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US 9,315,188 B2Granted
Methods and systems for driveline torque control
AssigneeFord Global Technologies, LLC
InventorsDennis Craig Reed, Robert Wright, Daniel Colvin, Jeffrey Allen Doering
Life of this patent
Estimating the term…
Abstract
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, driveline oscillations are reduced during engine air-fuel ratio modulation. The driveline oscillations may be reduced via adjusting torque of a motor.
Claims6
A method for operating a driveline, comprising:
- varying an engine air-fuel ratio;
- and
- adjusting torque of a motor supplying torque to the driveline and spark timing in response to varying the engine air-fuel ratio, where adjusting torque of the motor is based on an engine torque ratio, where the engine torque ratio is based on engine torque when the engine is combusting a stoichiometric air-fuel mixture, and where engine spark timing modulation increases as motor torque modulation decreases in response to decreasing battery state of charge.
A method for operating a driveline, comprising:
- varying an engine air-fuel ratio;
- and
- adjusting torque of a motor supplying torque to the driveline and spark timing in response to varying the engine air-fuel ratio, where motor torque changes based on engine air-fuel ratio changes are ceased when battery state of charge is less than a non-zero threshold battery state of charge.
Dependencies are inferred from the claim text.