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:
Jul. 12, 2005
Filed:
Jul. 09, 2003
Shunichi Aoyama, Kanagawa, JP;
Shinichi Takemura, Yokohama, JP;
Takanobu Sugiyama, Yokohama, JP;
Ryosuke Hiyoshi, Kanagawa, JP;
Toru Noda, Yokohama, JP;
Shunichi Aoyama, Kanagawa, JP;
Shinichi Takemura, Yokohama, JP;
Takanobu Sugiyama, Yokohama, JP;
Ryosuke Hiyoshi, Kanagawa, JP;
Toru Noda, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
In a compression ratio controlling apparatus and method for a spark-ignited internal combustion engine, the variable compression ratio mechanism is controlled by a compression controlling section on the basis of a detected engine speed and engine load in such a manner that the compression ratio is varied toward a target high compression ratio when the engine load falls in a predetermined low load region and toward a target low compression ratio when the engine load falls in a predetermined high load region and a predetermined delay is provided in a variation in the compression ratio toward one of the target high and low compression ratios in accordance with at least one of an engine driving history immediately before a transient state of a change in the engine load occurs and a wall temperature of a combustion chamber of the engine immediately before the transient state thereof occurs.