Thermal management system control method and device, vehicle, equipment and medium

Abstract

The invention relates to a thermal management system control method and device, a vehicle, equipment and a medium, which are used for realizing a cooling target of a dynamic response battery. The method comprises the steps that when only the cooling requirement of a battery pack is recognized, the opening degree of an electronic expansion valve connected between a battery cooler and a condenser is controlled according to the actual superheat degree of an inlet of a compressor and the target optimal superheat degree, and the rotating speed of the compressor is controlled according to the actual water inlet temperature and the target water inlet temperature of the battery pack; the water pump connected between the battery cooler and the battery pack is controlled according to the working state of the compressor, the temperature of the battery pack and the environment temperature; and when the battery pack cooling requirement and the passenger compartment cooling requirement are recognized, the opening degree of an electronic expansion valve connected between a battery cooler and a condenser is controlled according to the actual superheat degree of the compressor inlet and the target optimal superheat degree.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of electric vehicle control technology, and specifically to a thermal management system control method, device, vehicle, equipment and medium. Background Art

[0002] When charging and driving at high temperatures, new energy vehicles generally need to cool their batteries to keep the battery temperature within an appropriate range to obtain a larger charge and discharge current. Conventional battery cooling generally starts when the vehicle thermal management system receives a cooling request from the battery, and stops cooling when the battery stops sending a cooling request.

[0003] The vehicle thermal management system needs to meet the cooling needs of both the battery and the passenger compartment. The conventional vehicle thermal management system control strategy has the following problems in the battery cooling process: 1. When cooling the battery alone, the thermal management system usually only responds to a fixed cooling target. When the battery is about to be fully charged at the end of charging, the battery charging current and heat generation have been reduced to a certain value. If the cooling is performed according to the same cooling target as during the charging process, energy will be wasted; 2. When the passenger compartment cooling + battery cooling is in operation, the thermal management system usually only adjusts the compressor speed according to the passenger compartment cooling demand. At this time, the battery cooling target cannot be guaranteed. Summary of the invention

[0004] In view of the above problems, embodiments of the present invention provide a thermal management system control method, apparatus, vehicle, device and medium for achieving the cooling target of a dynamically responsive battery.

[0005] The technical solution of the present invention is: In one aspect, the present application provides a thermal management system control method, comprising: When only the battery pack cooling demand is identified, the opening of the electronic expansion valve connected between the battery cooler and the condenser is controlled according to the actual superheat of the compressor inlet and the target optimal superheat, the compressor speed is controlled according to the actual inlet water temperature of the battery pack and the target inlet water temperature, and the water pump connected between the battery cooler and the battery pack is controlled according to the working state of the compressor, the battery pack temperature and the ambient temperature; When the battery pack cooling demand and the passenger compartment cooling demand are identified, the opening of the electronic expansion valve connected between the battery cooler and the condenser is controlled according to the actual superheat at the compressor inlet and the target optimal superheat, the compressor speed is controlled according to the actual battery pack water inlet temperature, the target water inlet temperature, the evaporator temperature in the passenger compartment and the target evaporator temperature, and the water pump connected between the battery cooler and the battery pack is controlled according to the compressor working status, battery pack temperature and ambient temperature.

[0006] Preferably, when only the battery pack cooling demand is identified or when both the battery pack cooling demand and the passenger compartment cooling demand are identified, the step of controlling the opening of the electronic expansion valve connected between the battery cooler and the condenser according to the actual superheat at the compressor inlet and the target optimal superheat includes: The target opening of the electronic expansion valve is obtained by calculating the difference PI between the actual superheat at the compressor inlet and the target optimal superheat; The larger opening is taken between the target opening and the preset minimum opening of the electronic expansion valve, and the opening of the electronic expansion valve is controlled so that the actual superheat of the compressor is always maintained within the preset superheat range with the difference from the target optimal superheat.

[0007] Preferably, when only the battery pack cooling requirement is identified, the step of controlling the compressor speed according to the actual water inlet temperature of the battery pack and the target water inlet temperature includes: Determine the speed corresponding to the actual water inlet temperature of the battery pack, and control the compressor speed so that the actual water inlet temperature of the battery pack gradually approaches the target water inlet temperature; If the actual water inlet temperature of the battery pack changes to be lower than the target water inlet temperature and the difference between the actual water inlet temperature of the battery pack and the target water inlet temperature exceeds the preset temperature difference, the compressor is controlled to shut down.

