System and method for preventing misfire during engine startup

Patent metadata

Field	Value
Publication number	US-9322352-B2
Application number	US-201213470874-A
Country	US
Kind code	B2
Filing date	May 14, 2012
Priority date	May 14, 2012
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

A system according to the principles of the present disclosure includes a stop-start module and a throttle control module. The stop-start module stops an engine when a driver depresses a brake pedal while an ignition system is on and the engine is idling. The throttle control module selectively opens a throttle valve when fuel injection in the engine is stopped while the ignition system is on based on engine speed and a manifold pressure within an intake manifold. The stop-start module starts the engine when the driver releases the brake pedal.

First claim

What is claimed is:

1. A system comprising:
a stop-start module that stops an engine when a driver depresses a brake pedal while an ignition system is on and the engine is idling, and that starts the engine when the driver releases the brake pedal; and
a throttle control module that, based on engine speed when fuel injection in the engine is stopped and a manifold pressure within an intake manifold, selectively opens a throttle valve when fuel injection in the engine is stopped while the ignition system is on.

2. The system of claim 1 wherein the throttle control module selectively opens the throttle valve when the engine speed is less than a predetermined speed.

3. The system of claim 2 wherein the throttle control module opens the throttle valve when the manifold pressure is less than a predetermined pressure.

4. The system of claim 3 wherein the throttle control module closes the throttle valve when the manifold pressure is greater than or equal to the predetermined pressure.

5. The system of claim 4 wherein the predetermined pressure is approximately equal to atmospheric pressure.

6. The system of claim 1 further comprising a position determination module that determines a piston position when the engine is stopping and a direction of crankshaft rotation is reversed.

7. The system of claim 6 wherein the position determination module determines the piston position based on input received from a bidirectional crankshaft sensor.

8. The system of claim 6 further comprising a spark control module that advances spark timing when the engine is starting based on the piston position when the engine is stopping.

9. The system of claim 8 wherein the spark control module advances the spark timing by an amount that is based on a difference between the piston position and top dead center.

10. The system of claim 1 further comprising a speed determination module that determines the engine speed based on input received from a crankshaft position sensor.

11. A method comprising:
stopping an engine when a driver depresses a brake pedal while an ignition system is on and the engine is idling;
selectively opening a throttle valve when fuel injection in the engine is stopped while the ignition system is on based on engine speed when fuel injection in the engine is stopped and a manifold pressure within an intake manifold; and
starting the engine when the driver releases the brake pedal.

12. The method of claim 11 further comprising selectively opening the throttle valve when the engine speed is less than a predetermined speed.

13. The method of claim 12 further comprising opening the throttle valve when the manifold pressure is less than a predetermined pressure.

14. The method of claim 13 further comprising closing the throttle valve when the manifold pressure is greater than or equal to the predetermined pressure.

15. The method of claim 14 wherein the predetermined pressure is approximately equal to atmospheric pressure.

16. The method of claim 11 further comprising determining a piston position when the engine is stopping and a direction of crankshaft rotation is reversed.

17. The method of claim 16 further comprising determining the piston position based on input received from a bidirectional crankshaft sensor.

18. The method of claim 16 further comprising advancing spark timing when the engine is starting based on the piston position when the engine is stopping.

19. The method of claim 18 further comprising advancing the spark timing by an amount that is based on a difference between the piston position and top dead center.

20. The method of claim 11 further comprising determining the engine speed based on input received from a crankshaft position sensor.

Assignees

• Santoso Halim G
• Shafto Robert Douglas
• Yurgil James R
• Gm Global Tech Operations Inc

Inventors

• Santoso Halim G
• Shafto Robert Douglas
• Yurgil James R

Classifications

• F02N2200/0801

  Vehicle speed · CPC title

• F02N2200/122

  Atmospheric temperature · CPC title

• F02N2200/102

  Brake pedal position · CPC title

• F02D41/042 Primary

  for stopping the engine · CPC title

• F02D2200/0406

  Intake manifold pressure · CPC title