Method for predicting a speed output of a hybrid powertrain system

• US 8,195,349 B2
• Filed: 09/24/2008
• Issued: 06/05/2012
• Est. Priority Date: 11/07/2007
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG, Daimler AG (Mercedes-Benz Group AG), Chrysler Group LLC (Stellantis NV)
• Original Assignee: Bayerische Motoren Werke AG, GM Global Technology Operations LLC (General Motors Company), Daimler AG (Mercedes-Benz Group AG), Chrysler LLC (Stellantis NV)
• Inventors: Heap, Anthony H., McConnell, Jason J, Kim, Kee Yong, Brunssen, Wilfried
• Primary Examiner(s): Trammell, James
• Assistant Examiner(s): Shafi, Muhammad
• Application Number:
  US12/236,578
• Publication Number:
  US 20090118880A1
• Time in Patent Office: 1,350 Days
• Field of Search: 701/22, 701/35, 701/208, 701/211, 701/213, 701/300, 180 651- 658, 340/995.1, 340/995.19, 903/930
• 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: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/445 Temperature
• CPC Class Codes: B60L 2240/486 Operating parameters
• 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 10/115 with planetary gears
• CPC Class Codes: B60W 10/18 including control of braking systems
• 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 2050/0006 Digital architecture hierarchy
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2510/0671 Engine manifold pressure
• CPC Class Codes: B60W 2510/0676 Engine temperature
• CPC Class Codes: B60W 2510/081 : Speed
• CPC Class Codes: B60W 2510/1015 : Input shaft speed, e.g. turbine speed
• CPC Class Codes: B60W 2510/104 : Output speed
• CPC Class Codes: B60W 2510/244 : Charge state
• CPC Class Codes: B60W 2510/246 : Temperature
• CPC Class Codes: B60W 2520/10 : Longitudinal speed
• CPC Class Codes: B60W 2520/28 : Wheel speed
• CPC Class Codes: B60W 2540/10 : Accelerator pedal position
• CPC Class Codes: B60W 2540/106 : Rate of change
• CPC Class Codes: B60W 2540/12 : Brake pedal position
• CPC Class Codes: B60W 2555/20 : Ambient conditions, e.g. wind or rain
• CPC Class Codes: B60W 2710/0666 : Engine torque
• CPC Class Codes: B60W 2710/083 : Torque
• 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: B60W 50/10 : Interpretation of driver requests or demands
• CPC Class Codes: F16H 2037/106 : with switching means to provide two variator modes or ranges
• CPC Class Codes: F16H 2061/6603 : characterised by changing ratio in the mechanical gearing
• CPC Class Codes: F16H 3/728 : with means to change ratio in the mechanical gearing
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility

Abstract

A method for controlling a powertrain includes determining an operator torque request, determining a time-based derivative of the operator torque request, determining a first future time, and predicting a change in the operator torque request based upon the operator torque request, the time-based derivative of the operator torque request, and the first future time.

Claims

1. A method for controlling a powertrain comprising an electro-mechanical transmission coupled to an internal combustion engine and first and second electric machines to transmit power to an output member, wherein a microprocessor performs the following steps:

determining an operator torque request;

determining a time-based derivative of the operator torque request;

determining a first future time comprising an instant in time after a predetermined elapsed time interval from a present instant in time, the predetermined elapsed time interval comprising an elapsed time for executing a control scheme associated with controlling the powertrain; and

predicting a change in the operator torque request at the first future time after the predetermined elapsed time interval based upon the operator torque request, the time-based derivative of the operator torque request, and the first future time.

2. The method of claim 1, wherein determining an operator torque request comprises:

monitoring an accelerator pedal position;

monitoring a brake pedal position; and

determining the operator torque request based upon the accelerator and brake pedal positions.

3. The method of claim 1, wherein the operator torque request is determined based upon an output of an adaptive cruise control system.

4. The method of claim 1, wherein the predicted change in the operator torque request comprises the product of the operator torque request derivative and the first future time.

