METHOD FOR PREDICTING AN OPERATOR TORQUE REQUEST OF A HYBRID POWERTRAIN SYSTEM

• US 20090118879A1
• Filed: 09/24/2008
• Published: 05/07/2009
• Est. Priority Date: 11/05/2007
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG, Daimler AG (Mercedes-Benz Group AG), Chrysler Group LLC (Stellantis NV)
• Original Assignee: BMW AG (Bayerische Motoren Werke AG), Daimler AG (Mercedes-Benz Group AG), GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust), Chrysler LLC (Stellantis NV)
• Inventors: Heap, Anthony H., Kim, Kee Yong
• Granted Patent: US 8,160,761 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/105 of electric type
• CPC Class Codes: B60W 10/24 including control of energy storage means
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 2050/0004 In digital systems, e.g. discrete-time systems involving sampling
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2720/10 Longitudinal speed
• CPC Class Codes: B60W 2720/103 Speed profile
• CPC Class Codes: B60W 30/18 Propelling the vehicle
• CPC Class Codes: B60W 30/18009 related to particular drive situations
• CPC Class Codes: B60W 30/188 Controlling power parameters of the driveline, e.g. determining the required power
• CPC Class Codes: B60W 50/0097 Predicting future conditions
• CPC Class Codes: B60W 50/04 Monitoring the functioning of the control system
• CPC Class Codes: F16H 2037/106 with switching means to provide two variator modes or ranges
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A method for controlling a hybrid powertrain system based upon a predicted speed of an output member, a predicted operator torque request, and a predicted accelerator pedal position is disclosed. The method comprises predicting the accelerator pedal position based upon a monitored accelerator pedal position and a filtered accelerator pedal position, predicting the speed of an output member based upon a monitored speed of the output member, and predicting the operator torque request based upon the predicted speed of the output member and the predicted accelerator position.

Claims

1. Method for controlling a powertrain system including an engine and an electric machine mechanically coupled to an electromechanical transmission to transfer power to an output member, the method comprising:

monitoring an accelerator pedal position;

monitoring speed of the output member;

determining an acceleration of the output member;

predicting the accelerator pedal position for a future time instant based upon a filtered accelerator pedal position and a time-based derivative of the accelerator pedal position;

predicting the speed of an output member for the future time instant based upon the speed and the acceleration of the output member; and

predicting an operator torque request for the future time instant based upon the predicted speed of the output member and the predicted accelerator position for the future time instant.

2. The method of claim 1, further comprising:

filtering the monitored accelerator pedal position;

determining a time-based derivative of the accelerator pedal position based upon the filtered accelerator pedal position and an elapsed time period.

3. The method of claim 2, wherein the time-based derivative of the accelerator pedal position is determined based upon an error between the monitored accelerator pedal position and the filtered accelerator pedal position.

4. The method of claim 3, wherein the error comprises a difference between the monitored accelerator pedal position and the filtered accelerator pedal position over the elapsed time period.

5. The method of claim 2, wherein the time-based derivative of the accelerator pedal position is a change in the accelerator pedal position over the elapsed time period.

6. The method of claim 1, wherein predicting the accelerator pedal position for the future time instant comprises:

calculating a time-based derivative of the accelerator pedal position;

multiplying the time-based derivative of the accelerator pedal position and a predetermined elapsed time interval; and

combining the filtered accelerator pedal position with the product of the time-based derivative of the accelerator pedal position and the predetermined elapsed time interval.

7. The method of claim 6, further comprising:

adding a correction factor to the filtered accelerator pedal position.

8. The method of claim 1, further comprising combining the monitored speed of the output member with the product of the monitored acceleration of the output member and a predetermined elapsed time interval to predict the speed of the output member.

9. The method of claim 1, comprising determining the predicted operator torque request for the future time instant based upon the predicted accelerator pedal position and the predicted speed of the output member and a predetermined relationship.

10. A method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and first and second electric machines to transmit mechanical power to an output member, the method comprising:

monitoring an accelerator pedal position;

monitoring speed of the output member;

determining acceleration of the output member;

filtering the accelerator pedal position;

determining a time-based derivative of the accelerator pedal position based upon the filtered accelerator pedal position and an elapsed time period;

predicting the accelerator pedal position for a future time instant based upon the filtered accelerator pedal position and the time-based derivative of the accelerator pedal position;

predicting the speed of an output member for the future time instant based upon the speed and acceleration of the output member; and

predicting an operator torque request for the future time instant based upon the predicted speed of the output member and the predicted accelerator position for the future time instant.

11. The method of claim 10, wherein the time-based derivative of the accelerator pedal position is determined based upon an error between the monitored accelerator pedal position and the filtered accelerator pedal position.

12. The method of claim 11, wherein the error is a difference between the monitored accelerator pedal position and the filtered accelerator pedal position.

13. The method of claim 12, wherein the time-based derivative of the accelerator pedal position comprises a change in the monitored accelerator pedal position over an elapsed time period.

14. The method of claim 13, wherein predicting the accelerator pedal position for the future time instant comprises:

calculating a time-based derivative of the accelerator pedal position;

multiplying the time-based derivative of the accelerator pedal position with a predetermined elapsed time interval; and

adding the filtered accelerator pedal position with the product of the time-based derivative of the accelerator pedal position and the predetermined elapsed time interval.

15. The method of claim 14, further comprising:

adding the filtered accelerator pedal position and a correction factor with the product of the time-based derivative of the accelerator pedal position and the predetermined elapsed time interval.

16. The method of claim 10, wherein predicting the speed of an output member for the future time instant comprises:

adding the monitored speed of the output member with the product of the monitored acceleration of the output member over an elapsed time interval.

17. A method for controlling an internal combustion engine mechanically-operatively connected to an electromechanical transmission, the method comprising:

monitoring an accelerator pedal position;

monitoring speed of the output member;

determining acceleration of the output member;

filtering the monitored accelerator pedal position;

determining a time-based derivative of the accelerator pedal position based upon the filtered accelerator pedal position and an elapsed time period;

predicting the accelerator pedal position for a future time instant based upon the filtered accelerator pedal position and the time-based derivative of the accelerator pedal position;

predicting the speed of an output member for the future time instant based upon the monitored speed and acceleration of the output member; and

predicting an operator torque request for the future time instant based upon the predicted speed of the output member and the predicted accelerator position for the future time instant.

18. The method of claim 17, wherein the time-based derivative of the accelerator pedal position is determined based upon an error between the monitored accelerator pedal position and the filtered accelerator pedal position, wherein the error is a difference between the monitored accelerator pedal position and the filtered accelerator pedal position.

19. The method of claim 17, wherein the time-based derivative of the accelerator pedal position is a change in the monitored accelerator pedal position over an elapsed time period divided by the elapsed time period, and wherein predicting the accelerator pedal position for the future time instant comprises:

calculating a time-based derivative of the accelerator pedal position;

multiplying the time-based derivative of the accelerator pedal position with a predetermined elapsed time interval; and

combining the filtered accelerator pedal position with the product of the time-based derivative of the accelerator pedal position and the predetermined elapsed time interval.

20. The method of claim 17, wherein predicting the speed of an output member for the future time instant comprises:

adding the monitored speed of the output member with the product of the monitored acceleration of the output member and a predetermined elapsed time interval.