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Vehicle security system with controller proximity sensor

  • US 5,334,969 A
  • Filed: 06/30/1992
  • Issued: 08/02/1994
  • Est. Priority Date: 07/10/1991
  • Status: Expired due to Term
First Claim
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1. A vehicle security system, comprising:

  • a proximity sensor having variable sensitivity to cover a corresponding monitored area and producing a detection signal upon detecting motion in the monitored area;

    a sensitivity control circuit for varying the sensitivity of said proximity sensor;

    a monitoring and alarming control circuit for monitoring and alarming control in response to an output from said proximity sensor;

    an alarm device for performing one of a plurality of alarming operations under control of said monitoring and alarming control circuit;

    said proximity sensor, said sensitivity control circuit, said monitoring and alarming control circuit and said alarm device being adapted for mounting on a vehicle;

    wherein said sensitivity control circuit, upon operation of the system, automatically varies the sensitivity of said proximity sensor to set the sensitivity to a level under which level an environment of a monitored area corresponding to said set sensitivity level does not cause said proximity sensor to produce said detection signal; and

    wherein said monitoring and alarming control circuit determines that an abnormal state has occurred and performs an alarming control operation to cause the alarm device to perform a predetermined alarming operation, upon a receipt of said detection signal from said proximity sensor after the setting of the sensitivity level;

    and wherein said sensitivity control circuit finds a maximum sensitivity level corresponding to a maximum monitored area an environment of which does not cause said proximity sensor to produce said detection signal, and sets the sensitivity of said proximity sensor to the maximum sensitivity level.

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