Method and system for detecting a vehicle rollover, in particular a soil trip rollover

• US 20090037057A1
• Filed: 08/01/2008
• Published: 02/05/2009
• Est. Priority Date: 08/02/2007
• Status: Active Grant

• Current Assignee: Aptiv Technologies AG (Aptiv PLC)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Meijer, Maciej, Sygnarowicz, Daniel
• Granted Patent: US 8,046,135 B2
• Time in Patent Office: Days
• US Class Current: 701/46
• CPC Class Codes: B60G 17/0163 the control involving steering geometry, e.g. four-wheel steering
• CPC Class Codes: B60G 17/018 characterised by the use of a specific signal treatment or control method
• CPC Class Codes: B60G 2400/104 lateral or transversal with regard to vehicle
• CPC Class Codes: B60G 2800/9124 Roll-over protection systems, e.g. for warning or control
• CPC Class Codes: B60R 2021/0018 Roll-over
• CPC Class Codes: B60R 2021/01322 comprising variable thresholds, e.g. depending from other collision parameters
• 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

Abstract

A method and system for detecting a vehicle rollover or dangerous situations that may precede a rollover, in particular a soil trip type rollover includes the following steps, where the steps are performed in loops,

• • (a) determining a lateral acceleration of the vehicle,
  • (b) calculating an acceleration differential value on the basis of the lateral accelerations determined in at least two steps (a),
  • (c) determining a possibility of a rollover of the vehicle on the basis of the lateral acceleration determined in at least one step (a) and the acceleration differential value calculated in at least one step (b),
  • (d) generating an output activation signal at least on the basis of a possibility of a rollover of the vehicle determined in a step (c).

Claims

1. A method of detecting a vehicle rollover comprising the steps of

(a) determining a lateral acceleration of the vehicle,

(b) calculating an acceleration differential value on the basis of the lateral accelerations determined in at least two steps (a),

(c) determining a possibility of a rollover of the vehicle on the basis of the lateral acceleration determined in at least one step (a) and the acceleration differential value calculated in at least one step (b),

(d) generating an output activation signal at least on the basis of a possibility of a rollover of the vehicle determined in a step (c),

where the steps are performed in loops.

2. The method according to claim 1, characterized in that, a possibility of a rollover of the vehicle is determined in a step (c) on the basis of the lateral accelerations of the vehicle determined in at least two steps (a) and acceleration differential values calculated in at least two steps (b).

3. The method according to claim 1, characterized in that, the acceleration differential value is calculated in current step (b) as a difference between the lateral acceleration of the vehicle value determined in current step (a) and the lateral acceleration of the vehicle determined in at least one of the previous steps (a).

4. The method according to claim 1, characterized in that, step (c) comprises the consecutive steps of:

(i) setting a first flag if it is unset and the acceleration differential value calculated in a step (b) is higher than a predefined first slope threshold,

(ii) setting a second flag if it is unset and the first flag is set and the acceleration differential value calculated in a step (b) is lower than a predefined second slope threshold and the lateral acceleration of the vehicle determined in a step (a) is higher than a predefined second acceleration threshold,

(iii) setting a third flag if it is unset and the second flag is set and the acceleration differential value calculated in a step (b) is higher than a predefined third slope threshold,

which steps are performed consecutively as long as the vehicle lateral acceleration value determined in a step (a) exceeds a predefined first acceleration threshold and if the lateral acceleration of the vehicle determined in a step (a) is lower than the predefined first acceleration threshold, all the flags are unset,

while a rollover of the vehicle is determined as possible in a step (c) as long as the third flag is set.

5. The method according to claim 4, characterized in that, all the flags are additionally unset if the acceleration differential value calculated in a step (b) is negative and the third flag is set.

6. The method according to claim 1, further comprising

(e) determining the roll acceleration of the vehicle;

and

(f) determining a possibility of a rollover of the vehicle on the basis of the roll acceleration of the vehicle determined step (e) and lateral acceleration of the vehicle determined in step (a), where the output activation signal is generated in step (d) additionally on the basis of a possibility of a rollover of the vehicle determined in a step (f).

7. The method according to claim 6, characterized in that, step (f) comprises the consecutive steps of

(i) unsetting a fourth flag if it is set and the roll acceleration of the vehicle determined in a step (e) is higher than a predefined roll acceleration threshold, and

(ii) setting the fourth flag if it is unset and the lateral acceleration of the vehicle determined in a step (a) is lower than a third predefined acceleration threshold,

while a rollover of the vehicle is determined as possible in a step (f) as long as the fourth flag is set.

8. The method according to claim 4, characterized in that, the first flag, the second flag and the third flag are initially unset and the fourth flag is initially set.

9. The method according to claim 6, characterized in that, at least one of the values determined in a step (a) or a step (e) or calculated in a step (b) is preprocessed, where preprocessing preferably involves at least signal scaling, removing a signal drift and/or filtering a signal.

10. The method according to claim 1, further comprising activating at least one protection device for an occupant of the vehicle on the basis of the output activation signal generated in step (d).

11. A system of detecting a vehicle rollover comprising means for

(a) determining a lateral acceleration of the vehicle,

(b) calculating an acceleration differential value on the basis of the lateral accelerations determined in at least two steps (a),

(c) determining a possibility of a rollover of the vehicle on the basis of the lateral acceleration determined in at least one step (a) and the acceleration differential value calculated in at least one step (b),

(d) generating an output activation signal at least on the basis of a possibility of a rollover of the vehicle determined in a step (c),

where the steps are performed in loops.

12. A media comprising a program of computer-implementable code for

(a) determining a lateral acceleration of the vehicle,

(b) calculating an acceleration differential value on the basis of the lateral accelerations determined in at least two steps (a),

(c) determining a possibility of a rollover of the vehicle on the basis of the lateral acceleration determined in at least one step (a) and the acceleration differential value calculated in at least one step (b),

(d) generating an output activation signal at least on the basis of a possibility of a rollover of the vehicle determined in a step (c),

where the steps are performed in loops.