[0008] Preferably, when only the battery pack cooling requirement is identified, the step of controlling the water pump connected between the battery cooler and the battery pack according to the compressor working state, the battery pack temperature and the ambient temperature includes: When the compressor is running, control the water pump to work at the maximum speed; When the compressor stops, if the maximum temperature of the battery pack is less than or equal to the ambient temperature, the water pump is controlled to stop working; When the compressor stops, if the maximum temperature of the battery pack is greater than the ambient temperature, the water pump is controlled to operate at the maximum speed.

[0009] Preferably, when the battery pack cooling demand and the passenger compartment cooling demand are identified, the step of controlling the compressor speed according to the actual battery pack water inlet temperature, the target water inlet temperature, the evaporator temperature in the passenger compartment and the target evaporator temperature includes: The first compressor speed is obtained by calculating the difference PI between the evaporator temperature in the passenger compartment and the target evaporator temperature; The second compressor speed is obtained by calculating the difference PI between the actual water inlet temperature of the battery pack and the target water inlet temperature; The compressor is controlled to operate at a sum of the first compressor speed and the second compressor speed.

[0010] Preferably, when the cooling demand of the battery pack and the cooling demand of the passenger compartment are identified, the step of controlling the water pump connected between the battery cooler and the battery pack according to the working state of the compressor, the battery pack temperature and the ambient temperature includes: When the speed of the second compressor is greater than 0, the water pump is controlled to operate at the maximum speed; When the speed of the second compressor is equal to 0, if the maximum temperature of the battery pack is less than or equal to the ambient temperature, the water pump is controlled to stop working; When the speed of the second compressor is equal to 0, if the maximum temperature of the battery pack is greater than the ambient temperature, the water pump is controlled to operate at the maximum speed.

[0011] On the other hand, the present application also provides a thermal management system control device, comprising: a first control module, for controlling the opening of an electronic expansion valve connected between a battery cooler and a condenser according to an actual superheat degree and a target optimal superheat degree of a compressor inlet, controlling the speed of the compressor according to an actual inlet water temperature and a target inlet water temperature of the battery pack, and controlling a water pump connected between the battery cooler and the battery pack according to a working state of the compressor, a battery pack temperature and an ambient temperature, when only a cooling demand for the battery pack is identified; The second control module is used to control the opening of the electronic expansion valve connected between the battery cooler and the condenser according to the actual superheat at the compressor inlet and the target optimal superheat when the battery pack cooling demand and the passenger compartment cooling demand are identified, control the compressor speed according to the actual battery pack water inlet temperature, the target water inlet temperature, the evaporator temperature in the passenger compartment and the target evaporator temperature, and control the water pump connected between the battery cooler and the battery pack according to the compressor working state, the battery pack temperature and the ambient temperature.

[0012] Preferably, the first control module includes: A first target opening calculation unit is used to calculate the target opening of the electronic expansion valve according to the difference PI between the actual superheat at the compressor inlet and the target optimal superheat; The first opening control unit is used to control the opening of the electronic expansion valve by taking the larger opening between the target opening and the preset minimum opening of the electronic expansion valve, so that the actual superheat of the compressor is always maintained within a preset superheat range with a difference from the target optimal superheat.

[0013] Preferably, the first control module includes: A first compressor speed control unit is used to determine a speed corresponding to an actual water inlet temperature of the battery pack and to control the compressor speed so that the actual water inlet temperature of the battery pack gradually approaches a target water inlet temperature; The second compressor speed control unit is used to control the compressor to stop if the actual water inlet temperature of the battery pack changes to below the target water inlet temperature and the difference between the actual water inlet temperature of the battery pack and the target water inlet temperature exceeds a preset temperature difference.

[0014] Preferably, the first control module includes: A first water pump speed control unit, used to control the water pump to operate at a maximum speed when the compressor is running; A second water pump speed control unit is used to control the water pump to stop working if the maximum temperature of the battery pack is less than or equal to the ambient temperature when the compressor is stopped; The third water pump speed control unit is used to control the water pump to operate at the maximum speed when the compressor is stopped and if the maximum temperature of the battery pack is greater than the ambient temperature.

[0015] Preferably, the second control module includes: A second target opening calculation unit is used to calculate the target opening of the electronic expansion valve according to the difference PI between the actual superheat at the compressor inlet and the target optimal superheat; The second opening control unit is used to control the opening of the electronic expansion valve by taking the larger opening between the target opening and the preset minimum opening of the electronic expansion valve, so that the actual superheat of the compressor is always maintained within the preset superheat range by the difference with the target optimal superheat.

