Cooling system controller for internal combustion engines

• US 4,726,325 A
• Filed: 03/30/1987
• Issued: 02/23/1988
• Est. Priority Date: 03/28/1986
• Status: Expired due to Term

• Current Assignee: Aisin Seiki Kabushiki Kaisha 1 2-Chome Asahi-Machi Kariya City Aichi PREF Japan
• Original Assignee: Aisin Seiki Kabushiki Kaisha
• Inventors: Itakura, Masato
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Application Number:
  US07/031,669
• Time in Patent Office: 330 Days
• Field of Search: 123/41.08, 123/41.09, 123/41.1, 123/41.02, 123/41.44, 123/41.82 R, 123/41.29
• US Class Current: 123/41.1
• CPC Class Codes: F01P 2003/027 Cooling cylinders and cylinder heads in parallel
• CPC Class Codes: F01P 2003/185 arranged in parallel
• CPC Class Codes: F01P 2007/146 using valves
• CPC Class Codes: F01P 2025/13 Ambient temperature
• CPC Class Codes: F01P 2025/30 Engine incoming fluid temperature
• CPC Class Codes: F01P 2025/31 Cylinder temperature
• CPC Class Codes: F01P 2025/33 Cylinder head temperature
• CPC Class Codes: F01P 2025/50 using two or more temperature sensors
• CPC Class Codes: F01P 2025/62 Load
• CPC Class Codes: F01P 2025/64 Number of revolutions
• CPC Class Codes: F01P 2025/66 Vehicle speed
• CPC Class Codes: F01P 2031/30 Cooling after the engine is stopped
• CPC Class Codes: F01P 7/048 using electrical drives
• CPC Class Codes: F01P 7/164 by varying pump speed
• CPC Class Codes: F01P 7/165 characterised by systems with two or more loops
• CPC Class Codes: F01P 7/167 by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed

Abstract

A cooling control system for internal combustion engines having two circuits of cooling water for cylinder head side and cylinder block side, each of two circuits being provided with a radiator, a water jacket, a water pump, a conduit, a return passageway, a by-pass passageway, a mixing valve device, and a motor fan; said water pump being driven by a rotation-controllable electric motor, said valve device being driven by a DC motor or a stepping motor which is controlled by a control unit operating by receiving signals on various vehicle running conditions, thereby making it possible to perform the optimum water distribution according to various vehicle running conditions under the high accuracy of control.

Claims

1. A cooling control system for internal combustion engines comprising:

a first radiator and a second radiator,

a first water jacket provided to a cylinder head,

a second water jacket provided to a cylinder block,

a first water pump and a second water pump, being provided respectively at a position close to an inlet port at the upper-stream side of said first or second water jacket,

a first conduit and a second conduit, connecting respectively an outlet port of said first or second water jacket to an inlet port of said first or second radiator,

a first return passageway and a second return passageway, connecting respectively an outlet port of said first or second raditor to said first or second water pump,

a first by-pass passageway and a second by-pass passageway, being respectively branched from said first or second conduit and communicating with said first or second return passageway,

a first mixing valve device and a second mixing valve device, being positioned at the junction of said first or second by-pass passageway with said first or second return passageway, mixing water flows from said two passageways and returning it to said first or second water pump,

a first motor fan and a second motor fan, sending cooled air to said first or second radiator respectively,

each of said first and second water pumps being driven by an electric motor of which the rotation frequency is controllable,

a valve equipped to each of said first and second mixing valve devices for determining the mixing ratio of water being driven by a direct current motor or a stepping motor, and

rotation control of all said motors being performed by a control unit which operates by receiving the signals of engine rotation frequency, vehicle speed, suction force of suction pipe, temperature at the inlet ports of said first and second water jackets and ambient air temperature.