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:
Mar. 02, 2010
Filed:
Oct. 10, 2007
Shunichi Aoyama, Kanagawa, JP;
Katsuya Moteki, Tokyo, JP;
Kenshi Ushijima, Kanagawa, JP;
Shinichi Takemura, Yokohama, JP;
Hideaki Mizuno, Yokohama, JP;
Shunichi Aoyama, Kanagawa, JP;
Katsuya Moteki, Tokyo, JP;
Kenshi Ushijima, Kanagawa, JP;
Shinichi Takemura, Yokohama, JP;
Hideaki Mizuno, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama-shi, JP;
Abstract
In a reciprocating piston engine employing a variable compression ratio mechanism linked to a reciprocating piston for variably adjusting a geometrical compression ratio by varying at least a piston top dead center position, so that the top dead center position obtained at a low geometrical compression ratio is set to be lower than that at a high geometrical compression ratio, responsively to a controlled variable, a controller is configured to set a target compression ratio to a high value at low engine load operation, and to a relatively low value at high engine load operation. A substantially entire area of a crown of the piston, defining a part of a wall surface of a combustion chamber, is formed of a non-metallic material having a higher heat-insulating and heat-reserving property as compared to a base structural material of each of the combustion chamber and the piston.