3MPa; Preset refrigeration core temperature range: 1-6℃; In the preset non-refrigeration mode, the high and low pressure measurement ranges are both 0.6-0.8MPa.

[0034] Specifically, judging the operating state of the air conditioning system according to the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor further includes: Obtain a preset high-pressure side refrigerant pressure range in a non-refrigeration mode and a preset low-pressure side refrigerant pressure range in a non-refrigeration mode; When the compressor is in non-refrigeration mode, if the high-pressure side refrigerant pressure is in the high-pressure side refrigerant pressure range in non-refrigeration mode and the low-pressure side refrigerant pressure is in the low-pressure side refrigerant pressure range in non-refrigeration mode, the operating state of the air-conditioning system is judged to be normal.

[0035] Specifically, controlling the operation of the air conditioning system according to the operating state of the compressor includes: If the operating status of the air conditioning system is normal, no control is performed; If the air conditioning system is in an overcooling state, the compressor clutch is disconnected to reduce the refrigeration effect and perform defrosting. When the refrigeration core temperature returns to the preset refrigeration core temperature range, the clutch is energized. If the operating state of the air conditioning system is a compressor failure state, the compressor clutch is forced to be disconnected, the clutch is powered off, and the compressor stops running; If the operating state of the air conditioning system is the failure state of the expansion valve of the air conditioning system, the air conditioning system is controlled to be shut down, and an alarm signal is generated and outputted at the same time; If the operating state of the air conditioning system is a refrigerant leakage state, a maintenance reminder signal is generated and output. Example 2

[0036] Based on the same inventive concept as that of Embodiment 1, this embodiment provides an air conditioning control system, such as Figure 1 As shown, it includes an electronic monitor, a controller (either a vehicle controller or an air-conditioning system controller), a high-pressure side pressure sensor, a low-pressure side pressure sensor, and a refrigeration core temperature sensor. The controller detects pressure changes and refrigeration core temperature changes and feeds back to the electronic monitor. The electronic monitor determines the operating status of the compressor based on the pressure and temperature.

[0037] During vehicle operation, turn on the refrigeration switch, the compressor clutch engages, and refrigeration starts. The controller detects the high and low pressure refrigerant pressures measured by the pressure sensor and feeds back to the electronic monitor.

[0038] The electronic monitor is preset with the high-pressure side refrigerant pressure range, low-pressure side refrigerant pressure range, refrigeration core temperature range in refrigeration mode and high and low pressure measurement ranges in non-refrigeration mode.

[0039] Preferably, the refrigerant pressure range on the high-pressure side in the preset refrigeration mode is: 0.8-1.9MPa; The low-pressure side refrigerant pressure range in the preset refrigeration mode is: 0.12-0.3MPa; Preset refrigeration core temperature range: 1-6℃; In the preset non-refrigeration mode, the high and low pressure measurement ranges are both 0.6-0.8MPa.

[0040] like Figure 2 As shown, the electronic monitor receives the pressure and temperature transmitted by the controller and makes a judgment: In cooling mode, if the controller detects that both the high and low side refrigerant pressures are within the set range, the compressor rotates normally and the refrigeration works normally; if the high-pressure side refrigerant pressure decreases and the low-pressure side refrigerant pressure increases and both exceed the range, the controller further reads the temperature of the refrigeration core temperature sensor.

[0041] If the temperature is lower than the normal range, the phenomenon of "the refrigerant pressure on the high-pressure side decreases, and the refrigerant pressure on the low-pressure side increases and both exceed the range" is caused by the mechanism of the air conditioning system to actively disconnect the clutch power supply to prevent the refrigeration core from frosting and affecting the refrigeration effect. The system is in normal operation; If the temperature is within the normal range, the phenomenon of "reduced refrigerant pressure on the high-pressure side and increased refrigerant pressure on the low-pressure side and both exceeding the range" is caused by the locking of the compressor. The electronic monitor sends a command to disconnect the clutch power to the controller. The controller executes the above command, and the clutch is powered off and separated from the compressor rotor to avoid other faults such as belt breakage and abnormal noise. At the same time as the power is cut off, the electronic monitor alarms to remind the cab crew to repair at an appropriate time. After the clutch power is disconnected, other components will not be damaged due to the locking of the compressor. Maintenance personnel can choose an appropriate time to repair according to the actual progress of the project without delaying the construction period.

[0042] Specifically, if the refrigerant pressure on the high-pressure side increases and the refrigerant pressure on the low-pressure side decreases and exceeds the range, it is determined that the expansion valve of the air-conditioning system is blocked, and the electronic monitor alarms. Maintenance personnel can choose an opportunity to repair according to the actual progress of the project without delaying the construction period.

[0043] In non-cooling mode, the controller can regularly detect the pressure of the air-conditioning system. If the pressure is within the set range, the system is normal. If the pressure of the air-conditioning system is lower than the set pressure, there is a refrigerant leak and maintenance should be carried out in advance to avoid delays in the construction period due to temporary maintenance when cooling is needed.

[0044] When the compressor is locked due to an abnormal condition, the controller detects that the pressure exceeds the set range and feeds back to the electronic monitor. The electronic monitor automatically disconnects the clutch power supply and the clutch is disconnected to avoid causing greater losses.

[0045] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0046] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0047] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0048] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that: The following steps are involved: Obtaining the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor of the air-conditioning system; Determining the operating state of the air conditioning system according to the refrigerant pressure on the high-pressure side and the refrigerant pressure on the low-pressure side of the compressor; The operation of the air conditioning system is controlled according to the operating state of the compressor.

