Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1995-11-14
1997-07-15
Swarthout, Brent A.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
340428, 340542, 34082536, 307 102, 180287, B60R 2510, B60R 2500
Patent
active
056487541
ABSTRACT:
A car security system capable of sending out an alarm when a car door is opened by an unauthorized person comprises a power stabilizing circuit for providing working DC power for the security system, a signal amplifying circuit for detecting small voltage change signals in the car battery and for generating therefrom an amplified signal, an alarm circuit including a buzzer and a controlling transistor, a microprocessor for receiving and then evaluating the amplified signal. In operation, when a car door is opened, a voltage change signal is produced, which is then detected for evaluating whether the opening of car door is authorized. If a voltage change signal is detected during conditions other than the car door opening, it is identified as a false alarm.
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Swarthout Brent A.
Trieu Van T.
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