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:
Feb. 18, 2003
Filed:
Jul. 26, 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 while enhancing control accuracy by learning a reference position of a cam angle. The system includes actuators ( ) coupled to cam shafts ( C; C), respectively, hydraulic pressure supply means ( ) for driving the actuators ( ), and a controller ( A) for controlling hydraulic pressure fed to the actuators ( ) in dependence on engine operation states to change phases of the cam shafts ( C; C) relative to a crank shaft ( C). The controller ( A) is so designed as to set a valve timing to a most advanced position or alternatively to a most retarded position in a cold-state idling operation mode for the purpose of learning a reference position.