Thermal management air conditioner protection method, device and equipment and vehicle

Abstract

The invention provides a compressor protection method, device and equipment and a vehicle. By monitoring operation data of a heat management system, based on the operation data, according to an air conditioner system protection strategy, a compressor in the heat management air conditioner system is controlled to keep the rotating speed, reduce the rotating speed, stop or lock, so that when the heat management air conditioner system operates abnormally, the compressor in the heat management air conditioner system can be protected. On the basis of the operation data, according to the protection strategy of the air conditioning system, different protection measures are taken in time, namely, the compressor is controlled to keep the rotating speed, reduce the rotating speed, stop or lock, so that the compressor in the thermal management air conditioning system is protected hierarchically and under different working conditions, and losses caused by direct stop of the compressor are avoided.

Description

Technical Field

[0001] The present application relates to the field of air-conditioning technology, and in particular to a compressor protection method, device, equipment and vehicle. Background Art

[0002] The thermal management air conditioning system is an air conditioning system that integrates multiple thermal management technologies. It not only has the cooling, heating and dehumidification functions of traditional air conditioning, but also emphasizes the efficient management and utilization of thermal energy.

[0003] In the prior art, when a thermal management air-conditioning system is in operation, a high and low pressure protection strategy and an anti-icing protection strategy are usually adopted to control the compressor of the thermal management air-conditioning system to shut down in an abnormal situation, so as to achieve protection of the thermal management air-conditioning system, or to achieve protection of the compressor of the thermal management air-conditioning system.

[0004] However, during the actual operation of the thermal management air-conditioning system, various abnormal conditions occur, which are not limited to high or low pressure or icing abnormalities. It is difficult to protect the compressor of the thermal management air-conditioning system when other abnormalities occur. In addition, directly controlling the compressor of the thermal management air-conditioning system to shut down in the event of an abnormality may cause damage to the equipment in the thermal management air-conditioning system or affect the experience of indoor members, thereby reducing the effect of protecting the compressor of the thermal management air-conditioning system. Summary of the invention

[0005] Based on the defects and shortcomings of the above-mentioned prior art, the present application proposes a compressor protection method, device, equipment and vehicle, which can control the compressor to maintain speed, reduce speed, shut down or lock according to the air-conditioning system protection strategy based on the monitored operating data of the thermal management air-conditioning system, thereby realizing hierarchical and operating condition-based protection of the compressor in the thermal management air-conditioning system, and solving the problem that directly controlling the compressor to shut down when the thermal management air-conditioning system is abnormal may cause equipment damage or affect the experience of indoor members, thereby reducing the effect of protecting the compressor.

[0006] According to a first aspect of an embodiment of the present application, a compressor protection method is provided, which is applied to a thermal management air conditioning system, wherein the thermal management air conditioning system includes the compressor, and the method includes:

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

[0008] Based on the operating data and in accordance with an air conditioning system protection strategy, the compressor is controlled to maintain a rotation speed, reduce a rotation speed, shut down, or lock.

[0009] According to a second aspect of an embodiment of the present application, a compressor protection device is provided, which is applied to a thermal management air conditioning system, wherein the thermal management air conditioning system includes the compressor, and the device includes:

[0010] A monitoring module, 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 a rotation speed, reduce a rotation speed, shut down or lock the compressor according to an air conditioning system protection strategy based on the operating data.

[0012] According to a third aspect of an embodiment of the present application, there is provided an electronic device, 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 the program in the memory.

[0015] According to a fourth aspect of an embodiment of the present application, a storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the compressor protection method as described in the first aspect is implemented.

[0016] According to a fifth aspect of an embodiment of the present 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 above-mentioned compressor protection method, device, equipment and vehicle, the operating data of the thermal management system can be monitored, and 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 the speed, reduce the speed, shut down or lock. When the thermal management air-conditioning system operates abnormally, different protection measures can be taken in time based on the operating data and in accordance with the air-conditioning system protection strategy, that is, the compressor can be controlled to maintain the speed, reduce the speed, shut down or lock, thereby realizing the protection of the compressor in the thermal management air-conditioning system in a hierarchical and working condition manner, avoiding losses caused by direct shutdown of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of a feasible application scenario of a compressor protection method provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of a process of a compressor protection method provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of a high voltage protection process provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of a low voltage protection process proposed in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of a process of exhaust temperature protection proposed in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of an anti-icing protection process proposed in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of a process flow of overheat protection proposed in an embodiment of the present application;

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

[0027] Fig. 9 A schematic diagram of the structure of an electronic device proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] Overview

[0030] As described in the background technology, in the prior art, when the thermal management air conditioning system is in operation, a high and low pressure protection strategy and an anti-icing protection strategy are usually adopted to control the compressor of the thermal management air conditioning system to shut down in an abnormality, so as to achieve protection of the thermal management air conditioning system, or to achieve protection of the compressor of the thermal management air conditioning system. However, in the actual operation of the thermal management air conditioning system, there are many abnormal situations, which are not limited to high and low pressure or icing abnormalities. It is difficult to achieve protection of the compressor of the thermal management air conditioning system when other abnormalities occur, and directly controlling the compressor of the thermal management air conditioning system to shut down in an abnormality may cause damage to the equipment in the thermal management air conditioning system or affect the experience of indoor members, reducing the effect of protecting the compressor of the thermal management air conditioning system.

[0031] On this basis, the inventors discovered through further research that by monitoring the operating data of the thermal management system and based on the operating data and in accordance with the air-conditioning system protection strategy, the compressor in the thermal management air-conditioning system is controlled to maintain the speed, reduce the speed, shut down or lock. When the thermal management air-conditioning system operates abnormally, 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, the compressor is controlled to maintain the speed, reduce the speed, shut down or lock, thereby achieving protection for the compressor in the thermal management air-conditioning system in a hierarchical and working condition manner, thereby avoiding losses caused by direct shutdown of the compressor.

[0032] Based on the above concept, an embodiment of the present specification provides a compressor protection method, which will be exemplarily described below in conjunction with the accompanying drawings.

[0033] Example scenarios

[0034] refer to Figure 1 , Figure 1 Schematic diagram of a thermal management air-conditioning system, a feasible application scenario of the compressor protection method.

[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 , namely EXV1 , and an evaporator 140 .

