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Forced passive anti-hijack security system

  • US 5,739,749 A
  • Filed: 09/23/1996
  • Issued: 04/14/1998
  • Est. Priority Date: 09/23/1996
  • Status: Expired due to Fees
First Claim
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1. An anti-hijack security system, comprising:

  • an ignition switch adapted for detecting whether an ignition of an engine of a vehicle is turned on or turned off;

    a door sensing means comprising a plurality of door sensors adapted for detecting whether doors of said vehicle are opened or closed; and

    a control unit which comprises a central processing unit which is connected to said ignition switch and said door sensors, said central processing unit having built-in a first and a second timer, said first timer starting to count as soon as said ignition switch is turned off, and said second timer starting to count as soon as said ignition switch is turned off and said door sensing means detects one of the doors of said vehicle is opened and then closed, and that said first timer stops and resets only when said ignition switch is turned on, and that while said second timer stops and resets when one of said doors of said vehicle is detected by said door sensing means to be opened and restarts to count when said door is closed back, and that said second timer also stops and resets when said ignition switch is turned on, in which whichever of said first and second timers finish counting first, said anti-hijack security system is automatically armed from a disarmed mode to an armed mode, said central processing unit further comprising an arm/disarm switch for selectively and manually setting said anti-hijack security system between said armed mode and said disarmed mode; and

    thatsaid anti-hijack security system further employing a first and a second armed timer, during said armed mode, said first armed timer being only started counting after said ignition switch is turned on and one of said doors has been detected by said door sensing means to be opened and closed, moreover when said the ignition switch is turned off during a countdown of said first armed timer, said first armed timer is put in standby and would only continue counting when said ignition switch is turned back on, said first armed timer being stopped and reset when said door is detected to be opened and being restarted counting when said door is detected to be closed back, and thatsaid second armed timer starts counting after said ignition switch is turned on and one of said doors has been detected by said door sensing means to be opened, wherein when said ignition switch is turned off during a countdown of said second armed timer, said second armed timer is put in standby and would only continue counting when said ignition switch is turned back on, therefore whichever of said first and second armed timers finish counting first, said central processing unit enables an anti-hijack triggered sequence for sounding a siren and flashing parking lights of said vehicle, and that either manually setting said arm/disarm switch to said disarmed mode or keying in a security code into said central processing unit, said anti-hijack triggered sequence is disabled and said anti-hijack security system is put in said disarmed mode.

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