CN-122008807-A - Control method and device of vehicle thermal management system, vehicle and storage medium

CN122008807ACN 122008807 ACN122008807 ACN 122008807ACN-122008807-A

Abstract

The invention discloses a control method, a device, a vehicle and a storage medium of a vehicle thermal management system, wherein the control method of the vehicle thermal management system comprises the steps of obtaining vehicle operation parameters, determining a thermal management mode of the vehicle based on the vehicle operation parameters, determining a rotating speed value of a compressor and an opening value of an electronic expansion valve based on the thermal management mode, performing closed-loop regulation processing on the rotating speed value to obtain a target rotating speed value, performing closed-loop regulation processing on the opening value to obtain a target opening value, and controlling the operation of the thermal management system of the vehicle based on the target rotating speed value and the target opening value. The invention solves the technical problem that the mode switching of the thermal management system cannot be responded in time because the compressor and the electronic expansion valve are not cooperatively regulated in the process of controlling the operation of the thermal management system of the vehicle in the prior art.

Inventors

LIU QIBIN
GAO XIANJIN
SHEN YAN
LU YUNJIA

Assignees

一汽解放汽车有限公司

Dates

Publication Date: 20260512
Application Date: 20260210

Claims (10)

1. A control method of a vehicle thermal management system, characterized by comprising: acquiring vehicle operation parameters, wherein the vehicle operation parameters comprise an environment temperature value, a passenger cabin temperature value and a battery temperature value; Determining a thermal management mode of the vehicle based on the vehicle operating parameters; Determining a rotation speed value of the compressor and an opening value of the electronic expansion valve based on the thermal management mode; Performing closed-loop regulation on the rotating speed value to obtain a target rotating speed value, and performing closed-loop regulation on the opening value to obtain a target opening value; and controlling the operation of a thermal management system of the vehicle based on the target rotating speed value and the target opening degree value.
2. The control method of a vehicle thermal management system according to claim 1, characterized in that determining the thermal management mode based on the vehicle operation parameter includes: determining a first passenger compartment temperature threshold and a first battery temperature threshold based on the ambient temperature value; Determining that the thermal management mode is a passenger compartment cooling mode in response to the passenger compartment temperature value being greater than the first passenger compartment temperature threshold; determining that the thermal management mode is a battery cooling mode in response to the battery temperature value being greater than the first battery temperature threshold; In response to the passenger compartment temperature value being greater than the first passenger compartment temperature threshold and the battery temperature value being greater than the first battery temperature threshold, the thermal management mode is determined to be a dual cooling mode.
3. The method of controlling a vehicle thermal management system according to claim 2, wherein determining the thermal management mode based on the vehicle operating parameter further comprises: determining a second passenger compartment temperature threshold and a second battery temperature threshold based on the ambient temperature value, wherein the second passenger compartment temperature threshold is less than the first passenger compartment temperature threshold and the second battery temperature threshold is less than the first battery temperature threshold; And determining that the thermal management mode is a heat pump heating mode in response to the passenger compartment temperature value being less than the second passenger compartment temperature threshold or the battery temperature value being less than the second battery temperature threshold.
4. The control method of the vehicle thermal management system according to claim 2, characterized in that determining the rotation speed value based on the thermal management mode includes: Acquiring a target refrigeration temperature value of the passenger cabin and a current evaporator temperature value of the compressor in response to the thermal management mode being the passenger cabin refrigeration mode; determining an evaporator temperature value for the passenger compartment based on the target refrigeration temperature value; Calculating a first temperature difference between an evaporator temperature value of the passenger compartment and a current evaporator temperature value of the compressor; The rotational speed value is determined based on the first temperature difference.
5. The control method of the vehicle thermal management system according to claim 2, characterized in that determining the opening value based on the thermal management mode includes: Acquiring a target superheat value of an electronic expansion valve of the passenger cabin, an evaporator outlet temperature value of the electronic expansion valve of the passenger cabin and an evaporator outlet pressure of the electronic expansion valve of the passenger cabin in response to the thermal management mode being the passenger cabin refrigeration mode; Determining a refrigerant saturation temperature value based on the evaporator outlet pressure; determining a current superheat value of the passenger cabin electronic expansion valve based on the evaporator outlet temperature value and the refrigerant saturation temperature value; calculating a second temperature difference between the target superheat value and the current superheat value; And determining the opening value based on the second temperature difference value.
6. The control method of the vehicle thermal management system according to claim 2, characterized in that determining the rotation speed value and the opening degree value based on the thermal management mode includes: Responding to the thermal management mode to be the double-refrigeration mode, and judging whether a dynamic correction working condition exists in the vehicle thermal management system or not; determining a target correction component based on the dynamic correction condition in response to the vehicle thermal management system having the dynamic correction condition; Acquiring a corrected temperature value and a corrected superheat value of the target correction component; and determining the rotating speed value based on the corrected temperature value, and determining the opening value based on the corrected superheat value.
7. The control method of a vehicle thermal management system according to claim 1, characterized in that the method further comprises: continuously monitoring an exhaust pressure and an exhaust temperature of the compressor in response to controlling a thermal management system operation of the vehicle; in response to detecting that the exhaust pressure is greater than an exhaust pressure threshold or the exhaust temperature is greater than an exhaust temperature threshold, reducing the rotational speed value to a preset ratio; Responding to the operation of the compressor according to the rotating speed value of the preset proportion for a preset time, and acquiring the current exhaust pressure and the current exhaust temperature of the compressor; And controlling the thermal management system to stop operating in response to monitoring that the current exhaust pressure is greater than the exhaust pressure threshold or the current exhaust temperature is greater than the exhaust temperature threshold.
8. A control device of a vehicle thermal management system, characterized by comprising: The system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring vehicle operation parameters, and the vehicle operation parameters comprise an environment temperature value, a passenger cabin temperature value and a battery temperature value; A first determination module for determining a thermal management mode of the vehicle based on the vehicle operating parameters; The second determining module is used for determining the rotating speed value of the compressor and the opening value of the electronic expansion valve based on the thermal management mode; the processing module is used for performing closed-loop adjustment processing on the rotating speed value to obtain a target rotating speed value, and performing closed-loop adjustment processing on the opening value to obtain a target opening value; And the first control module is used for controlling the operation of a thermal management system of the vehicle based on the target rotating speed value and the target opening degree value.
9. A vehicle comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the control method of the vehicle thermal management system as claimed in any one of the preceding claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program, wherein the computer program is arranged to execute the control method of the vehicle thermal management system as claimed in any one of the preceding claims 1 to 7 when run on a computer or processor.

