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CN-116852955-B - Control method and device for vehicle cooling system

CN116852955BCN 116852955 BCN116852955 BCN 116852955BCN-116852955-B

Abstract

The embodiment of the invention provides a control method and device for a vehicle cooling system, and belongs to the field of vehicle control. The method comprises the steps that in a battery pack refrigeration mode or a passenger cabin refrigeration mode, the rotation speed of the compressor and the opening of the switching valve on the refrigeration loop are regulated to be switched to the battery pack refrigeration mode and the passenger cabin refrigeration mode, when the passenger cabin and the battery pack are refrigerated simultaneously through the battery pack refrigeration mode and the passenger cabin refrigeration mode, the rotation speed of the air conditioner compressor is determined based on the battery pack refrigeration mode and the passenger cabin refrigeration mode together, the opening of the second switching valve in the second refrigeration loop corresponding to the battery pack refrigeration mode is determined by the first target rotation speed of the air conditioner compressor, and therefore the rotation speed of the compressor and the opening of the switching valve can be regulated according to different refrigeration requirements, the refrigeration requirements corresponding to different modes are met, and accordingly the flexibility and the accuracy of the refrigeration of the vehicle refrigeration system are improved.

Inventors

  • YAN MENG
  • ZHANG ZHIWEN
  • YAO FAN
  • FANG QINGLONG
  • YANG ZEGUANG

Assignees

  • 奇瑞汽车股份有限公司

Dates

Publication Date
20260505
Application Date
20230808

Claims (8)

