Thermal management air conditioning protection methods, devices, equipment and vehicles

Abstract

This application provides a compressor protection method, device, equipment, and vehicle. By monitoring the operating data of the thermal management system, and based on the operating data, according to the air conditioning system protection strategy, the compressor in the thermal management air conditioning system is controlled to maintain its speed, reduce its speed, stop, or lock. In order to take different protection measures in a timely manner when the thermal management air conditioning system is malfunctioning, based on the operating data and according to the air conditioning system protection strategy, that is, to control the compressor to maintain its speed, reduce its speed, stop, or lock, thereby achieving multi-level and multi-condition protection of the compressor in the thermal management air conditioning system and avoiding losses caused by direct compressor shutdown.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, specifically to a compressor protection method, device, equipment, and vehicle. Background Technology

[0002] Thermal management air conditioning systems are air conditioning systems that integrate multiple thermal management technologies. They not only have the cooling, heating, and dehumidification functions of traditional air conditioners, but also emphasize the efficient management and utilization of thermal energy.

[0003] In the existing technology, when a thermal management air conditioning system is running, high and low pressure protection strategies and anti-icing protection strategies are usually adopted. In case of abnormality, the compressor of the thermal management air conditioning system is controlled to stop, so as to protect the thermal management air conditioning system, or in other words, to protect the compressor of the thermal management air conditioning system.

[0004] However, in the actual operation of thermal management air conditioning systems, there are various abnormal situations, which are not limited to high and low pressure or icing abnormalities. When other abnormalities occur, it is difficult to protect the compressor of the thermal management air conditioning system. Furthermore, directly controlling the compressor of the thermal management air conditioning system to shut down during abnormalities may damage the equipment in the thermal management air conditioning system or affect the indoor occupants' experience, thus reducing the effectiveness of protecting the compressor of the thermal management air conditioning system. Summary of the Invention

[0005] Based on the defects and shortcomings of the existing technology, this application proposes a compressor protection method, device, equipment, and vehicle, which can control the compressor to maintain its speed, reduce its speed, stop, or lock it according to the air conditioning system protection strategy based on the monitored operating data of the thermal management air conditioning system. This achieves hierarchical and condition-specific protection of the compressor in the thermal management air conditioning system, and solves the problem that directly controlling the compressor to stop when the thermal management air conditioning system is abnormal may cause equipment damage or affect the indoor occupants' experience, thus reducing the effectiveness of compressor protection.

[0006] According to a first aspect of the embodiments of this application, a compressor protection method is provided, applied in a thermal management air conditioning system, the thermal management air conditioning system including the compressor, the method comprising:

[0007] Monitor the operating data of the thermal management air conditioning system;

[0008] Based on the operational data, and in accordance with the air conditioning system protection strategy, the compressor is controlled to maintain its speed, reduce its speed, stop, or lock.

[0009] According to a second aspect of the embodiments of this application, a compressor protection device is provided, applied in a thermal management air conditioning system, the thermal management air conditioning system including the compressor, the device comprising:

[0010] The monitoring module is used to monitor the operating data of the thermal management air conditioning system;

[0011] The control module is used to control the compressor to maintain its speed, reduce its speed, stop, or lock it based on the operating data and in accordance with the air conditioning system protection strategy.

[0012] According to a third aspect of the embodiments of this application, an electronic device is provided, including a memory and a processor;

[0013] The memory is connected to the processor and is used to store programs;

[0014] The processor is used to implement the compressor protection method as described in the first aspect by running a program in the memory.

[0015] According to a fourth aspect of the embodiments of this application, a storage medium is provided, on which a computer program is stored, and when the computer program is run by a processor, it implements the compressor protection method as described in the first aspect.

[0016] According to a fifth aspect of the embodiments of this application, a vehicle is provided, wherein the vehicle is provided with a compressor protection device as described in the second aspect, or an electronic device as described in the third aspect.

[0017] In the aforementioned compressor protection methods, devices, equipment, and vehicles, the operating data of the thermal management system can be monitored. Based on the operating data and in accordance with the air conditioning system protection strategy, the compressor in the thermal management air conditioning system can be controlled to maintain its speed, reduce its speed, stop, or lock. In the event of abnormal operation of the thermal management air conditioning system, different protection measures can be taken in a timely manner based on the operating data and in accordance with the air conditioning system protection strategy, namely, controlling the compressor to maintain its speed, reduce its speed, stop, or lock. This achieves hierarchical and condition-specific protection of the compressor in the thermal management air conditioning system, avoiding losses caused by direct compressor shutdown. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram illustrating a feasible application scenario of a compressor protection method according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the flow of a compressor protection method according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of a high-voltage protection process provided in an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of a low-voltage protection process proposed in an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of an exhaust temperature protection process proposed in an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of an anti-icing protection process proposed in an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of an overheat protection process proposed in an embodiment of this application;

[0026] Figure 8 This is a schematic diagram of the structure of a compressor protection device proposed in an embodiment of this application;

[0027] Figure 9 This is a schematic diagram of the structure of an electronic device proposed in an embodiment of this application. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Overview

[0030] As described in the background section, in existing technologies, thermal management air conditioning systems typically employ high and low pressure protection strategies and anti-icing protection strategies during operation. These strategies aim to shut down the compressor in case of abnormalities, thereby protecting the system or, in other words, the compressor. However, in actual operation, thermal management air conditioning systems experience a variety of abnormal situations, not limited to high / low pressure or icing anomalies. Protecting the compressor is difficult when other anomalies occur, and directly shutting down the compressor during anomalies may damage equipment or negatively impact the comfort of indoor occupants, thus reducing the effectiveness of compressor protection.

[0031] Based on this, the inventors further discovered that by monitoring the operating data of the thermal management system, and according to the air conditioning system protection strategy, the compressor in the thermal management air conditioning system can be controlled to maintain its speed, reduce its speed, stop, or lock. In the event of abnormal operation of the thermal management air conditioning system, different protective measures can be taken in a timely manner based on the operating data and the air conditioning system protection strategy, namely, controlling the compressor to maintain its speed, reduce its speed, stop, or lock. This achieves hierarchical and condition-specific protection of the compressor in the thermal management air conditioning system, avoiding losses caused by direct compressor shutdown.

[0032] Based on the above concept, this specification provides a compressor protection method, which will be described exemplarily below with reference to the accompanying drawings.

[0033] Exemplary scenario

[0034] refer to Figure 1 , Figure 1 This is a schematic diagram of a feasible application scenario for compressor protection methods, namely, a thermal management air conditioning system.

[0035] like Figure 1 As shown, the thermal management air conditioning system includes a compressor 110, a condenser 120, a first electronic expansion valve 130 (EXV1), and an evaporator 140.

[0036] When the cab needs cooling, the first electronic expansion valve 130 is opened, and the compressor 110 draws in the low-temperature, low-pressure gaseous refrigerant, which is then compressed into a high-pressure, high-temperature gaseous refrigerant. This gaseous refrigerant is then sent along the pipeline to the condenser 120. The compressor 110 drives the refrigerant to circulate in the system, providing power for the cooling cycle. The condenser 120 dissipates the high-temperature, high-pressure refrigerant vapor discharged from the compressor 110 into the atmosphere through the radiator 450, causing it to condense into liquid refrigerant. The liquid refrigerant continues along the pipeline through the first electronic expansion valve 130 to the evaporator 140. The evaporator 140 converts the low-temperature, low-pressure liquid refrigerant into a low-temperature, low-pressure gaseous refrigerant, providing a cooling effect for the cab. The gaseous refrigerant continues along the pipeline back to the compressor 110, and this cycle continues to reduce the temperature of the cab.

[0037] like Figure 1 As shown, the thermal management air conditioning system also includes a second electronic expansion valve 210, namely EXV2, a heat exchanger 220, and a second water pump 230, namely Pu2.