[0016] Preferably, the second control module includes: A first compressor speed determination unit, configured to obtain a first compressor speed by calculating a difference PI between an evaporator temperature in a passenger compartment and a target evaporator temperature; A second compressor speed determination unit, configured to obtain a second compressor speed by calculating a difference PI between an actual water inlet temperature of the battery pack and a target water inlet temperature; The third compressor speed control unit is used to control the operation of the compressor with the sum of the first compressor speed and the second compressor speed.

[0017] Preferably, the second control module includes: a fourth water pump speed control unit, configured to control the water pump to operate at a maximum speed when the speed of the second compressor is greater than 0; a fifth water pump speed control unit, configured to control the water pump to stop working when the speed of the second compressor is equal to 0 and the maximum temperature of the battery pack is less than or equal to the ambient temperature; The sixth water pump speed control unit is used to control the water pump to operate at the maximum speed when the speed of the second compressor is equal to 0 and if the maximum temperature of the battery pack is greater than the ambient temperature.

[0018] On the other hand, the present application also provides a vehicle, comprising the above-mentioned thermal management system control device.

[0019] On the other hand, the present application also provides a control device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the thermal management system control method as described above.

[0020] On the other hand, the present application also provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the thermal management system control method as described above are implemented.

[0021] The beneficial effects of the present invention are: When cooling the battery alone, the compressor, water pump and electronic expansion valve in the thermal management system will work in response to different targets respectively. When the battery is about to be fully charged at the charging end, the battery charging current and heat generation have been reduced to a certain value. The thermal management system can reasonably control the compressor speed, water pump speed and electronic expansion valve opening according to the actual target to avoid energy waste. When the cooling needs of the passenger compartment and the battery exist at the same time, the compressor speed that meets the cooling needs of the passenger compartment and the battery works to meet the cooling needs of the passenger compartment and the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The purpose of the vehicle thermal management system in the embodiment of the present invention; Figure 2 Flow chart of a thermal management system control method in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0024] Reference Figure 1 The embodiment of the present application provides a new energy thermal management system, which includes: a thermal management controller, a compressor, a condenser, a battery chiller, an electronic expansion valve, a water pump, and a battery pack. The refrigerant channels of the compressor, the condenser, the electronic expansion valve, and the battery chiller are connected in sequence to form a refrigerant loop, the water pump, the coolant channel of the battery chiller, and the battery pack are connected in sequence to form a coolant loop, and the thermal management controller is connected to the electronic expansion valve, the water pump, the compressor, and the temperature sensor provided on the battery pack to form a communication loop.

[0025] Based on the above-mentioned new energy thermal management system, the present application embodiment provides a reference Figure 2 The thermal management system control method shown includes: S1, after the vehicle is powered on, determine whether only the battery pack cooling demand is received.

[0026] Among them, the battery pack cooling requirement is determined by the thermal management controller based on the battery cooling request issued by the battery management system.

[0027] S2, when only the battery pack cooling demand is identified, the opening of the electronic expansion valve connected between the battery cooler and the condenser is controlled according to the actual superheat of the compressor inlet and the target optimal superheat, the compressor speed is controlled according to the actual water inlet temperature of the battery pack and the target water inlet temperature, and the water pump connected between the battery cooler and the battery pack is controlled according to the working state of the compressor, the battery pack temperature and the ambient temperature.

[0028] S3: If it is determined in S1 that not only the battery pack cooling demand is received, then determine whether other cooling demands include the passenger compartment cooling demand.

[0029] Among them, the cooling demand of the passenger compartment is identified based on the input signal of the passenger compartment driver.

[0030] S4, when the battery pack cooling demand and the passenger compartment cooling demand are identified, the opening of the electronic expansion valve connected between the battery cooler and the condenser is controlled according to the actual superheat at the compressor inlet and the target optimal superheat, the compressor speed is controlled according to the actual battery pack water inlet temperature, the target water inlet temperature, the evaporator temperature in the passenger compartment and the target evaporator temperature, and the water pump connected between the battery cooler and the battery pack is controlled according to the compressor working state, the battery pack temperature and the ambient temperature.