  1. 1. A method of controlling a vehicle cooling system, the method comprising: In a first refrigeration mode, if a refrigeration requirement corresponding to a second refrigeration mode is received, determining a first target rotating speed of an air conditioner compressor based on the first refrigeration mode and the second refrigeration mode, wherein the first target rotating speed is used for meeting the refrigeration requirement corresponding to the first refrigeration mode and the second refrigeration mode; If the first cooling mode is the battery pack cooling mode, after a first switching valve in a first cooling circuit corresponding to the passenger compartment cooling mode is adjusted from a closed state to an open state, the rotating speed of the air conditioner compressor is adjusted to the first target rotating speed, wherein in the process of adjusting the rotating speed of the air conditioner compressor to the first target rotating speed, the opening degree of a second switching valve in a second cooling circuit corresponding to the battery pack cooling mode is adjusted to a first target opening degree, the second switching valve is in an open state in the battery pack cooling mode, and the first target opening degree is determined according to the first target rotating speed of the air conditioner compressor; If the first cooling mode is the passenger cabin cooling mode, in the process of adjusting the rotating speed of the air conditioner compressor to the first target rotating speed, adjusting a second switching valve in the second cooling loop from a closed state to a second target opening degree, wherein the first switching valve is in an open state in the passenger cabin cooling mode, and the second target opening degree is determined according to the first target rotating speed of the compressor; The determining a first target rotational speed of the air conditioner compressor based on the first cooling mode and the second cooling mode includes: determining a first rotating speed of the air-conditioning compressor corresponding to the first refrigeration mode and determining a second rotating speed of the air-conditioning compressor corresponding to the second refrigeration mode; determining the first target rotation speed according to the first rotation speed and the second rotation speed; when the first cooling mode is the passenger cabin cooling mode, the determining the first rotation speed of the air-conditioning compressor corresponding to the first cooling mode includes: Acquiring the current ambient temperature, the illumination intensity of the current sunlight, the actual evaporator temperature of the evaporator and the temperature change rate of the actual evaporator temperature of the evaporator; determining a target air outlet temperature of an air outlet of the air conditioner according to the environment temperature, the illumination intensity and the first corresponding relation; determining a target in-vehicle temperature of the vehicle according to the environment temperature, the initial temperature set by the user and the second corresponding relation; determining a first compensation temperature of the air port according to a first difference value and a third corresponding relation between the actual temperature in the vehicle and the target temperature in the vehicle; Compensating the temperature of the target air outlet based on the first compensation temperature to obtain the temperature of the target evaporator; The method comprises the steps of determining a first initial rotating speed of an air conditioner compressor according to a target evaporator temperature, determining a second compensating rotating speed according to the temperature change rate, determining a first compensating rotating speed of the air conditioner compressor according to a second difference value between the actual evaporator temperature and the target evaporator temperature and the ambient temperature, determining a second compensating rotating speed according to the temperature change rate, and determining the first rotating speed based on the first initial rotating speed, the first compensating rotating speed and the second compensating rotating speed.
  2. 2. The method of claim 1, wherein when the first cooling mode is the passenger compartment cooling mode, the determining the second rotational speed of the air conditioning compressor corresponding to the second cooling mode comprises: Acquiring the average battery temperature, the ambient temperature, the battery refrigeration water inlet temperature and the target water inlet temperature corresponding to the battery pack, wherein the target water inlet temperature is determined based on the highest cell temperature of the batteries in the battery pack; determining a second initial rotational speed of the air conditioner compressor according to the average battery temperature and the ambient temperature; determining a third compensation rotating speed according to the battery refrigeration water inlet temperature and the target water inlet temperature; and determining the second rotating speed according to the second initial rotating speed and the third compensating rotating speed.
  3. 3. The method according to claim 1, wherein the method further comprises: If the passenger cabin refrigerating mode and the battery pack refrigerating mode are started, if the refrigerating requirement of closing the battery pack refrigerating mode is received, determining a third rotating speed of the air-conditioning compressor corresponding to the passenger cabin refrigerating mode, wherein when the passenger cabin refrigerating mode and the battery pack refrigerating mode are started at the same time, the first switch valve and the second switch valve are in an open state; And in the process of reducing the rotating speed of the air conditioner compressor to the third rotating speed, closing a second switch valve on the second refrigeration loop.
  4. 4. The method according to claim 1, wherein the method further comprises: If the passenger cabin refrigerating mode and the battery pack refrigerating mode are started, and if the refrigerating requirement for closing the passenger cabin refrigerating mode is received, determining a fourth rotating speed of the air-conditioning compressor corresponding to the battery pack refrigerating mode and determining a fourth target opening degree of the second switching valve, wherein the first switching valve and the second switching valve are in an opening state when the passenger cabin refrigerating mode and the battery pack refrigerating mode are started at the same time; And after the rotating speed of the air conditioner compressor is reduced to the fourth rotating speed, regulating the first switching valve in the first refrigeration loop to be in a closed state, wherein the opening degree of the second switching valve is regulated to be the fourth target opening degree in the process that the rotating speed of the air conditioner compressor is reduced to the fourth rotating speed.
  5. 5. The method according to claim 1, wherein the method further comprises: And in the battery pack refrigeration mode, if the refrigeration requirement of closing the battery pack refrigeration mode and opening the passenger cabin refrigeration mode is received, determining the fifth rotating speed of the air-conditioning compressor corresponding to the passenger cabin refrigeration mode, and after the first switch valve is adjusted from the closed state to the open state, closing the second switch valve and adjusting the rotating speed of the air-conditioning compressor to the fifth rotating speed.
  6. 6. The method according to claim 1, wherein the method further comprises: And in the passenger cabin refrigeration mode, if the refrigeration requirement of starting the battery pack refrigeration mode and closing the passenger cabin refrigeration mode is received, determining a sixth rotating speed of the air-conditioning compressor corresponding to the battery pack refrigeration mode, closing the first switch valve, and adjusting the second switch valve from a closed state to an open state, and then adjusting the rotating speed of the air-conditioning compressor to the sixth rotating speed.
  7. 7. The method of claim 1, wherein adjusting the second on-off valve in the second refrigeration circuit from the closed state to the second target opening degree during the adjusting the rotational speed of the air-conditioning compressor to the first target rotational speed comprises: And after the rotating speed of the air conditioner compressor is adjusted to a seventh rotating speed according to a first rotating speed changing rate, the second switching valve is adjusted to a third target opening degree from a closed state, the second switching valve is kept at the third target opening degree for a first preset time, the opening degree of the second switching valve is increased to the second target opening degree from the third target opening degree after the first preset time, and the rotating speed of the air conditioner compressor is adjusted to the first target rotating speed according to a second rotating speed changing rate.
  8. 8. A control device of a vehicle cooling system, characterized by comprising: The system comprises a determining module, a control module and a control module, wherein the determining module is used for determining a first target rotating speed of an air conditioner compressor based on a first refrigerating mode and a second refrigerating mode if a refrigerating requirement corresponding to the second refrigerating mode is received in the first refrigerating mode, wherein the first target rotating speed is used for meeting the refrigerating requirement corresponding to the first refrigerating mode and the second refrigerating mode; The first adjusting module is configured to adjust, if the first cooling mode is the battery pack cooling mode, a rotation speed of the air-conditioning compressor to the first target rotation speed after adjusting a first switching valve in a first cooling circuit corresponding to the passenger compartment cooling mode from a closed state to an open state, wherein in the process of adjusting the rotation speed of the air-conditioning compressor to the first target rotation speed, an opening degree of a second switching valve in a second cooling circuit corresponding to the battery pack cooling mode is adjusted to a first target opening degree, and the second switching valve is in an open state in the battery pack cooling mode, wherein the first target opening degree is determined according to the first target rotation speed of the air-conditioning compressor; The second adjusting module is used for adjusting the rotating speed of the air conditioner compressor to the first target rotating speed in the process of adjusting the second switching valve in the second refrigerating loop from a closed state to a second target opening degree if the first refrigerating mode is the passenger cabin refrigerating mode, wherein the first switching valve is in an open state in the passenger cabin refrigerating mode, and the second target opening degree is determined according to the first target rotating speed of the compressor; the determining module is used for determining a first rotating speed of the air-conditioning compressor corresponding to the first refrigerating mode and a second rotating speed of the air-conditioning compressor corresponding to the second refrigerating mode; When the first cooling mode is the passenger cabin cooling mode, the determining module is configured to: Acquiring the current ambient temperature, the illumination intensity of the current sunlight, the actual evaporator temperature of the evaporator and the temperature change rate of the actual evaporator temperature of the evaporator; determining a target air outlet temperature of an air outlet of the air conditioner according to the environment temperature, the illumination intensity and the first corresponding relation; determining a target in-vehicle temperature of the vehicle according to the environment temperature, the initial temperature set by the user and the second corresponding relation; determining a first compensation temperature of the air port according to a first difference value and a third corresponding relation between the actual temperature in the vehicle and the target temperature in the vehicle; Compensating the temperature of the target air outlet based on the first compensation temperature to obtain the temperature of the target evaporator; The method comprises the steps of determining a first initial rotating speed of an air conditioner compressor according to a target evaporator temperature, determining a second compensating rotating speed according to the temperature change rate, determining a first compensating rotating speed of the air conditioner compressor according to a second difference value between the actual evaporator temperature and the target evaporator temperature and the ambient temperature, determining a second compensating rotating speed according to the temperature change rate, and determining the first rotating speed based on the first initial rotating speed, the first compensating rotating speed and the second compensating rotating speed.