[0038] When the battery needs cooling, the second electronic expansion valve 210 is opened. When the refrigerant flows through the heat exchanger 220, it exchanges heat with the cooling water in the heat exchanger 220. At the same time, the second water pump 230 is turned on to circulate water and reduce the battery temperature.

[0039] like Figure 1 As shown, the thermal management air conditioning system also includes a PTC heater 310, a heating module 320, a first water pump 330 (Pu1), and a first water tank 340.

[0040] The heating module 320 and the evaporator 140 are located inside the air conditioning unit.

[0041] When the cab needs heating, the water temperature is adjusted by regulating the power of the PTC heater 310, which increases the water temperature. At the same time, the first water pump 330 is turned on to circulate the water, so that the water in the first water tank 340 flows through the first water pump 330 and the PTC heater 310 to the heating module 320. The heating module 320 uses the cooling circulating water as a heat source and transfers the heat energy to the cab through the air conditioning system to heat the cab.

[0042] like Figure 1 As shown, the thermal management air conditioning system also includes a second water tank 240.

[0043] When the battery needs to be heated, the second electronic expansion valve 210 is disconnected. When the refrigerant flows through the heat exchanger 220, it does not exchange heat with the cooling water in the heat exchanger 220. The second water pump 230 is turned on to circulate water, so that the water in the second water tank 240 flows through the second water pump 230 to the battery box assembly 250 and then back to the second water tank 240. This cycle is repeated to make the battery heat up evenly.

[0044] like Figure 1 As shown, the thermal management air conditioning system also includes a gas-liquid separator 150.

[0045] The gas-liquid separator 150 is used to separate and retain the refrigerant liquid in the return gas pipe to prevent the refrigerant liquid from entering the compressor 110 and causing liquid slugging.

[0046] like Figure 1 As shown, the thermal management air conditioning system also includes a motor unit 410, a third water tank 420, a third water pump 430 (Pu3), a controller 440, and a radiator 450 connected in parallel with the third water tank 420.

[0047] The motor unit 410 includes a chassis drive motor, an upper motor, and an upper motor driver, while the controller 440 can be a multi-functional controller.

[0048] As the operating time of the motor unit 410 and controller 440 increases and the heat generation increases, the fan 460 on the radiator 450 draws in air and accelerates its flow, so that the coolant flowing through the radiator 450 is cooled more quickly, thereby reducing the temperature of the third water tank 420. The third water pump 430 is turned on to promote the circulation of cooling water, thereby reducing the temperature of the cooling water in the entire pipeline. This cycle is repeated to dissipate heat from the motor unit 410 and controller 440. At the same time, the fan 460 dissipates heat from the condenser 120.

[0049] Understandably, the operating modes of this thermal management air conditioning system include single cab cooling mode, single battery cooling mode, dual cooling mode for cab and battery, cab heating and battery cooling mode, cooling and defogging mode, and heating and defogging mode.

[0050] Specifically, the flow direction of refrigerant or cooling water in each pipe of this thermal management air conditioning system can be as follows: Figure 1 As shown by the arrow.

[0051] The thermal management air conditioning system also includes a cab temperature sensor. Figure 1 (not shown in the image) Battery cell temperature sensor ( Figure 1 (Not shown in the image) Heat exchanger outlet temperature sensor 510 (T2), evaporator outlet temperature sensor 520 (optional, T4), evaporator surface temperature sensor 530 (T3), gas-liquid separator inlet temperature sensor 540 (P) T Compressor outlet (exhaust) temperature sensor 550 (T1); condenser outlet pressure sensor 560 (P) H .

[0052] Among them, the gas-liquid separator inlet temperature sensor 540 can be a PT temperature sensor, which can measure the pressure and temperature at its location.

[0053] Exemplary methods

[0054] Please see Figure 2 In one exemplary embodiment, a compressor protection method is provided, applied to, for example... Figure 1 The thermal management air conditioning system shown includes a compressor. Figure 2 As shown, the compressor protection method includes steps S201-S202:

[0055] S201: Monitor the operating data of the thermal management air conditioning system.

[0056] The operating data includes refrigerant high pressure, refrigerant low pressure, compressor exhaust temperature, battery outlet superheat, cab superheat, compressor inlet superheat, evaporator surface temperature, and refrigerant evaporation saturation temperature.

[0057] Specifically, the aforementioned operational data can be determined based on data obtained using sensor detection.

[0058] There is a corresponding relationship between the refrigerant's evaporation saturation temperature and its low-pressure level, which can be stored in tabular form. In other words, the refrigerant's evaporation saturation temperature can be obtained by looking up the table; it is the refrigerant's evaporation saturation temperature corresponding to the monitored low-pressure level.

[0059] use Figure 1 The heat exchanger outlet temperature sensor 510 shown detects the heat exchanger outlet temperature and determines the difference between the heat exchanger outlet temperature and the evaporation saturation temperature as the heat exchanger outlet superheat. The heat exchanger can be a plate heat exchanger or a shell-and-tube heat exchanger, etc. When the heat exchanger is a plate heat exchanger, the heat exchanger outlet superheat can also be called the solar panel outlet superheat.

[0060] The cab temperature is detected by a cab temperature sensor, and the difference between the cab temperature and the evaporation saturation temperature is determined as the cab superheat.

[0061] use Figure 1 The gas-liquid separator inlet temperature sensor 540 detects the compressor inlet temperature at any time, and determines the compressor inlet superheat by the difference between the compressor inlet temperature and the evaporation saturation temperature.

[0062] In addition, the compressor discharge temperature is utilized Figure 1 The exhaust temperature sensor 550 is shown; the low-pressure refrigerant pressure is obtained using... Figure 1 The inlet temperature of the gas-liquid separator shown is detected by sensor 540; the high pressure of the refrigerant is utilized. Figure 1 The condenser outlet pressure is detected by sensor 560; the evaporator surface temperature is obtained using... Figure 1 The evaporator surface temperature sensor 530 shown was detected.

[0063] S202: Based on operating data and in accordance with the air conditioning protection strategy, control the compressor to maintain speed, reduce speed, stop or lock.

[0064] The air conditioning protection strategies include high-pressure protection strategy, low-pressure protection strategy, exhaust temperature protection strategy, anti-icing protection strategy, and overheat protection strategy.

[0065] The high-pressure protection strategy protects the compressor based on the high pressure of the refrigerant; the low-pressure protection strategy protects the compressor based on the low pressure of the refrigerant; the exhaust temperature protection strategy protects the compressor based on the compressor exhaust temperature; the anti-icing protection strategy protects the compressor based on the evaporator surface temperature and the refrigerant evaporation saturation temperature; and the overheat protection strategy protects the compressor based on overheating, including overheating at the battery exchange outlet, overheating in the cab, and overheating at the compressor inlet.

[0066] The measures to protect the compressor include, but are not limited to, speed limiting, stopping, or locking. Speed ​​limiting includes maintaining the speed and reducing the speed. Specifically, maintaining the speed includes maintaining the current speed and (maximum speed) not exceeding a certain preset speed.

[0067] Specifically, if the refrigerant high-pressure pressure is higher than the preset high-pressure pressure, the high-pressure protection strategy is triggered, and based on the refrigerant high-pressure pressure, the compressor is controlled to maintain its speed, reduce its speed, stop, or lock according to the high-pressure protection strategy; if the refrigerant low-pressure pressure is lower than the preset low-pressure pressure, the low-pressure protection strategy is triggered, and based on the refrigerant low-pressure pressure, the compressor is controlled to maintain its speed, reduce its speed, stop, or lock according to the low-pressure protection strategy; if the compressor discharge temperature is higher than the preset discharge temperature, the discharge temperature protection strategy is triggered, and based on the compressor discharge temperature, the compressor is controlled to maintain its speed, reduce its speed, stop, or lock according to the discharge temperature protection strategy; if the evaporator... If the surface temperature is lower than the preset surface temperature and / or the refrigerant evaporation saturation temperature is lower than the preset saturation temperature, the anti-icing protection strategy is triggered. Based on the evaporator surface temperature and / or the refrigerant evaporation saturation temperature, the compressor is controlled to maintain its speed, reduce its speed, stop, or lock according to the anti-icing protection strategy. If the overheating of the battery panel outlet, the overheating of the cab, and / or the overheating of the compressor inlet exceeds the corresponding preset overheating, the overheating protection strategy is triggered. Based on the overheating of the battery panel outlet, the overheating of the cab, and / or the overheating of the compressor inlet, the compressor is controlled to maintain its speed, reduce its speed, stop, or lock according to the overheating protection strategy.

