Engine torque control with desired state estimation

• US 7,614,384 B2
• Filed: 04/29/2008
• Issued: 11/10/2009
• Est. Priority Date: 11/02/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Johansson, Magnus, Livshiz, Michael, Kaiser, Jeffrey M., Whitney, Christopher E., Andersson, Per, Babcock, Douglas J.
• Primary Examiner(s): Moulis; Thomas N
• Application Number:
  US12/111,397
• Publication Number:
  US 20090118968A1
• Time in Patent Office: 560 Days
• Field of Search: 123/399, 123/400, 123/480, 123/486, 123/494, 123/406.45, 701/102, 701/103, 701/104, 701/106
• US Class Current: 123/399
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 13/0219 by shifting the phase, i.e. the opening periods of the valves are constant
• CPC Class Codes: F02D 13/06 Cutting-out cylinders
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• CPC Class Codes: F02D 2200/0402 the parameter being determined by using a model of the engine intake or its components
• CPC Class Codes: F02D 2200/0406 Intake manifold pressure
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 37/02 one of the functions being ignition
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine
• CPC Class Codes: F02M 26/13 Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories

Abstract

An engine control system comprises a predicted airflow module, a first actuator determination module, a first desired air module, and an actuator position module. The predicted airflow module determines a predicted engine airflow based on a desired torque. The first actuator determination module determines a first engine actuator value based on the predicted engine airflow. The first desired air module selectively determines a first desired engine air value based on the first engine actuator value and the desired torque. The actuator position module determines a desired engine actuator value based on the first desired engine air value.

Claims

1. An engine control system comprising:

a predicted airflow module that determines a predicted engine airflow based on a desired torque;

a first actuator determination module that determines a first engine actuator value based on said predicted engine airflow;

a first desired air module that selectively determines a first desired engine air value based on said first engine actuator value and said desired torque; and

an actuator position module that determines a desired engine actuator value based on said first desired engine air value.

2. The engine control system of claim 1 wherein said first engine actuator value comprises a spark advance value.

3. The engine control system of claim 1 wherein said predicted engine airflow comprises one of predicted air per cylinder (APC) and predicted mass airflow (MAF).

4. The engine control system of claim 1 wherein said first engine actuator value comprises at least one of a spark advance value, an intake cam phaser angle, an exhaust cam phaser angle, and an air/fuel ratio.

5. The engine control system of claim 1 wherein said first desired engine air value comprises a desired manifold absolute pressure (MAP).

6. The engine control system of claim 5 further comprising a boost control module that controls one of a turbocharger and a supercharger based on said desired engine actuator value, wherein said desired engine actuator value comprises a desired boost pressure.

7. The engine control system of claim 1 wherein said first desired engine air value comprises one of desired air per cylinder (APC) and desired mass airflow (MAF).

8. The engine control system of claim 7 wherein said desired engine actuator value comprises a desired throttle area.

9. The engine control system of claim 7 wherein said desired engine actuator value comprises a desired cam phaser angle.

10. The engine control system of claim 1 further comprising a second desired air module that selectively determines a desired engine airflow based on said first engine actuator value and said desired torque, wherein said first desired engine air value comprises a desired manifold pressure, and wherein said actuator position module determines said desired engine actuator value based on said desired engine airflow and said desired manifold pressure.

11. The engine control system of claim 10 wherein said desired engine actuator value comprises a desired throttle area.

12. The engine control system of claim 1 further comprising a second actuator determination module that determines a second engine actuator value based on a current engine airflow, wherein said first desired air module determines said first desired engine air value based on said first engine actuator value when in a first mode and based on said second engine actuator value when in a second mode.

13. The engine control system of claim 12 further comprising a mode module that selects said first mode when a change in said desired torque is greater than said predetermined threshold and said desired torque is greater than a second predetermined threshold.

14. A method of controlling an engine, comprising:

determining a predicted engine airflow based on a desired torque;

determining a first engine actuator value based on said predicted engine airflow;

selectively determining a first desired engine air value based on said first engine actuator value and said desired torque; and

determining a desired engine actuator value based on said first desired engine air value.

15. The method of claim 14 wherein said first engine actuator value comprises a spark advance value.

16. The method of claim 14 wherein said predicted engine airflow comprises one of predicted air per cylinder (APC) and predicted mass airflow (MAF).

17. The method of claim 14 wherein said first engine actuator value comprises at least one of a spark advance value, an intake cam phaser angle, an exhaust cam phaser angle, and an air/fuel ratio.

18. The method of claim 14 wherein said first desired engine air value comprises a desired manifold absolute pressure (MAP).

19. The method of claim 18 further comprising controlling one of a turbocharger and a supercharger based on said desired engine actuator value, wherein said desired engine actuator value comprises a desired boost pressure.

20. The method of claim 14 wherein said first desired engine air value comprises one of desired air per cylinder (APC) and desired mass airflow (MAF).

21. The method of claim 20 wherein said desired engine actuator value comprises a desired throttle area.

22. The method of claim 20 wherein said desired engine actuator value comprises a desired cam phaser angle.

23. The method of claim 14 further comprising selectively determining a desired engine airflow based on said first engine actuator value and said desired torque, wherein said first desired engine air value comprises a desired manifold pressure, wherein said desired engine actuator value is based on said desired engine airflow and said desired manifold pressure, and wherein said desired engine actuator value comprises a desired throttle area.

24. The method of claim 14 further comprising determining a second engine actuator value based on a current engine airflow, wherein said first desired engine air value is based on said first engine actuator value when in a first mode and based on said second engine actuator value when in a second mode.

25. The method of claim 24 further comprising selecting said first mode when a change in said desired torque is greater than said predetermined threshold and said desired torque is greater than a second predetermined threshold.