Gm Global Technolgoy Operations, Inc.

Darren Crewes

Brian A Welchko

Jy-Jen F Sah

Andrew M Zettel

Wei D Wang

Peter E Wu

Ryan D Martini

Syed Naqi

Charles J Van Horn

Kevin P Houle

Thomas E Mathews

A method to control a powertrain having an electric motor includes monitoring a torque command to the motor, predicting a motor torque for the motor based upon the torque command, monitoring an actual motor torque of the motor, comparing the actual motor torque to the predicted torque, and indicating a motor fault when the actual motor torque and the predicted torque differ by more than a calibratable threshold.

Robust motor torque performance diagnostics algorithm for electric drive systems in hybrid vehicles

Monitoring operation of an electro-mechanical transmission having a hydraulic circuit with flow management valves and pressure control solenoids to actuate clutches and pressure monitoring devices to monitor the hydraulic circuit is provided. The transmission operates in fixed gear and continuously variable operating range states. The method comprises controlling position of one of the flow management valves to control operation in one of the operating range states. A fault is detected in the one of the flow management valves based upon outputs of the pressure monitoring devices during steady state operation in one of the continuously variable operating range states. A fault is detected in the one of the flow management valves based upon the output of one of the pressure monitoring devices during a transition in the flow management valve.

Method and apparatus to monitor a valve adapted to control mode to gear transitions during operation of an electro-mechanical transmission

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West Bloomfield, MI, United States of America

Darren Crewes