[0068] Of course, the air conditioning system protection strategy also indicates the exit of the currently triggered protection strategy and the restoration of normal compressor regulation. Normal compressor regulation generally means controlling the compressor's operation according to the cooling regulation strategy of the thermal management air conditioning system. This cooling regulation strategy is the regulation strategy employed by the thermal management air conditioning system before it triggers the high-pressure protection strategy.

[0069] For example, after triggering and following the high-pressure protection strategy to control the compressor to maintain speed, reduce speed, stop, or lock, it is determined whether the refrigerant high-pressure has returned to normal. If not, the high-pressure protection strategy continues to be followed to control the compressor to maintain speed, reduce speed, stop, or lock; if yes, the high-pressure protection strategy is exited, and the compressor is controlled to operate according to the refrigeration regulation strategy.

[0070] In this embodiment, by monitoring the operating data of the thermal management system, and based on the operating data, according to the air conditioning system protection strategy, the compressor in the thermal management air conditioning system is controlled to maintain its speed, reduce its speed, stop, or lock. In order to take different protective measures in a timely manner when the thermal management air conditioning system is malfunctioning, based on the operating data and according to the air conditioning system protection strategy, that is, to control the compressor to maintain its speed, reduce its speed, stop, or lock, thereby realizing the protection of the compressor in the thermal management air conditioning system in a hierarchical and different operating conditions, and avoiding losses caused by direct compressor shutdown.

[0071] In some embodiments, for high-pressure protection strategies, operating data includes refrigerant high-pressure.

[0072] Based on operational data and in accordance with the air conditioning system protection strategy, when controlling the compressor to maintain speed, reduce speed, stop, or lock, the compressor speed is controlled based on the relationship between the refrigerant high pressure and the preset high pressure.

[0073] The preset high-pressure includes a first preset high-pressure, a second preset high-pressure, and a third preset high-pressure. The first preset high-pressure is lower than the second preset high-pressure, and the second preset high-pressure is lower than the third preset high-pressure.

[0074] If the refrigerant high-pressure pressure is higher than the first preset high-pressure pressure but lower than the second preset high-pressure pressure, the compressor will be controlled to maintain its current speed. In this case, the operating data will also include the compressor speed.

[0075] If the refrigerant high-pressure pressure is higher than the second preset high-pressure pressure but lower than the third preset high-pressure pressure, and remains so for a first preset duration, then the maximum speed of the compressor is controlled to be the first preset speed. For example, the first preset duration is 5 seconds. For example, the first preset speed is 3000 rpm.

[0076] If the refrigerant high-pressure pressure is higher than the third preset high-pressure pressure and remains higher for a second preset duration, the compressor will be stopped. Furthermore, if the number of compressor stops within a preset lockout duration exceeds a preset number of stops, the compressor will be locked. For example, the second preset duration is 2 seconds. Alternatively, the preset lockout duration is 10 minutes, and the preset number of stops is 3. That is, if the compressor stops more than 3 times within 10 minutes, the compressor will be locked. Of course, if the number of compressor stops does not exceed 3 times within 10 minutes, the compressor will not be locked.

[0077] The compressor can automatically restart after it stops, but it cannot automatically restart after it is locked.

[0078] Accordingly, after the compressor is stopped, if the number of times the compressor stops within the preset lockout period does not exceed the preset number of stops, no operation is required.

[0079] In other words, when the compressor is stopped, the shutdown time is recorded.

[0080] Correspondingly, if the refrigerant high pressure is not higher than the first preset high pressure, the high pressure protection strategy will not be triggered, that is, the compressor will be controlled to work according to the refrigeration regulation strategy.

[0081] In this embodiment, based on whether the refrigerant high-pressure pressure is higher than a preset high-pressure pressure, when the refrigerant high-pressure pressure is a first preset high-pressure pressure but lower than a second preset high-pressure pressure, the compressor is controlled to maintain its current speed. When the duration of the refrigerant high-pressure pressure being a second preset high-pressure pressure but lower than a third preset high-pressure pressure reaches a first preset duration, the compressor's maximum speed is controlled to be the first preset speed. When the duration of the refrigerant high-pressure pressure being a third preset high-pressure pressure reaches a second preset duration, the compressor is controlled to stop. Furthermore, when the number of times the compressor stops within a preset lockout duration exceeds a preset number of stops, the compressor is locked. In this way, based on the refrigerant high-pressure pressure exceeding different preset high-pressure pressures, the compressor can be buffered and protected in stages as the refrigerant high-pressure pressure increases, controlling the compressor to maintain its speed, reduce its speed, stop, or even lock, thereby effectively protecting the compressor and preventing losses caused by direct compressor shutdown.

[0082] In some embodiments, after the high-pressure protection strategy is triggered, the refrigerant high-pressure pressure continues to be monitored, and it is determined whether to exit the high-pressure protection strategy and restore normal cooling. Under normal cooling conditions, the compressor can be controlled to work according to the corresponding cooling regulation strategy.

[0083] After maintaining the compressor at its current speed or controlling the compressor's maximum speed to a first preset speed, if the refrigerant high-pressure pressure is lower than the first preset high-pressure pressure and remains lower for a third preset duration, normal cooling is restored, and the compressor operates according to the cooling regulation strategy of the normal cooling mode. The normal cooling mode is the operating mode of the thermal management air conditioning system when it resumes normal cooling. For example, the third preset duration is 15 seconds.

[0084] After the compressor is stopped, if the refrigerant high-pressure pressure is lower than the first preset high-pressure pressure and remains lower for a third preset duration, and the interval between the compressor's previous start-up time and the current time exceeds a preset time interval, then the compressor is controlled to operate according to the refrigeration regulation strategy. For example, the preset time interval is 30 seconds.

[0085] In other words, the start-up time of the compressor needs to be recorded when it is turned on.

[0086] In this way, once the refrigerant high pressure returns to normal, the high pressure protection strategy can be promptly deactivated, and an appropriate refrigeration regulation strategy can be adopted to control the compressor's operation, thereby achieving normal refrigeration.

[0087] For example, the procedure for high-voltage protection according to the high-voltage protection strategy can be as follows: Figure 3 As shown, there are three cases: refrigerant high pressure 1.9 MPa ≤ P H When the pressure is ≤2.0 MPa, the compressor speed is maintained and no further speed increase is implemented; that is, the compressor speed is limited to its current speed. Afterwards, the refrigerant high-pressure P... H When the pressure is <1.9 MPa and remains so for 15 seconds, the compressor speed is restored to normal adjustment, i.e., the compressor is controlled according to the refrigeration regulation strategy described above; refrigerant high pressure 2.0 MPa < P H After the pressure remains ≤2.5 MPa for 5 seconds, the maximum compressor speed is controlled to 3000 rpm, thus limiting the maximum compressor speed to 3000 rpm; refrigerant high pressure P H After the pressure exceeds 2.5 MPa for 2 seconds, cooling will stop, i.e., the compressor will be shut down. If the compressor stops 3 times within 10 minutes, the compressor will be locked, preventing it from starting again.

