Method and apparatus to detect a mode-gear mismatch during operation of an electro-mechanical transmission
AssigneeGM Global Technology Operations LLC
InventorsRyan D. Martini, Charles J. Van Horn, Peter E. Wu, Andrew M. Zettel, Osama Almasri, Jy-Jen F. Sah
Life of this patent
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Abstract
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.
Claims5
Method for operating a vehicular powertrain including an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine, said electro-mechanical transmission selectively operative in one of a plurality of continuously variable and fixed gear operating range states, the method comprising:
- commanding operation of the electro-mechanical transmission in one of the continuously variable operating range states;
- commanding operation of the engine in a closed-loop speed control mode, the closed-loop speed control mode always comprises operation of the engine;
- monitoring operator inputs;
- monitoring a transmission output shaft speed measured by a transmission output speed sensor;
- and
- terminating operation of the engine in the closed-loop speed control mode when a time-rate change in the transmission output shaft speed exceeds a threshold absent a change in the monitored operator inputs.
Method for operating a vehicular powertrain including an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine, the method comprising:
- 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;
- wherein monitoring operator inputs comprises monitoring an operator brake input, and a change in the monitored operator inputs comprises an operator command for braking.
Method to control operation of a powertrain comprising an engine mechanically-operatively coupled to an electro-mechanical transmission selectively operative in one of a fixed gear and a continuously variable operating range state, comprising:
- operating the transmission in the continuously variable operating range state;
- operating the engine in a closed-loop speed control mode, the closed-loop speed control mode always comprises operation of the engine;
- monitoring operator inputs;
- monitoring a transmission output shaft speed measured by a transmission output speed sensor;
- and
- terminating engine operation in the closed-loop speed control mode when a time-rate change in the transmission output shaft speed exceeds a threshold absent a corresponding change in the monitored operator inputs.
Dependencies are inferred from the claim text.