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, Sam 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.
Claims6
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.
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;
- monitoring operator inputs;
- monitoring a transmission output;
- and
- terminating engine operation in the closed-loop speed control mode when a time-rate change in the transmission output exceeds a threshold absent a corresponding change in the monitored operator inputs.
Dependencies are inferred from the claim text.