[0031] Reference Figure 2 In an embodiment of the present application, when the cooling demand of the battery pack and the cooling demand of the passenger compartment are identified, in the step of controlling the opening of the electronic expansion valve connected between the battery cooler and the condenser according to the actual superheat at the compressor inlet and the target optimal superheat, the opening of the electronic expansion valve is calculated by PI based on the error between the actual superheat at the compressor inlet and the target optimal superheat, so that the actual superheat of the compressor is always maintained near the target optimal superheat to obtain the optimal heat exchange efficiency; in particular, in an embodiment of the present application, there is a minimum opening limit for the electronic expansion valve (the minimum opening is set in advance, and the preset minimum opening is used to prevent the compressor from shutting down due to high-pressure protection), and it is required that the opening of the electronic expansion valve cannot be lower than the minimum opening to avoid shutting down due to high-pressure protection of the compressor.

[0032] In an embodiment of the present application, when only the battery pack cooling demand is identified, the step of controlling the compressor speed according to the actual water inlet temperature of the battery pack and the target water inlet temperature includes: determining the speed corresponding to the actual water inlet temperature of the battery pack, and controlling the compressor speed so that the actual water inlet temperature of the battery pack gradually approaches the target water inlet temperature; if the actual water inlet temperature of the battery pack changes to below the target water inlet temperature and the difference between the actual water inlet temperature of the battery pack and the target water inlet temperature exceeds the preset temperature difference, the compressor is controlled to stop. In other words, the compressor outputs the speed according to the actual water inlet temperature of the battery pack and the preset speed corresponding to the actual water inlet temperature of the battery pack; wherein, the higher the actual water inlet temperature of the battery pack, the higher the preset speed corresponding to the compressor, so as to achieve rapid cooling of the battery pack. After the actual water inlet temperature of the battery pack decreases, the compressor speed can be appropriately reduced so that the compressor speed and the actual water inlet temperature of the battery pack gradually reach a steady state. During the compressor speed adjustment process, if the actual water inlet temperature of the battery pack drops to the target temperature, and the difference between the actual water inlet temperature of the battery pack and the target water inlet temperature exceeds the preset temperature difference (such as 3 degrees), the compressor is controlled to shut down to avoid unnecessary energy waste until the actual water inlet temperature of the battery pack is greater than the target water inlet temperature again and the compressor starts again.

[0033] In the embodiment of the present application, when only the battery pack cooling demand is identified, the step of controlling the water pump connected between the battery cooler and the battery pack according to the working state of the compressor, the battery pack temperature and the ambient temperature includes: when the compressor is running, the water pump is controlled to work at the maximum speed; when the compressor is stopped, if the maximum temperature of the battery pack is less than or equal to the ambient temperature, the water pump is controlled to stop working; when the compressor is stopped, if the maximum temperature of the battery pack is greater than the ambient temperature, the water pump is controlled to work at the maximum speed. That is: the water pump always works at the maximum speed when the compressor is working; when the compressor stops running: if the maximum temperature of the battery pack is less than or equal to the ambient temperature, the water pump stops working; otherwise, the water pump works at the maximum speed.

[0034] In the embodiment of the present application, when the cooling demand of the battery pack and the cooling demand of the passenger compartment are identified, the step of controlling the opening of the electronic expansion valve connected between the battery cooler and the condenser according to the actual superheat of the compressor inlet and the target optimal superheat includes: calculating the target opening of the electronic expansion valve according to the difference PI of the actual superheat of the compressor inlet and the target optimal superheat; taking the larger opening between the target opening and the preset minimum opening of the electronic expansion valve, and controlling the opening of the electronic expansion valve, so that the actual superheat of the compressor is always maintained within the preset superheat range with the difference from the target optimal superheat. That is, the working strategy of the electronic expansion valve is consistent with the cooling demand strategy of the single battery, and in particular, the electronic expansion valve also has a minimum opening limit to avoid the frequent start and stop of the electronic expansion valve, which causes the air outlet temperature fluctuation in the passenger compartment.

[0035] When the cooling demand of the battery pack and the passenger compartment are identified, the steps of controlling the compressor speed according to the actual water inlet temperature of the battery pack, the target water inlet temperature, the evaporator temperature in the passenger compartment and the target evaporator temperature include: calculating the first compressor speed according to the difference PI between the evaporator temperature in the passenger compartment and the target evaporator temperature; calculating the second compressor speed according to the difference PI between the actual water inlet temperature of the battery pack and the target water inlet temperature; and controlling the compressor operation with the sum of the first compressor speed and the second compressor speed. That is: the compressor speed is output by adding the output speeds of the following two strategies: ① The compressor is adjusted according to the PI based on the difference between the evaporator temperature in the passenger compartment and the target evaporator temperature, so that the actual evaporator temperature is always maintained near the target evaporator temperature; ② The compressor speed is adjusted according to the strategy under the single battery cooling condition, so that the actual water inlet temperature of the battery pack is always maintained near the target water inlet temperature.

