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Method for use of hydraulically or electrically controlled solenoids under failed on conditions

United States Patent

July 8, 2014
View the Complete Patent at the US Patent & Trademark Office
A method to operate a clutch device in an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and at least one electric machine includes, in response to a failure condition detected within a flow control device configured to facilitate flow of hydraulic fluid for operating the clutch device, selectively preventing the flow of hydraulic fluid from entering the flow control device and feeding the clutch device. Synchronization of the clutch device is initiated when the clutch device is intended for activation, and only if the clutch device is synchronized, the flow of hydraulic fluid is selectively permitted to enter the flow control device to activate the clutch device.
Bolenbaugh; Jonathan M. (Ann Arbor, MI), Naqi; Syed (Dearborn, MI)
GM Global Technology Operations LLC (Detroit, MI)
13/ 534,345
June 27, 2012
GOVERNMENT CONTRACT RIGHTS This invention was made with U.S. Government support under Agreement No. DE-FC26-08NT04386 awarded by the U.S. Department of Energy. The U.S. Government may have certain rights in this invention.