Wheel Torque Disturbance Suppression
AssigneeFord Global Technologies, LLC
InventorsHai Yu, Ihab S. Soliman, Ryan A. McGee, Mathew A. Boesch
Life of this patent
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Abstract
A method for controlling restart of an engine in a hybrid electric powertrain, includes engaging a gear of a transmission, releasing a brake pedal, maintaining fluid pressure at an adaptively determined magnitude in a wheel brake, initiating a restart the engine, and reducing fluid pressure in the wheel brake when the engine restarts.
Claims20
A method for controlling restart of an engine in a hybrid electric powertrain, comprising the steps of:
- (a) engaging a gear of a transmission that is connected by a torque converter to the engine;
- (b) releasing a brake pedal;
- (c) maintaining fluid pressure in a wheel brake;
- (d) initiating an engine restart;
- and
- (e) reducing fluid pressure in the wheel brake when the engine restarts.
A method for controlling restart of an engine in a hybrid electric powertrain, comprising the steps of:
- (a) engaging a gear of a transmission connected by a torque converter to the engine;
- (b) determining a magnitude of pressure in vehicle wheel brakes that would at least partially suppress a spike in engine crankshaft torque transmitted to the wheel while the engine is restarting;
- (c) maintaining fluid pressure in a wheel brake after releasing a brake pedal;
- (d) initiating an engine restart;
- and
- (e) reducing fluid pressure in the wheel brake when the engine restarts.
A system for controlling restart of an engine in a hybrid electric powertrain, comprising:
- a transmission engaged in a gear and connected by a torque converter to the engine;
- a brake pedal;
- a controller configured to maintain fluid pressure at an adaptively determined magnitude in a wheel brake, initiate an engine restart after the brake pedal is released, and reduce fluid pressure in the wheel brake when the engine restarts.
Dependencies are inferred from the claim text.