[0036] When the cab needs to be cooled, the first electronic expansion valve 130 is opened, and the compressor 110 sucks in the low-temperature and low-pressure gaseous refrigerant, i.e., the refrigerant, and compresses it into a high-pressure and high-temperature gaseous refrigerant, which is sent to the condenser 120 along the pipeline. The compressor 110 drives the refrigerant to circulate in the system to provide power for the refrigeration cycle. The condenser 120 dissipates the high-temperature and high-pressure refrigerant vapor discharged from the compressor 110 into the atmosphere through the radiator 450, condensing it into liquid refrigerant. The liquid refrigerant continues to pass through the first electronic expansion valve 130 along the pipeline to the evaporator 140. The evaporator 140 converts the low-temperature and low-pressure liquid refrigerant into a low-temperature and low-pressure gaseous refrigerant to provide a cooling effect for the cab. The gaseous refrigerant continues to return to the compressor 110 along the pipeline, and the cycle is repeated in this way to reduce the temperature of the cab.

[0037] like Figure 1 As shown, the thermal management air conditioning system further 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 to be cooled, the second electronic expansion valve 210 is opened, and 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 to reduce the battery temperature.

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

[0040] The heating module 320 and the evaporator 140 are arranged in the air conditioning box.

[0041] When the cab needs to be heated, the water temperature is adjusted by adjusting the power of the PTC heater 310 to increase the water temperature. At the same time, the first water pump 330 is turned on for water circulation, 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 for water circulation, 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 returns to the second water tank 240. This cycle is repeated to heat the battery 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 store the refrigerant liquid in the return gas pipe to prevent the refrigerant liquid from entering the compressor 110 and causing liquid hammer.

[0046] like Figure 1 As shown, the thermal management air conditioning system further includes a motor group 410 , a third water tank 420 , a third water pump 430 , namely Pu3 , a controller 440 , and a radiator 450 arranged in parallel with the third water tank 420 .

[0047] The motor group 410 includes a chassis drive motor, a top motor and a top motor driver, and the controller 440 can be an all-in-one controller.

[0048] As the heat generated by the motor group 410 and the controller 440 increases with the increase in working time, the fan 460 on the radiator 450 inhales 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 to reduce the temperature of the cooling water in the entire pipeline. This cycle is repeated to achieve heat dissipation for the motor group 410 and the controller 440. At the same time, the fan 460 is used to dissipate heat for the condenser 120.

[0049] It is understandable that the operating modes of the thermal management air-conditioning system include single cab cooling mode, single battery cooling mode, cab and battery dual cooling mode, cab heating and battery cooling mode, cooling and demisting mode, heating and demisting mode, etc.

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

[0051] The thermal management air conditioning system also includes a cab temperature sensor ( Figure 1 Not shown), battery cell temperature sensor ( Figure 1 (not shown), the heat exchanger outlet temperature sensor 510 is T 2 , evaporator outlet temperature sensor 520 (optional) i.e. T 4 , evaporator surface temperature sensor 530, namely T 3 , gas-liquid separator inlet temperature sensor 540, namely P T , compressor outlet (exhaust) temperature sensor 550, namely T 1 , condenser outlet pressure sensor 560, namely P H .

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

[0053] Exemplary Methods

[0054] See also Figure 2 In an exemplary embodiment, a compressor protection method is provided, which is applied to Figure 1 In the thermal management air conditioning system shown in FIG. 1 , the thermal management air conditioning system includes a compressor. Figure 2 As shown, the compressor protection method includes steps S201-S202:

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

[0056] Among them, the operating data includes refrigerant high pressure, refrigerant low pressure, compressor exhaust temperature, battery panel exchange outlet superheat, cab superheat, compressor air inlet superheat, evaporator surface temperature and refrigerant evaporation saturation temperature.

[0057] Specifically, the above operating data can be determined based on data detected by sensors.

[0058] There is a corresponding relationship between the evaporation saturation temperature of the refrigerant and the low pressure of the refrigerant, and the corresponding relationship can be stored in a table. That is, the evaporation saturation temperature of the refrigerant can be obtained by looking up the table, which is the evaporation saturation temperature of the refrigerant corresponding to the monitored low pressure of the refrigerant in the table.

[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 battery plate outlet superheat.

[0060] The cab temperature sensor is used to detect the indoor temperature of the cab, and the difference between the indoor temperature of the cab and the evaporation saturation temperature is determined as the cab overheating degree.

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

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

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

[0064] Among them, 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 is a strategy for protecting the compressor based on the high-pressure pressure of the refrigerant; the low-pressure protection strategy is a strategy for protecting the compressor based on the low-pressure pressure of the refrigerant; the exhaust temperature protection strategy is a strategy for protecting the compressor based on the exhaust temperature of the compressor; the anti-icing protection strategy is a strategy for protecting the compressor based on the evaporator surface temperature and the evaporation saturation temperature of the refrigerant; the overheat protection strategy is a strategy for protecting the compressor based on the overheat, including the overheat of the battery panel exchange outlet, the overheat of the cab and the overheat of the compressor inlet.

[0066] Among them, the measures for protecting the compressor include but are not limited to speed limiting, shutdown or locking, and speed limiting includes maintaining the speed, reducing the speed, etc. Specifically, maintaining the speed includes maintaining the current speed, (maximum speed) not exceeding a certain preset speed, etc.

[0067] Specifically, if the high-pressure refrigerant pressure is higher than the preset high-pressure pressure, the high-pressure protection strategy is triggered, and based on the high-pressure refrigerant pressure, in accordance with the high-pressure protection strategy, the compressor is controlled to maintain the speed, reduce the speed, shut down or lock; if the low-pressure refrigerant pressure is lower than the preset low-pressure pressure, the low-pressure protection strategy is triggered, and based on the low-pressure refrigerant pressure, in accordance with the low-pressure protection strategy, the compressor is controlled to maintain the speed, reduce the speed, shut down or lock; if the compressor exhaust temperature is higher than the preset exhaust temperature, the exhaust temperature protection strategy is triggered, and based on the compressor exhaust temperature, in accordance with the exhaust temperature protection strategy, the compressor is controlled to maintain the speed, reduce the speed, shut down or lock; if the evaporator If the surface temperature is lower than the preset surface temperature and / or the evaporation saturation temperature of the refrigerant is lower than the preset saturation temperature, the anti-icing protection strategy is triggered. Based on the evaporator surface temperature and / or the evaporation saturation temperature of the refrigerant, the compressor is controlled to maintain the speed, reduce the speed, shut down or lock according to the anti-icing protection strategy; if the overheat of the battery panel exchange outlet, the overheat of the cab and / or the overheat of the compressor air inlet exceeds the corresponding preset superheat, the overheat protection strategy is triggered. Based on the overheat of the battery panel exchange outlet, the overheat of the cab and / or the overheat of the compressor air inlet, the compressor is controlled to maintain the speed, reduce the speed, shut down or lock according to the overheat protection strategy.

