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:
Apr. 17, 2001
Filed:
Feb. 04, 2000
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
When the valve operating characteristic changing control for converging the deviation between the actual cam phase and the target cam phase of the internal combustion engine is carried out, the responsiveness and the convergence can be reconciled independent of the operational state of the internal combustion engine. A valve operating characteristic changing mechanism capable of continuously controlling the cam phase is provided at an end of a cam shaft, driven through a crankshaft by a timing chain. When the deviation between a target cam phase and an actual cam phase is equal to or smaller than a threshold value, the valve operating characteristic changing mechanism is controlled in a feedback manner. When the deviation exceeds the threshold value, the valve operating characteristic changing mechanism is controlled in a feed-forward manner with a basic operational amount, thereby reconciling a responsiveness and a convergence. By increasing the basic operational amount as the cooling-water temperature becomes higher or as the deviation becomes larger, it is possible to further enhance the convergence in the feed-forward control.