Method for Actuating a Vehicle Occupant Protection Device in a Vehicle and a Vehicle Occupant Protection System

• US 20080021617A1
• Filed: 04/13/2005
• Published: 01/24/2008
• Est. Priority Date: 04/16/2004
• Status: Abandoned Application

• Current Assignee: Daimler AG (Mercedes-Benz Group AG)
• Original Assignee: DaimlerChrysler AG (Mercedes-Benz Group AG)
• Inventors: Justen, Rainer, Baumann, Karl-Heinz, Fehring, Michael
• Application Number:
  US11/578,424
• Publication Number:
  US 20080021617A1
• Time in Patent Office: Days
• US Class Current: 701/46
• CPC Class Codes: B60R 2021/01311 monitoring the braking system, e.g. ABS
• CPC Class Codes: B60R 21/0134 responsive to imminent contact with an obstacle , e.g. using radar systems
• CPC Class Codes: B60T 7/22 initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle , or by means of contactless obstacle detectors mounted on the vehicle

Abstract

A vehicle occupant protection system and a method for actuating a vehicle occupant protection device in a vehicle are provided. The distance from an obstacle is sensed, a braking deceleration which is necessary to avoid a collision is determined, and the determined braking deceleration is used to determine whether a predefined event has occurred. When the predefined event occurs, the vehicle occupant protection device is actuated in order to trigger it or to activate it for the purpose of triggering, the necessary braking deceleration being determined or the determined necessary braking deceleration being evaluated for the occurrence of the predefined event, only if a driver of the vehicle has activated a brake activation element in order to initiate a braking operation.

Claims

1-11. -11. (canceled)

12. A method for actuating a vehicle occupant protection device in a vehicle, comprising:

sensing a distance from an obstacle to the vehicle;

determining a braking deceleration which is necessary to avoid a collision with the obstacle;

determining whether a predefined event has occurred, based on the determined necessary braking deceleration; and

actuating the vehicle occupant protection device when the predefined event occurs;

wherein activation of a brake control by a driver of the vehicle is a precondition for the determination of the necessary braking deceleration or for the determination of the occurrence of the predefined event.

13. The method as claimed in claim 12, wherein the predefined event has occurred if the determination of the necessary braking deceleration indicates that the collision with the obstacle can no longer be prevented.

14. The method as claimed in claim 12, wherein the predefined event has occurred if the necessary braking deceleration is above a predefined first threshold value.

15. The method as claimed in claim 12, wherein:

a braking deceleration initiated by the driver is determined and is compared with the determined necessary braking deceleration; and

the predefined event has occurred if the difference between the braking decelerations exceeds a predefined second threshold value.

16. The method as claimed in claim 15, wherein, if the difference between the braking decelerations exceeds the second threshold value:

a braking force is increased automatically for target braking; and

the vehicle is braked by the target braking in such a way that the distance from the obstacle does not drop below a predefined value.

17. The method as claimed in claim 15, wherein the necessary braking deceleration is determined at the start of braking.

18. The method as claimed in claim 12, wherein a braking force which is necessary for target braking is produced simultaneously with the actuation of the vehicle occupant protection device.

19. The method as claimed in claim 12, wherein different threshold values are predefined for actuation of the vehicle occupant protection device and for application of a braking force which is necessary for target braking.

20. The method as claimed in claim 12, wherein the vehicle occupant protection device is deactivated when an abort condition occurs.

21. The method as claimed in claim 13, wherein the predefined event has occurred if the necessary braking deceleration is above a predefined first threshold value.

22. The method as claimed in claim 13, wherein:

a braking deceleration initiated by the driver is determined and is compared with the determined necessary braking deceleration; and

the predefined event has occurred if the difference between the braking decelerations is above a predefined second threshold value.

23. The method as claimed in claim 14, wherein:

a braking deceleration initiated by the driver is determined and is compared with the determined necessary braking deceleration; and

the predefined event has occurred if the difference between the braking decelerations is above a predefined second threshold value.

24. The method as claimed in claim 16, wherein the necessary braking deceleration is determined at the start of braking.

25. The method as claimed in claim 13, wherein a braking force which is necessary for target braking is produced simultaneously with the actuation of the vehicle occupant protection device.

26. The method as claimed in claim 14, wherein a braking force which is necessary for target braking is produced simultaneously with the actuation of the vehicle occupant protection device.

27. The method as claimed in claim 15, wherein a braking force which is necessary for target braking is produced simultaneously with the actuation of the vehicle occupant protection device.

28. The method as claimed in claim 13, wherein different threshold values are predefined for actuation of the vehicle occupant protection device and for application of a braking force which is necessary for target braking.

29. The method as claimed in claim 14, wherein different threshold values are predefined for actuation of the vehicle occupant protection device and for application of a braking force which is necessary for target braking.

30. A vehicle occupant protection system in a vehicle, comprising:

a control device;

a vehicle occupant protection device which is actuated by the control device;

an environment sensor system which comprises distance sensors for sensing a distance of the vehicle from an obstacle;

a relative speed determining device for determining relative speed of the vehicle with respect to the obstacle;

a sensing device for sensing activation of a braking activation element; and

a braking deceleration determining device which determines necessary braking deceleration to avoid a collision, based on determined distance and the relative speed;

wherein the control device determines whether a predefined event has occurred, based on the determined necessary braking deceleration, and is configured to determine the necessary braking deceleration or use the determined necessary braking deceleration as a basis for actuating the vehicle occupant protection device, only if the driver has activated the brake activation element.

31. The vehicle occupant protection system as claimed in claim 30, further comprising a driving state sensing system.