[0068] Of course, the air conditioning system protection strategy also indicates to exit the currently triggered protection strategy and restore the normal adjustment of the compressor. In general, the normal adjustment of the compressor is to control the compressor to work according to the refrigeration adjustment strategy of the thermal management air conditioning system. Among them, the refrigeration adjustment strategy is the adjustment strategy adopted by the thermal management air conditioning system before it triggers the high pressure protection strategy.

[0069] For example, after the high-pressure protection strategy is triggered and the compressor is controlled to maintain the speed, reduce the speed, shut down or lock, it is determined whether the high-pressure pressure of the refrigerant has returned to normal. If not, the high-pressure protection strategy is continued to be used to control the compressor to maintain the speed, reduce the speed, shut down or lock; if so, the high-pressure protection strategy is exited and the compressor is controlled to work according to the refrigeration adjustment strategy.

[0070] In this embodiment, by monitoring the operating data of the thermal management system, based on the operating data and in accordance with the air-conditioning system protection strategy, the compressor in the thermal management air-conditioning system is controlled to maintain the speed, reduce the speed, shut down or lock. When the thermal management air-conditioning system operates abnormally, different protection measures are taken in time based on the operating data and in accordance with the air-conditioning system protection strategy, that is, the compressor is controlled to maintain the speed, reduce the speed, shut down or lock, thereby realizing the protection of the compressor in the thermal management air-conditioning system in a hierarchical and working condition manner, avoiding losses caused by direct shutdown of the compressor.

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

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

[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 is higher than the first preset high pressure and lower than the second preset high pressure, the compressor is controlled to maintain the current speed. At this time, the operation data also includes the compressor speed.

[0075] If the refrigerant high pressure is higher than the second preset high pressure and lower than the third preset high pressure, and lasts for a first preset time, the maximum speed of the compressor is controlled to be the first preset speed. For example, the first preset time is 5s. For example, the first preset speed is 3000rpm.

[0076] If the refrigerant high pressure is higher than the third preset high pressure and lasts for the second preset time, the compressor is controlled to shut down, and when the number of shutdowns of the compressor within the preset lock time exceeds the preset number of shutdowns, the compressor is controlled to lock. Exemplarily, the second preset time is 2s. Exemplarily, the preset lock time is 10 minutes, and the preset number of shutdowns is 3 times, that is, the number of shutdowns of the compressor within 10 minutes exceeds 3 times, the compressor is controlled to lock. Of course, if the number of shutdowns of the compressor within 10 minutes does not exceed 3 times, the compressor is not controlled to lock.

[0077] Among them, the compressor can automatically start after stopping, and cannot automatically start after being locked.

[0078] Accordingly, after the compressor is controlled to stop, if the number of times the compressor is stopped within the preset locking time does not exceed the preset number of times of stopping, no operation is performed.

[0079] That is, when the compressor is controlled to stop, the stop time of the compressor is recorded.

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

[0081] In this embodiment, based on whether the refrigerant high pressure pressure is higher than the preset high pressure pressure, when the refrigerant high pressure pressure is the first preset high pressure pressure but lower than the second preset high pressure pressure, the compressor is controlled to maintain the current speed, and when the duration of the refrigerant high pressure pressure being the second preset high pressure pressure but lower than the third preset high pressure pressure reaches the first preset duration, the maximum speed of the compressor is controlled to be the first preset speed, and when the duration of the refrigerant high pressure pressure being the third preset high pressure pressure reaches the second preset duration, the compressor is controlled to shut down, and when the number of shutdowns of the compressor within the preset locking time exceeds the preset number of shutdowns, the compressor is controlled to lock. In this way, based on the situation where the refrigerant high pressure pressure exceeds different preset high pressure pressures, as the refrigerant high pressure pressure increases, the compressor can be buffered and protected in stages, and the compressor can be controlled to maintain the speed, reduce the speed, shut down or even lock, thereby effectively realizing the compressor protection and avoiding the loss caused by the direct shutdown of the compressor.

[0082] In some embodiments, after the high-pressure protection strategy is triggered, the refrigerant high-pressure pressure continues to be monitored, and a determination is made as to whether to exit the high-pressure protection strategy and resume normal refrigeration. Under normal refrigeration, the compressor operation can be controlled according to the corresponding refrigeration adjustment strategy.

[0083] After controlling the compressor to maintain the current speed, or controlling the maximum speed of the compressor to be the first preset speed, if the refrigerant high pressure pressure is lower than the first preset high pressure pressure and lasts for a third preset time, normal refrigeration is restored, and the compressor is controlled to work according to the refrigeration adjustment strategy in the normal refrigeration mode. The normal refrigeration mode is the working mode when the thermal management air conditioning system resumes normal refrigeration. Exemplarily, the third preset time is 15s.

[0084] After the compressor is controlled to stop, if the refrigerant high pressure is lower than the first preset high pressure and lasts for a third preset time, and the interval between the last startup time of the compressor and the current time exceeds the preset time interval, the compressor is controlled to work according to the refrigeration adjustment strategy. For example, the preset time interval is 30s.

[0085] That is to say, when the compressor is turned on, the startup time of the compressor needs to be recorded.

[0086] In this way, after the high-pressure pressure of the refrigerant returns to normal, the high-pressure protection strategy can be exited in time, and an appropriate refrigeration adjustment strategy can be used to control the operation of the compressor to achieve normal refrigeration of the compressor.

[0087] For example, the process of performing high voltage protection according to the high voltage protection strategy can be as follows: Figure 3 As shown, there are three situations: refrigerant high pressure 1.9Mpa≤P H When the refrigerant pressure is less than 2.0Mpa, the compressor is controlled to maintain the speed and no longer increase the speed, that is, the speed of the compressor is limited to the current speed of the compressor. After that, the refrigerant high pressure P H <1.9Mpa and lasts for 15s, the normal speed regulation of the compressor is restored, that is, the compressor is controlled to work according to the above refrigeration regulation strategy; the refrigerant high pressure pressure 2.0Mpa<P H ≤2.5Mpa for 5s, the maximum speed of the compressor is controlled to 3000rpm, that is, the maximum speed of the compressor is limited to 3000rpm; the refrigerant high pressure P H >2.5Mpa for 2s, the refrigeration stops, that is, the compressor is controlled to shut down. At this time, if the machine shuts down 3 times within 10 minutes, the machine will be locked, that is, the compressor is controlled to be locked and no longer allowed to start.