[0088] like Figure 3 As shown, after controlling the compressor to maintain its speed or controlling the compressor's maximum speed to 3000 rpm, if the refrigerant high pressure P H If the pressure is <1.9 MPa for 15 seconds, then normal adjustment should be resumed; after the compressor is stopped, if the refrigerant high pressure P H If the pressure is less than 1.9 MPa for 15 seconds and the time interval between two startups is greater than 60 seconds, then the compressor will resume normal speed regulation, or in other words, the cooling will resume.

[0089] In some embodiments, for a low-pressure protection strategy, the operating data includes refrigerant low-pressure.

[0090] Based on operational data and in accordance with the air conditioning system protection strategy, when controlling the compressor to maintain speed, reduce speed, stop, or lock, the compressor speed is controlled based on the relationship between the low-pressure refrigerant and the preset low-pressure.

[0091] The preset low pressure includes a first preset low pressure and a second preset low pressure. The first preset low pressure is lower than the second preset low pressure.

[0092] If the refrigerant low pressure is lower than the first preset low pressure, the compressor will be shut down.

[0093] If the refrigerant low-pressure is higher than the first preset low-pressure but lower than the second preset low-pressure, and remains so for a fourth preset duration, the compressor will be shut down. For example, the fourth preset duration is 20 seconds.

[0094] After the compressor stops, if the number of times the compressor stops within a preset lockout period exceeds a preset number of stops, the compressor will be locked. For example, the preset lockout period is 10 minutes and the preset number of stops is 3.

[0095] Correspondingly, if the number of times the compressor stops within the preset lockout period does not exceed the preset number of stops, no operation will be performed.

[0096] In other words, when controlling the compressor to stop, the compressor's shutdown time is also recorded.

[0097] In addition, if the refrigerant low pressure is not lower than the second preset low pressure, the low pressure protection strategy will not be triggered, that is, the compressor will be controlled to work according to the refrigeration regulation strategy.

[0098] In this embodiment, based on whether the refrigerant low pressure is lower than a preset low pressure, the compressor is controlled to stop when the refrigerant low pressure is lower than the first preset low pressure. When the refrigerant low pressure is higher than the first preset low pressure but lower than the second preset low pressure for a duration of a fourth preset duration, the compressor is controlled to stop. In this way, the compressor can be stopped in a buffered manner according to the needs under different circumstances. The compressor can be buffered and protected in stages according to the change of refrigerant low pressure, and the compressor can be controlled to maintain speed, reduce speed, stop or lock, effectively realizing compressor protection and avoiding losses caused by direct compressor shutdown.

[0099] In some embodiments, after the low-pressure protection strategy is triggered, the refrigerant high-pressure pressure continues to be monitored, and it is determined whether to exit the low-pressure protection strategy and restore normal cooling / normal speed regulation. Under normal cooling conditions, the compressor can be controlled to work according to the corresponding cooling regulation strategy.

[0100] After the compressor is stopped, if the refrigerant low-pressure pressure is higher than the third preset low-pressure pressure and remains higher for a fifth preset duration, the compressor will be controlled to operate according to the refrigeration regulation strategy. For example, the fifth preset duration is 15 seconds.

[0101] Alternatively, after the compressor is stopped, if the refrigerant low pressure is higher than the third preset low pressure and remains higher for the fifth preset duration, and the time interval between the compressor's two start-ups (i.e., the time interval between the compressor's previous start-up time and the current time) exceeds the preset time interval, then the compressor is controlled to start and the compressor's normal speed regulation is restored, i.e., the compressor is controlled to work according to the refrigeration regulation strategy.

[0102] The compressor's previous start-up time is the start-up time with the smallest time interval between the compressor's start-up time and the current time. Additionally, the third preset low-pressure is higher than the second preset low-pressure.

[0103] In other words, the compressor's start-up time is also recorded when the compressor is turned on.

[0104] In this way, once the refrigerant low pressure returns to normal, the low pressure protection strategy can be promptly deactivated, and an appropriate refrigeration regulation strategy can be adopted to control the compressor's operation, thereby achieving normal refrigeration.

[0105] For example, the procedure for low-voltage protection according to the low-voltage protection strategy can be as follows: Figure 4 As shown, there are two situations: refrigerant low pressure P L When the refrigerant pressure is <0.1 MPa, the compressor should be shut down; when the refrigerant low pressure is 0.1 MPa ≤ P L After the pressure is ≤0.15Mpa for 20 seconds, the compressor will be shut down.

[0106] like Figure 4 As shown, if the compressor stops three times within 10 minutes after being controlled to stop, the compressor will be locked, meaning it will no longer be allowed to start. Additionally, if the refrigerant low pressure P... L >0.3Mpa, last for 15s, and the time interval between two start-ups ΔT>30s, then the compressor will resume normal speed regulation.

[0107] In some embodiments, for the exhaust temperature protection strategy, the operating data includes the compressor exhaust temperature.

[0108] Based on operational data and in accordance with the air conditioning system protection strategy, when controlling the compressor to maintain speed, reduce speed, stop, or lock, the compressor's speed is controlled based on the relationship between the compressor's discharge temperature and the preset discharge temperature.

[0109] If the compressor discharge temperature is higher than the preset discharge temperature and remains higher for a sixth preset time, and the compressor speed is lower than the second preset speed, then the compressor will be shut down.

[0110] If the compressor discharge temperature is higher than the preset discharge temperature and remains higher for a sixth preset duration, and the compressor speed is higher than the second preset speed, then the compressor speed is controlled to decrease until the compressor discharge temperature is higher than the preset discharge temperature and remains higher for a sixth preset duration again, and the compressor speed is lower than the second preset speed, then the compressor is controlled to stop.

[0111] For example, the sixth preset duration is 20 seconds, and the second preset rotation speed is 5000 rpm.

[0112] In other words, if the compressor discharge temperature is higher than the preset discharge temperature for 20 seconds and the compressor speed is less than 5000 rpm, the compressor will be shut down.

[0113] If the compressor discharge temperature is higher than the preset discharge temperature for 20 seconds and the compressor speed is greater than 5000 rpm, the compressor speed will be reduced by 500 rpm. If, after the compressor discharge temperature remains higher than the preset discharge temperature for 20 seconds, the compressor speed is still greater than 5000 rpm after the speed is reduced by 500 rpm, the compressor speed will be further reduced, for example, by 500 rpm. If, after the compressor discharge temperature remains higher than the preset discharge temperature for 20 seconds, the compressor speed is less than 5000 rpm after the speed is reduced by 500 rpm, the compressor will be shut down.

[0114] Depending on the specific needs, after the compressor is stopped, it can also be locked based on whether the number of times the compressor stops within a preset lockout period exceeds a preset number of stops. That is, after the compressor is stopped, if the number of times the compressor stops within the preset lockout period exceeds the preset number of stops, the compressor is locked; otherwise, if the number of times the compressor stops within the preset lockout period does not exceed the preset number of stops, no operation is performed.

[0115] Accordingly, when the compressor is stopped, the shutdown time is also recorded.

[0116] In this embodiment, based on whether the compressor discharge temperature is higher than a preset discharge temperature, if the compressor discharge temperature remains higher than the preset discharge temperature for a duration of a sixth preset duration and the compressor speed is lower than a second preset speed, the compressor is controlled to stop. If the compressor discharge temperature remains higher than the preset discharge temperature for a duration of a sixth preset duration and the compressor speed is lower than a second preset speed, the compressor speed is controlled to decrease until the compressor discharge temperature remains higher than the preset discharge temperature for a duration of a sixth preset duration and the compressor speed is lower than a second preset speed, at which point the compressor is controlled to stop. In this way, based on whether the compressor discharge temperature exceeds the preset discharge temperature and whether the compressor speed exceeds the second preset speed, the compressor can be buffered and protected in stages. First, the compressor speed is controlled to decrease, and then the compressor is controlled to stop when the compressor speed decreases, thereby achieving compressor protection and avoiding damage caused by a sudden and direct shutdown of the compressor.

