METHOD FOR CONTROLLING A STOP AND AUTOMATIC RESTART DEVICE FOR A THERMAL ENGINE

• US 20100057323A1
• Filed: 10/30/2007
• Published: 03/04/2010
• Est. Priority Date: 11/15/2006
• Status: Active Grant

• Current Assignee: Peugeot Citroen Automobile SA (Stellantis NV)
• Original Assignee: Peugeot Citroen Automobile SA (Stellantis NV)
• Inventors: Jourdes, Philippe
• Granted Patent: US 8,047,173 B2
• Time in Patent Office: Days
• US Class Current: 701/101
• CPC Class Codes: F02N 11/04 the motors being associated with current generators
• CPC Class Codes: F02N 11/0825 related to prevention of engine restart failure, e.g. disabling automatic stop at low battery state
• CPC Class Codes: F02N 11/10 Safety devices F02N11/08 takes precedence
• CPC Class Codes: F02N 2200/045 Starter temperature or parameters related to it
• CPC Class Codes: F02N 2200/061 Battery state of charge [SOC]
• CPC Class Codes: F02N 2200/064 Battery temperature
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

The invention relates to a method for controlling a stop and automatic restart device for a thermal engine of a vehicle, comprising electric energy storage means and a reversible alternator connected to the thermal engine. The method comprises: comparing (16, 18) the temperature of the alternator (10) with a first predetermined temperature detecting (16, 18) the occurrence of at least one of the two following conditions concerning the electric energy storage means: a temperature (12) lower than a second predetermined temperature and a charge level (14) lower than a predetermined threshold; and if the alternator temperature is higher than the first predetermined temperature and if at least one of said two conditions occurs, inhibiting (26) the automatic restart of the engine.

Claims

1. Control method for an automatic stop-and-start device for a heat engine of a vehicle comprising electrical energy storage means and a reversible alternator connected to the heat engine comprising:

comparing the alternator temperature to a first predetermined temperature,

detecting the appearance of at least one of the following two conditions relative to the electrical energy storage means;

a temperature less than a second predetermined temperature and a charge level less than a predetermined threshold, and

disabling the automatic engine restart if the alternator temperature is greater than the first predetermined temperature, and if at least one of said two conditions appears.

2. Method according to claim 1, wherein the temperature of the alternator is that of its stator.

3. Method according to claim 1, wherein the first predetermined temperature is between 110°

C. and 150°

C., and the predetermined threshold for the charge level is less than 90% of the maximum charge level.

4. Method according to claim 3, wherein the first predetermined temperature is around 130°

C. and the predetermined threshold for the charge level is around 80% of the maximum charge level.

5. Method according to claim 1, wherein the second predetermined temperature is between −

15°

C. and +5°

C.

6. Method according to claim 5, wherein the second predetermined temperature is around −

10°

C.

7. Method according to claim 1 wherein said two conditions are taken into account for disabling or not disabling the automatic engine restart.

8. Method according to claim 1, wherein, in addition to disabling the engine restart, the automatic engine shutoff is disabled if the alternator temperature is greater than the first predetermined temperature and if at least one of the said two conditions relating to the storage means appears.

9. Method according to claim 2, wherein the first predetermined temperature is between 110°

C. and 150°

C., and the predetermined threshold for the charge level is less than 90% of the maximum charge level.

10. Method according to claim 9, wherein the first predetermined temperature is around 130°

C. and the predetermined threshold for the charge level is around 80% of the maximum charge level.

11. Method according to claim 2, wherein the second predetermined temperature is between −

15°

C. and +5°

C.

12. Method according to claim 11, wherein the second predetermined temperature is around −

10°

C.

13. Method according to claim 3, wherein the second predetermined temperature is between −

15°

C. and +5°

C.

14. Method according to claim 13, wherein the second predetermined temperature is around −

10°

C.

15. Method according to claim 4, wherein the second predetermined temperature is between −

15°

C. and +5°

C.

16. Method according to claim 15, wherein the second predetermined temperature is around −

10°

C.

17. Method according to claim 9, wherein the second predetermined temperature is between −

15°

C. and +5°

C.

18. Method according to claim 17, wherein the second predetermined temperature is around −

10°

C.

19. Method according to claim 10, wherein the second predetermined temperature is between −

15°

C. and +5°

C.

20. Method according to claim 19, wherein the second predetermined temperature is around −

10°

C.