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:
May. 05, 2009
Filed:
Jul. 09, 2007
Mitsuo Kadota, Wako, JP;
Kensaku Yamamoto, Wako, JP;
Mitsuo Kadota, Wako, JP;
Kensaku Yamamoto, Wako, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
In an internal combustion engine variable compression ratio system, a compression ratio of an internal combustion engine is changed over between a high compression ratio and a low compression ratio with a changeover threshold value corresponding to a predetermined operational condition of the internal combustion engine being a boundary. When the internal combustion engine enters a slow acceleration state or a slow deceleration state, a changeover is performed first and then the state is maintained for a predetermined period by prohibiting re-changeover. Therefore, changeover hunting can be prevented in the system while maintaining an appropriate compression ratio in conformity with traveling characteristics demanded by a driver, when the internal combustion engine in a state of slow acceleration or slow deceleration.