Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1991-04-16
1992-10-13
Crosland, Donnie L.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
340440, 340511, 340566, 340665, 340689, 340683, 200 6145R, 200 6152, 200 52A, 307 91, 307 102, B60R 2510
Patent
active
051554674
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.
REFERENCES:
patent: 4057791 (1977-11-01), Bimmerle et al.
patent: 4359717 (1982-11-01), Huber et al.
patent: 4584569 (1986-04-01), Lopez et al.
patent: 4651128 (1987-03-01), Kolb
patent: 4684928 (1987-08-01), Takahashi et al.
Crosland Donnie L.
Fujitsu Ten Limited
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