Cooling apparatus of internal combustion engine

Patent metadata

Field	Value
Publication number	US-2018298807-A1
Application number	US-201815937534-A
Country	US
Kind code	A1
Filing date	Mar 27, 2018
Priority date	Apr 13, 2017
Publication date	Oct 18, 2018
Grant date	—

Abstract

The cooling apparatus of the internal combustion engine according to the invention executes an incompletely-warmed state control for supplying the cooling water to the cylinder block water passage from the cylinder head water passage without flowing the cooling water through the radiator and supplying the cooling water to the cylinder head water passage from the cylinder block water passage when the temperature of the cooling water is lower than the engine completely-warmed water temperature at which the engine is estimated to be warmed completely.

First claim

What is claimed is:

1 . A cooling apparatus of an internal combustion engine, comprising:
a head water passage provided in a cylinder head of the internal combustion engine, through which cooling water for cooling the cylinder head flows; a block water passage provided in a cylinder block of the internal combustion engine, through which the cooling water for cooling the cylinder block flows; a radiator for cooling the cooling water; and an electronic control unit for controlling a flow of the cooling water supplied to the head and block water passages, wherein the electronic control unit is configured to:
execute an incompletely-warmed state control for supplying the cooling water to the block water passage from the head water passage without flowing the cooling water through the radiator and supplying the cooling water to the head water passage from the block water passage when a temperature of the cooling water is lower than an engine completely-warmed water temperature at which the engine is estimated to be warmed completely; and
execute a completely-warmed state control for supplying the cooling water to the head and block water passages from the head and block water passages through the radiator when the temperature of the cooling water is equal to or higher than the engine completely-warmed water temperature.

2 . The cooling apparatus according to claim 1 , wherein the electronic control unit is configured to:
execute a cool state control as the incompletely-warmed state control for supplying a first amount of the cooling water to the block water passage from the head water passage without flowing the cooling water through the radiator, supplying the remaining amount of the cooling water to the clock water passage from the head water passage through the radiator, and supplying the cooling water to the head water passage from the block water passage when the temperature of the cooling water is lower than a semi-warmed water temperature lower than the engine completely-warmed water temperature; and execute a semi-warmed state control as the incompletely-warmed state control for supplying a second amount of the cooling water to the head water passage from the head water passage through the radiator, supplying the remaining amount of the cooling water to the block water passage from the head water passage without flowing the cooling water through the radiator, and supplying the cooling water to the head water passage from the block water passage when the temperature of the cooling water is equal to or higher than the semi-warmed water temperature, the second amount being larger than the first amount.

3 . The cooling apparatus according to claim 2 , wherein the electronic control unit is configured to execute the semi-warmed state control to control a flow rate of the cooling water in the block water passage such that the flow rate of the cooling water in the block water passage is small when a difference in the temperature of the cooling water between after and before the cooling water flows through the block water passage, is small, compared with when the difference in the temperature of the cooling water is large.

4 . The cooling apparatus according to claim 1 , wherein the cooling apparatus comprises a pump and a switching valve configured to be selectively set to any of a normal flow position for supplying the cooling water to the block water passage from the pump and an opposite flow position for supplying the cooling water to the pump from the block water passage, and
the electronic control unit is configured to:
set the switching valve to the opposite flow position when the incompletely-warmed state control is executed; and
set the switching valve to the normal flow position when the completely-warmed state control is executed.

Assignees

• Toyota Motor Co Ltd

Inventors

• Sugihara Hiroyuki
• Miyoshi Yuji

Classifications

• F01P2025/33

  Cylinder head temperature · CPC title

• F01P2003/021

  Cooling cylinders · CPC title

• F01P5/10

  Pumping liquid coolant; Arrangements of coolant pumps · CPC title

• F01P2003/028

  Cooling cylinders and cylinder heads in series · CPC title

• F02F7/007

  Adaptations for cooling · CPC title