Acceleration sensor having fault diagnosing device
First Claim
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1. An acceleration sensor comprising:
- an acceleration detecting portion comprising a piezoelectric element having electrodes on both its surfaces for outputting a signal corresponding to acceleration applied thereto and a supporting base for supporting said piezoelectric element;
said acceleration detecting portion being provided with a pair of detecting portions arranged so as to be brought into contact with said piezoelectric element and spaced apart from each other by a predetermined distance;
a signal processor electrically connected to one of the electrodes of said piezoelectric element and for processing the electric signal outputted from the piezoelectric element; and
a signal outputting device electrically connected to one of said pair of detecting portions so as to cause a predetermined current to flow between said detecting portions and connected to said signal processor so as to output to the signal processor a state signal representing the state of the acceleration detecting portion,said signal outputting device outputting said state signal in conformity with the variation of the current flowing between the detecting portions.
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Abstract
An acceleration sensor includes a piezoelectric element for outputting an electric signal corresponding to acceleration applied thereto, a signal processor for processing a signal outputted from the piezoelectric element, an AC signal outputting device for receiving an externally inputted signal and generating an AC signal which is synchronized with the period of the timing signal in response to receipt of the timing signal and for applying the AC signal to the piezoelectric element, and a capacitor connected between the AC signal outputting device and the piezoelectric element for detecting a fault in the acceleration sensor.
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Citations
13 Claims
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1. An acceleration sensor comprising:
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an acceleration detecting portion comprising a piezoelectric element having electrodes on both its surfaces for outputting a signal corresponding to acceleration applied thereto and a supporting base for supporting said piezoelectric element; said acceleration detecting portion being provided with a pair of detecting portions arranged so as to be brought into contact with said piezoelectric element and spaced apart from each other by a predetermined distance; a signal processor electrically connected to one of the electrodes of said piezoelectric element and for processing the electric signal outputted from the piezoelectric element; and a signal outputting device electrically connected to one of said pair of detecting portions so as to cause a predetermined current to flow between said detecting portions and connected to said signal processor so as to output to the signal processor a state signal representing the state of the acceleration detecting portion, said signal outputting device outputting said state signal in conformity with the variation of the current flowing between the detecting portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification