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:
Oct. 06, 1992
Filed:
Nov. 01, 1991
Hiroshi Komatsu, Yokohama, JP;
Makoto Nakamura, Yokohama, JP;
Kunifumi Sawamoto, Yokohama, JP;
Hiroyuki Itoyama, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A variable cam engine with a valve driven by cams which rotate in synchronism with the engine revolution comprises a power cam which provide large torque, an economy cam which provides good fuel cost performance, a setting device to set a cam change-over region according to an engine running condition, and a cam change-over mechanism which changes over from one cam to another at the set change-over regions and transmits the motion of the cam selected by the change-over to the valve. It further comprises a device to correct the throttle opening such that the torque generated before and after making a cam change-over is the same. It may further comprise a device to retard the engine ignition period at the same time as the throttle opening is corrected when the cam change-over is made. This arrangement prevents the occurrence of a torque step when a change-over is made from the power cam to the economy cam and vice versa, and prevents shock or impairment of exhaust gas composition due to the cam change-over.