Gear engagement control system and method

• US 8,162,801 B2
• Filed: 02/22/2010
• Issued: 04/24/2012
• Est. Priority Date: 02/22/2010
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Liu, Sharon, Hainer, Henry A., Simon, Michael, Verner, Douglas R., Cowgill, Joshua D
• Primary Examiner(s): ESTREMSKY, SHERRY LYNN
• Application Number:
  US12/709,807
• Publication Number:
  US 20110207579A1
• Time in Patent Office: 792 Days
• Field of Search: 74/7.A, 743/39, 744/02, 744/03, 123/179.4, 477/185, 477/203
• US Class Current: 477/185
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 30/18018 Start-stop drive, e.g. in a traffic jam
• CPC Class Codes: F02N 11/0822 related to action of the driver
• CPC Class Codes: F02N 11/0844 with means for restarting the engine directly after an engine stop request, e.g. caused by change of driver mind
• CPC Class Codes: F02N 11/0855 during engine shutdown or after engine stop before start command, e.g. pre-engagement of pinion
• CPC Class Codes: F02N 2200/0802 Transmission state, e.g. gear ratio or neutral state
• CPC Class Codes: F02N 2200/102 Brake pedal position
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y10T 74/132 Separate power mesher

Abstract

A control system includes an auto-stop module, an auto-start module, and a starter module. The auto-stop module stops an engine when a brake pedal position is greater than a threshold position and a transmission is in a drive gear. The auto-start module starts the engine when the brake pedal position is less than a minimum position and the engine stop is initiated. When the engine start is initiated and an engine speed is greater than zero, the starter module engages a pinion gear of a starter with a ring gear of an engine by reciprocally actuating the pinion gear N times between a retracted position and an extended position, wherein N is an integer greater than two.

Claims

1. A control system, comprising:

an auto-stop module that stops an engine when a brake pedal position is greater than a threshold position and a transmission is in a drive gear;

an auto-start module that starts the engine when the brake pedal position is less than a minimum position and the engine stop is initiated; and

a starter module that, when the engine start is initiated and an engine speed is greater than zero, engages a pinion gear of a starter with a ring gear of an engine by reciprocally actuating the pinion gear between a retracted position and an extended position N times, wherein N is an integer greater than two.

2. The control system of claim 1, wherein N is equal to three and the starter module initiates the reciprocal actuations when the pinion gear is in the retracted position.

3. The control system of claim 1, wherein the starter module engages the pinion gear when the engine speed is less than a maximum speed.

4. The control system of claim 1, wherein the starter module reciprocally actuates the pinion gear at an actuation frequency that is higher than a rotational frequency of at least one of the pinion gear and the ring gear.

5. The control system of claim 1, wherein the starter module initiates rotation of the pinion gear when initiating actuation of the pinion gear.

6. A control system, comprising:

a gear rotation module that initiates rotation of a first gear; and

a gear actuation module that engages the first gear with a second gear rotating at a different speed by reciprocally actuating the first gear between a retracted position and an extended position N times, wherein N is an integer greater than two.

7. The control system of claim 6, wherein N is equal to three and the gear actuation module initiates the reciprocal actuations when the first gear is in the retracted position.

8. The control system of claim 6, wherein the gear actuation module continues to reciprocally actuate the first gear between the retracted position and the extended position until the first gear engages with the second gear.

9. The control system of claim 6, wherein the gear actuation module reciprocally actuates the first gear at an actuation frequency that is higher than a rotational frequency of at least one of the first gear and the second gear.

10. The control system of claim 6, wherein the gear rotation module initiates rotation of the first gear when the gear actuation module initiates actuation of the first gear.

11. A method, comprising:

initiating rotation of a first gear; and

engaging the first gear with a second gear rotating at a different speed by reciprocally actuating the first gear between a retracted position and an extended position N times, wherein N is an integer greater than two.

12. The method of claim 11, further comprising initiating the reciprocal actuations when the first gear is in the retracted position, wherein N is equal to three.

13. The method of claim 11, further comprising continuing to reciprocally actuate the first gear between the retracted position and the extended position until the first gear engages with the second gear.

14. The method of claim 11, further comprising reciprocally actuating the first gear at an actuation frequency that is different than a rotational frequency of at least one of the first gear and the second gear.

15. The method of claim 14, wherein the actuation frequency of the first gear is higher than the rotational frequency of the at least one of the first gear and the second gear.

16. The method of claim 11, further comprising initiating rotation of the first gear when initiating actuation of the first gear.

17. The method of claim 11, further comprising generating a starter activation signal to initiate rotation and actuation of the first gear.

18. The method of claim 11, wherein the second gear is a driven gear of an engine and the first gear is a driving gear of a starter.

19. The method of claim 18, further comprising:

stopping the engine when a brake pedal position is greater than a threshold position and a transmission is in a drive gear;

starting the engine when the brake pedal position is less than a minimum position and the engine stop is initiated; and

engaging the driving gear with the driven gear when the engine start is initiated and an engine speed is greater than zero.

20. The method of claim 19, further comprising engaging the driving gear with the driven gear when the engine speed is less than a maximum speed.