Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1992-06-30
1994-08-02
Peng, John K.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
340429, 340551, 340554, 340541, 340565, 340506, 367 94, 342 92, 342 93, 307 91, 307 102, 180173, 379 40, B60R 2510
Patent
active
053349695
ABSTRACT:
A car security system has a proximity sensor such as a radar sensor with variable sensitivity and capable of producing a detection signal upon detecting motion of a person in a monitoring area. A control circuit is provided controls the sensitivity of said proximity sensor. The system also has a monitoring/alarming control circuit for control of predetermined monitoring and alarming control on the basis of the output from the proximity sensor, and alarming devices such as a headlight flash circuit, buzzer and siren for performing a predetermined alarming operation under the control of the monitoring/alarming control circuit. The sensitivity control circuit operates in response to a predetermined operation such as an arming start operation to vary the sensitivity of the proximity sensor so as to automatically set the sensitivity to a first sensitivity level which is the highest level within a range which does not cause the sensor to produce the detection output. The monitoring/alarming control circuit determines that an abnormal state has occurred and performs a predetermined alarming control upon receipt of the detection signal from said proximity sensor after completion of setting of the sensitivity level.
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Abe Koichi
Murata Mitsuhiro
Alpine Electronics Inc.
Bever Patrick T.
Klivans Norman R.
Peng John K.
Shoup Guy W.
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