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:
Nov. 03, 1992
Filed:
Sep. 30, 1991
Masashi Sugiuchi, Yokohama, JP;
Hiroshi Kamiyama, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohoma, JP;
Abstract
A variable cam engine comprises a low speed power cam arranged so as to generate high power at low engine speeds, a high speed power cam arranged so as to generate high power at high engine speeds, and an economy cam arranged so as to give good fuel cost performance. The engine is provided with a device for detecting the running condition of the engine, a device for identifying a target cam from among the cams depending on the running condition of the engine, a device for identifying a present cam, a device for selecting either the target cam or another cam depending on whichever gives the smaller torque step with respect to the present cam, and a device for transmitting the motion of the cam selected to a valve. In the above construction, when there is a large torque step between the present cam and the target cam, cams can be changed over via a cam intermediate between the two. The torque step when the cams are changed over is therefore reduced, and the change-over to the target cam proceeds smoothly.