Engine engagement control for a hybrid electric vehicle
AssigneeVisteon Global Technologies, Inc.
InventorsRongjun Zhang, Mark Leonard Hopper, Stephen De La Salle
Life of this patent
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Abstract
A control system is disclosed for minimizing the driveline vibrations in a hybrid electric vehicle during engine engagement. The control system involves determining the speed of the electric motor and taking the derivative of the speed to determine the acceleration. A signal representing the acceleration is created. The acceleration signal is filtered. The filtered acceleration signal is used to calculate a feedback control term through a controller. The controller can be either a PD controller or a PID controller with a low integral gain. The feedback control term is used to adjust the output torque of the electric motor to suppress the vibrations caused by engine engagement.
Claims23
A method for minimizing driveling vibrations during engine engagement in a hybrid electric vehicle of the type having a parallel system driveline including an electric motor and a combustion engine, the method comprising:
- determining the acceleration of the vehicle's driveline;
- creating a signal representing the driveline acceleration;
- filtering the driveline acceleration signal to filter out high frequency noise in the signal;
- determining a feedback control term from the filtered driveline acceleration signal;
- and
- utilizing a feedback control term to control an output torque of the electric motor to minimize driveline vibrations.
A method for minimizing driveline vibrations in a hybrid electric vehicle including an internal combustion engine and an electric motor, the method comprising:
- activating the electric motor;
- activating the internal combustion engine after the electric motor has been activated;
- determining the electric motor speed;
- determining the acceleration of the electric motor by taking the derivative of the electric motor speed;
- creating a signal representing the electric motor acceleration;
- filtering the electric motor acceleration signal;
- determining a filtered electric motor acceleration signal;
- determining the vibrations of the electric motor by taking the derivative of the electric motor acceleration;
- creating a signal representing the electric motor vibrations;
- and
- utilizing the vibration signal to determine an adjusted output torque of the electric motor to minimize driveline vibrations.
A method for minimizing driveline vibrations in a hybrid electric vehicle including an internal combustion engine and an electric motor, the method comprising:
- determining the speed of the driveline by determining the speed of a transmission shaft;
- creating a signal representing the driveline speed;
- filtering the driveline speed;
- determining a feedback control term from the filtered driveline speed signal;
- and
- utilizing a feedback control term to control an output torque of the electric motor to minimize driveline vibrations.
Dependencies are inferred from the claim text.