US Patent 7146944 Valve timing controller

Patent 7146944 was granted and assigned to Denso on December, 2006 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Denso

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7146944

Date of Patent

December 12, 2006

Patent Application Number

10961038

Date Filed

October 12, 2004

Patent Primary Examiner

‌

Ching Chang

Patent abstract

The valve timing controller is driven by a motor. The valve controller has a control circuit and a driving circuit. The driving circuit receives a control signal generated by the control circuit and an engine rotation speed signal. The driving circuit supply a current to the motor to drive it based on the engine rotation speed represented by engine rotation speed signal and a target variation of the motor rotation speed represented by the control signal.