Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A crash sensor which detects crash of a vehicle from an acceleration waveform of an accelerometer to trigger operation of a passenger protecting apparatus such as an air bag, comprising means for peak cutting any portion of the inputted acceleration waveform lower than a predetermined value, means for time integrating a value obtained by such peak cutting, means for subtracting a time integrated value of a predetermined function from a value obtained by such time integration, and means for comparing a value obtained by such subtraction with a predetermined time function value to develop a triggering signal.
Claim 2
Dependent Claim
92 words
A crash sensor which detects crash of a vehicle from an acceleration waveform of an accelerometer to trigger operation of a passenger protecting apparatus such as an air bag, comprising means for peak cutting any portion of the inputted acceleration waveform lower than a predetermined value and subtracting another predetermined value from the inputted acceleration waveform, means for time integrating a value obtained by such peak cutting and such subtraction, and means for comparing a value obtained by such time integration with a predetermined time function value to develop a triggering signal.
Claim 3
Dependent Claim
42 words
A crash sensor according to claim 1 or 2, further comprising an AND circuit for receiving a signal indicative of a speed higher than a predetermined level from a speedometer and a signal from said comparing means to develop a triggering signal.
Claim 4
Dependent Claim
32 words
A crash sensor according to claim 1 or 2, wherein the predetermined time function value is varied in response to a speed of said vehicle from a speedometer directly before the crash.
Claim 5
Dependent Claim
23 words
A crash sensor according to claim 1 or 2, wherein a K-th power of an acceleration waveform is inputted as the acceleration waveform.
Claim 6
Dependent Claim
17 words
A crash sensor according to claim 1 or 2, wherein the time integration is n-th time integration.
Claim 7
Dependent Claim
20 words
A crash sensor according to claim 1 or 2, wherein an amplified acceleration waveform is inputted as the acceleration waveform.
Claim 8
Dependent Claim
36 words
A crash sensor according to claim 1 or 2, wherein a waveform obtained by subtraction from an acceleration waveform obtained by means of a filter processing from the acceleration waveform is inputted as the acceleration waveform.
Claim 9
Dependent Claim
36 words
A crash sensor according to claim 1 or 2, wherein the time integrating operation is reset when the time integrated value to be compared with the predetermined time function value comes to a value around zero.