[0088] like Figure 3 As shown, after controlling the compressor to maintain the speed or controlling the maximum speed of the compressor to 3000rpm, if the refrigerant high pressure P H <1.9Mpa for 15s, then resume normal regulation; after the compressor is shut down, if the refrigerant high pressure P H If the pressure is less than 1.9Mpa for 15s and the time interval between two starts △T is greater than 60s, the compressor is restored to normal speed regulation, or refrigeration is restored.

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

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

[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 is controlled to stop.

[0093] If the refrigerant low pressure is higher than the first preset low pressure and lower than the second preset low pressure, and lasts for a fourth preset time, the compressor is controlled to stop. Exemplarily, the fourth preset time is 20 seconds.

[0094] After the compressor is stopped, if the compressor stops more than the preset number of times within the preset lock time, the compressor is controlled to lock. For example, the preset lock time is 10 minutes and the preset number of times is 3.

[0095] Accordingly, if the number of compressor shutdowns within the preset locking time does not exceed the preset number of shutdowns, no operation is performed.

[0096] That is, when the compressor is controlled to stop, the stop time of the compressor 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 adjustment strategy.

[0098] In this embodiment, based on whether the refrigerant low pressure is lower than the preset low pressure, when the refrigerant low pressure is lower than the first preset low pressure, the compressor is controlled to shut down; when the duration of the refrigerant low pressure being higher than the first preset low pressure but lower than the second preset low pressure reaches a fourth preset duration, the compressor is controlled to shut down. In this way, under different circumstances, the compressor shutdown is controlled according to demand buffering, and the compressor can be buffered and protected in stages as the refrigerant low pressure changes. The compressor can be controlled to maintain the speed, reduce the speed, shut down or lock, thereby effectively protecting the compressor and avoiding losses caused by direct shutdown of the compressor.

[0099] In some embodiments, after the low-pressure protection strategy is triggered, the refrigerant high-pressure pressure continues to be monitored, and a determination is made as to whether to exit the low-pressure protection strategy and resume normal refrigeration / normal speed regulation. Under normal refrigeration, the compressor can be controlled according to the corresponding refrigeration regulation strategy.

[0100] After the compressor is controlled to stop, if the refrigerant low pressure is higher than the third preset low pressure and lasts for a fifth preset time, the compressor is controlled to work according to the refrigeration adjustment strategy. Exemplarily, the fifth preset time is 15 seconds.

[0101] Alternatively, after controlling the compressor to stop, if the refrigerant low pressure is higher than the third preset low pressure and lasts for the fifth preset time period, and the time interval between two startups of the compressor, that is, the time interval between the last startup time of the compressor and the current time exceeds the preset time interval, the compressor is controlled to start and the normal speed regulation of the compressor is restored, that is, the compressor is controlled to operate according to the refrigeration regulation strategy.

[0102] The last startup time of the compressor is the startup time of the compressor before the current time and with the shortest time interval with the current time. In addition, the third preset low pressure is higher than the second preset low pressure.

[0103] That is, when the compressor is turned on, the startup time of the compressor is also recorded.

[0104] In this way, after the low pressure of the refrigerant returns to normal, the low pressure protection strategy can be exited in time, and an appropriate refrigeration adjustment strategy can be adopted to control the operation of the compressor to achieve normal refrigeration of the compressor.

[0105] For example, the process of performing 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 low pressure is 0.1Mpa≤P L When the pressure is ≤0.15Mpa for 20s, the compressor will be shut down.

[0106] like Figure 4 As shown in the figure, after the compressor is controlled to stop, if it stops three times within 10 minutes, the machine will be locked, that is, the compressor is locked and the compressor is no longer allowed to start. In addition, after the compressor is controlled to stop, if the refrigerant low pressure P L >0.3Mpa, lasts for 15s, and the time interval between two starts △T>30s, the compressor is restored to normal speed regulation.

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

[0108] Based on the operating data and in accordance with the air-conditioning system protection strategy, the compressor is controlled to maintain the speed, reduce the speed, stop or lock. Based on the relationship between the compressor exhaust temperature and the preset exhaust temperature, the compressor is controlled to maintain the speed, reduce the speed, stop or lock.

[0109] If the compressor exhaust temperature is higher than the preset exhaust temperature and lasts for a sixth preset time period, and the compressor speed is less than the second preset speed, the compressor is controlled to shut down.

[0110] If the compressor exhaust temperature is higher than the preset exhaust temperature and continues for the sixth preset time period, and the compressor speed is greater than the second preset speed, the compressor is controlled to reduce the speed until the compressor exhaust temperature is higher than the preset exhaust temperature and continues for the sixth preset time period again, and the compressor speed is less than the second preset speed, then the compressor is controlled to stop.

[0111] Exemplarily, the sixth preset time length is 20 seconds, and the second preset rotation speed is 5000 rpm.

[0112] That is to say, if the compressor exhaust temperature is higher than the preset exhaust temperature for 20 seconds and the compressor speed is less than 5000 rpm, the compressor is controlled to shut down.

[0113] If the compressor exhaust temperature is higher than the preset exhaust temperature for 20s and the compressor speed is greater than 5000rpm, the compressor is controlled to reduce the speed by 500rpm. Afterwards, if the compressor exhaust temperature is higher than the preset exhaust temperature for 20s, the compressor speed after reducing the speed by 500rpm is still greater than 5000rpm, the compressor is controlled to further reduce the speed, for example, by reducing the speed by 500rpm; if the compressor exhaust temperature is higher than the preset exhaust temperature for 20s, the compressor speed after reducing the speed by 500rpm is less than 5000rpm, the compressor is controlled to stop.

[0114] Based on different actual needs, after the compressor is controlled to stop, whether the compressor is locked can also be controlled based on whether the number of stops of the compressor within the preset locking time exceeds the preset number of stops. That is, after the compressor is controlled to stop, if the number of stops of the compressor within the preset locking time exceeds the preset number of stops, the compressor is controlled to be locked; otherwise, that is, the number of stops of the compressor within the preset locking time does not exceed the preset number of stops, no operation is performed.

[0115] Correspondingly, when the compressor is controlled to stop, the stop time of the compressor is also recorded.

[0116] In this embodiment, based on whether the compressor exhaust temperature is higher than the preset exhaust temperature, when the duration of the compressor exhaust temperature being higher than the preset exhaust temperature reaches the sixth preset duration and the compressor speed is less than the second preset speed, the compressor is controlled to shut down; when the duration of the compressor exhaust temperature being higher than the preset exhaust temperature reaches the sixth preset duration and the compressor speed is less than the second preset speed, the compressor is controlled to reduce the speed until the duration of the compressor exhaust temperature being higher than the preset exhaust temperature reaches the sixth preset duration and the compressor speed is less than the second preset speed, the compressor is controlled to shut down. In this way, based on whether the compressor exhaust temperature exceeds the preset exhaust temperature and whether the compressor speed exceeds the second preset speed, the compressor can be buffered and protected in stages, first controlling the compressor to reduce the speed, and then controlling the compressor to shut down when the compressor speed is reduced, thereby achieving compressor protection and avoiding losses caused by sudden and direct shutdown of the compressor.

