Method of activating safety devices utility

• US 20050000748A1
• Filed: 05/12/2004
• Published: 01/06/2005
• Est. Priority Date: 11/13/2001
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Link, Andrea, Urbahn, Jan, Watzka, Willibald
• Granted Patent: US 7,011,175 B2
• Time in Patent Office: Days
• US Class Current: 180/282
• CPC Class Codes: B60R 2021/0006 Lateral collision
• CPC Class Codes: B60R 2021/01322 comprising variable thresholds, e.g. depending from other collision parameters
• CPC Class Codes: B60R 21/0132 responsive to vehicle motion parameters , e.g. to vehicle longitudinal or transversal deceleration or speed value

Abstract

A method for activating safety devices comprising a first longitudinal impact sensor, a second lateral impact sensor and a processing device which activates the safety devices, wherein when the motion signals and/or signals derived therefrom exceed defined threshold values, the threshold values that are critical for the activation of the safety devices are increased in the event of an immediately preceding abnormal motion of the vehicle in the longitudinal direction.

Claims

1. A method for activating safety devices of a vehicle, comprising the steps of:

generating with a first impact sensor a longitudinal motion signal representing a motion in a longitudinal direction of the vehicle;

generating with a second impact sensor a lateral motion signal representing a motion in the lateral direction of the vehicle; and

activating the safety devices when a processing device determines that the motion signals or signals derived therefrom exceed defined threshold values,

wherein the threshold value for activation of the safety devices provided to protect vehicle occupants from abnormal motion in the lateral direction are increased in the event of an immediately preceding abnormal motion of the vehicle in the longitudinal direction.

2. The method as claimed in claim 1, wherein, after the lateral safety device threshold value is increased, the lateral safety device threshold value is reduced after a predetermined period of time.

3. A method for activating safety devices of a vehicle, comprising the steps of:

generating with a first impact sensor a longitudinal motion signal representing a motion in a longitudinal direction of the vehicle;

generating with a second impact sensor a lateral motion signal representing a motion in the lateral direction of the vehicle;

determining with a processing device whether one of the longitudinal motion signal and a signal derived therefrom exceeds a defined longitudinal threshold value;

determining with the processing device whether one of the lateral motion signal and a signal derived therefrom exceeds lateral threshold value, wherein if the longitudinal threshold value has been exceeded, the lateral threshold value is set higher than a lateral threshold value when the longitudinal threshold value has not been exceeded; and

activating at least one of the safety devices when the lateral threshold value is exceeded.

4. The method as claimed in claim 3, wherein, after the lateral threshold value is set higher than the normal lateral threshold value, the lateral threshold value is reduced after a predetermined period of time.

5. The method as claimed in claim 3, wherein at least one safety device activated when the lateral threshold is exceeded is a side air bag.

6. An apparatus for activating safety devices of a vehicle, comprising:

a first impact sensor for generating a longitudinal motion signal representing a motion in a longitudinal direction of the vehicle;

a second impact sensor for generating a lateral motion signal representing a motion in the lateral direction of the vehicle; and

a processing device, wherein the processing device

determines whether one of the longitudinal motion signal and a signal derived therefrom exceeds a defined longitudinal threshold value;

determines whether one of the lateral motion signal and a signal derived therefrom exceeds lateral threshold value,

sets the lateral threshold value higher if the longitudinal threshold value has been exceeded than a lateral threshold value set when the longitudinal threshold value has not been exceeded, and

activates at least one of the safety devices when the lateral threshold value is exceeded.

7. The safety device activating apparatus as claimed in claim 6, wherein, after the lateral threshold value is set higher, the lateral threshold value is reduced after a predetermined period of time.

8. The safety device activating apparatus as claimed in claim 6, wherein at least one safety device activated when the lateral threshold is exceeded is a side air bag.