Method for activating an occupant restraint in a vehicle

Details Method for activating an occupant restraint in a vehicle Method for activating an occupant restraint in a vehicle

B - Operations, Transporting

60

R

B60R 21/01 (2006.01) B60R 21/32 (1995.01)

Patent

CA 2140055

A method for activating an impact responsive device in a passenger vehicle is provided wherein a single point sensing device senses deceleration of the vehicle during an impact event. The sensed deceleration is integrated to determine velocity of the vehicle. The velocity is then integrated to determine displacement of the vehicle. The difference between the deceleration and a preselected deceleration bias is integrated over displacement to provide a residual energy density. This residual energy density is compared to the threshold residual energy density from a predefined activation threshold line which is selected based on the impact characteristics of the vehicle. When the residual energy density is equal to or exceeds the activation threshold line, the impact responsive device is activated.

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