[0036] When the cooling demand of the battery pack and the passenger compartment are identified, the step of controlling the compressor speed according to the actual water inlet temperature of the battery pack, the target water inlet temperature, the evaporator temperature in the passenger compartment and the target evaporator temperature includes: calculating the first compressor speed according to the difference PI between the evaporator temperature in the passenger compartment and the target evaporator temperature; calculating the second compressor speed according to the difference PI between the actual water inlet temperature of the battery pack and the target water inlet temperature; and controlling the compressor operation with the sum of the first compressor speed and the second compressor speed. Also, the water pump is adjusted according to the compressor strategy ② speed. If the output speed of the compressor strategy ② is greater than 0, the battery cooling circuit water pump has been working at the maximum speed to achieve the maximum coolant flow in the battery cooling circuit; if the output speed of the compressor strategy ② is equal to 0, the battery pack maximum temperature and the ambient temperature need to be compared and judged again: if the battery pack maximum temperature is less than or equal to the ambient temperature, the water pump is stopped to avoid the battery coolant being affected by the ambient temperature and bringing coolant with a higher temperature relative to the battery into the battery pack; if the battery pack maximum temperature is greater than the ambient temperature, the battery cooling circuit water pump is operated at the maximum speed to cool the battery.

[0037] In the control method of the embodiment of the present application, when exiting battery cooling, if the thermal management controller receives a battery cooling stop instruction sent by the battery, the battery cooling is exited. In particular, if the current working condition is battery cooling only, the compressor should be turned off first, and then the electronic expansion valve should be turned off. If the current working condition is battery cooling and passenger compartment cooling, only the electronic expansion valve and the battery cooling circuit water pump are turned off, and the compressor continues to work.

[0038] In the above method in the embodiment of the present application, when cooling the battery alone, the compressor, water pump and electronic expansion valve in the thermal management system will respectively respond to different goals to work. When the charging terminal is about to be fully charged, the battery charging current and heat generation have been reduced to a certain value. The compressor speed, water pump speed and electronic expansion valve opening can be reasonably controlled according to the actual goals to avoid energy waste. When the cooling demand of the passenger compartment and the battery cooling demand exist at the same time, the compressor speed that meets the cooling demand of the passenger compartment and the battery cooling demand works to meet the cooling demand of the passenger compartment and the battery.

[0039] On the other hand, the present application also provides a thermal management system control device, comprising: a first control module, for controlling the opening of an electronic expansion valve connected between a battery cooler and a condenser according to an actual superheat degree and a target optimal superheat degree of a compressor inlet, controlling the speed of the compressor according to an actual inlet water temperature and a target inlet water temperature of the battery pack, and controlling a water pump connected between the battery cooler and the battery pack according to a working state of the compressor, a battery pack temperature and an ambient temperature, when only a cooling demand for the battery pack is identified; The second control module is used to control the opening of the electronic expansion valve connected between the battery cooler and the condenser according to the actual superheat at the compressor inlet and the target optimal superheat when the battery pack cooling demand and the passenger compartment cooling demand are identified, control the compressor speed according to the actual battery pack water inlet temperature, the target water inlet temperature, the evaporator temperature in the passenger compartment and the target evaporator temperature, and control the water pump connected between the battery cooler and the battery pack according to the compressor working state, the battery pack temperature and the ambient temperature.

[0040] Preferably, the first control module includes: A first target opening calculation unit is used to calculate the target opening of the electronic expansion valve according to the difference PI between the actual superheat at the compressor inlet and the target optimal superheat; The first opening control unit is used to control the opening of the electronic expansion valve by taking the larger opening between the target opening and the preset minimum opening of the electronic expansion valve, so that the actual superheat of the compressor is always maintained within a preset superheat range with a difference from the target optimal superheat.