[0117] In some embodiments, the compressor is controlled to stop, and after a seventh preset time, the compressor is controlled to restart, and the compressor discharge temperature is re-evaluated to determine whether it is higher than the preset discharge temperature. For example, the seventh preset time is 60 seconds.

[0118] Specifically, after the compressor is stopped and a seventh preset time period has elapsed, the compressor is restarted. After restarting, the compressor continues to be protected according to the discharge temperature protection strategy, based on the compressor discharge temperature and compressor speed. This involves controlling the compressor to maintain its speed, reduce its speed, stop, or lock the compressor. For details on the specific implementation of controlling the compressor to maintain its speed, reduce its speed, stop, or lock the compressor according to the discharge temperature protection strategy, please refer to the above description, which will not be repeated here.

[0119] In this way, after the compressor is shut down for protection, it can be detected in time that the thermal management air conditioning system where the compressor is located can operate normally, that is, the operating parameters have returned to normal, thereby restoring the normal operation of the thermal management air conditioning system in a timely manner and improving the user experience of the thermal management air conditioning system.

[0120] In some embodiments, after the exhaust temperature protection strategy is triggered, the exhaust temperature and compressor speed are continuously monitored, and it is determined whether to exit the exhaust temperature protection strategy and restore the normal speed regulation of the compressor for normal cooling. Under normal cooling, the compressor can be controlled to work according to the corresponding cooling regulation strategy.

[0121] If the compressor discharge temperature is lower than the preset discharge temperature and remains so for the eighth preset duration, the compressor will be controlled to operate according to the refrigeration regulation strategy.

[0122] Since the exhaust temperature takes a relatively long time to drop to the normal range, the eighth preset duration is generally much longer than the sixth and seventh preset durations. For example, the eighth preset duration is 15 minutes.

[0123] Correspondingly, if the compressor discharge temperature is higher than the preset discharge temperature, the compressor speed can be reduced or stopped in the manner described above, thereby ensuring the safe operation of the compressor and avoiding losses.

[0124] In this way, once the compressor discharge temperature drops to the preset discharge temperature, that is, after the compressor discharge temperature returns to normal, the discharge temperature protection strategy can be promptly exited, and a cooling regulation strategy corresponding to the working mode of the thermal management air conditioning system can be adopted to control the compressor operation and achieve normal cooling of the compressor.

[0125] For example, the process of performing exhaust temperature protection according to the compressor exhaust temperature protection strategy can be as follows: Figure 5 As shown, there are two cases: if the compressor discharge temperature T D If the temperature is ≥125℃ and the duration reaches 20s, then the compressor speed R is checked to see if it meets the requirement of R < 5000rpm. If it does, the compressor is stopped; otherwise, the compressor speed is reduced by 500rpm, and the compressor discharge temperature is checked to see if it meets the requirement of T. D Monitoring should be conducted at ≥125℃; if the compressor discharge temperature T D If the temperature is below 125℃ and remains so for 15 minutes, the exhaust temperature protection strategy will be deactivated, and the compressor will resume normal speed regulation.

[0126] like Figure 5 As shown, after the compressor is stopped for 60 seconds, it is restarted, and the compressor discharge temperature is checked again to see if it meets the T standard. D Monitoring should be conducted at ≥125℃.

[0127] In some embodiments, for anti-icing protection strategies, operating data includes evaporator surface temperature and refrigerant evaporation saturation temperature.

[0128] Based on operational data and in accordance with the air conditioning system protection strategy, when controlling the compressor to maintain speed, reduce speed, stop or lock, based on the evaporator surface temperature or based on the evaporator surface temperature and the refrigerant evaporation saturation temperature, in accordance with the anti-icing protection strategy, the compressor is controlled to maintain speed, reduce speed, stop or lock.

[0129] Specifically, the compressor speed is controlled to be maintained, reduced, or stopped based on the evaporator surface temperature and the preset surface temperature.

[0130] If the evaporator surface temperature is lower than the first preset surface temperature, the maximum speed of the compressor is controlled to be the third preset speed.

[0131] There is a correlation between the evaporator surface temperature and the compressor's maximum speed, which can be stored in a table. Therefore, the third preset speed can be determined by looking up the table based on the evaporator surface temperature, and is the compressor's maximum speed corresponding to the evaporator surface temperature in the table.

[0132] After controlling the compressor's maximum speed to the third preset speed, if the evaporator surface temperature is lower than the second preset surface temperature, the compressor is controlled to operate at the fourth preset speed. If the evaporator surface temperature remains lower than the second preset surface temperature for more than a ninth preset time, the compressor is controlled to stop. The third preset speed is greater than the fourth preset speed. Additionally, the first preset surface temperature is higher than the second preset surface temperature.

[0133] Generally, the fourth preset speed is the compressor's minimum speed.

[0134] When the evaporator surface temperature remains below the second preset surface temperature for more than the ninth preset time, and the compressor is stopped, the length of the ninth preset time varies depending on whether the thermal management air conditioning system activates defrosting.

[0135] Generally, the duration of the ninth preset time when the thermal management air conditioning system starts defrosting is longer than the duration of the ninth preset time when the thermal management air conditioning system stops defrosting (i.e., defrosting is turned off).

[0136] For example, the ninth preset duration when the thermal management air conditioning system starts defrosting is 90 seconds, and the ninth preset duration when the thermal management air conditioning system does not start defrosting is 30 seconds. That is, when the thermal management air conditioning system starts defrosting, if the evaporator surface temperature is lower than the second preset surface temperature for more than 90 seconds, the compressor is controlled to stop; when the thermal management air conditioning system does not start defrosting, if the evaporator surface temperature is lower than the second preset surface temperature for more than 30 seconds, the compressor is controlled to stop.

[0137] Alternatively, specifically, the compressor speed can be controlled to maintain, reduce, or stop based on the evaporator surface temperature, evaporation saturation temperature, temperature difference, preset saturation temperature, and preset temperature difference. The temperature difference is the difference between the evaporator surface temperature and the evaporation saturation temperature, and the preset temperature difference is a pre-defined temperature difference determined based on actual operating conditions.

[0138] Generally, this temperature difference is positive.

[0139] At this time, if the evaporation saturation temperature is lower than the first preset saturation temperature, the maximum speed of the compressor is controlled to be the fifth preset speed.

[0140] There is a corresponding relationship between the evaporation saturation temperature and the compressor's maximum speed, and this relationship can be stored in the form of a table. Therefore, the fifth preset speed can be determined by looking up the table based on the evaporation saturation temperature, and is the maximum speed of the compressor corresponding to the evaporation saturation temperature in the table.

[0141] After controlling the compressor's maximum speed to the fifth preset speed, if the evaporation saturation temperature is lower than the second preset saturation temperature and the temperature difference is less than a preset temperature difference, the compressor is controlled to operate at the sixth preset speed. If the duration for which the evaporation saturation temperature is lower than the second preset saturation temperature and the temperature difference is less than the preset temperature difference exceeds the tenth preset duration, the compressor is controlled to stop. The fifth preset speed is greater than the sixth preset speed. Additionally, the first preset saturation temperature is higher than the second preset saturation temperature.

[0142] Generally, the sixth preset speed is set to the compressor's minimum speed.

[0143] Similarly, when the evaporator surface temperature is lower than the second preset surface temperature and the temperature difference is less than the preset temperature difference, and the time exceeds the tenth preset time, the length of the tenth preset time varies depending on whether the thermal management air conditioning system starts defrosting.

[0144] Generally, the tenth preset time when the thermal management air conditioning system starts defrosting is longer than the tenth preset time when the thermal management air conditioning system stops defrosting (i.e., defrosting is turned off).

[0145] For example, the tenth preset duration when the thermal management air conditioning system starts defrosting is 90 seconds, and the tenth preset duration when the thermal management air conditioning system does not start defrosting is 30 seconds.

