Patent ID: 6305709
Filing Date: 2001-10-23
Classification: B60R

Abstract:
An airbag unit provided in a vehicle, comprising:an acceleration sensor for detecting an acceleration applied to said vehicle as a result of a collision, and generating an acceleration signal corresponding to the detected acceleration;an acceleration-to-speed converting means for inputting said acceleration signal fed from said acceleration sensor and converting it to a speed signal;a crash state judging means for determining the type of collision based on the value of the speed signal fed from said acceleration-to-speed converting means and producing a crash state judging signal indicative of the judged type of collision;first and second threshold generating means each for selecting and outputting a threshold on the basis of said crash state judging signal;a first comparing means for comparing the threshold from said first threshold generating means and said acceleration signal fed from said acceleration sensor, and outputting a first crash signal when said acceleration signal exceeds said threshold;a second comparing means for comparing the threshold from said second threshold generating means and said speed signal fed from said acceleration-to-speed converting means, and outputting a second crash signal when said speed signal exceeds said threshold from said second threshold generating means; andan activation control means for comparing the first crash signal from said first comparing means and the second crash signal from said second comparing means, and outputting an inflation signal for inflation of an airbag provided in said vehicle in response to a predetermined result of said comparison.