The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2004
Filed:
Jun. 10, 2002
Hiromichi Murakami, Nishikasugai-gun, JP;
Daisuke Yamamoto, Komaki, JP;
Shigetaka Yoshikawa, Nishikamo-gun, JP;
Yoshikazu Shinpo, Nissin, JP;
Isao Takagi, Okazaki, JP;
Other;
Abstract
An engine cooling system controls a cooling degree of an engine according to an operating condition thereof by circulating cooling water through the engine. This system is provided with a water temperature sensor for detecting a cooling water temperature THW , a flow rate regulating valve for regulating a circulation flow rate of the cooling water, and an electronic control unit (ECU) for controlling the valve . The ECU sets a non-control region and a first and second control regions, each centering on a target water temperature to be calculated according to operating conditions of the engine . The ECU controls the valve to open and close at a high speed when the cooling water temperature THW is in the second control region, thereby to allow the cooling water temperature to approach the first control region or at a low speed when the cooling water temperature THW is in the first control region, thereby to allow the cooling water temperature to approach the non-control region, or holds the valve at a current opening degree when the cooling water temperature THW is in the non-control region.