Soil trip vehicle rollover detection method
AssigneeDelphi Technologies, Inc.
InventorPeter J. Schubert
Life of this patent
Estimating the term…
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.
Claims5
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.
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.
Dependencies are inferred from the claim text.