Description

Control method and device of vehicle thermal management system, vehicle and storage medium Technical Field The invention relates to the technical field of automatic control, in particular to a control method and device of a vehicle thermal management system, a vehicle and a storage medium. Background With the popularization of pure electric vehicles, a heat pump air conditioning system has become a core subsystem for realizing passenger cabin comfort, power battery thermal safety and whole vehicle energy efficiency optimization. In the system, the compressor is responsible for establishing refrigerant circulation pressure difference, the electronic expansion valve regulates and controls the superheat degree to match the heat exchange requirement of the evaporator, and the cooperative operation of the electronic expansion valve and the evaporator directly influences the response speed, the energy efficiency performance and the operation stability of the system. In practical application scenes, the vehicle needs to frequently switch various heat management modes, such as passenger cabin refrigeration, battery cooling, dual-loop cooperation, heat pump heating and the like, and particularly under dynamic working conditions of quick charge, energy recovery, low-temperature start and the like, the heat load suddenly changes frequently, and the system is required to have quick and stable mode switching capability so as to avoid overlarge temperature fluctuation, energy efficiency reduction or component overload. However, in the current mainstream control strategy, independent closed loop feedback control is usually adopted for the compressor and the electronic expansion valve, the rotation speed of the compressor is adjusted according to the evaporation temperature or the thermal load demand, the electronic expansion valve is subjected to PID adjustment according to the superheat deviation, and the intrinsic time delay and the response phase difference exist in the actions of the compressor and the electronic expansion valve. At the moment of mode switching, due to the lack of a synchronous regulation mechanism, the regulation of the rotation speed of the compressor is delayed from the change of the thermal load, and the opening response of the expansion valve cannot be matched with the system pressure dynamically, so that the evaporation pressure is fluctuated severely, the superheat degree is overshot, the exhaust temperature is abnormal, and even the system oscillation or the control instability is caused. In the prior art, the dynamic coupling and the resource competition under the composite working condition cannot be dealt with by the multi-dependence fixed threshold dividing working condition or the single-channel feedforward compensation, so that the system has slow response and poor stability during mode switching, and the real-time and reliability requirements under the high-dynamic thermal management scene are difficult to meet. Disclosure of Invention The embodiment of the invention provides a control method and device of a vehicle thermal management system, a vehicle and a storage medium, which at least solve the technical problem that the mode switching of the thermal management system cannot be responded in time because the compressor and an electronic expansion valve are not cooperatively regulated in the process of controlling the operation of the vehicle thermal management system in the prior art. According to one embodiment of the invention, a control method of a vehicle thermal management system is provided, and the control method comprises the steps of obtaining vehicle operation parameters, wherein the vehicle operation parameters comprise an environment temperature value, a passenger cabin temperature value and a battery temperature value, determining a thermal management mode of the vehicle based on the vehicle operation parameters, determining a rotating speed value of a compressor and an opening value of an electronic expansion valve based on the thermal management mode, performing closed-loop adjustment processing on the rotating speed value to obtain a target rotating speed value, performing closed-loop adjustment processing on the opening value to obtain a target opening value, and controlling the operation of the thermal management system of the vehicle based on the target rotating speed value and the target opening value. Optionally, the control method of the vehicle thermal management system further comprises the steps of determining a first passenger cabin temperature threshold value and a first battery temperature threshold value based on the environmental temperature value, determining that the thermal management mode is a passenger cabin refrigeration mode in response to the passenger cabin temperature value being greater than the first passenger cabin temperature threshold value, determining that the thermal management mode is a battery refrigeration mode in response to the bat