[0146] In this embodiment, when the evaporator surface temperature is lower than the first preset surface temperature, the maximum speed of the compressor is controlled to be the third preset speed. When the evaporator surface temperature is lower than the second preset surface temperature, the compressor is controlled to operate at the fourth preset speed, i.e., the minimum speed. And when the duration for which the evaporator surface temperature is lower than the second preset surface temperature exceeds the ninth preset duration, the compressor is controlled to stop. In this way, based on the degree and duration of the evaporator surface temperature exceeding the preset surface temperature, the compressor can be controlled to first maintain its speed, then reduce its speed, and then stop or even lock, thereby protecting the compressor in a hierarchical, phased, and condition-specific manner to avoid losses caused by sudden shutdown.

[0147] In some embodiments, after the anti-icing protection strategy is triggered, the evaporator surface temperature and the refrigerant evaporation saturation temperature are continuously monitored. Based on the monitored evaporator surface temperature and refrigerant evaporation saturation temperature, it is determined whether to exit the anti-icing protection strategy and restore normal speed regulation. In normal cooling mode, the compressor can be controlled to work according to the corresponding speed cooling regulation strategy.

[0148] If, after the compressor has been stopped and an eleventh preset time has elapsed, the evaporator surface temperature is higher than a third preset surface temperature, the compressor will be restarted and its normal speed regulation will be restored. The compressor will then operate according to the refrigeration regulation strategy of the corresponding refrigeration mode. For example, the eleventh preset time is 30 seconds.

[0149] The third preset surface temperature is higher than the first preset surface temperature.

[0150] Alternatively, to better protect the compressor, if the evaporator surface temperature exceeds the third preset surface temperature after the compressor has been stopped for an eleventh preset time, the compressor can be restarted and operated at a seventh preset speed for a twelfth preset time before resuming normal speed regulation. For example, the twelfth preset time is 30 seconds.

[0151] In this way, after taking protective measures for the compressor, such as maintaining the speed, reducing the speed, stopping or locking it, so that the evaporator surface temperature and evaporation saturation temperature in the thermal management air conditioning system return to normal, the anti-icing protection strategy can be promptly withdrawn, and an appropriate refrigeration regulation strategy can be adopted to control the compressor's operation and achieve normal refrigeration of the thermal management air conditioning system.

[0152] For example, the process of protecting the compressor from icing according to the anti-icing protection strategy can be as follows: Figure 6 As shown, there are four cases: evaporator surface temperature T b1 When the temperature is ≤5℃, the compressor is controlled to operate at a limited speed by referring to Table 1. After that, the evaporator surface temperature T b1 When the temperature is ≤2℃, the compressor is controlled to run at its lowest speed. At this time, if defrosting is turned on, the evaporator surface temperature T will be... b1 If the temperature remains ≤2℃ for 90 seconds, the compressor will stop, thus ceasing cooling. If defrosting is not activated, the temperature will be maintained at the evaporator surface temperature T. b1 Cooling is stopped when the temperature remains ≤2℃ for 30 seconds; evaporation saturation temperature T b2 When the temperature is ≤0℃, the compressor is controlled to operate at a limited speed by referring to Table 2. Afterwards, the evaporation saturation temperature T... b2 ≤-3℃ and evaporator surface temperature T b1 With T b2 If the temperature difference ΔT is less than the preset temperature difference ΔT' (i.e., ΔT < ΔT'), the compressor is controlled to run at its lowest speed. At this time, if defrosting is activated, the temperature will be at the evaporation saturation temperature T. b2 When the temperature difference ≤ -3℃ and the duration of the temperature difference △T < △T' reaches 90s, cooling will stop. If defrosting is not activated, cooling will continue at the evaporation saturation temperature T. b2Cooling stops when the temperature difference ≤ -3℃ and the duration of the temperature difference ΔT < ΔT' reaches 30 seconds. Table 1 stores the correspondence between evaporator surface temperature and compressor maximum speed, and Table 2 stores the correspondence between evaporation saturation temperature and compressor maximum speed.

[0153] like Figure 6 As shown, after the compressor is stopped and 30 seconds have elapsed, if the evaporator surface temperature T... b1 If the temperature exceeds 6℃, the compressor will start and run at its lowest speed for 30 seconds. After that, the compressor's main speed regulation strategy will be restored, that is, the compressor's normal speed regulation will be restored.

[0154] Alternatively, after the compressor starts, the normal speed regulation of the compressor can be restored directly.

[0155] In some embodiments, for overheat protection strategies, operating data includes overheating at the battery exchange outlet, overheating in the cab, and overheating at the compressor inlet.

[0156] Based on operational data and in accordance with the air conditioning system protection strategy, when controlling the compressor to maintain speed, reduce speed, stop or lock, the compressor is controlled to stop or lock based on the relationship between the superheat of the solar panel outlet, the superheat of the cab, and the superheat of the compressor inlet and the corresponding preset superheat.

[0157] The preset overheating includes a first preset overheating, a second preset overheating, and a third preset overheating. The first preset overheating corresponds to the overheating at the battery panel outlet, the second preset overheating corresponds to the overheating at the cab, and the third preset overheating corresponds to the overheating at the compressor inlet.

[0158] If the overheating at the solar panel outlet is lower than the corresponding first preset overheating level and remains below it for a thirteenth preset duration, the compressor will be stopped. Furthermore, if the number of times the compressor stops within a preset lockout duration exceeds a preset number of stops, the compressor will be locked. For example, the thirteenth preset duration is 20 seconds.

[0159] If the superheat level in the cab is lower than the corresponding second preset superheat level and remains so for a fourteenth preset duration, the compressor will be shut down. For example, the fourteenth preset duration is 60 seconds.

[0160] If, when the thermal management air conditioning system is in single-battery cooling mode, the compressor inlet superheat is lower than the third preset superheat and remains below the fifteenth preset duration, the compressor will be shut down. Furthermore, if the number of compressor shutdowns within a preset lockout duration exceeds a preset number of shutdowns, the compressor will be locked. For example, the fifteenth preset duration is 20 seconds.

[0161] If, when the thermal management air conditioning system is not in single-battery cooling mode, the compressor inlet superheat is lower than the third preset superheat and remains below the sixteenth preset duration, the compressor will be shut down. The fifteenth preset duration is longer than the sixteenth preset duration. For example, the sixteenth preset duration is 60 seconds.

[0162] Correspondingly, if the superheat of the battery pack outlet is higher than the first preset superheat, the superheat of the cab is higher than the second preset superheat, and the superheat of the compressor inlet is higher than the third preset superheat, then there is no operation and the compressor is not controlled to stop.

[0163] Specifically, if the superheat at the battery exchange outlet is higher than the first preset superheat, it can be replaced by the fact that the duration for which the superheat at the battery exchange outlet is lower than the first preset superheat does not exceed the thirteenth preset duration; if the superheat in the cab is higher than the second preset superheat, it can be replaced by the fact that the duration for which the superheat in the cab is lower than the second preset superheat does not exceed the fourteenth preset duration; if the thermal management air conditioning system is in single-battery cooling mode, and the superheat at the compressor inlet is higher than the third preset superheat, it can be replaced by the fact that the duration for which the superheat at the compressor inlet is lower than the third preset superheat does not exceed the fifteenth preset duration; if the thermal management air conditioning system is not in single-battery cooling mode, and the superheat at the compressor inlet is higher than the third preset superheat, it can be replaced by the fact that the duration for which the superheat at the compressor inlet is lower than the third preset superheat exceeds the sixteenth preset duration.

[0164] Specifically, the compressor is stopped but not locked based on the overheating of the cab. When the thermal management air conditioning system is not in single-battery cooling mode, the compressor is stopped but not locked based on the overheating of the compressor inlet.

