Patent ID: 6125313
Filing Date: 2000-09-26
Classification: B60R,G01P

Abstract:
In a motor vehicle having a seat mounted on a vehicle floor and an air-bag for protecting a passenger seated on the seat, a control circuit for controlling actuation of said air-bag, comprising:an acceleration sensor mounted in the vehicle for producing an acceleration signal indicative of acceleration of the vehicle;a judgment circuit for processing said acceleration signal to calculate a timing-based signal and issuing an ignition signal to actuate said air-bag when the value of said timing-based signal exceeds a reference value;a seating condition sensing circuit which senses a seating condition of the passenger that is assumed just before occurrence of said acceleration; anda correcting circuit for correcting said reference value in accordance with the passenger seating condition sensed by said seating condition sensing circuit,wherein said judgment circuit comprises an estimating circuit which estimates a displacement of a mass of the seated passenger upon occurrence of said acceleration.