Dynamic quantity sensor
First Claim
1. A dynamic quantity sensor comprising:
- a signal generating section for generating a detection signal having a signal level representing an applied dynamic quantity; and
a signal correcting section for correcting said detection signal produced from said signal generating section in such a manner that an unapplied level of said detection signal to be obtained when said dynamic quantity is not applied is equalized to a predetermined reference level, wherein said dynamic quantity sensor has a failure mode in which an output of said signal generating section is fixed to said reference level, and said signal generating section adjusts the detection signal in such a manner that said signal correcting section generates a large correction amount sufficient for the output signal from said signal correcting section to deviate from a failure judgment unable region including said reference level in case of failure corresponding to said failure mode.
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Accused Products
Abstract
A sensor element includes a pair of differential capacitors having capacitances C1 and C2 causing a complementary capacitance change in response to an applied acceleration. An additional capacitor is connected to either capacitor to generate a capacitance difference between the capacitance C1 and the composite capacitance C2+C3. This enables to adjust an input LPFout of a correcting circuit correcting the offset level of the sensor output Gout in such a manner that a correction amount in the correcting circuit becomes large and accordingly deviates sufficiently from a reference level Vref. In case of failure in which the input of the correcting circuit is fixed to the reference level Vref, the sensor output Gout surely deviates from the reference level Vref by an amount equivalent to the correction in the correcting circuit.
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Citations
4 Claims
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1. A dynamic quantity sensor comprising:
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a signal generating section for generating a detection signal having a signal level representing an applied dynamic quantity; and
a signal correcting section for correcting said detection signal produced from said signal generating section in such a manner that an unapplied level of said detection signal to be obtained when said dynamic quantity is not applied is equalized to a predetermined reference level, wherein said dynamic quantity sensor has a failure mode in which an output of said signal generating section is fixed to said reference level, and said signal generating section adjusts the detection signal in such a manner that said signal correcting section generates a large correction amount sufficient for the output signal from said signal correcting section to deviate from a failure judgment unable region including said reference level in case of failure corresponding to said failure mode. - View Dependent Claims (2, 3, 4)
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Specification