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AssigneeGM Global Technology Operations LLC
InventorsJy-Jen F. SAH, Lan WANG, Paul A. STANOWSKI, Neal A. CHAPERON
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A hybrid powertrain includes and internal combustion engine, an energy storage device, an electro-mechanical transmission having at least one electric machine rotatably coupled to the engine. The electro-mechanical transmission is selectively controllably operative to transmit torque among the engine and the at least one electric machine. A method to start operation of the internal combustion engine includes initiating rotation of a crankshaft of the engine with the at least one electric machine until a first predetermined crankshaft speed is achieved, firing the engine while controlling engine speed with the at least one electric machine until a flare threshold occurs, controlling the engine speed without any interaction from the at least one electric machine based on controlling combustion parameters of the engine, and when a predetermined condition occurs, controlling the engine speed with the at least one electric machine while the engine is still firing.
Method to start operation of an internal combustion engine of a hybrid powertrain, the hybrid powertrain comprising the engine, an energy storage device, an electro-mechanical transmission including at least one electric machine rotatably coupled to the engine, the electro-mechanical transmission selectively controllably operative to transmit torque among the engine and the at least one electric machine, comprising:
Method to start operation of an internal combustion engine of a hybrid powertrain, the hybrid powertrain comprising the engine, a battery, an electro-mechanical transmission including at least one electric machine rotatably coupled to the engine, the electro-mechanical transmission selectively controllably operative to transmit torque among the engine and the at least one electric machine, comprising:
The method of claim 12 wherein the at least one electric machine comprises a first electric machine and a second electric machine, each of the first and second electric machines rotatably coupled to the engine.
The method of claim 12 further comprising:
The method of claim 12 wherein said battery comprises a lithium ion battery.
The method of claim 12 wherein controlling the engine speed without any interaction from the at least one electric machine comprises the at least one electric machine freewheeling in a relaxed state.
The method of claim 12 further comprising:
The method of claim 12 wherein controlling the engine speed without any interaction from the at least one electric machine comprises reducing engine speed flare based on controlling at least one of the spark induced torque of the engine and the airflow torque of the engine when a second predetermined crankshaft speed is achieved.
Dependencies are inferred from the claim text.