Engine engagement control for a hybrid electric vehicle

• US 20030229429A1
• Filed: 06/05/2002
• Published: 12/11/2003
• Est. Priority Date: 06/05/2002
• Status: Active Grant

• Current Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Original Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Inventors: Salle, Stephen De La, Zhang, Rongjun, Hopper, Mark Leonard
• Granted Patent: US 6,842,673 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 2050/001 Proportional integral [PI] controller
• CPC Class Codes: B60W 2050/0011 Proportional Integral Differential [PID] controller
• CPC Class Codes: B60W 2050/0013 Optimal controllers
• CPC Class Codes: B60W 2050/0014 Adaptive controllers
• CPC Class Codes: B60W 2050/0052 Filtering, filters
• CPC Class Codes: B60W 2050/0055 High-pass filters
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2510/082 Speed change rate
• CPC Class Codes: B60W 2510/1015 Input shaft speed, e.g. turbine speed
• CPC Class Codes: B60W 2510/102 Input speed change rate
• CPC Class Codes: B60W 2510/104 Output speed
• CPC Class Codes: B60W 2510/1045 Output speed change rate
• CPC Class Codes: B60W 30/20 Reducing vibrations in the driveline
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility

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.

Claims

1. A method for minimizing driveline 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.

2. The method of claim 1 wherein the vehicle'"'"'s driveline acceleration is determined by determining the acceleration of the vehicle'"'"'s electric motor.

3. The method of claim 1 further comprising:

determining the electric motor speed;

creating a signal representing the electric motor speed; and

wherein the acceleration of the driveline is determine from the electric motor speed signal.

4. The method of claim 1 wherein the vehicle'"'"'s driveline acceleration is determined by a sensor.

5. The method of claim 1 wherein the filtered driveline acceleration signal is low-pass filtered.

6. The method of claim 1 wherein the feedback control term is determined using a PD controller.

7. The method of claim 1 wherein the feedback control term is determined using a PID controller with low integral gain.

8. The method of claim 1 wherein the feedback control term is determined using a nonlinear controller.

9. The method of claim 1 wherein the feedback control term is determined using a robust controller.

10. The method of claim 1 wherein the feedback control term is determined using an adaptive controller.

11. The method of claim 1 wherein the hybrid electric vehicle is a parallel configuration.

12. 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.

13. The method of claim 12 further comprising creating a signal representing the electric motor speed.

14. 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;

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.

15. The method of claim 14 wherein the driveline speed signal is determined by determining the speed of the electric motor.

16. The method of claim 14 wherein the driveline speed signal is determined by determining the speed of the transmission input shaft.

17. The method of claim 14 wherein the driveline speed signal is determined by determining the speed of the transmission output shaft.

18. The method of claim 14 wherein the driveline speed is determined by a sensor.

19. The method of claim 14 wherein the driveline speed signal is high-pass filtered.

20. The method of claim 14 wherein the feedback control term is determined using a PD controller.

21. The method of claim 14 wherein the feedback control term is determined using a PID controller.

22. The method of claim 14 wherein the feedback control term is determined using a nonlinear controller.

23. The method of claim 14 wherein the feedback control term Is determined using a robust controller.

24. The method of claim 14 wherein the feedback control term is determined using an adaptive controller.