Search

CN-121989636-A - Thermal management system of vehicle and control method thereof

CN121989636ACN 121989636 ACN121989636 ACN 121989636ACN-121989636-A

Abstract

The invention relates to a thermal management system of a vehicle and a control method thereof. The control method of the thermal management system of the vehicle may include determining whether a compressor retard operation condition is satisfied in a state where the compressor is not operated, controlling the compressor retard operation when the compressor retard operation condition is determined to be satisfied, determining whether a battery cooling condition is satisfied when the compressor retard operation condition is determined not to be satisfied, controlling the compressor operation when the battery cooling condition is determined to be satisfied, determining whether an A/C switch of an air conditioner is on in a state where the compressor is operated, controlling the compressor to suspend operation when the A/C switch of the air conditioner is determined to be on, determining whether a compressor resume operation condition is satisfied in a state where the compressor is suspended operation, and opening an expansion valve and controlling the compressor to resume operation when the compressor resume operation condition is determined to be satisfied.

Inventors

  • HOU QINGDONG
  • Zheng taixun
  • ZHAI XIAORUI

Assignees

  • 现代自动车株式会社
  • 起亚株式会社

Dates

Publication Date
20260508
Application Date
20241107

Claims (14)

  1. 1. A thermal management system for a vehicle, comprising: an evaporator provided in the air conditioner; an expansion valve disposed upstream of the evaporator; A battery cooler provided in parallel with the evaporator for cooling the coolant by heat exchange between the coolant and a refrigerant supplied from the air conditioner, thereby cooling the battery by the cooled coolant; a compressor for compressing a refrigerant, and A controller configured to: Determining whether a delayed operation condition of the compressor is satisfied in a state in which the compressor is not operated; When the condition of the delayed operation of the compressor is determined to be met, controlling the delayed operation of the compressor; When the delayed operation condition of the compressor is not met, determining whether the battery cooling condition is met; when the condition of cooling the battery is determined to be met, controlling the operation of the compressor; Determining whether a state of an a/C switch of the air conditioner is on in a state in which the compressor is operated; When the state of the A/C switch of the air conditioner is determined to be on, controlling the compressor to stop running; determining whether a compressor recovery operation condition is satisfied in a state in which the compressor is stopped; when it is determined that the compressor recovery operation condition is satisfied, the expansion valve is opened and the compressor is controlled to recover operation.
  2. 2. The thermal management system of a vehicle of claim 1, wherein the controller is configured to: sensing an ambient temperature after the vehicle is started; Determining whether a state of an a/C switch of the air conditioner is on when the sensed ambient temperature is higher than a predetermined temperature; when the sensed ambient temperature is higher than a predetermined temperature and it is determined that the state of the a/C switch of the air conditioner is off, it is determined whether the compressor retard operation condition is satisfied.
  3. 3. The thermal management system of a vehicle of claim 2, wherein the controller is configured to: Determining that a compressor retard operating condition is satisfied when an elapsed time after the vehicle is started does not exceed a first predetermined time, a vehicle speed is less than a predetermined vehicle speed, and a battery requested compressor speed is less than a first compressor speed; wherein, in the case that the compressor delayed operation condition is satisfied, the compressor is not operated for a first predetermined time after the vehicle is started.
  4. 4. A thermal management system of a vehicle according to claim 3, wherein the controller is configured to: When the delayed compressor operation condition is not met, determining whether the battery requested compressor speed is greater than a second compressor speed; And when the compressor rotating speed requested by the battery is determined to be larger than the second compressor rotating speed, determining that the battery cooling condition is met.
  5. 5. The thermal management system of a vehicle of claim 4, wherein the controller is configured to: When it is determined that the battery cooling condition is not satisfied, it is determined whether the state of an A/C switch of the air conditioner is on.
  6. 6. The thermal management system of a vehicle of claim 1, wherein the controller is configured to: Determining expansion valve opening noise according to a pressure difference of refrigerant between upstream and downstream of the expansion valve in a state in which the compressor is stopped, and determining operation noise of the vehicle; Comparing the determined opening noise of the expansion valve with the running noise of the vehicle; When the expansion valve opening noise is smaller than the operation noise of the vehicle, it is determined that the compressor recovery operation condition is satisfied.
  7. 7. The thermal management system of a vehicle of claim 6, wherein the controller is configured to: When the opening noise of the expansion valve is greater than or equal to the running noise of the vehicle, determining whether the elapsed time after the operation of the compressor is stopped exceeds a second preset time; When it is determined that the time elapsed after the suspension of the operation of the compressor exceeds the second predetermined time, the expansion valve is opened and the compressor is controlled to resume the operation.
  8. 8. A control method of a thermal management system of a vehicle, comprising: Determining whether a delayed operation condition of the compressor is satisfied in a state in which the compressor is not operated; When the condition of the delayed operation of the compressor is determined to be met, controlling the delayed operation of the compressor; When the delayed operation condition of the compressor is not met, determining whether the battery cooling condition is met; when the condition of cooling the battery is determined to be met, controlling the operation of the compressor; Determining whether a state of an a/C switch of the air conditioner is on in a state in which the compressor is operated; When the state of the A/C switch of the air conditioner is determined to be on, controlling the compressor to stop running; determining whether a compressor recovery operation condition is satisfied in a state in which the compressor is stopped; when it is determined that the compressor recovery operation condition is satisfied, the expansion valve is opened and the compressor is controlled to recover operation.
  9. 9. The control method according to claim 8, further comprising: sensing an ambient temperature after the vehicle is started; Determining whether a state of an a/C switch of the air conditioner is on when the sensed ambient temperature is higher than a predetermined temperature; when the sensed ambient temperature is higher than a predetermined temperature and it is determined that the state of the a/C switch of the air conditioner is off, it is determined whether the compressor retard operation condition is satisfied.
  10. 10. The control method according to claim 9, further comprising: Determining that a compressor retard operating condition is satisfied when an elapsed time after the vehicle is started does not exceed a first predetermined time, a vehicle speed is less than a predetermined vehicle speed, and a battery requested compressor speed is less than a first compressor speed; wherein, in the case that the compressor delayed operation condition is satisfied, the compressor is not operated for a first predetermined time after the vehicle is started.
  11. 11. The control method according to claim 10, further comprising: When the delayed compressor operation condition is not met, determining whether the battery requested compressor speed is greater than a second compressor speed; And when the compressor rotating speed requested by the battery is determined to be larger than the second compressor rotating speed, determining that the battery cooling condition is met.
  12. 12. The control method according to claim 11, further comprising: When it is determined that the battery cooling condition is not satisfied, it is determined whether the state of an A/C switch of the air conditioner is on.
  13. 13. The control method according to claim 8, further comprising: Determining expansion valve opening noise according to a pressure difference of refrigerant between upstream and downstream of the expansion valve in a state in which the compressor is stopped, and determining operation noise of the vehicle; Comparing the determined opening noise of the expansion valve with the running noise of the vehicle; When the expansion valve opening noise is smaller than the operation noise of the vehicle, it is determined that the compressor recovery operation condition is satisfied.
  14. 14. The control method according to claim 13, further comprising: When the opening noise of the expansion valve is greater than or equal to the running noise of the vehicle, determining whether the elapsed time after the operation of the compressor is stopped exceeds a second preset time; When it is determined that the time elapsed after the suspension of the operation of the compressor exceeds the second predetermined time, the expansion valve is opened and the compressor is controlled to resume the operation.

Description

Thermal management system of vehicle and control method thereof Technical Field The present invention relates to a thermal management system of a vehicle and a control method thereof, which can improve cooling performance in a vehicle while ensuring cooling performance of a battery of an electric vehicle. Background An electric vehicle is provided with a high-voltage battery as a power source of the vehicle. In order to bring the high-voltage battery of the vehicle to an optimum operating temperature, a battery cooling device of an electric vehicle is provided with a battery cooler (battery). The battery cooler of the battery cooling device and the evaporator of the air conditioning device are disposed in parallel, so that the battery cooler can cool the coolant by heat exchange between the coolant in the battery cooling device and the refrigerant supplied from the air conditioning device, thereby cooling the high-voltage battery by the cooled coolant. Expansion valves for expanding the refrigerant are provided upstream of the battery cooler and the evaporator, respectively. The expansion valve provided upstream of the battery cooler is an electronic expansion valve that can precisely control the valve opening degree, and for cost saving, the expansion valve provided upstream of the evaporator is usually a mechanical expansion valve having only two states of opening and closing. In the battery cooling mode, if the user turns on the a/C switch of the air conditioner, a mechanical expansion valve provided upstream of the evaporator is opened. The mechanical expansion valve, when open, may generate a loud noise due to the pressure difference of the refrigerant between the upstream and downstream of the mechanical expansion valve. To avoid the generation of large noise, the existing air conditioner stops the operation of the compressor for a certain period of time such that the pressure difference of the refrigerant between the upstream and downstream of the mechanical expansion valve is reduced, and then opens the mechanical expansion valve and resumes the operation of the compressor. The compressor shutdown is detrimental to both battery cooling and in-vehicle cooling. Therefore, it is desirable to avoid the compressor from being stopped as much as possible or to shorten the duration of the compressor stopping operation as much as possible when the compressor stopping operation cannot be avoided. The information contained in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. Disclosure of Invention Various aspects of the present invention are directed to solving the above-described problems of the prior art, and other technical problems not mentioned herein will be clearly understood by those skilled in the art from the following detailed description of the specification. Various aspects of the present invention are directed to providing a thermal management system of a vehicle and a control method thereof that are capable of improving cooling performance in a vehicle while ensuring cooling performance of a battery of an electric vehicle. According to an aspect of the present invention, a thermal management system of a vehicle may include an evaporator provided to an air conditioning apparatus, an expansion valve provided upstream of the evaporator, a battery cooler provided in parallel with the evaporator for cooling a coolant by heat exchange between the coolant and a refrigerant supplied from the air conditioning apparatus, thereby cooling the battery with the cooled coolant, a compressor for compressing the refrigerant, and a controller configured to determine whether a compressor retard operation condition is satisfied in a state in which the compressor is not operated, to control the compressor retard operation when it is determined that the compressor retard operation condition is satisfied, to determine whether a battery cooling condition is satisfied when it is determined that the compressor retard operation condition is not satisfied, to control the compressor operation when it is determined that the battery cooling condition is satisfied, to control the compressor to stop operation when it is determined that the state of an A/C switch of the air conditioning apparatus is on, to control the compressor to resume operation when it is determined that the compressor stop operation condition is satisfied, and to control the compressor to resume operation when it is determined that the compressor retard operation condition is not satisfied. In an exemplary embodiment, the controller may be configured to sense an ambient temperature after the vehicle is started; And determining whether a compressor retard operating condition is satisfied when the sensed ambient temperature is h