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Keyless motor vehicle starting system with anti-theft feature

  • US 5,689,142 A
  • Filed: 05/24/1996
  • Issued: 11/18/1997
  • Est. Priority Date: 05/24/1996
  • Status: Expired due to Fees
First Claim
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1. A keyless motor vehicle starting system comprising:

  • a motor starter;

    a solenoid on said motor starter;

    an ignition circuit;

    a vehicle battery;

    additional motor vehicle electrical components which are not relied-upon to energize/enable said motor starter and said ignition circuit;

    a portable wireless transmitter which comprises;

    (a) a battery;

    (b) a power-code switch connected to said battery;

    (c) a starter-code switch connected to said battery;

    (d) a power-code generator which is connected to said power-code switch and generates a power-code when said power-code switch is turned on;

    (e) a starter-code generator which is connected to said starter-code switch and generates a starter-code when said starter-code switch is turned on;

    (f) an OR-gate which combines said starter-code and said power-code;

    (g) an electromagnetic-wave modulator which generates an electromagnetic-wave signal modulated by the output of said OR-gate;

    (h) an electromagnetic-wave transmitting means connected to the output-pin of said electromagnetic-wave modulator;

    a receiver/controller board which comprises;

    (a) an electromagnetic-wave receiving means which generates a received electromagnetic-wave signal;

    (b) an electromagnetic-wave demodulator whose input-pin is connected to said electromagnetic-wave receiving means;

    (c) a starter-code detector which generates a detected-starter-code-signal and has an input-pin which is connected to the output-pin of said electromagnetic-wave demodulator;

    (d) a power-code detector which generates a detected-power-code-signal and has an input-pin which is connected to the output-pin of said electromagnetic-wave demodulator;

    (e) a power switch which is controlled by said detected-power-code-signal and is connected between said vehicle battery and said ignition circuit;

    (f) a starter switch which is controlled by said detected-starter-code-signal and is connected between said power switch and said starter solenoid and between said power switch and said additional motor vehicle electrical components;

    wherein said portable wireless transmitter and said receiver/controller board are used to replace an ignition lock, an ignition key and an ignition switch in a conventional motor vehicle.

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