[0117] In some embodiments, the compressor is controlled to stop, and after a seventh preset time period, the compressor is controlled to restart, and it is re-determined whether the compressor exhaust temperature is higher than the preset exhaust temperature. Exemplarily, the seventh preset time period is 60 seconds.

[0118] Specifically, the compressor is controlled to stop and after the seventh preset time has passed, the compressor is controlled to restart. After the compressor restarts, the compressor is continuously protected based on the compressor exhaust temperature and the compressor speed according to the exhaust temperature protection strategy, that is, the compressor is controlled to maintain the speed, reduce the speed, shut down or lock. Among them, the specific implementation of controlling the compressor to maintain the speed, reduce the speed, shut down or lock according to the exhaust temperature protection strategy based on the compressor exhaust temperature and the compressor speed can be referred to the above introduction, 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 return to normal, thereby promptly restoring the normal operation of the thermal management air-conditioning system 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 the compressor speed continue to be monitored, and a determination is made as to whether to exit the exhaust temperature protection strategy, and restore normal compressor speed regulation for normal refrigeration. Under normal refrigeration, the compressor operation can be controlled according to the corresponding refrigeration regulation strategy.

[0121] If the compressor exhaust temperature is lower than the preset exhaust temperature and lasts for an eighth preset time period, the compressor is controlled to operate according to the refrigeration regulation strategy.

[0122] Among them, since it takes a long time for the exhaust temperature to drop to the normal range, in general, the eighth preset time is much longer than the sixth preset time and the seventh preset time. Exemplarily, the eighth preset time is 15 minutes.

[0123] Correspondingly, if the exhaust temperature of the compressor is higher than the preset exhaust temperature, the compressor can be controlled to reduce the speed or shut down in the above manner, thereby ensuring the safety of the compressor operation and avoiding losses.

[0124] In this way, when the compressor exhaust temperature drops to the preset exhaust temperature, that is, after the compressor exhaust temperature returns to normal, the exhaust temperature protection strategy can be exited in time, and the refrigeration adjustment strategy corresponding to the working mode of the thermal management air-conditioning system can be adopted to control the operation of the compressor and achieve normal refrigeration 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 exhaust temperature T D ≥125℃, and the duration reaches 20s, the compressor speed R is judged whether it meets R<5000rpm. If so, the compressor is controlled to stop. If not, the compressor speed is controlled to decrease by 500rpm and then the compressor exhaust temperature is judged whether it meets T D ≥125℃ for monitoring; if the compressor exhaust temperature T D If the temperature is lower than 125℃ and lasts for 15 minutes, the exhaust temperature protection strategy will be exited and the compressor will be controlled to resume normal speed regulation.

[0126] like Figure 5 As shown, after the compressor is stopped for 60 seconds, it is started and the compressor exhaust temperature is re-checked to see if it meets T D Monitor at ≥125℃.

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

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

[0129] Specifically, based on the evaporator surface temperature and the preset surface temperature, the compressor is controlled to maintain the speed, reduce the speed or stop.

[0130] At this time, if the surface temperature of the evaporator 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 corresponding relationship between the evaporator surface temperature and the maximum speed of the compressor, and the corresponding relationship can be stored in the form of a table. Therefore, the third preset speed can be determined by looking up the table based on the evaporator surface temperature, which is the maximum speed of the compressor corresponding to the evaporator surface temperature in the table.

[0132] After the maximum speed of the compressor is controlled to be 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, and when the duration of the evaporator surface temperature being lower than the second preset surface temperature exceeds the ninth preset duration, the compressor is controlled to stop, wherein the third preset speed is greater than the fourth preset speed. In addition, the first preset surface temperature is higher than the second preset surface temperature.

[0133] Generally, the fourth preset speed is the lowest speed of the compressor.

[0134] When the duration of the evaporator surface temperature being lower than the second preset surface temperature exceeds the ninth preset duration and the compressor is controlled to stop, the length of the ninth preset duration may be different depending on whether the thermal management air conditioning system turns on defrosting.

[0135] Generally, the ninth preset time length when the thermal management air conditioning system turns on defrosting is longer than the ninth preset time length when the thermal management air conditioning system does not turn on defrosting, ie, turns off defrosting.

[0136] For example, the ninth preset time when the thermal management air conditioning system starts defrosting is 90 seconds, and the ninth preset time 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] Or, specifically, based on the evaporator surface temperature, the evaporation saturation temperature, the temperature difference, the preset saturation temperature and the preset temperature difference, the compressor is controlled to maintain the speed, reduce the speed or shut down. The temperature difference is the difference between the evaporator surface temperature and the evaporation saturation temperature, and the preset temperature difference is the preset temperature difference determined based on the actual working conditions.

[0138] Typically, the 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 maximum speed of the compressor, and the corresponding 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, which is the maximum speed of the compressor corresponding to the evaporation saturation temperature in the table.

[0141] After the maximum speed of the compressor is controlled to be the fifth preset speed, if the evaporation saturation temperature is lower than the second preset saturation temperature and the temperature difference is less than the preset temperature difference, the compressor is controlled to work at the sixth preset speed, and when the evaporation saturation temperature is lower than the second preset saturation temperature and the temperature difference is less than the preset temperature difference for a period of time exceeding the tenth preset time, the compressor is controlled to stop. The fifth preset speed is greater than the sixth preset speed. In addition, the first preset saturation temperature is higher than the second preset saturation temperature.

[0142] Generally, the sixth preset speed is set as the lowest speed of the compressor.

[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 for more than the tenth preset time period, when the compressor is controlled to stop, the length of the tenth preset time period is different based on whether the thermal management air-conditioning system turns on defrost.

[0144] Generally, the tenth preset time length when the thermal management air conditioning system turns on defrosting is longer than the tenth preset time length when the thermal management air conditioning system does not turn on defrosting, ie, turns off defrosting.