[0165] In this embodiment, when the superheat at the battery panel outlet is lower than the first preset superheat for a thirteenth preset duration, the compressor is controlled to stop. Furthermore, when the number of times the compressor stops within a preset lock duration exceeds a preset number of stops, the compressor is locked. When the superheat in the cab is lower than the second preset duration for a fourteenth preset duration, the compressor is controlled to stop. When the thermal management air conditioning system is in single-battery cooling mode, when the superheat at the compressor inlet is lower than the third preset superheat for a fifteenth preset duration, the compressor is controlled to stop. Furthermore, when the number of times the compressor stops within a preset lock duration exceeds a preset number of stops, the compressor is locked. When the thermal management air conditioning system is not in single-battery cooling mode, when the superheat at the compressor inlet is lower than the third preset superheat for a sixteenth preset duration, the compressor is controlled to stop. In this way, based on the overheating of the solar panel outlet, the cab, the compressor inlet, and the operating mode of the thermal management air conditioning system, the compressor can be controlled to stop or even be locked, thus protecting the compressor in a hierarchical and condition-specific manner and effectively protecting the compressor.

[0166] In some embodiments, after the overheat protection strategy is triggered, the overheat of the thermal management air conditioning system continues to be monitored, including the overheat of the battery exchange outlet, the overheat of the cab, and the overheat of the compressor inlet, and it is determined whether to exit the overheat protection strategy and restore normal cooling. Under normal cooling, the compressor can be controlled to work according to the corresponding cooling regulation strategy.

[0167] After the compressor is stopped based on the superheat of the heat exchanger outlet and a seventeenth preset time has elapsed, or after the compressor is stopped based on the superheat of the compressor inlet in single-battery cooling mode and a seventeenth preset time has elapsed, if the battery inlet water temperature is higher than the preset inlet water temperature, the compressor will resume normal speed regulation. For example, the seventeenth preset time is 30 seconds.

[0168] When not in single-battery cooling mode, the compressor is stopped based on the superheat of the compressor inlet and restarted after an eighteenth preset time. For example, the eighteenth preset time is 30 seconds.

[0169] If, after the compressor is shut down based on the superheat of the cab and a nineteenth preset time has elapsed, the evaporator surface temperature exceeds a fourth preset surface temperature, the compressor is restarted and operated according to the normal refrigeration regulation strategy. For example, the nineteenth preset time is 30 seconds.

[0170] In this way, once the superheat in each part of the thermal management air conditioning system returns to normal, the superheat protection strategy can be promptly deactivated, and the corresponding cooling regulation strategy can be adopted to control the compressor's operation, thereby achieving normal cooling and ensuring a good user experience.

[0171] For example, the process of performing overheat protection according to the overheat protection strategy can be as follows: Figure 7 As shown, there are four scenarios: When the superheat ΔT1 at the solar panel outlet (refrigerant) is ≤1℃ and lasts for 20 seconds, a protection mechanism is activated to shut down the compressor. If the compressor shuts down more than 3 times within 10 minutes, it is locked, meaning battery cooling is no longer allowed. Alternatively, if the compressor shuts down and 30 seconds later, the battery inlet water temperature T... j If the temperature exceeds 23℃, the compressor's normal speed regulation will be restored, i.e., the compressor's main speed regulation strategy will be restored. When the thermal management air conditioning system is in single-battery cooling mode, if the compressor inlet superheat ΔT2 ≤ 1℃ and lasts for 20 seconds, the compressor will be shut down for protection. If the number of shutdowns exceeds 3 within 10 minutes, the compressor will be locked, meaning battery cooling will no longer be allowed, or the compressor will be shut down and, after 30 seconds, the battery inlet water temperature T will be... jIf the temperature exceeds 23℃, the compressor's normal speed regulation is restored, i.e., the compressor's main speed regulation strategy is restored. When the thermal management air conditioning system is not in single-battery cooling mode, if the compressor inlet superheat ΔT2 ≤ 1℃ and lasts for 60 seconds, the compressor is controlled to shut down for protection, but not locked. After 30 seconds, the compressor is restarted. When the cab superheat ΔT3 ≤ 1℃ and lasts for 60 seconds, the compressor is controlled to shut down for protection. After shutdown and 30 seconds, if the evaporator surface temperature T... b1 If the temperature is greater than 6℃, the compressor will be turned on and will operate according to the normal speed regulation strategy.

[0172] Exemplary device

[0173] like Figure 8 As shown in the figure, this application embodiment also provides a compressor protection device, including a monitoring module 801 and a control module 802.

[0174] in,

[0175] Monitoring module 801 is used to monitor the operating data of the thermal management air conditioning system;

[0176] The control module 802 is used to control the compressor to maintain its speed, reduce its speed, stop, or lock it based on the operating data and in accordance with the air conditioning system protection strategy.

[0177] The compressor protection device provided in this embodiment belongs to the same concept as the compressor protection method provided in the above embodiments of this application. It can execute the method provided in any of the above embodiments of this application and has the corresponding functional modules and beneficial effects. Technical details not described in detail in this embodiment can be found in the specific processing content of the compressor protection method provided in the above embodiments of this application, and will not be repeated here.

[0178] The functions implemented by the monitoring module 801 and the control module 802 can be implemented by the same or different processors calling software, and this application embodiment does not limit this.

[0179] Exemplary electronic devices

[0180] Another embodiment of this application also provides an electronic device, see [link to relevant documentation] Figure 9 As shown, the electronic device includes a memory 900 and a processor 910.

[0181] The memory 900 is connected to the processor 910 and is used to store programs;

[0182] The processor 910 is used to implement the compressor protection method disclosed in any of the above embodiments by running the program stored in the memory 900.

[0183] Specifically, the electronic device may also include: a bus, a communication interface 920, an input device 930, and an output device 940.

[0184] The processor 910, memory 900, communication interface 920, input device 930, and output device 940 are interconnected via a bus. Among them:

[0185] A bus can include a pathway for transmitting information between various components of a computer system.

[0186] The processor 910 can be a general-purpose processor, such as a general-purpose central processing unit (CPU), a microprocessor, etc., or an application-specific integrated circuit (ASIC), or one or more integrated circuits used to control the execution of the program of the present application. It can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0187] The processor 910 may include a main processor, as well as a baseband chip, modem, etc.

[0188] The memory 900 stores a program for executing the technical solution of this application, and may also store an operating system and other critical business functions. Specifically, the program may include program code, which includes computer operation instructions. More specifically, the memory 900 may include read-only memory (ROM), other types of static storage devices capable of storing static information and instructions, random access memory (RAM), other types of dynamic storage devices capable of storing information and instructions, disk storage, flash memory, etc.

[0189] Input device 930 may include a device for receiving user input data and information, such as a keyboard, mouse, camera, scanner, light pen, voice input device, touch screen, pedometer, or gravity sensor.

[0190] Output device 940 may include devices that allow information to be output to a user, such as a display screen, printer, speaker, etc.

[0191] The communication interface 920 may include a device that uses any transceiver to communicate with other devices or communication networks, such as Ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), etc.

[0192] The processor 910 executes the program stored in the memory 900 and calls other devices, which can be used to implement the various steps of any of the compressor protection methods provided in the above embodiments of this application.

[0193] Those skilled in the art will understand that Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0194] This application also proposes a chip including a processor and a data interface. The processor reads and runs a program stored in a memory through the data interface to execute the compressor protection method described in any of the above embodiments. For details of the processing and its beneficial effects, please refer to the above embodiments of the compressor protection method.

[0195] This application also provides a vehicle equipped with the aforementioned compressor protection device or the aforementioned electronic device.

[0196] In addition to the methods and devices described above, embodiments of this application provide a computer program product comprising computer program instructions that, when executed by a processor, cause the processor to perform the steps of the compressor protection method according to various embodiments of this application as described in the "Exemplary Methods" section of this specification.

