US Patent 7594487 Apparatus for and method of controlling motion mechanism

Patent 7594487 was granted and assigned to Hitachi on September, 2009 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Hitachi

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7594487

Date of Patent

September 29, 2009

Patent Application Number

11657729

Date Filed

January 25, 2007

Patent Primary Examiner

‌

Ching Chang

Patent abstract

A variable valve mechanism, which rotates a control shaft by means of an actuator to continuously change a lift amount of an engine valve, is configured in a manner such that when a sensor output in response to a minimum valve lift position defined by a stopper capable of restricting the rotation of the control shaft, is detected, a manipulated variable for the actuator is restricted so as to restrict a pressing force by the stopper, and also an angular speed of the control shaft toward the minimum valve lift position, to thereby reduce an inertia force of the control shaft.