[0145] Exemplarily, the tenth preset time length when the thermal management air conditioning system turns on defrosting is 90 seconds, and the tenth preset time length when the thermal management air conditioning system does not turn on 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, and when the evaporator surface temperature is lower than the second preset surface temperature, the compressor is controlled to work at the fourth preset speed, i.e., the lowest speed, and when the evaporator surface temperature is lower than the second preset surface temperature for a duration exceeding 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 the speed, reduce the speed, and then stop or even lock, thereby protecting the compressor in different levels, stages, and working conditions 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 evaporation saturation temperature of the refrigerant continue to be monitored. Based on the monitored evaporator surface temperature and the evaporation saturation temperature of the refrigerant, it is determined whether to exit the anti-icing protection strategy and restore normal speed regulation. In normal refrigeration mode, the compressor can be controlled according to the corresponding speed refrigeration regulation strategy.

[0148] After the compressor is controlled to stop and the eleventh preset time has passed, if the evaporator surface temperature is greater than the third preset surface temperature, the compressor is controlled to start, and the normal speed regulation of the compressor is restored, and the compressor is controlled to work according to the refrigeration regulation strategy in the corresponding refrigeration mode. Exemplarily, the eleventh preset time is 30s.

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

[0150] Alternatively, in order to better protect the compressor, after the compressor is stopped and the eleventh preset time has passed, if the evaporator surface temperature is greater than the third preset surface temperature, the compressor is started, and the compressor is controlled to work at the seventh preset speed for the twelfth preset time, and then the compressor is controlled to resume normal speed regulation. For example, the twelfth preset time is 30 seconds.

[0151] In this way, after taking protective measures for the compressor, i.e. maintaining the speed, reducing the speed, shutting down or locking the compressor, so that the evaporator surface temperature and the evaporation saturation temperature in the thermal management air-conditioning system return to normal, the anti-icing protection strategy can be exited in time, and an appropriate refrigeration adjustment strategy can be adopted to control the operation of the compressor and achieve normal refrigeration of the thermal management air-conditioning system.

[0152] For example, the process of performing anti-icing protection on the compressor according to the anti-icing protection strategy can be as follows: Figure 6 As shown, there are four cases: evaporator surface temperature T b1 ≤5℃, the compressor is controlled to run at limited speed by looking up Table 1. After that, the evaporator surface temperature T b1 ≤2℃, the compressor is controlled to run at its lowest speed. At this time, if the defrost is turned on, the evaporator surface temperature T b1 When the temperature is less than 2℃ for 90s, the compressor is controlled to stop, that is, the refrigeration is stopped. If the defrost is not turned on, the evaporator surface temperature T b1 When the temperature is ≤2℃ for 30s, stop cooling; the evaporation saturation temperature T b2 ≤0℃, the compressor is controlled to run at limited speed by looking up Table 2. After that, the evaporation saturation temperature T b2 ≤-3℃ and evaporator surface temperature T b1 With T b2 The temperature difference △T is less than the preset temperature difference △T', that is, △T<△T', and the compressor is controlled to run at its lowest speed. At this time, if the defrost is turned on, at the evaporation saturation temperature T b2 When the temperature difference △T<△T' lasts for 90s, stop cooling. If defrosting is not turned on, the evaporation saturation temperature T b2≤-3℃ and the temperature difference △T<△T' lasts for 30s, the refrigeration is stopped. Table 1 stores the corresponding relationship between the evaporator surface temperature and the maximum speed of the compressor, and Table 2 stores the corresponding relationship between the evaporation saturation temperature and the maximum speed of the compressor.

[0153] like Figure 6 As shown, after the compressor is stopped and 30 seconds have passed, if the evaporator surface temperature T b1 >6℃, the compressor is controlled to start and run at its lowest speed for 30s, after which the main speed regulation strategy of the compressor is restored, that is, the normal speed regulation of the compressor is restored.

[0154] Alternatively, after the compressor is controlled to start, the normal speed regulation of the compressor can be directly restored.

[0155] In some embodiments, for the overheat protection strategy, the operating data includes the overheat of the solar panel exchange port, the overheat of the cab, and the overheat of the compressor inlet.

[0156] Based on the operating data and in accordance with the air conditioning system protection strategy, the compressor is controlled to maintain the speed, reduce the speed, shut down or lock. Based on the relationship between the overheat of the battery panel exchange outlet, the overheat of the cab and the superheat of the compressor inlet and the corresponding preset superheat, the compressor is controlled to shut down or lock.

[0157] The preset superheat includes a first preset superheat, a second preset superheat and a third preset superheat. The first preset superheat corresponds to the superheat of the battery panel exchange port, the second preset superheat corresponds to the superheat of the cab, and the third preset superheat corresponds to the superheat of the compressor inlet.

[0158] If the superheat degree of the solar panel exchange outlet is lower than the corresponding first preset superheat degree and lasts for a thirteenth preset time, the compressor is controlled to stop, and when the number of stops of the compressor during the preset lock time exceeds the preset number of stops, the compressor is controlled to lock. For example, the thirteenth preset time is 20 seconds.

[0159] If the cab overheating degree is lower than the corresponding second preset overheating degree and lasts for a fourteenth preset time, the compressor is controlled to stop. Exemplarily, the fourteenth preset time is 60 seconds.

[0160] If the compressor air inlet superheat is lower than the third preset superheat and lasts for the fifteenth preset time when the thermal management air conditioning system is in the single battery cooling mode, the compressor is controlled to stop, and when the compressor stops more than the preset number of times during the preset lock time, the compressor is controlled to lock. For example, the fifteenth preset time is 20 seconds.

[0161] If the superheat degree of the compressor air inlet is lower than the third preset superheat degree and lasts for the sixteenth preset time period when the thermal management air conditioning system is not in the single battery cooling mode, the compressor is controlled to shut down, and the length of the fifteenth preset time period is greater than the length of the sixteenth preset time period. For example, the sixteenth preset time period is 60 seconds.

[0162] Accordingly, if the overheat of the solar panel exchange port is higher than the first preset overheat, the overheat of the cab is higher than the second preset overheat, and the overheat of the compressor air inlet is higher than the third preset overheat, no operation is performed and the compressor is not controlled to shut down.

[0163] Among them, if the overheat of the battery panel exchange outlet is higher than the first preset overheat, it can be replaced by the duration of the overheat of the panel exchange outlet being lower than the first preset overheat not exceeding the thirteenth preset time; if the overheat of the cab is higher than the second preset overheat, it can be replaced by the duration of the overheat of the cab being lower than the second preset overheat not exceeding the fourteenth preset time; when the thermal management air-conditioning system is in the single battery cooling mode, the superheat of the compressor air inlet is higher than the third preset overheat, which can be replaced by the duration of the superheat of the compressor air inlet being lower than the third preset overheat not exceeding the fifteenth preset time; when the thermal management air-conditioning system is not in the battery single cooling mode, the superheat of the compressor air inlet is higher than the third preset overheat, which can be replaced by the duration of the superheat of the compressor air inlet being lower than the third preset overheat for more than the sixteenth preset time.

