Hybrid vehicle powertrain control during loss of motor speed feedback
AssigneeFord Global Technologies, LLC
InventorsRajit Johri, Fazal Urrahman Syed
Life of this patent
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Abstract
Propulsion for a vehicle is provided by a hybrid powertrain that includes a torque converter coupled to an electric machine and selectively coupled to an engine. The hybrid powertrain further includes a controller programmed to, responsive to a loss of speed feedback of the electric machine while the engine is disconnected from the torque converter and the torque converter is open, operate one or more of a gearbox, the electric machine, and the engine based on an impeller speed of the torque converter derived from a torque of the electric machine and a speed of the vehicle.
Claims20
A hybrid powertrain comprising:
- a torque converter coupled to an electric machine and a gearbox and selectively coupled to an engine;
- and a controller programmed to, responsive to a loss of electric machine speed feedback while the engine is decoupled and the torque converter is open, shift the gearbox based on an estimate of an impeller speed of the torque converter, the estimate derived from a torque of the electric machine and a turbine speed of the torque converter.
A vehicle comprising:
- a torque converter coupled to an electric machine and selectively coupled to an engine;
- and a controller programmed to operate the electric machine based on an estimate of a torque converter impeller speed and change, responsive to the engine being decoupled and a loss of electric machine speed feedback, the estimate from being based on electric machine speed feedback to being based on an electric machine torque and a vehicle speed.
A method comprising:
- shifting a gearbox, coupled to an output of a torque converter that is further coupled to an electric machine and selectively coupled to an engine, based on an estimate of an impeller speed of the torque converter, the estimate derived from a torque of the electric machine and a turbine speed of the torque converter responsive to the engine being disconnected from the torque converter and a loss of electric machine speed feedback.
Dependencies are inferred from the claim text.