2. The control method of the air conditioning system according to claim 1, characterized in that: The method for obtaining the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor of the air-conditioning system includes: Obtaining a refrigerant high-pressure side pressure sensor signal through a high-pressure side pressure sensor installed on the high-pressure side of the compressor; Obtaining a refrigerant low-pressure side pressure sensor signal through a low-pressure side pressure sensor installed on the low-pressure side of the compressor; The refrigerant high-pressure side pressure sensor signal and the refrigerant low-pressure side pressure sensor signal are processed to obtain the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor.

3. The control method of the air conditioning system according to claim 1, characterized in that: The operation state of the air conditioning system is judged according to the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor, including: Determine whether the compressor is in cooling mode; Obtain the refrigerant pressure range on the high-pressure side under the preset refrigeration mode and the refrigerant pressure range on the low-pressure side under the preset refrigeration mode; When the compressor is in cooling mode, determining whether the high-pressure side refrigerant pressure is within the high-pressure side refrigerant pressure range in cooling mode and whether the low-pressure side refrigerant pressure is within the low-pressure side refrigerant pressure range in cooling mode; If the high-pressure side refrigerant pressure is within the high-pressure side refrigerant pressure range in the cooling mode and the low-pressure side refrigerant pressure is within the low-pressure side refrigerant pressure range in the cooling mode, it is determined that the operating state of the air-conditioning system is normal; Controlling the operation of the air conditioning system according to the operating state of the compressor includes: If the operating status of the air conditioning system is normal, no control is performed.

4. The control method of the air conditioning system according to claim 3, characterized in that: Methods for determining whether the compressor is in cooling mode include: Get the signal of the refrigeration switch. If the refrigeration switch is turned on, the compressor is in the refrigeration mode. If the refrigeration switch is turned off, the compressor is in the non-refrigeration mode.

5. The control method of the air conditioning system according to claim 3, characterized in that: When the compressor is in cooling mode, if the high-pressure side refrigerant pressure is lower than the high-pressure side refrigerant pressure range in cooling mode and the low-pressure side refrigerant pressure is higher than the low-pressure side refrigerant pressure range in cooling mode, the refrigeration core temperature is obtained; Determining whether the refrigeration core temperature is within a preset refrigeration core temperature range, and if so, determining that the operating state of the air-conditioning system is a compressor failure state; If the refrigeration core temperature is not within the preset refrigeration core temperature range, it is judged to be in an overcooling state; Controlling the operation of the air conditioning system according to the operating state of the compressor includes: If the air conditioning system is in an overcooling state, the clutch of the compressor is disconnected, the clutch is powered off, the compressor stops running, and the defrosting is performed. When the temperature of the refrigeration core returns to the preset refrigeration core temperature range, the clutch is powered on. If the operating state of the air conditioning system is a compressor failure state, the compressor clutch is forced to be disconnected to cut off the power to the clutch, stop the compressor from running, and output an alarm signal.

6. The control method of the air conditioning system according to claim 5, characterized in that: The method for obtaining the temperature of a refrigeration core includes obtaining a refrigeration core temperature sensor signal through a refrigeration core temperature sensor, and obtaining the refrigeration core temperature through data processing.

7. The control method of the air conditioning system according to claim 3, characterized in that: When the compressor is in cooling mode, if the high-pressure side refrigerant pressure is higher than the high-pressure side refrigerant pressure range in cooling mode and the low-pressure side refrigerant pressure is lower than the low-pressure side refrigerant pressure range in cooling mode, it is determined that the operating state of the air-conditioning system is an expansion valve failure state of the air-conditioning system; Controlling the operation of the air conditioning system according to the operating state of the compressor includes: If the operating state of the air-conditioning system is a failure state of the expansion valve of the air-conditioning system, the air-conditioning system is shut down, and an alarm signal is generated and outputted at the same time.

8. The control method of the air conditioning system according to claim 3, characterized in that: The operating state of the air conditioning system is judged according to the refrigerant pressure on the high-pressure side and the refrigerant pressure on the low-pressure side of the compressor, and further includes: Obtain a preset high-pressure side refrigerant pressure range in a non-refrigeration mode and a preset low-pressure side refrigerant pressure range in a non-refrigeration mode; When the compressor is in non-refrigeration mode, if the high-pressure side refrigerant pressure is in the high-pressure side refrigerant pressure range in non-refrigeration mode and the low-pressure side refrigerant pressure is in the low-pressure side refrigerant pressure range in non-refrigeration mode, the operating state of the air-conditioning system is judged to be normal.

9. The control method of the air conditioning system according to claim 3, characterized in that: When the compressor is in non-refrigeration mode, if the high-pressure side refrigerant pressure is lower than the high-pressure side refrigerant pressure range in the non-refrigeration mode or the low-pressure side refrigerant pressure is lower than the low-pressure side refrigerant pressure range in the non-refrigeration mode, it is determined that the operating state of the air-conditioning system is a refrigerant leakage state; Controlling the operation of the air conditioning system according to the operating state of the compressor includes: If the operating state of the air conditioning system is a refrigerant leakage state, a maintenance reminder signal is generated and output.

10. An air conditioning control system, characterized in that: It includes a controller, an electronic monitor, a high-pressure side pressure sensor, and a low-pressure side pressure sensor; The high-pressure side pressure sensor is installed on the high-pressure side of the compressor and is used to obtain the refrigerant high-pressure side pressure sensor signal; The low-pressure side pressure sensor is installed on the low-pressure side of the compressor and is used to obtain the refrigerant low-pressure side pressure sensor signal; The controller is used to obtain the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor of the air-conditioning system according to the refrigerant high-pressure side pressure sensor signal and the refrigerant low-pressure side pressure sensor signal; The electronic monitor is used to execute the control method as claimed in claim 1 according to the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the compressor of the air-conditioning system, generate corresponding control instructions and send them to the controller for execution.

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