Cooling control system and cooling control method for engine
US6223700A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1998 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Jun 24, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01P2070/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system is provided wherein temperature conduction upon the changing of temperature of cooling water in an engine is forecast, and achievement of a cooling control system with an improved life and reliability and a reduction in cost results therefrom. A butterfly valve for regulating the flow of cooling water is rotatably controlled through a DC motor, a clutch mechanism 33 and a deceleration mechanism 33 so as to cool the engine at an appropriate temperature. A PWM signal generated by a quick response control and a PI control on the basis of at least load information of the engine is supplied to the DC motor 31 from ECU, whereby the butterfly valve 34b is rotatably controlled. A butterfly valve adjusting the flow of cooling water is controlled with the degree of valve opening by a thermo-element enclosing a thermal expansive body such as wax. A PTC heater is placed in proximity with the thermo-element, and supplied with current for heating on the basis of operation parameters of an engine to control the cooling efficiency of the cooling water. As a consequence, the characteristics of the butterfly valve which is capable of extremely decreasing rotation torque for adjusting the fl…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.