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

[0165] In this embodiment, when the overheat of the battery panel exchange outlet is lower than the first preset overheat and continues for the thirteenth preset time, the compressor is controlled to stop, and when the number of shutdowns of the compressor during the preset locking time exceeds the preset number of shutdowns, the compressor is controlled to lock; when the overheat of the cab is lower than the second preset time and continues for the fourteenth preset time, the compressor is controlled to stop; when the thermal management air-conditioning system is in the single battery cooling mode, when the superheat of the compressor air inlet is lower than the third preset overheat and continues for the fifteenth preset time, the compressor is controlled to stop, and when the number of shutdowns of the compressor during the preset locking time exceeds the preset number of shutdowns, the compressor is controlled to lock; when the thermal management air-conditioning system is not in the single battery cooling mode, when the superheat of the compressor air inlet is lower than the third preset superheat and continues for the sixteenth preset time, the compressor is controlled to stop. In this way, the compressor can be controlled to shut down or even locked based on the overheat of the battery panel exchange outlet, the overheat of the cab, the overheat of the compressor air inlet and the working mode of the thermal management air conditioning system. The compressor can be protected in different levels and working conditions, and the compressor can be controlled to shut down or lock, thereby 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 panel exchange outlet, the overheat of the cab, and the overheat of the compressor air inlet, and a judgment is made as to whether to exit the overheat protection strategy and resume normal cooling. Under normal cooling, the compressor operation can be controlled according to the corresponding cooling adjustment strategy.

[0167] After the compressor is stopped based on the plate exchange outlet superheat and the seventeenth preset time has passed, or after the compressor is stopped based on the compressor inlet superheat and the seventeenth preset time has passed in the single battery cooling mode, if the battery inlet water temperature is higher than the preset inlet water temperature, the compressor is controlled to resume normal speed regulation. Exemplarily, the seventeenth preset time is 30s.

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

[0169] After the compressor is shut down based on the cab overheating and the nineteenth preset time has passed, if the evaporator surface temperature exceeds the fourth preset surface temperature, the compressor is turned on and the compressor is controlled to work according to the normal refrigeration adjustment strategy. Exemplarily, the nineteenth preset time is 30 seconds.

[0170] In this way, after the superheat of each part of the thermal management air-conditioning system returns to normal, the overheat protection strategy can be exited in time, and the corresponding refrigeration adjustment strategy can be used to control the operation of the compressor to achieve normal refrigeration of the compressor and ensure 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 situations: when the solar panel changes the outlet (refrigerant) overheating degree △T 1 ≤1℃ and lasts for 20s, the protection occurs and the compressor is controlled to stop for protection. If the number of shutdowns exceeds 3 times within 10 minutes, the compressor is controlled to lock, that is, the battery cooling is no longer allowed to start, or after shutdown for 30s, the battery water inlet temperature T j >23℃, the normal speed regulation of the compressor is restored, that is, the main speed regulation strategy of the compressor is restored; when the thermal management air conditioning system is in the single battery cooling mode, if the compressor inlet superheat △T 2 If the temperature drops below 1°C and lasts for 20 seconds, the compressor will be shut down for protection. If the number of shutdowns exceeds 3 times within 10 minutes, the compressor will be locked, that is, the battery cooling will no longer be allowed. If the battery water inlet temperature T j >23℃, the normal speed regulation of the compressor is restored, that is, the main speed regulation strategy of the compressor is restored; when the thermal management air conditioning system is not in the single battery cooling mode, if the compressor inlet superheat △T2 ≤1℃ and lasts for 60s, the compressor is controlled to shut down for protection, but not locked, and after 30s, the compressor is controlled to restart; when the cab overheats △T 3 ≤1℃ and lasts for 60s, the compressor is controlled to shut down for protection. After shutdown and 30s, if the evaporator surface temperature T b1 >6℃, the compressor is controlled to start and operate according to the normal speed regulation strategy.

[0172] Exemplary Devices

[0173] like Figure 8 As shown, the embodiment of the present application further provides a compressor protection device, including a monitoring module 801 and a control module 802 .

[0174] in,

[0175] A 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 the speed, reduce the speed, shut down or lock it according to the air conditioning system protection strategy based on the operating data.

[0177] The compressor protection device provided in this embodiment belongs to the same application concept as the compressor protection method provided in the above embodiments of this application, and can execute the method provided in any of the above embodiments of this application, and has the corresponding functional modules and beneficial effects of the execution method. For technical details not fully described in this embodiment, please refer to 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 above monitoring module 801 and control module 802 can be implemented in the form of software called by the same or different processors, and the embodiments of the present application are not limited thereto.

[0179] Exemplary Electronic Devices

[0180] Another embodiment of the present application also provides an electronic device, see Fig. 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 further include: a bus, a communication interface 920 , an input device 930 and an output device 940 .

[0184] The processor 910, the memory 900, the communication interface 920, the input device 930 and the output device 940 are connected to each other via a bus.

[0185] A bus may include a pathway that transfers information between components of a computer system.

[0186] The processor 910 may 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 for controlling the execution of the program of the present application. It may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0187] The processor 910 may include a main processor, and may also include a baseband chip, a modem, and the like.

[0188] The memory 900 stores a program for executing the technical solution of the present application, and may also store an operating system and other key services. Specifically, the program may include a program code, and the program code includes computer operation instructions. More specifically, the memory 900 may include a read-only memory (ROM), other types of static storage devices that can store static information and instructions, a random access memory (RAM), other types of dynamic storage devices that can store information and instructions, a disk storage, a flash, and the like.

[0189] The input device 930 may include a device for receiving data and information input by a user, such as a keyboard, a mouse, a camera, a scanner, a light pen, a voice input device, a touch screen, a pedometer, or a 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 any transceiver or the like to communicate with other devices or communication networks, such as Ethernet, a radio access network (RAN), a 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 each step of any compressor protection method provided in the above embodiments of the present application.

[0193] Those skilled in the art will understand that Fig. 9 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of 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 a different arrangement of components.

[0194] An embodiment of the present application also proposes a chip, which includes 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 introduced in any of the above embodiments. The specific processing process and its beneficial effects can be found in the introduction to the above-mentioned embodiment of the compressor protection method.

[0195] An embodiment of the present application also provides a vehicle, in which the above-mentioned compressor protection device or the above-mentioned electronic device is provided.

[0196] In addition to the above-mentioned methods and devices, an embodiment of the present application proposes a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the compressor protection method according to various embodiments of the present application described in the above-mentioned "Exemplary Method" section of this specification.

