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:
Sep. 05, 2006
Filed:
Nov. 10, 2004
Seiji Hirowatari, Toyota, JP;
Masanao Idogawa, Toyota, JP;
Seiji Hirowatari, Toyota, JP;
Masanao Idogawa, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A controller for controlling valve timing imbalance between cylinder groups of an engine. For each cylinder group, the controller has a variable mechanism for varying the valve timing. A lock mechanism locks the variable mechanism so as to maintain the valve timing of the cylinder group at a lock value. An ECU sets a valve timing target value based on the operating condition of the engine. The ECU and an oil control valve drive the variable mechanism. The ECU restricts the valve timing target value of at least one of the variable mechanisms of which operation is unlocked when the operation of at least one of the variable mechanisms is locked so that difference between the target value and the lock value decreases.