Engine engagement control for a hybrid electric vehicle
First Claim
1. 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.
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Accused Products
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.
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Citations
23 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for minimizing driveline vibrations in a hybrid electric vehicle including an internal combustion engine and an electric motor, the method comprising:
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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. - View Dependent Claims (13)
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14. A method for minimizing driveline vibrations in a hybrid electric vehicle including an internal combustion engine and an electric motor, the method comprising:
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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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification