Soil trip vehicle rollover detection method

• US 7,412,314 B2
• Filed: 09/14/2004
• Issued: 08/12/2008
• Est. Priority Date: 09/14/2004
• Status: Active Grant

• Current Assignee: Aptiv Technologies AG
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Schubert, Peter J.
• Primary Examiner(s): Keith; Jack W
• Assistant Examiner(s): Nguyen; Chuong P
• Application Number:
  US10/940,397
• Publication Number:
  US 20060058933A1
• Time in Patent Office: 1,428 Days
• Field of Search: 280 5501- 5507, 280/755, 701/38, 701/39, 701/45, 701/46, 701/70, 340/429, 340/440
• US Class Current: 701/38
• CPC Class Codes: B60G 17/0162 mainly during a motion involving steering operation, e.g. cornering, overtaking B60G17/0164 takes precedence
• CPC Class Codes: B60G 17/018 characterised by the use of a specific signal treatment or control method
• CPC Class Codes: B60G 17/0195 characterised by the regulation being combined with other vehicle control systems conjoint control of vehicle sub-units including control of suspension systems B60W10/22
• CPC Class Codes: B60G 2400/0521 Roll rate
• CPC Class Codes: B60G 2400/104 lateral or transversal with regard to vehicle
• CPC Class Codes: B60G 2800/0124 Roll-over conditions
• CPC Class Codes: B60G 2800/922 EBV - Electronic brake force distribution
• CPC Class Codes: B60G 2800/925 Airbag deployment systems
• CPC Class Codes: B60G 2800/94 Electronic Stability Program (ESP, i.e. ABS+ASC+EMS)
• CPC Class Codes: B60P 1/045 Levelling or stabilising systems for tippers suspensions with levelling or stabilising means for vehicles in general B60G17/00, B60G21/00, using ground-engaging vehicle fittings B60S9/00
• CPC Class Codes: B60P 3/225 Adaptations for pumps or valves
• CPC Class Codes: B60T 2230/03 Overturn, rollover

Abstract

Impending rollover events are detected by recognizing a plow phase increase in lateral acceleration, coupled with a significant trip phase roll rate. The plow phase increase is recognized by modeling a typical soil trip lateral acceleration characteristic and computing a cross-correlation between the measured lateral acceleration and the modeled acceleration. The correlation is compared to a threshold that varies with the measured roll rate to reliably discriminate rollover events from near-rollover events while enabling timely deployment of suitable occupant restraints.

Claims

1. A method of detecting an impending soil trip rollover event of a vehicle, comprising the steps of:

determining a roll rate and a lateral acceleration of the vehicle;

sampling the determined lateral acceleration and buffering a plurality of sampled values to create a measured lateral acceleration profile;

modeling a reference lateral acceleration profile characteristic of a plow phase of a soil trip rollover event for said vehicle;

cross-correlating said measured and modeled lateral acceleration profiles and identifying a first peak correlation value;

establishing a correlation threshold that decreases with increasing values of the determined roll rate; and

detecting the impending rollover event when said first peak correlation value crosses said correlation threshold.

wherein said modeled lateral acceleration profile spans a predefined time interval, and increases linearly with time.

2. The method of claim 1, wherein said correlation threshold associates a maximum value of said peak correlation value with a minimum measured vehicle roll rate.

3. The method of claim 1, including the step of:

filtering the sampled lateral acceleration values and buffering a plurality of filtered values to create said first lateral acceleration profile.

4. The method of claim 1, including the steps of:

inverting said modeled lateral acceleration profile;

cross-correlating said measured and inverted modeled lateral acceleration profiles and identifying a second peak correlation value; and

detecting the impending rollover event when said first or second peak correlation values cross said correlation threshold.

5. A method of detecting a plow phase of an impending soil trip event of a vehicle, comprising the steps of:

determining a roll rate and a lateral acceleration of the vehicle;

sampling the determined lateral acceleration and buffering a plurality of sampled values to create a first lateral acceleration profile;

establishing a second lateral acceleration profile characteristic of a plow phase of a soil trip rollover event;

cross-correlating said first and second lateral acceleration profiles and identifying a first peak correlation value;

establishing a correlation threshold that decreases with increasing values of the determined roll rate; and

detecting an impending soil trip event when said first peak correlation value crosses said correlation threshold.