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Automobile intruder alarm system

  • US 4,866,417 A
  • Filed: 04/24/1987
  • Issued: 09/12/1989
  • Est. Priority Date: 04/24/1987
  • Status: Expired due to Term
First Claim
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1. A method of protecting a vehicle from theft, burglary and vandalism, comprising in combination:

  • providing an alarm system with a motion sensor, and a processor with memory;

    while the alarm system is armed, sensing motion affecting the vehicle;

    measuring the magnitude of each motion;

    comparing the magnitude with a preprogrammed threshold contained within the processor memory;

    counting the number of motions during a selected time interval to determine a rate;

    comparing the rate of motions with a preprogrammed threshold rate stored in the processor memory;

    producing a short warning for each motion sensed that has a magnitude below the programmed threshold stored in the processor memory;

    producing a longer warning than the short warning for each motion sensed that has a magnitude above the preprogrammed threshold stored in the processor memory; and

    producing a longer warning than the short warning each time the rate of motions exceeds the threshold rate stored in the processor memory.

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