System and method for sensing soil-and curb-tripped rollover events

• US 20060253239A1
• Filed: 04/21/2006
• Published: 11/09/2006
• Est. Priority Date: 04/25/2005
• Status: Active Grant

• Current Assignee: Robert Bosch Corporation (Robert Bosch GmbH), Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Williams, Kyle
• Granted Patent: US 7,734,394 B2
• Time in Patent Office: Days
• US Class Current: 701/45
• CPC Class Codes: B60R 2021/0006 Lateral collision
• CPC Class Codes: B60R 2021/0018 Roll-over
• CPC Class Codes: B60R 2021/0119 Plausibility check
• CPC Class Codes: B60R 2021/01327 Angular velocity or angular acceleration
• CPC Class Codes: B60R 21/0132 responsive to vehicle motion parameters , e.g. to vehicle longitudinal or transversal deceleration or speed value
• CPC Class Codes: B60R 21/01332 by frequency or waveform analysis
• CPC Class Codes: B60R 21/01336 using filtering

Abstract

A method and a system of controlling a restraint device in a vehicle during a crash. The method includes sensing a lateral condition, classifying the crash, sensing a roll value, comparing the roll value with a plausibility region, and activating the restraint device based on the classified crash and when the roll value falls within the plausibility region.

Claims

1. A method of controlling a restraint device in a vehicle during a crash, the method comprising:

sensing a lateral condition;

classifying the crash based on the lateral condition;

sensing a roll value;

comparing the roll value with a plausibility region; and

activating the restraint device based on the classified crash and when the roll value falls within the plausibility region.

2. The method of claim 1, wherein the lateral condition comprises a lateral acceleration.

3. The method of claim 2, wherein the lateral acceleration further comprises one of a low-force acceleration and a high-force acceleration.

4. The method of claim 1, wherein classifying the crash based on the lateral condition comprises determining a processed lateral condition from the lateral condition, wherein the processed condition comprises at least one of a derivative of the lateral condition, a slope of the lateral condition, and a rate of change of the lateral condition.

5. The method of claim 4, wherein classifying the crash based on the lateral condition comprises:

retrieving a set of lateral conditions and a set of processed lateral conditions;

defining a plurality of lateral condition regions based on the set of lateral conditions and the set of processed lateral conditions;

comparing the sensed lateral condition and the processed lateral condition with the lateral condition regions; and

indicating a trip-rollover type if the sensed lateral condition and the processed lateral condition fall in one of the lateral condition regions, wherein the trip-rollover type comprises a soil-trip rollover and a curb-trip rollover.

6. The method of claim 4, wherein activating the restraint device comprises:

comparing the lateral condition and the processed lateral condition to a soil-trip threshold;

comparing the lateral condition and the processed lateral condition to a curb-trip threshold; and

activating the restraint device based on a soil-trip rollover crash when the lateral condition and the processed lateral condition cross the soil-trip threshold, and a curb-trip rollover crash when the lateral condition and the processed lateral condition cross the curb-trip threshold.

7. The method of claim 1, wherein the roll value comprises one of a roll rate, a roll acceleration, and a roll angle, the method further comprising processing the roll value to obtain one of a derivative of the roll value and an integral of the roll value.

8. The method of claim 7, wherein comparing the roll value further comprises:

defining the plausibility region with a set of angular roll rates and a set of angular accelerations; and

determining if the roll value and the processed roll value fall in the plausibility region.

9. The method of claim 1, wherein classifying the crash further comprises introducing a hold time after which the crash is classified.

10. A method of controlling a restraint device in a vehicle during a crash, the method comprising:

generating a first signal indicative of a lateral acceleration of the vehicle;

determining a second signal from the first signal;

retrieving a trip-rollover region representing lateral accelerations and changes in lateral accelerations based on the first and second signals;

generating a third signal indicative of a roll rate of the vehicle;

determining a fourth signal from the third signal;

retrieving a plausibility region representing roll rates and changes in roll rates based on the third and fourth signals; and

activating the restraint device when the first and second signals are in the trip-rollover region, and when the third and fourth signals are in the plausibility region.

11. The method of claim 10, wherein the first signal further comprises at least one of a low-force acceleration and a high-force acceleration.

12. The method of claim 10, wherein the second signal comprises at least one of a derivative of the lateral acceleration, a slope of the lateral acceleration, and a rate of change of the lateral acceleration.

13. The method of claim 10, wherein activating the restraint device comprises:

comparing the first and second signals to a soil-trip threshold;

comparing the first and second signals to a curb-trip threshold; and

activating the restraint device based on a soil-trip rollover crash when the first and second signals cross the soil-trip threshold, and a curb-trip rollover crash when the first and second signals cross the curb-trip threshold.

14. The method of claim 13, further comprising introducing a hold time after which the crash is classified.

15. A system for controlling a restraint device in a vehicle during a crash, the system comprising:

a lateral condition sensor configured to sense a lateral condition experienced by the vehicle;

a classifier configured to classify the crash based on the lateral condition;

a roll sensor configured to sense a roll condition experienced by the vehicle;

a comparator configured to compare the sensed roll value with a plausibility region; and

a signal generator configured to activate the restraint device based on the classified crash and when the roll value falls within the plausibility region.

16. The system of claim 15, wherein the lateral condition comprises a lateral acceleration.

17. The system of claim 16, wherein the lateral acceleration further comprises one of a low-force acceleration and a high-force acceleration.

18. The system of claim 15, further comprising a processor configured to determine a processed lateral condition from the lateral condition, wherein the processed condition comprises at least one of a derivative of the lateral condition, a slope of the lateral condition, and a rate of change of the lateral condition.

19. The system of claim 18, further comprising a memory operable to store a plurality of lateral condition regions derived from calibrating a set of lateral conditions and a set of processed lateral conditions,

wherein the comparator is further configured to compare the sensed lateral condition and the processed lateral condition with the lateral condition regions, and

wherein the processor is further configured to indicate a trip-rollover type if the sensed lateral condition and the processed lateral condition fall in one of the lateral condition regions, wherein the trip-rollover type comprises a soil-trip rollover and a curb-trip rollover.

20. The system of claim 19, wherein the comparator is further configured to compare the lateral condition and the processed lateral condition to a soil-trip threshold, and to compare the lateral condition and the processed lateral condition to a curb-trip threshold, and

wherein the signal generator activates the restraint device based on a soil-trip rollover crash when the lateral condition and the processed lateral condition cross the soil-trip threshold, and a curb-trip rollover crash when the lateral condition and the processed lateral condition cross the curb-trip threshold.

21. The system of claim 19, wherein the roll condition comprises one of a roll rate, a roll acceleration, and a roll angle, wherein the processor is further configured to process the roll value to obtain one of a derivative of the roll value and an integral of the roll value.

22. The system of claim 18, wherein the processor is further configured to introduce a hold time after which the crash is classified.

23. The system of claim 15, further comprising a second comparator configured to retrieve the plausibility region derived from a set of angular roll rates and a set of angular accelerations, and to determine if the roll value and the processed roll value fall in the plausibility region.