[0197] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0198] Furthermore, embodiments of this application also propose a storage medium having a computer program stored thereon, the computer program being executed by a processor of the steps in the compressor protection method according to various embodiments of this application described in the "Exemplary Methods" section above.

[0199] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0200] The block diagrams of devices, apparatuses, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0201] It should also be noted that in the apparatus, device, and method of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of the present invention.

[0202] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0203] It should be understood that the qualifying terms "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present invention are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of the present invention.

[0204] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A method of protecting a compressor, characterized by, The method is applied to a thermal management air conditioning system comprising the compressor, and the method comprises: monitoring operation data of the thermal management air conditioning system, the operation data comprising a high-pressure refrigerant pressure and a low-pressure refrigerant pressure; controlling the compressor to keep a speed, reduce the speed, stop or lock according to an air conditioning system protection strategy based on the operation data; the air conditioning system protection strategy comprises a high-pressure protection strategy and a low-pressure protection strategy, the high-pressure protection strategy is that if the high-pressure refrigerant pressure is higher than a first preset high-pressure pressure and lower than a second preset high-pressure pressure, the compressor is controlled to keep a current speed; if the high-pressure refrigerant pressure is higher than the second preset high-pressure pressure and lower than a third preset high-pressure pressure and lasts for a first preset time length, the maximum speed of the compressor is controlled to be a first preset speed; if the high-pressure refrigerant pressure is higher than the third preset high-pressure pressure and lasts for a second preset time length, the compressor is controlled to stop, and when the number of times of stopping of the compressor within a preset locking time length exceeds a preset stopping number of times, the compressor is controlled to lock; the low-pressure protection strategy is that if the low-pressure refrigerant pressure is lower than a first preset low-pressure pressure, the compressor is controlled to stop; if the low-pressure refrigerant pressure is higher than the first preset low-pressure pressure and lower than a second preset low-pressure pressure and lasts for a fourth preset time length, the compressor is controlled to stop; after the compressor stops, when the number of times of stopping of the compressor within a preset locking time length exceeds a preset stopping number of times, the compressor is controlled to lock.

2. The compressor protection method according to claim 1, wherein the operation data further comprises a compressor exhaust temperature, a battery panel outlet superheat, a cab superheat, a compressor inlet superheat, an evaporator surface temperature and an evaporation saturation temperature of refrigerant; the air conditioning system protection strategy further comprises an exhaust temperature protection strategy, an anti-icing protection strategy and a superheat protection strategy.

3. The compressor protection method of claim 2, wherein, controlling the compressor to keep a speed, reduce the speed, stop or lock according to an air conditioning system protection strategy based on the operation data comprises: if the compressor exhaust temperature is higher than a preset exhaust temperature and lasts for a sixth preset time length, and the speed of the compressor is less than a second preset speed, the compressor is controlled to stop; if the compressor exhaust temperature is higher than the preset exhaust temperature and lasts for the sixth preset time length, and the speed of the compressor is greater than the second preset speed, the speed of the compressor is reduced until the compressor exhaust temperature is higher than the preset exhaust temperature and lasts for the sixth preset time length, and the speed of the compressor is less than the second preset speed, the compressor is controlled to stop.

4. The compressor protection method of claim 2, wherein, controlling the compressor to keep a speed, reduce the speed, stop or lock according to an air conditioning system protection strategy based on the operation data comprises: if the evaporator surface temperature is lower than a first preset surface temperature, the maximum speed of the compressor is controlled to be a third preset speed; If the evaporator surface temperature is lower than a second preset surface temperature after the maximum rotating speed of the compressor is controlled to be a third preset rotating speed, the compressor is controlled to work at a fourth preset rotating speed, and if the evaporator surface temperature is lower than the second preset surface temperature for more than a ninth preset time length, the compressor is controlled to stop working, and the third preset rotating speed is greater than the fourth preset rotating speed; If the evaporating saturation temperature is lower than a first preset saturation temperature, the maximum rotating speed of the compressor is controlled to be a fifth preset rotating speed; If the evaporating saturation temperature is lower than a second preset saturation temperature and a temperature difference value is less than a preset temperature difference value after the maximum rotating speed of the compressor is controlled to be the fifth preset rotating speed, the compressor is controlled to work at a sixth preset rotating speed, and if the evaporating saturation temperature is lower than the second preset saturation temperature and the temperature difference value is less than the preset temperature difference value for more than a tenth preset time length, the compressor is controlled to stop working, the fifth preset rotating speed is greater than the sixth preset rotating speed, and the temperature difference value is a difference value between the evaporator surface temperature and the evaporating saturation temperature.

5. The compressor protection method of claim 2, wherein, The control module is configured to control the compressor to keep rotating, reduce rotating speed, stop working or lock according to an air conditioning system protection strategy based on the operation data, and the air conditioning system protection strategy includes a high-pressure protection strategy and a low-pressure protection strategy. If the battery panel outlet superheat degree is lower than a first preset superheat degree and lasts for a thirteenth preset time length, the compressor is controlled to stop working, and if the number of times of stopping working of the compressor in a preset locking time length exceeds a preset stopping number of times, the compressor is controlled to lock; If the cab superheat degree is lower than a second preset superheat degree and lasts for a fourteenth preset time length, the compressor is controlled to stop working; If the compressor air inlet superheat degree is lower than a third preset superheat degree and lasts for a fifteenth preset time length when the thermal management air conditioning system is in a single-battery refrigeration mode, the compressor is controlled to stop working, and if the number of times of stopping working of the compressor in a preset locking time length exceeds a preset stopping number of times, the compressor is controlled to lock; If the compressor air inlet superheat degree is lower than the third preset superheat degree and lasts for a sixteenth preset time length when the thermal management air conditioning system is not in the single-battery refrigeration mode, the compressor is controlled to stop working, and the time length of the fifteenth preset time length is greater than the time length of the sixteenth preset time length.

6. A compressor protection device, characterized by The device is applied to a thermal management air conditioning system, and the thermal management air conditioning system includes the compressor. The monitoring module is configured to monitor operation data of the thermal management air conditioning system, and the operation data includes refrigerant high-pressure pressure and refrigerant low-pressure pressure. The control module is configured to control the compressor to keep rotating, reduce rotating speed, stop working or lock according to an air conditioning system protection strategy based on the operation data, and the air conditioning system protection strategy includes a high-pressure protection strategy and a low-pressure protection strategy. The air conditioning system protection strategy includes a high-pressure protection strategy and a low-pressure protection strategy, The high-pressure protection strategy is: if the refrigerant high-pressure pressure is higher than a first preset high-pressure pressure and lower than a second preset high-pressure pressure, the compressor is controlled to keep the current rotating speed; if the refrigerant high-pressure pressure is higher than the second preset high-pressure pressure and lower than a third preset high-pressure pressure, and lasts for a first preset time length, the maximum rotating speed of the compressor is controlled to be a first preset rotating speed; if the refrigerant high-pressure pressure is higher than the third preset high-pressure pressure, and lasts for a second preset time length, the compressor is controlled to stop, and when the number of times of stopping of the compressor within a preset locking time length exceeds a preset stopping number of times, the compressor is controlled to be locked; The low-pressure protection strategy is: if the refrigerant low-pressure pressure is lower than a first preset low-pressure pressure, the compressor is controlled to stop; if the refrigerant low-pressure pressure is higher than the first preset low-pressure pressure and lower than a second preset low-pressure pressure, and lasts for a fourth preset time length, the compressor is controlled to stop; After the compressor stops, when the number of times of stopping of the compressor within a preset locking time length exceeds a preset stopping number of times, the compressor is controlled to be locked.

7. An electronic device, comprising: comprise a memory and a processor; The memory is connected with the processor, and is used for storing programs; The processor is used for realizing the compressor protection method in any one of claims 1 to 5 by running the programs in the memory.

8. A vehicle characterized by comprising: The vehicle is provided with the compressor protection device in claim 6, or the electronic equipment in claim 7.

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