Crash sensor
First Claim
1. A crash sensor, which detects crash of a vehicle from an acceleration waveform of an accelerometer, to trigger a passenger protecting apparatus called an air bag with a trigger circuit, comprising:
- means for peak cutting any portion of the input acceleration waveform lower than a predetermined value,means for time integrating the value obtained by the said peak cutting means,means for subtracting a time integrated value of a predetermined function from the value obtained by the said time integration,means for a first comparing the value obtained by the said subtraction with a predetermined time function value to develop a triggering signal,means for second comparing a differential of the values obtained by said subtraction per a predetermined time value with a predetermined value to develop a triggering signal, andmeans for connecting said first comparing means and said second comparing means to the trigger circuit for actuating the airbag.
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Accused Products
Abstract
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.
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Citations
12 Claims
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1. A crash sensor, which detects crash of a vehicle from an acceleration waveform of an accelerometer, to trigger a passenger protecting apparatus called an air bag with a trigger circuit, comprising:
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means for peak cutting any portion of the input acceleration waveform lower than a predetermined value, means for time integrating the value obtained by the said peak cutting means, means for subtracting a time integrated value of a predetermined function from the value obtained by the said time integration, means for a first comparing the value obtained by the said subtraction with a predetermined time function value to develop a triggering signal, means for second comparing a differential of the values obtained by said subtraction per a predetermined time value with a predetermined value to develop a triggering signal, and means for connecting said first comparing means and said second comparing means to the trigger circuit for actuating the airbag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification