Cooling System for Internal Combustion Engine, and Control Method Thereof

Patent metadata

Field	Value
Publication number	US-2018080366-A1
Application number	US-201615563654-A
Country	US
Kind code	A1
Filing date	Mar 29, 2016
Priority date	Apr 3, 2015
Publication date	Mar 22, 2018
Grant date	—

Abstract

The present invention provides a cooling system for an internal combustion engine, comprising: a flow channel switching valve for switching between a plurality of cooling water channels at least including a heater line for air heating, a block line for cooling an engine block, and a transmission line for an oil warmer of a transmission so as to sequentially open at least one of the plurality of cooling water channels in accordance with a warm-up state of the internal combustion engine; and a control device for controlling opening and closing of the flow channel switching valve so as to restrict a cooling water distribution rate of the heater line. The cooling system allows acceleration of cooling water temperature recovery from a temporary drop.

First claim

1 .- 6 . (canceled)

7 . A cooling system for an internal combustion engine, comprising:
a flow channel switching valve for switching between a plurality of cooling water channels at least including a heater line for air heating, a block line for cooling an engine block, and a transmission line for an oil warmer of a transmission so as to sequentially open at least one of the plurality of cooling water channels in accordance with a warm-up state of the internal combustion engine; and a control device for controlling opening and closing of the flow channel switching valve so as to restrict a cooling water distribution rate of the heater line while maintaining a flow rate of cooling water through the transmission line unchanged, when the transmission line opens.

8 . The cooling system for the internal combustion engine according to claim 7 , wherein the control device maintains the flow rate of cooling water through the transmission line unchanged by adjusting an opening degree of the flow channel switching valve to the heater line and the transmission line.

9 . The cooling system for the internal combustion engine according to claim 7 , wherein the control device an electric water pump to restrict a discharge flow rate of the electric water pump for supplying cooling water to the plurality of cooling water channels.

10 . The cooling system for the internal combustion engine according to claim 7 , wherein the control device controls the opening and closing of the flow channel switching valve so as to change a flow rate of cooling water through the heater line based on various information on an air conditioning system including temperature information from temperature sensors installed at different locations in a vehicle.

11 . The cooling system for the internal combustion engine according to claim 7 , wherein
the flow channel switching valve is a rotary value including a stator having an outlet port and a plurality of inlet ports corresponding to the plurality of cooling water channels, and a rotor having flow channels therein and rotatably fitted in the stator, and the flow channels of the rotor is formed so as to allow opening ratios of the plurality of inlet ports to change as a rotation angle of the rotor increases such that, when the transmission line opens, the cooling water distribution rate of the heater line is restricted while the flow rate of cooling water through the transmission line is maintained unchanged.

12 . A method for controlling a cooling system for an internal combustion engine, the cooling system including a flow channel switching valve for switching between a plurality of cooling water channels at least including a heater line for air heating, a block line for cooling an engine block, and a transmission line for an oil warmer of a transmission so as to sequentially open at least one of the plurality of cooling water channels in accordance with a warm-up state of the internal combustion engine; and a control device, the method causing the control device to control opening and closing of the flow channel switching valve so as to control cooling water distribution rates of the plurality of cooling water channels,
wherein the control device controls the opening and closing of the flow channel switching valve so as to restrict a cooling water distribution rate of the heater line while maintaining a flow rate of cooling water through the transmission line unchanged, when the transmission line opens.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Toyama Yuichi
• Murai Atsushi
• Sakaguchi Shigeyuki

Classifications

• F16H57/0413

  Controlled cooling or heating of lubricant; Temperature control therefor · CPC title

• F01P3/20 Primary

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

• F16H57/0475

  Engine and gearing, i.e. joint lubrication or cooling or heating thereof · CPC title

• F01P5/12

  Pump-driving arrangements · CPC title

• F01P7/16

  by thermostatic control · CPC title