Description

Control method and device for vehicle cooling system Technical Field The invention relates to the field of vehicle control, in particular to a control method and device of a vehicle cooling system. Background At present, a new energy vehicle generally adopts an air conditioner compressor shared by a passenger cabin and a battery pack as a refrigeration source, and the passenger cabin or the battery pack can be independently refrigerated through the air conditioner compressor, and the passenger cabin and the battery pack can be refrigerated simultaneously. In the related art, in the refrigerating process through the air-conditioning compressor, if the passenger cabin is refrigerated, the battery pack is refrigerated, and the passenger cabin is refrigerated and the battery pack is refrigerated at the same time, only the valve on the loop which is required by refrigeration is opened, and the valves on other loops which are not required by refrigeration are closed, so that the air-conditioning compressor is ensured to refrigerate the corresponding loop, for example, when the passenger cabin is refrigerated through the air-conditioning compressor currently, if the battery pack also needs to refrigerate, the switch valve on the loop corresponding to the battery pack is required to be opened, so that the air-conditioning compressor is used for refrigerating the passenger cabin and the battery pack at the same time. However, when the above scheme is switched between different modes, the rotation speed of the compressor and the opening degree of the switch valve cannot be adjusted according to different refrigeration demands, so that the flexibility and the accuracy of the refrigeration of the vehicle cooling system in different modes are low, and the user experience is poor. Disclosure of Invention The embodiment of the invention provides a control method and a control device for a vehicle cooling system, which can solve the problem of lower flexibility and accuracy of refrigeration of a vehicle cooling system in the related technology. The technical scheme is as follows: In one aspect, a method of controlling a vehicle cooling system is provided, the method comprising: In a first refrigeration mode, if a refrigeration requirement corresponding to a second refrigeration mode is received, determining a first target rotating speed of an air conditioner compressor based on the first refrigeration mode and the second refrigeration mode, wherein the first target rotating speed is used for meeting the refrigeration requirement corresponding to the first refrigeration mode and the second refrigeration mode; If the first cooling mode is the battery pack cooling mode, after a first switching valve in a first cooling circuit corresponding to the passenger compartment cooling mode is adjusted from a closed state to an open state, the rotating speed of the air conditioner compressor is adjusted to the first target rotating speed, wherein in the process of adjusting the rotating speed of the air conditioner compressor to the first target rotating speed, the opening degree of a second switching valve in a second cooling circuit corresponding to the battery pack cooling mode is adjusted to a first target opening degree, the second switching valve is in an open state in the battery pack cooling mode, and the first target opening degree is determined according to the first target rotating speed of the air conditioner compressor; And if the first cooling mode is the passenger cabin cooling mode, in the process of adjusting the rotating speed of the air conditioner compressor to the first target rotating speed, adjusting a second switching valve in the second cooling loop from a closed state to a second target opening degree, wherein the first switching valve is in an open state in the passenger cabin cooling mode, and the second target opening degree is determined according to the first target rotating speed of the compressor. Optionally, the determining the first target rotation speed of the air conditioner compressor based on the first refrigeration mode and the second refrigeration mode includes: determining a first rotating speed of the air-conditioning compressor corresponding to the first refrigeration mode and determining a second rotating speed of the air-conditioning compressor corresponding to the second refrigeration mode; And determining the first target rotating speed according to the first rotating speed and the second rotating speed. Optionally, when the first cooling mode is the passenger cabin cooling mode, the determining the first rotation speed of the air conditioner compressor corresponding to the first cooling mode includes: Acquiring the current ambient temperature, the illumination intensity of the current sunlight, the actual evaporator temperature of the evaporator and the temperature change rate of the actual evaporator temperature of the evaporator; determining a target evaporator temperature of an air co