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:
Jul. 04, 2017
Filed:
May. 27, 2014
Shunsuke Yamamoto, Chiryu, JP;
Toyokazu Nakashima, Mie-ken, JP;
Shunsuke Yamamoto, Chiryu, JP;
Toyokazu Nakashima, Mie-ken, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, JP;
Abstract
A control device for an engine includes a variable valve timing mechanism. The control device performs learning a holding control amount of a hydraulic valve when actual valve timing is held at a fixed timing in each of spring and non-spring regions, and an updating. The updating includes updating the control amount for the non-spring region whenever the control amount for the spring region learned drops below the control amount for the non-spring region to satisfy a relationship with the control amount for the non-spring region being less than or equal to the control amount for the spring region, and/or updating the control amount for the spring region whenever the control amount for the non-spring region learned exceeds the control amount for the spring region to satisfy a relationship with the control amount for the spring region being greater than or equal to the control amount for the non-spring region.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile