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. 23, 1993
Filed:
Nov. 26, 1991
Kenji Ikeura, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A variable cam engine wherein each cylinder has at least one valve driven by a multiplicity of cams which give different engine torque outputs. The engine includes a decision-making device which decides change-over of the cams along with a selection of a target cam according to the engine running conditions, a cam change-over mechanism which disengages a current cam from the valve and engages the target cam instead, a measuring device to measure engine parameters having a correlation with the cam change-over, a determining device to determine that a cam change-over has occurred by comparing these parameters with previously set values, and a regulating device which regulates combustion in the corresponding cylinder according to the cam change-over determined by the determining device. The fuel supply quantity and ignition period corresponding to the cam which is actually selected are thereby regulated for each cylinder, a torque step due to the cam change-over is avoided so that the change-over takes place smoothly, and degradation of the exhaust gas composition is prevented.