Impact event countermeasure control method and system for automotive vehicle
An impact event countermeasure control method and system for an automotive vehicle includes management of impact countermeasures using not only variable timing responsive to impact severity, but also event control as a function of the displacement of a vehicle's occupant with respect to the passenger cabin environment, including various countermeasure devices.
1. An impact event countermeasure control method for an automotive vehicle, comprising the steps of:
sensing deceleration of the vehicle during an impact event;
setting a countermeasure deployment timer in the event that said sensed deceleration exceeds a first threshold;
integrating said sensed deceleration to calculate the time-based displacement of an occupant within said vehicle;
comparing the calculated displacement of said occupant with a displacement threshold at the time said countermeasure deployment timer expires; and
in the event that said calculated displacement is less than said displacement threshold when said countermeasure deployment timer expires, delaying deployment of a countermeasure until said displacement threshold is crossed.
2. A method according to claim 1 , wherein said first threshold comprises a seatbelt pre-tensioner threshold.
3. A method according to claim 1 , wherein the setting of said countermeasure deployment timer lags the onset of said impact event by an amount of time corresponding to the severity of the impact event.
4. A method according to claim 1 , wherein said displacement threshold is calculated as a function of at least a seat usage characteristic of said occupant.
5. A method according to claim 4 , wherein said seat usage characteristic comprises a longitudinal position at which a seated occupant places a seat.
6. A method according to claim 1 , wherein a family of displacement thresholds is calculated for a plurality of occupant seat usage characteristics.
7. A method according to claim 1 , wherein in the event that said calculated displacement is greater than said displacement threshold when said countermeasure deployment timer expires, said countermeasure will be deployed when said countermeasure timer times out.
8. A method according to claim 1 , wherein said countermeasure comprises a multi-load level (MLL) seatbelt retractor.
9. A method according to claim 1 , wherein said countermeasure comprises an adaptive steering column (ASC).
10. A method according to claim 1 , wherein said countermeasure comprises an adaptive airbag tether (AAT).
11. A method according to claim 1 , wherein said countermeasure comprises an adaptive airbag canister vent (ACV).
12. An impact event countermeasure control system for an automotive vehicle, comprising:
a sensor for determining the deceleration of the vehicle during an impact event;
a countermeasure deployment timer which is set in the event that the determined deceleration exceeds a first threshold;
an integrator using said sensed deceleration to calculate the time-based displacement of an occupant within said vehicle;
a comparator for comparing the calculated displacement of said occupant with a displacement threshold at the time said countermeasure deployment timer expires; and
a controller, comprising said countermeasure deployment timer, said integrator, and said comparator, with said controller deploying an impact countermeasure in the event that said calculated displacement is greater than said displacement threshold when said countermeasure timer expires.
13. A countermeasure control system according to claim 12 , wherein said countermeasure comprises a multi-load level (MLL) seatbelt retractor.
14. A countermeasure control system according to claim 12 , wherein said countermeasure comprises an adaptive steering column (ASC).
15. A countermeasure control system according to claim 12 , wherein said countermeasure comprises an adaptive airbag tether (AAT).
16. A countermeasure control system according to claim 12 , wherein said countermeasure comprises an adaptive airbag canister vent (ACV).
17. A countermeasure control system according to claim 12 , wherein said displacement is determined with respect to the location of a countermeasure device within said vehicle.