5. The method of claim 4, further comprising:

predicting an operator torque request at the first future time based upon the predicted change in the operator torque request and the operator torque request.

6. The method of claim 5, wherein the predicted operator torque request at the first future time comprises the sum of the predicted change in the operator torque request and the operator torque request.

7. The method of claim 5, further comprising:

determining road loads; and

predicting a total torque request at the first future time based upon the road loads and the predicted operator torque request at the first future time.

8. The method of claim 7, wherein the predicted total torque request for the first future time is the sum of the road loads and the predicted operator torque request at the first future time.

9. The method of claim 7, further comprising:

determining a vehicle inertia at the first future time; and

predicting an angular acceleration of the output member at the first future time based upon the predicted total torque request and the vehicle inertia.

10. The method of claim 9, wherein the vehicle inertia is determined by a dynamic vehicle inertia simulator.

11. The method of claim 9, wherein the predicted angular acceleration of the output member at the first future time comprises the predicted total torque request divided by the vehicle inertia.

12. The method of claim 9, further comprising:

predicting a change in angular speed of the output member from the present time to the first future time based upon the predicted angular acceleration of the output member at the first future time, and the first future time.

13. The method of claim 12, wherein the predicted change angular speed of the output member comprises a product of the predicted angular acceleration of the output member at the first future time, and the first future time.

14. The method of claim 12, further comprising:

monitoring an angular speed of the output member; and

predicting an angular speed of the output member at the first future time based upon the predicted angular speed change of the output member from the present time to the first future time, and the angular speed of the output member.

15. The method of claim 14, wherein the predicted angular speed of the output member at the first future time comprises a sum of the angular speed of the output member and the predicted change in angular speed of the output member.

16. The method of claim 14, wherein the predicted change in the operator torque request, the predicted operator torque request, the predicted total torque request, the predicted angular acceleration of the output member, the predicted angular speed change of the output member, and the predicted angular speed of the output member are determined for each of a plurality of future times.

17. A method for controlling a powertrain including an internal combustion engine mechanically connected to a transmission device to transmit tractive power to a driveline, wherein a microprocessor performs the following steps

monitoring an accelerator pedal position;

monitoring a brake pedal position;

determining an operator torque request based upon the accelerator and brake pedal positions;

determining a first future time comprising an instant in time after a predetermined elapsed time interval from a present instant in time, the predetermined elapsed time interval comprising an elapsed time for executing a control scheme associated with controlling the powertrain;

determining road loads;

determining a vehicle inertia at the first future time; and

predicting an angular acceleration of the output member at the first future time after the predetermined elapsed time interval based upon the operator torque request, the first future time, the road loads, and the vehicle inertia.

18. The method of claim 17, wherein predicting the angular acceleration of the output member (NopotPrdct) takes the form of

19. The method of claim 17, further comprising:

monitoring an angular speed of the output member; and

predicting an angular speed of the output member at the first future time based upon the predicted angular acceleration of the output member at the first future time, the first future time, and the monitored angular speed of the output member.

20. The method of claim 19, wherein the predicted angular speed of the output member (NoPrdct) at the first future time takes the form

NoPrdct=NoDotPrdct×

B+F

wherein F is the angular speed of the output member.

21. A method for controlling an internal combustion engine mechanically-operatively connected to an electro-mechanical transmission, wherein a microprocessor performs the following steps

monitoring an accelerator pedal position;

monitoring a brake pedal position;

determining an operator torque request based upon the accelerator and brake pedal positions;

determining a first future time comprising an instant in time after a predetermined elapsed time interval from a present instant in time, the predetermined elapsed time interval comprising an elapsed time for executing a control scheme associated with controlling the powertrain;

determining road loads;

determining a vehicle inertia at the first future time; and

predicting an angular acceleration of an output member at the first future time after the predetermined elapsed time interval based upon the operator torque request, the first future time, the road loads, and the vehicle inertia.