INTEGRATED HEAT MANAGEMENT SYSTEM OF VEHICLE

• US 20190315185A1
• Filed: 04/10/2019
• Published: 10/17/2019
• Est. Priority Date: 04/11/2018
• Status: Active Grant

• Current Assignee: Hanon Systems (Hahn & Co. Auto Holdings Co. Ltd.)
• Original Assignee: Hanon Systems (Hahn & Co. Auto Holdings Co. Ltd.)
• Inventors: KIM, Doo Hoon, KIM, Hyeon Gyu, AN, Kyung Ju, YOO, Sang Jun, HAN, Joong Man
• Granted Patent: US 11,331,978 B2
• Time in Patent Office: Days
• CPC Class Codes: B60H 1/00278 for the battery arrangement of batteries B60R16/04
• CPC Class Codes: B60H 1/00899 Controlling the flow of liquid in a heat pump system controlling the properties of the refrigerant liquid, e.g. pressure or temperature, B60H1/3204
• CPC Class Codes: B60H 1/00921 where the flow direction of the refrigerant does not change and there is an extra subcondenser, e.g. in an air duct
• CPC Class Codes: B60H 1/3208 Vehicle drive related control of the compressor drive means, e.g. for fuel saving purposes
• CPC Class Codes: B60H 1/3228 characterised by refrigerant circuit configurations
• CPC Class Codes: B60H 2001/00307 Component temperature regulation using a liquid flow
• CPC Class Codes: B60H 2001/00928 comprising a secondary circuit
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 1/02 to electric heating circuits
• CPC Class Codes: B60L 2240/34 Cabin temperature
• CPC Class Codes: B60L 2240/36 Temperature of vehicle components or parts
• CPC Class Codes: B60L 58/26 by cooling
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An integrated heat management system for a vehicle includes an air conditioner configured to cool or heat a passenger compartment using a refrigerant, a water-cooled cooling device configured to cool a specific device using the refrigerant of the air conditioner, and an air conditioning load change preventing unit configured to prevent a sudden change in an air conditioning load of the air conditioner when turning on or off the water-cooled cooling device with respect to the air conditioner.

Claims

1. An integrated heat management system for a vehicle, comprising:

an air conditioner configured to cool or heat a passenger compartment using a refrigerant;

a water-cooled cooling device configured to cool a specific device using the refrigerant of the air conditioner; and

an air conditioning load change preventing unit configured to prevent a sudden change in an air conditioning load of the air conditioner when turning on or off the water-cooled cooling device with respect to the air conditioner.

2. The system of claim 1, wherein the air conditioner includes a first refrigerant line configured to cool or heat the passenger compartment, a second refrigerant line configured to divert a part of the refrigerant in the first refrigerant line, an expansion valve installed in the second refrigerant line, a refrigerant-cooling water heat exchanger installed in the second refrigerant line, a cooling water circulation line configured to transfer cold energy of the refrigerant to a specific device using the refrigerant-cooling water heat exchanger and a water pump configured to circulate cooling water through the cooling water circulation line, and

the air conditioning load change preventing unit includes a control unit configured to differently control operation timings of the expansion valve and the water pump when the water-cooled cooling device is turned on or off with respect to the air conditioner.

3. The system of claim 2, wherein the control unit is configured to differently control the operation timings of the expansion valve and the water pump according to a temperature of the specific device and a temperature of the cooling water in the cooling water circulation line when the water-cooled cooling device is turned on or off with respect to the air conditioner.

4. The system of claim 3, wherein the control unit is configured to control a compressor of the air conditioner when the water-cooled cooling device is turned on or off with respect to the air conditioner.

5. The system of claim 4, wherein the water-cooled cooling device is a water-cooled battery cooling device configured to cool a battery,

the expansion valve is a battery cooling expansion valve having a shut-off function, and

the control unit is configured to differently control the operation timings of the expansion valve and the water pump according to a temperature of the battery and a temperature of the cooling water in the cooling water circulation line when the water-cooled battery cooling device is turned on or off with respect to the air conditioner.

6. The system of claim 5, wherein when the water-cooled battery cooling device is turned on to cool the battery in a state in which the air conditioner is operating in an air conditioner mode, the control unit comes into a primary cooling mode to turn on the water pump of the cooling water circulation line if the temperature of the battery is equal to or higher than a predetermined first battery reference temperature, and then comes into a secondary cooling mode to open the battery cooling expansion valve if the temperature of the battery is equal to or higher than a second battery reference temperature which is higher than the first battery reference temperature and if the temperature of the cooling water in the cooling water circulation line is equal to or higher than a predetermined first cooling water reference temperature.

