Inclination angle detection apparatus and automobile theft alarm apparatus using the same
First Claim
1. An inclination angle detection apparatus comprising:
- a sensor for sensing the angle of inclination;
a differential amplifier for amplifying an output of the sensor;
an offset compensating circuit which supplies a reference voltage to an input terminal of the differential amplifier by comparing an output of the differential amplifier with a constant value and integrating a differential output resulting from subtraction between the output of the differential amplifier and the constant value;
a switching means to increase a time constant for increasing the total integration time constant of the offset compensating circuit so as to be greater than the time constant of integrating elements thereof by intermittently supplying the output of the differential amplifier to the offset compensating circuit; and
a means for detecting the angle of inclination in response to the output of the differential amplifier.
1 Assignment
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Accused Products
Abstract
An automobile theft alarm apparatus for detecting the variation of the inclination angle of the automobile includes: a sensor of a bridge configuration mounted in the automobile for sensing the angle of inclination of the automobile; a differential amplifier for amplifying the output of the sensor; an offset compensating circuit which produces a reference voltage for the differential amplifier by comparing the output of the differential amplifier with a constant value and by then integrating the differential output; an alarm device for issuing an alarm when the output of the differential amplifier exceeds a predetermined value; and a switching device for increasing a time constant for making the total integration time constant for the offset compensating circuit larger than the time constant of the integrating elements thereof by intermittently supplying the output of the differential amplifier to the offset compensating circuit. The integration time constant of the offset compensating circuit which supplies the reference voltage to the differential amplifier for amplifying the output of the sensor can be set at a required value even when using a small-capacitance capacitor.
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Citations
14 Claims
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1. An inclination angle detection apparatus comprising:
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a sensor for sensing the angle of inclination; a differential amplifier for amplifying an output of the sensor; an offset compensating circuit which supplies a reference voltage to an input terminal of the differential amplifier by comparing an output of the differential amplifier with a constant value and integrating a differential output resulting from subtraction between the output of the differential amplifier and the constant value; a switching means to increase a time constant for increasing the total integration time constant of the offset compensating circuit so as to be greater than the time constant of integrating elements thereof by intermittently supplying the output of the differential amplifier to the offset compensating circuit; and a means for detecting the angle of inclination in response to the output of the differential amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An automobile theft alarm apparatus comprising:
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a sensor mounted in the automobile for sensing the angle of inclination; a differential amplifier for amplifying an output of the sensor; an offset compensating circuit which supplies a reference voltage to an input terminal of the differential amplifier by comparing an output of the differential amplifier with a constant value and integrating a differential output resulting from subtraction between the output of the differential amplifier and the constant value; a switching means for increasing a time constant for increasing the total integration time constant of the offset compensating circuit so as to be greater than the time constant of integrating elements thereof by intermittently supplying the output of the differential amplifier to the offset compensating circuit; and an alarm means for issuing an alarm when the output of the differential amplifier exceeds a predetermined value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification