Control method for integrated thermal management system of vehicle

Patent metadata

Field	Value
Publication number	US-11085354-B2
Application number	US-201916591308-A
Country	US
Kind code	B2
Filing date	Oct 2, 2019
Priority date	May 17, 2019
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A control method for an integrated thermal management system of a vehicle includes: comparing an engine coolant temperature with a predetermined first set temperature after vehicle start; when the engine coolant temperature is greater than the first set temperature, comparing an ambient temperature with a set ambient temperature and comparing an air conditioner refrigerant pressure with a set pressure; and when the ambient temperature is greater than the set ambient temperature and the air conditioner refrigerant pressure is greater than the set pressure, controlling opening and closing operations of an integrated flow control valve based on the air conditioner refrigerant pressure so as to increase a flow rate of coolant that is supplied to a radiator through the integrated flow control valve.

First claim

What is claimed is:

1. A control method for an integrated thermal management system of a vehicle, the method comprising:
comparing, by a controller, an engine coolant temperature with a predetermined first set temperature after vehicle start;
when the engine coolant temperature is greater than the first set temperature, comparing, by the controller, an ambient temperature with a set ambient temperature and comparing, by the controller, an air conditioner refrigerant pressure with a set pressure; and
when the ambient temperature is greater than the set ambient temperature and the air conditioner refrigerant pressure is greater than the set pressure, controlling, by the controller, opening and closing operations of an integrated flow control valve based on the air conditioner refrigerant pressure so as to increase a flow rate of coolant that is supplied to a radiator through the integrated flow control valve.

2. The method of claim 1 , wherein in comparing the ambient temperature with the set ambient temperature and comparing the air conditioner refrigerant pressure with the set pressure, it is determined that an air conditioning blower is in an on-state, and
when the ambient temperature is greater than the set ambient temperature, the air conditioner refrigerant pressure is greater than the set pressure, and the air conditioning blower is in the on-state, in controlling the opening and closing operations of the integrated flow control valve based on the air conditioner refrigerant pressure, the opening and closing operations of the integrated flow control valve are controlled based on the air conditioner refrigerant pressure.

3. The method of claim 2 , further comprising:
when any one of a condition that the ambient temperature is greater than the set ambient temperature, a condition that the air conditioner refrigerant pressure is greater than the set pressure, and a condition that the air conditioner blower is in the on-state is not fulfilled,
controlling the opening and closing operations of the integrated flow control valve based on the engine coolant temperature.

4. The method of claim 3 , wherein in the controlling the opening and closing operations of the integrated flow control valve based on the engine coolant temperature, when the engine coolant temperature is in a range of greater than a second set temperature and less than a third set temperature, the opening and closing operations of the integrated flow control valve are controlled to allow the coolant to be supplied to an automatic transmission fluid (ATF) warmer in which the coolant is heat-exchanged with transmission oil, and a flow rate of the coolant supplied to the ATF warmer is controlled based on the engine coolant temperature.

5. The method of claim 4 , wherein in controlling the opening and closing operations of the integrated flow control valve based on the engine coolant temperature, when the engine coolant temperature is in a range of greater than a fourth set temperature and less than a fifth set temperature, control of the opening and closing operations of the integrated flow control valve is performed such that the engine coolant temperature follows a target coolant temperature for operating an engine at an engine operating point.

6. The method of claim 5 , wherein in controlling the opening and closing operations of the integrated flow control valve based on the engine coolant temperature, when the engine coolant temperature is greater than or equal to the fifth set temperature, the opening and closing operations of the integrated flow control valve are controlled to allow the cooling water to be supplied to the radiator, and the flow rate of the coolant supplied to the radiator is controlled based on the engine coolant temperature.

7. The method of claim 2 , wherein in controlling the opening and closing operations of the integrated flow control valve based on the air conditioner refrigerant pressure, the opening ratio of the integrated flow control valve is controlled to be increased when the air conditioner refrigerant pressure rises so as to increase the flow rate of the coolant that is supplied to the radiator.

8. The method of claim 1 , wherein in controlling the opening and closing operations of the integrated flow control valve based on the air conditioner refrigerant pressure, the opening ratio of the integrated flow control valve is controlled to be increased when the air conditioner refrigerant pressure rises so as to increase the flow rate of the coolant that is supplied to the radiator.

9. The method of claim 1 , wherein in comparing the engine coolant temperature with the predetermined first set temperature after the vehicle start, when the engine coolant water temperature is less than or equal to the first set temperature, the opening and closing operations of the integrated flow control valve are controlled to allow the coolant to be supplied to an exhaust heat recovery system, such that the coolant is heated in the exhaust heat recovery system by heat exchange with exhaust gas and then is supplied to an engine for engine warm-up.

10. A non-transitory computer readable medium containing program instructions executed by a processor, the computer readable medium comprising:
program instructions that compare an engine coolant temperature with a predetermined first set temperature after vehicle start;
program instructions that, when the engine coolant temperature is greater than the first set temperature, compare an ambient temperature with a set ambient temperature and compare an air conditioner refrigerant pressure with a set pressure; and
program instructions that, when the ambient temperature is greater than the set ambient temperature and the air conditioner refrigerant pressure is greater than the set pressure, control opening and closing operations of an integrated flow control valve based on the air conditioner refrigerant pressure so as to increase a flow rate of coolant that is supplied to a radiator through the integrated flow control valve.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Lee Jang Hyo

Classifications

• F01P2037/02

  starting · CPC title

• F01P2025/13

  Ambient temperature · CPC title

• B60H1/00271

  HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit · CPC title

• F01P2060/045

  for transmissions · CPC title

• B60H2001/3255

  related to temperature · CPC title