7. The system of claim 6, wherein the control unit controls a rotation speed of the water pump to become lowest when coming into the primary cooling mode, and turns off the water pump and re-operates the water pump after lapse of a predetermined time when coming into the secondary cooling mode.

8. The system of claim 7, wherein the control unit increases a rotation speed of the compressor of the air conditioner when coming into the secondary cooling mode.

9. The system of claim 8, wherein the control unit executes control such that, when coming into the secondary cooling mode, an operation of increasing the rotation speed of the compressor of the air conditioner and an operation of opening the battery cooling expansion valve are sequentially performed with a predetermined time lag.

10. The system of claim 9, wherein the control unit re-operates the water pump at a lowest rotation speed when coming into the secondary cooling mode and then re-operating the water pump.

11. The system of claim 10, wherein when the temperature of the battery is increased after entry into the secondary cooling mode, the control unit linearly and variably controls the rotation speed of the water pump in proportion to the temperature increase.

12. The system of claim 11, wherein when the water-cooled battery cooling device is turned off in a state in which the air conditioner is operating in the air conditioner mode and the water-cooled battery cooling device is in operation, the control unit comes into a primary release mode to turn off the water pump if the temperature of the battery is equal to or lower than a third battery reference temperature which is lower than the first battery reference temperature or if the temperature of the cooling water in the cooling water circulation line is equal to or lower than a second cooling water reference temperature which is lower than the first cooling water reference temperature, and then comes into a secondary release mode to reduce the rotation speed of the compressor of the air conditioner and to close the battery cooling expansion valve to stop cooling of the battery if a predetermined time is elapsed after entry into the primary release mode.

13. The system of claim 12, wherein the control unit executes control such that, when coming into the secondary release mode, an operation of reducing the rotation speed of the compressor of the air conditioner and an operation of closing the battery cooling expansion valve are sequentially performed with a predetermined time lag.

14. The system of claim 5, wherein when the water-cooled battery cooling device is turned on in a state in which the air conditioner is turned off, the control unit comes into a cooling mode to open the battery cooling expansion valve if the temperature of the battery is equal to or higher than the second battery reference temperature and if the temperature of the cooling water is equal to or higher than the first cooling water reference temperature, and then turns on the water pump of the cooling water circulation line and the compressor of the air conditioner with a predetermined time lag.

15. The system of claim 14, wherein when coming into the cooling mode, the control unit controls the compressor of the air conditioner at a predetermined target rotation speed and controls the water pump at a lowest rotation speed.

16. The system of claim 15, wherein when the temperature of the battery is increased after entry into the cooling mode, the control unit linearly and variably controls the rotation speed of the water pump in proportion to the temperature increase.

17. The system of claim 16, wherein when the water-cooled battery cooling device is turned off in a state in which the air conditioner is operating in an air conditioner mode regardless of cooling of the passenger compartment and the water-cooled battery cooling device is in operation, the control unit comes into the primary release mode to turn off the water pump if the temperature of the battery is equal to or lower than the third battery reference temperature or if the temperature of the cooling water in the cooling water circulation line is equal to or lower than the second cooling water reference temperature, and then comes into the secondary release mode to turn off the compressor of the air conditioner and to close the battery cooling expansion valve to stop cooling of the battery if a predetermined time is elapsed after entry into the primary release mode.

18. The system of claim 17, wherein the control unit executes control such that, when coming into the secondary release mode, an operation of turning off the compressor of the air conditioner and an operation of closing the battery cooling expansion valve are sequentially performed with a predetermined time lag.

19. The system of claim 1, wherein the air conditioner includes a first refrigerant line configured to cool or heat the passenger compartment, a second refrigerant line configured to divert a part of the refrigerant in the first refrigerant line, an expansion valve installed in the second refrigerant line, a refrigerant-cooling water heat exchanger installed in the second refrigerant line, a cooling water circulation line configured to transfer cold energy of the refrigerant to a specific device using the refrigerant-cooling water heat exchanger and a water pump configured to circulate cooling water through the cooling water circulation line, and

the air conditioning load change preventing unit includes a control unit configured to differently control an operation order of the expansion valve and the water pump according to an on/off operation of the compressor of the first refrigerant line.

20. The system of claim 19, wherein when the refrigerant is diverted to the second refrigerant line in a state in which the compressor is turned on, the control unit first operates the water pump of the cooling water circulation line and then operates the expansion valve.

21. The system of claim 20, wherein the control unit turns off the water pump before operating the expansion valve.

22. The system of claim 21, wherein the control unit controls an on/off operation of the water pump according to a temperature of the specific device.

23. The system of claim 19, wherein when the refrigerant is diverted to the second refrigerant line in a state in which the compressor is turned off, the control unit first operates the expansion valve and then operates the water pump.