[0041] Preferably, the first control module includes: A first compressor speed control unit is used to determine a speed corresponding to an actual water inlet temperature of the battery pack and to control the compressor speed so that the actual water inlet temperature of the battery pack gradually approaches a target water inlet temperature; The second compressor speed control unit is used to control the compressor to stop if the actual water inlet temperature of the battery pack changes to below the target water inlet temperature and the difference between the actual water inlet temperature of the battery pack and the target water inlet temperature exceeds a preset temperature difference.

[0042] Preferably, the first control module includes: A first water pump speed control unit, used to control the water pump to operate at a maximum speed when the compressor is running; A second water pump speed control unit is used to control the water pump to stop working if the maximum temperature of the battery pack is less than or equal to the ambient temperature when the compressor is stopped; The third water pump speed control unit is used to control the water pump to operate at the maximum speed when the compressor is stopped and if the maximum temperature of the battery pack is greater than the ambient temperature.

[0043] Preferably, the second control module includes: A second target opening calculation unit is used to calculate the target opening of the electronic expansion valve according to the difference PI between the actual superheat at the compressor inlet and the target optimal superheat; The second opening control unit is used to control the opening of the electronic expansion valve by taking the larger opening between the target opening and the preset minimum opening of the electronic expansion valve, so that the actual superheat of the compressor is always maintained within the preset superheat range by the difference with the target optimal superheat.

[0044] Preferably, the second control module includes: A first compressor speed determination unit, configured to obtain a first compressor speed by calculating a difference PI between an evaporator temperature in a passenger compartment and a target evaporator temperature; A second compressor speed determination unit, configured to obtain a second compressor speed by calculating a difference PI between an actual water inlet temperature of the battery pack and a target water inlet temperature; The third compressor speed control unit is used to control the operation of the compressor with the sum of the first compressor speed and the second compressor speed.

[0045] Preferably, the second control module includes: a fourth water pump speed control unit, configured to control the water pump to operate at a maximum speed when the speed of the second compressor is greater than 0; a fifth water pump speed control unit, configured to control the water pump to stop working when the speed of the second compressor is equal to 0 and the maximum temperature of the battery pack is less than or equal to the ambient temperature; The sixth water pump speed control unit is used to control the water pump to operate at the maximum speed when the speed of the second compressor is equal to 0 and if the maximum temperature of the battery pack is greater than the ambient temperature.

[0046] The thermal management system control device in the embodiment of the present application is a device corresponding to the thermal management system control method described above, and has the same technical effect as the control method described above, namely: when cooling the battery alone, the compressor, water pump and electronic expansion valve in the thermal management system will work in response to different targets respectively. When the charging terminal is about to be fully charged, the battery charging current and heat generation have been reduced to a certain value, and the compressor speed, water pump speed and electronic expansion valve opening can be reasonably controlled according to the actual target to avoid energy waste; when the passenger compartment cooling demand and battery cooling demand exist at the same time, the compressor speed that meets the passenger compartment cooling demand and battery cooling demand works, and the cooling demand of the passenger compartment and the battery is met at the same time. .

[0047] On the other hand, the present application also provides a vehicle, comprising the above-mentioned thermal management system control device.

[0048] On the other hand, the present application also provides a control device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the thermal management system control method as described above.

[0049] On the other hand, the present application also provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the thermal management system control method as described above are implemented.

[0050] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0051] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0052] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, relational terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements does not include those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0053] The technical solution provided by the present invention is described in detail above. The principle and implementation mode of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the present invention, and the content of this specification should not be understood as limiting the present invention. At the same time, for those skilled in the art, according to the present invention, there will be different forms of changes in the specific implementation mode and application scope. It is not necessary and impossible to list all the implementation modes here, and the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A thermal management system control method, characterized in that: include: When only the battery pack cooling demand is identified, the opening of the electronic expansion valve connected between the battery cooler and the condenser is controlled according to the actual superheat of the compressor inlet and the target optimal superheat, the compressor speed is controlled according to the actual inlet water temperature of the battery pack and the target inlet water temperature, and the water pump connected between the battery cooler and the battery pack is controlled according to the working state of the compressor, the battery pack temperature and the ambient temperature; When the battery pack cooling demand and the passenger compartment cooling demand are identified, the opening of the electronic expansion valve connected between the battery cooler and the condenser is controlled according to the actual superheat at the compressor inlet and the target optimal superheat, the compressor speed is controlled according to the actual battery pack water inlet temperature, the target water inlet temperature, the evaporator temperature in the passenger compartment and the target evaporator temperature, and the water pump connected between the battery cooler and the battery pack is controlled according to the compressor working status, battery pack temperature and ambient temperature.

