US Patent 7476176 Automatic transmission, dynamo-electric machine, and car

Patent 7476176 was granted and assigned to Hitachi on January, 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

7476176

Date of Patent

January 13, 2009

Patent Application Number

11490014

Date Filed

July 21, 2006

Patent Primary Examiner

‌

Tisha D Lewis

Patent abstract

An automatic transmission, wherein an electric motor is between a couple of clutch shafts of twin-clutch type automatic transmission. The torque and speed of the electric motor establishes a smooth and efficient gear shifting control, and enables a creep control, idling stop starting control, R-to-D, and D-to-R selecting control. As the friction control of the clutch is not performed, smooth gear shift work can be realized. The same control scheme allows creep control, idling stop starting control, R-to-D, and D-to-R selecting control to be enabled, which leads to such an effect that the life is extended without the clutch being worn away.