Sensor Technology Co., Ltd.

Takeo Shiozawa

Hiroyuki Sada

Hiroshi Moriyama

An electronic crash sensor which can operate appropriately in response to any form of crash of any vehicle, more especially to a high speed oblique or pole crash of a vehicle which has a less rigid body or to a compound crash which is compound of various forms of crash, to say nothing of a high speed oblique or pole crash of a vehicle which has a normal rigid body. An input acceleration waveform from an accelerometer is processed to peak cut any portion thereof lower than a predetermined value. Then, the value obtained by the said peak cutting is time integrated. Then, a time integrated value of a predetermined function is subtracted from the value obtained by the said time integration. Then, the value of the acceleration waveform thus obtained is firstly compared with a predetermined time function value, and when the former is higher than the latter, a triggering signal is developed, while a diffrential of the said values of the acceleration waveform per a predetermined time value is secondly compared with a predetermined value, and when the former is higher than the latter, a triggering signal is developed. And further, the said first comparing means and the said second comparing means are connect with a trigger circuit to trigger a passenger protecing apparatus called an air bag by way of a connecting means.

Crash sensor

An electronic crash sensor which can operate appropriately in response to any form of crash of a vehicle. An input acceleration waveform from an accelerometer is first processed to peak cut any portion thereof lower than a predetermined value. Then, a value obtained such peak cutting is time integrated. Then, a time integrated value of a predetermined function is subtracted from a value obtained by such time integration. Then, the value of the acceleration waveform thus obtained is compared with a predetermined time function value, and when the former is higher than the latter, a triggering signal is delivered to a trigger circuit to trigger operation of a passenger protecting apparatus such as an air bag of the vehicle.

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Kobe, Japan

Takeo Shiozawa