Gm Global Technolgoy Operations, Inc.

Osama Almasri

Jy-Jen F Sah

Andrew M Zettel

Peter E Wu

Ryan D Martini

Charles J Van Horn

Hanne Buur

Syed Naqi

A vehicular powertrain includes an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine. A method for operating the powertrain includes monitoring operator inputs, monitoring a transmission output, and terminating an engine operating mode when a time-rate change in the transmission output exceeds a threshold absent a change in the monitored operator inputs.

Method and apparatus to detect a mode-gear mismatch during operation of an electro-mechanical transmission

A system for robust fault detection in an electrically variable, hydraulically controlled transmission includes independently monitoring hydraulic pressure within a hydraulic control circuit and electric machine rotation for detecting clutch state faults.

Electro-mechanical transmission control system

Control of operation of a hybrid powertrain is provided, wherein mechanical power flow to an output is controlled through selective actuation of torque-transfer clutches. Electric machines are coupled to an energy storage system for electric power flow. The electro-mechanical transmission is operated in a continuously variable operating range state, and, operation of the transmission is monitored. Absence of a mismatch between the commanded continuously variable operating range state and an actual operating state of the transmission is determined. Presence of a mismatch between the commanded operating range state and the actual operating state of the transmission may be determined. Operation of the powertrain is modified when a mismatch between the commanded operating range state and the actual operating state of the transmission is detected.

Method and apparatus to detect a mode-gear mismatch during steady state operation of an electro-mechanical transmission

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Novi, MI, United States of America

Osama Almasri