METHOD AND CONTROL SYSTEM FOR CONTROLLING AN ENGINE FUNCTION BASED ON CRAKSHAFT ACCELERATION

• US 20100088010A1
• Filed: 06/04/2009
• Published: 04/08/2010
• Est. Priority Date: 10/08/2008
• 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: Kalweit, Nicholas John, Verdejo, Julian R., Mathews, David S., Grimes, Michael R.
• Granted Patent: US 7,918,212 B2
• Time in Patent Office: Days
• US Class Current: 701/105
• CPC Class Codes: B60K 2006/4833 Step up or reduction gearing driving generator, e.g. to operate generator in most efficient speed range
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60L 2240/486 Operating parameters
• 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 10/10 including control of change-speed gearings
• 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 20/15 Control strategies specially adapted for achieving a particular effect
• CPC Class Codes: B60W 2510/0283 Clutch input shaft speed
• CPC Class Codes: B60W 2510/06 Combustion engines, Gas turbines
• CPC Class Codes: B60W 2510/0685 Engine crank angle
• CPC Class Codes: B60W 2710/02 Clutches
• CPC Class Codes: B60W 2710/105 Output torque
• CPC Class Codes: F02D 2041/1417 Kalman filter
• CPC Class Codes: F02D 41/009 using means for generating position or synchronisation signals
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A method and control system for controlling an engine includes an instantaneous crankshaft acceleration determining module determining an instantaneous crankshaft acceleration. An engine parameter adjustment module adjusts an engine parameter in response to the instantaneous crankshaft acceleration.

Claims

1. A method of operating an engine comprising:

determining an instantaneous crankshaft acceleration; and

adjusting an engine parameter in response to the instantaneous crankshaft acceleration.

2. A method as recited in claim 1 wherein determining an instantaneous crankshaft acceleration comprises determining the instantaneous crankshaft acceleration from a crankshaft position sensor.

3. A method as recited in claim 2 wherein the crankshaft position sensor comprises a toothed wheel and wherein determining an instantaneous crankshaft acceleration comprises determining the instantaneous crankshaft acceleration over an angular range of a crankshaft corresponding to one tooth in the toothed wheel.

4. A method as recited in claim 2 wherein the crankshaft position sensor comprises a toothed wheel and wherein determining an instantaneous crankshaft acceleration comprises determining the instantaneous crankshaft acceleration over an angular range of a crankshaft corresponding to less than about ten degrees.

5. A method as recited in claim 1 further comprising determining a peak crankshaft acceleration location and wherein adjusting an engine parameter comprises adjusting an engine spark timing based on the peak crankshaft acceleration location.

6. A method as recited in claim 1 further comprising determining a peak crankshaft acceleration location and wherein adjusting an engine parameter comprises adjusting a fuel injection timing based on the peak crankshaft acceleration location.

7. A method as recited in claim 1 further comprising determining a peak crankshaft acceleration location and wherein adjusting an engine parameter comprises adjusting combustion phasing.

8. A method as recited in claim 1 further comprising determining a peak crankshaft acceleration location and wherein adjusting an engine parameter comprises adjusting combustion phasing so that a peak is between about 20 to about 30 degrees after top dead center.

9. A method as recited in claim 1 further comprising determining a peak crankshaft acceleration location and wherein adjusting an engine parameter comprises adjusting combustion phasing so that a peak is between about 24 degrees after top dead center.

10. A method as recited in claim 1 wherein determining an instantaneous crankshaft acceleration comprises determining the instantaneous crankshaft acceleration for each cylinder of the engine, and wherein adjusting an engine parameter in response to crankshaft acceleration comprises adjusting an engine parameter in response to crankshaft acceleration for each cylinder of the engine.

11. A method as recited in claim 1 wherein adjusting an engine parameter in response to crankshaft acceleration comprises adjusting dilution.

12. A method as recited in claim 11 further comprising determining a coefficient of variation of the instantaneous crankshaft acceleration from a plurality of engine cycles, and wherein adjusting comprises adjusting dilution for each of the engine cycles.

13. A method as recited in claim 12 wherein adjusting comprises adjusting dilution in response to comparing the instantaneous crankshaft acceleration to a coefficient of variation.

14. A control module comprising:

an instantaneous crankshaft acceleration determining module determining an instantaneous crankshaft acceleration; and

an engine parameter adjustment module adjusting an engine parameter in response to the instantaneous crankshaft acceleration.

15. A control module as recited in claim 14 further comprising a peak crankshaft acceleration location determination module determining a peak crankshaft acceleration location and wherein the engine parameter adjustment module adjusts engine spark timing based on the peak crankshaft acceleration location.

16. A control module as recited in claim 14 further comprising a peak crankshaft acceleration location determination module determining a peak crankshaft acceleration location and wherein the engine parameter adjustment module adjusts fuel injection timing based on the peak crankshaft acceleration location.

17. A control module as recited in claim 14 further comprising a peak crankshaft acceleration location determination module determining a peak crankshaft acceleration location and wherein the engine parameter adjustment module adjusts combustion phasing.

18. A control module as recited in claim 14 further comprising a peak crankshaft acceleration location determination module determining a peak crankshaft acceleration location and wherein the engine parameter adjustment module adjusts combustion phasing to between about 20 to about 30 degrees after top dead center.

19. A control module as recited in claim 14 further comprising a peak crankshaft acceleration location determination module determining a peak crankshaft acceleration location and wherein the engine parameter adjustment module adjusts dilution based on the peak crankshaft acceleration location.

20. A control module as recited in claim 19 wherein the engine parameter adjustment module adjusts dilution in response to a coefficient of variation.