Crash/non-crash discrimination using frequency components of acc

Details Crash/non-crash discrimination using frequency components of acc Crash/non-crash discrimination using frequency components of acc

1993-09-21

1995-07-25

Teska, Kevin J.

Boots, shoes, and leggings

180282, 340436, 280735, B60R 2132

Patent

active

054368383

ABSTRACT:
In a crash detection apparatus, the output signal of an accelerometer is integrated at intervals and a velocity signal is produced. Those frequency components of the accelerometer output which appear uniquely during a vehicle crash are extracted and their amplitude is squared to produce an impact energy signal. An airbag is operated when the velocity signal exceeds a first threshold, or when a sum of the velocity and impact energy signals exceeds a second threshold, or operated when the impact energy signal exceeds a third threshold. In a modified embodiment, the accelerometer output is integrated both at longer and shorter intervals to produce a long-term and a short-term velocity signal. The airbag is operated when the long-term velocity signal exceeds a first threshold, or when the short-term velocity signal and the impact energy signal simultaneously exceed a second and a third threshold, respectively.

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