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. 18, 1997
Filed:
May. 16, 1996
Masaaki Shinojima, Kariya, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
The rotational phase difference between an engine crankshaft and an engine cam shaft, and a mechanism which controls the difference between the two is controlled using closed-loop feedback. The close-loop feedback has a learning function so that the rotational phase difference between the crankshaft and the cam shaft converges on a target value. The learning process uses retaining outputs based on the engine operational state to compensate the degree of actuation of the rotational phase adjusting mechanism with the value thus learned. The deviation relative to the retaining output from a map based on a variation speed at each rotational phase difference, and this deviation is added to a delay output of the feedback loop at each iteration.