Cooling device for internal combustion engine

Patent metadata

Field	Value
Publication number	US-10508588-B2
Application number	US-201815960736-A
Country	US
Kind code	B2
Filing date	Apr 24, 2018
Priority date	Jun 5, 2017
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

A cooling device includes: an air blast passage; a heater core that is disposed in the air blast passage; an air blast volume adjusting member that is opened and closed to adjust an air blast volume which flows in the heater core; a flow rate adjuster that adjusts a flow rate of the coolant which is introduced into the heater core; and a controller. The controller sets the flow rate of the coolant which is adjusted by the flow rate adjuster to be less than a lower limit value of an adjustable range of the flow rate of the coolant which is adjusted by the flow rate adjuster in a vehicle compartment air-conditioning state in which the air blast volume adjusting member allows an air blast to flow to the heater core when the air blast volume adjusting member fully closes the heater core side of the air blast passage.

First claim

What is claimed is:

1. A cooling device for an internal combustion engine, comprising:
an air blast passage in which an air blast for air-conditioning a vehicle compartment flows;
a heater core that is disposed in the air blast passage and heats the air blast using a coolant which is introduced from the internal combustion engine as a heat source;
an air blast volume adjusting member that is opened and closed to adjust an air blast volume which flows in the heater core and an air blast volume which flows without passing through the heater core in the air blast passage;
a flow rate adjuster that adjusts a flow rate of the coolant which is introduced into the heater core;
an air conditioner including the air blast passage and the air blast volume adjusting member; and
a controller configured to set the flow rate of the coolant which is adjusted by the flow rate adjuster,
wherein the controller is configured to perform coolant stop control by setting the flow rate of the coolant which is adjusted by the flow rate adjuster to be less than a lower limit value of an adjustable range of the flow rate of the coolant which is adjusted by the flow rate adjuster in a vehicle compartment air-conditioning state in which the air blast volume adjusting member allows an air blast to flow to the heater core when the air blast volume adjusting member fully closes the heater core side of the air blast passage, and
wherein when an operating state of the air conditioner during a warming-up operation of the internal combustion engine is a cool MAX state, the controller is configured to continuously perform the coolant stop control until a coolant temperature reaches a first predetermined temperature, and when the operating state of the air conditioner during the warming-up operation of the internal combustion engine is a state other than the cool MAX state, the controller is configured to release the coolant stop control at a time point at which the coolant temperature reaches a second predetermined temperature.

2. The cooling device according to claim 1 , wherein the controller is configured to set the flow rate of the coolant which is adjusted by the flow rate adjuster to be equal to or greater than the lower limit value of the adjustable range of the flow rate of the coolant which is adjusted in the vehicle compartment air-conditioning state when the air blast volume adjusting member does not fully close the heater core side of the air blast passage during the warming-up operation of the internal combustion engine, and is configured to set the flow rate of the coolant which is adjusted by the flow rate adjuster to be less than the lower limit value of the adjustable range when the air blast volume adjusting member fully closes the heater core side of the air blast passage during the warming-up operation of the internal combustion engine.

3. The cooling device according to claim 2 , wherein the controller is configured to set the flow rate of the coolant which is adjusted by the flow rate adjuster to zero when the air blast volume adjusting member fully closes the heater core side of the air blast passage.

4. The cooling device according to claim 1 , wherein the controller is configured to set the flow rate of the coolant which is adjusted by the flow rate adjuster to zero when the air blast volume adjusting member fully closes the heater core side of the air blast passage.

5. The cooling device according to claim 1 , wherein the flow rate adjuster includes a rotary valve including a radiator port which communicates with a radiator cooling passage, a heater core port which communicates with a heater core coolant passage, and a device port which communicates with a device coolant passage, and
wherein opening ratios of the radiator port, the heater core port, and the device port vary based on a rotor phase of the rotary valve.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kaneko Rihito
• Takagi Noboru
• Hisaminato Naoto
• Yamaguchi Mitsuru
• Andoh Hirokazu
• Yamaguchi Masaaki
• Furuya Yoshihiro

Classifications

• F01P3/18

  Arrangements or mounting of liquid-to-air heat-exchangers (such arrangements on cylinders or cylinder heads F01P3/04; relative to vehicles B60K11/04) · CPC title

• F01P7/16 Primary

  by thermostatic control · CPC title

• F01P3/20 Primary

  Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence) · CPC title

• B60H1/00314

  Arrangements permitting a rapid heating of the heating liquid (B60H1/00492, B60H1/03 take precedence) · CPC title

• F01P2037/00

  Controlling · CPC title