[0197] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0198] In addition, an embodiment of the present application further proposes a storage medium on which a computer program is stored, and the computer program is executed by a processor to execute the steps of the compressor protection method according to various embodiments of the present application described in the above "Exemplary Method" section of this specification.

[0199] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0200] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0201] It should also be noted that in the device, apparatus and method of the present invention, each component or each step can be decomposed and / or reassembled, and such decomposition and / or reassembly should be regarded as an equivalent solution 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 present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

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

[0204] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A compressor protection method, characterized in that: Applied in a thermal management air conditioning system, the thermal management air conditioning system includes the compressor, and the method includes: Monitoring the operating data of the thermal management air conditioning system; Based on the operating data and in accordance with an air conditioning system protection strategy, the compressor is controlled to maintain a rotation speed, reduce a rotation speed, shut down, or lock.

2. The compressor protection method according to claim 1, characterized in that: The operating data includes the refrigerant high pressure, the refrigerant low pressure, the compressor exhaust temperature, the battery panel exchange outlet superheat, the cab superheat, the compressor inlet superheat, the evaporator surface temperature and the refrigerant evaporation saturation temperature; The air conditioning system protection strategy includes a high pressure protection strategy, a low pressure protection strategy, an exhaust temperature protection strategy, an anti-icing protection strategy and an overheat protection strategy.

3. The compressor protection method according to claim 2, characterized in that: The controlling the compressor to maintain a rotation speed, reduce a rotation speed, shut down or lock the compressor based on the operating data and in accordance with the air conditioning system protection strategy includes: If the refrigerant high pressure pressure is higher than the first preset high pressure pressure and lower than the second preset high pressure pressure, controlling the compressor to maintain the current speed; If the refrigerant high pressure is higher than the second preset high pressure and lower than the third preset high pressure, and lasts for a first preset time, the maximum speed of the compressor is controlled to be the first preset speed; If the refrigerant high-pressure pressure is higher than the third preset high-pressure pressure and lasts for a second preset time, the compressor is controlled to shut down, and when the number of shutdowns of the compressor within the preset locking time exceeds the preset number of shutdowns, the compressor is controlled to lock.

4. The compressor protection method according to claim 2, characterized in that: The controlling the compressor to maintain a rotation speed, reduce a rotation speed, shut down or lock the compressor based on the operating data and in accordance with the air conditioning system protection strategy includes: If the refrigerant low pressure is lower than the first preset low pressure, controlling the compressor to stop; If the refrigerant low pressure is higher than the first preset low pressure and lower than the second preset low pressure, and lasts for a fourth preset time, controlling the compressor to stop; After the compressor is stopped, if the number of stops of the compressor within a preset locking time period exceeds a preset number of stops, the compressor is controlled to be locked.

5. The compressor protection method according to claim 2, characterized in that: The controlling the compressor to maintain a rotation speed, reduce a rotation speed, shut down or lock the compressor based on the operating data and in accordance with the air conditioning system protection strategy includes: If the compressor exhaust temperature is higher than the preset exhaust temperature and lasts for a sixth preset time period, and the compressor speed is lower than the second preset speed, the compressor is controlled to stop; If the compressor exhaust temperature is higher than the preset exhaust temperature and continues for the sixth preset time period, and the compressor speed is greater than the second preset speed, the compressor is controlled to reduce the speed until the compressor exhaust temperature is higher than the preset exhaust temperature and continues for the sixth preset time period, and the compressor speed is less than the second preset speed, and the compressor is controlled to stop.

6. The compressor protection method according to claim 2, characterized in that: The controlling the compressor to maintain a rotation speed, reduce a rotation speed, shut down or lock the compressor based on the operating data and in accordance with the air conditioning system protection strategy includes: If the surface temperature of the evaporator is lower than the first preset surface temperature, controlling the maximum speed of the compressor to be a third preset speed; After controlling the maximum speed of the compressor to be the third preset speed, if the surface temperature of the evaporator is lower than the second preset surface temperature, controlling the compressor to operate at a fourth preset speed, and when the duration of the evaporator surface temperature being lower than the second preset surface temperature exceeds a ninth preset duration, controlling the compressor to stop, and the third preset speed is greater than the fourth preset speed; If the evaporation saturation temperature is lower than the first preset saturation temperature, controlling the maximum speed of the compressor to be a fifth preset speed; After controlling the maximum speed of the compressor to be the fifth preset speed, if the evaporation saturation temperature is lower than the second preset saturation temperature and the temperature difference is less than the preset temperature difference, the compressor is controlled to operate at the sixth preset speed, and when the duration during 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, and the temperature difference is the difference between the evaporator surface temperature and the evaporation saturation temperature.

7. The compressor protection method according to claim 2, characterized in that: The controlling the compressor to maintain a rotation speed, reduce a rotation speed, shut down or lock the compressor based on the operating data and in accordance with the air conditioning system protection strategy includes: If the superheat degree of the solar panel exchange outlet is lower than the first preset superheat degree and lasts for a thirteenth preset time, the compressor is controlled to stop, and when the number of stops of the compressor in the preset locking time exceeds the preset number of stops, the compressor is controlled to lock; If the cab overheat degree is lower than the second preset overheat degree and lasts for a fourteenth preset time period, controlling the compressor to stop; If, when the thermal management air conditioning system is in the single-battery cooling mode, the superheat degree of the compressor air inlet is lower than a third preset superheat degree and lasts for a fifteenth preset time period, the compressor is controlled to stop, and when the number of stops of the compressor during the preset locking time period exceeds a preset number of stops, the compressor is controlled to lock; If, when the thermal management air-conditioning system is not in the single-battery cooling mode, the compressor air inlet superheat is lower than the third preset superheat and lasts for the sixteenth preset time period, the compressor is controlled to shut down, and the length of the fifteenth preset time period is greater than the length of the sixteenth preset time period.

8. A compressor protection device, characterized in that: Applied in a thermal management air conditioning system, the thermal management air conditioning system includes the compressor, and the device includes: A monitoring module, used to monitor the operating data of the thermal management air conditioning system; The control module is used to control the compressor to maintain a rotation speed, reduce a rotation speed, shut down or lock the compressor according to an air conditioning system protection strategy based on the operating data.

9. An electronic device, characterized in that: including memory and processor; The memory is connected to the processor and is used to store programs; The processor is used to implement the compressor protection method according to any one of claims 1 to 7 by running the program in the memory.

10. A vehicle, characterized in that: The vehicle is provided with the compressor protection device according to claim 8 or the electronic device according to claim 9.

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