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:
Dec. 31, 2002
Filed:
Jun. 28, 2001
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A valve timing control system for accelerating activation of a catalytic converter in an internal combustion engine in a cold starting operation mode. The system includes actuators ( ) coupled to cam shafts ( C, C), hydraulic pressure supply units ( ) for driving the actuators ( ), and a controller ( A) for controlling a hydraulic pressure for the actuators ( ) in dependence on engine operation states to change phase of the cam shafts ( C; C) relative to a crank shaft. The actuator ( ) includes a locking mechanism ( ) for setting the relative phase to a lock-up position, and an unlocking mechanism ( ) for releasing the locking mechanism in En response to a predetermined hydraulic pressure. The controller ( A) sets the relative phase to the lock-up position in a starting operation, while controlling the relative phase to be advanced in an engine state succeeding to the starting operation.