2. The thermal management system control method according to claim 1, characterized in that: When only a battery pack cooling requirement is identified or when both a battery pack cooling requirement and a passenger compartment cooling requirement are identified, the step of controlling the opening of an electronic expansion valve connected between a battery cooler and a condenser according to an actual superheat at a compressor inlet and a target optimal superheat includes: The target opening of the electronic expansion valve is obtained by calculating the difference PI between the actual superheat at the compressor inlet and the target optimal superheat; The larger opening is taken between the target opening and the preset minimum opening of the electronic expansion valve, and the opening of the electronic expansion valve is controlled so that the actual superheat of the compressor is always maintained within the preset superheat range with the difference from the target optimal superheat.

3. The thermal management system control method according to claim 1, characterized in that: When only the battery pack cooling requirement is identified, the steps of controlling the compressor speed according to the actual battery pack inlet water temperature and the target inlet water temperature include: Determine the speed corresponding to the actual water inlet temperature of the battery pack, and control the compressor speed so that the actual water inlet temperature of the battery pack gradually approaches the target water inlet temperature; If the actual water inlet temperature of the battery pack changes to be lower than the target water inlet temperature and the difference between the actual water inlet temperature of the battery pack and the target water inlet temperature exceeds the preset temperature difference, the compressor is controlled to shut down.

4. The thermal management system control method according to claim 1, characterized in that: When only the battery pack cooling requirement is identified, the steps of controlling the water pump connected between the battery cooler and the battery pack according to the compressor working state, the battery pack temperature and the ambient temperature include: When the compressor is running, control the water pump to work at the maximum speed; When the compressor stops, if the maximum temperature of the battery pack is less than or equal to the ambient temperature, the water pump is controlled to stop working; When the compressor stops, if the maximum temperature of the battery pack is greater than the ambient temperature, the water pump is controlled to operate at the maximum speed.

5. The thermal management system control method according to claim 1, characterized in that: When the cooling demand of the battery pack and the cooling demand of the passenger compartment are identified, the steps of controlling the compressor speed according to the actual water inlet temperature of the battery pack, the target water inlet temperature, the evaporator temperature in the passenger compartment and the target evaporator temperature include: The first compressor speed is obtained by calculating the difference PI between the evaporator temperature in the passenger compartment and the target evaporator temperature; The second compressor speed is obtained by calculating the difference PI between the actual water inlet temperature of the battery pack and the target water inlet temperature; The compressor is controlled to operate at a sum of the first compressor speed and the second compressor speed.

6. The thermal management system control method according to claim 5, characterized in that: When the cooling demand of the battery pack and the passenger compartment is identified, the steps of controlling the water pump connected between the battery cooler and the battery pack according to the working state of the compressor, the battery pack temperature and the ambient temperature include: When the speed of the second compressor is greater than 0, the water pump is controlled to operate at the maximum speed; When the speed of the second compressor is equal to 0, if the maximum temperature of the battery pack is less than or equal to the ambient temperature, the water pump is controlled to stop working; When the speed of the second compressor is equal to 0, if the maximum temperature of the battery pack is greater than the ambient temperature, the water pump is controlled to operate at the maximum speed.

7. A thermal management system control device, characterized in that: include: a first control module, for controlling the opening of an electronic expansion valve connected between a battery cooler and a condenser according to an actual superheat degree and a target optimal superheat degree of a compressor inlet, controlling the speed of the compressor according to an actual inlet water temperature and a target inlet water temperature of the battery pack, and controlling a water pump connected between the battery cooler and the battery pack according to a working state of the compressor, a battery pack temperature and an ambient temperature, when only a cooling demand for the battery pack is identified; The second control module is used to control the opening of the electronic expansion valve connected between the battery cooler and the condenser according to the actual superheat at the compressor inlet and the target optimal superheat when the battery pack cooling demand and the passenger compartment cooling demand are identified, control the compressor speed according to the actual battery pack water inlet temperature, the target water inlet temperature, the evaporator temperature in the passenger compartment and the target evaporator temperature, and control the water pump connected between the battery cooler and the battery pack according to the compressor working state, the battery pack temperature and the ambient temperature.

8. A vehicle, characterized in that: Includes the thermal management system control device as described in claim 7.

9. A control device, characterized in that: It includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the thermal management system control method as described in any one of claims 1 to 6.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the thermal management system control method according to any one of claims 1 to 6 are implemented.

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