Keyless entry system for automotive devices with compact, portable wireless code transmitter, and feature for preventing users from locking transmitter in vehicle

  • US 4,672,375 A
  • Filed: 04/10/1985
  • Issued: 06/09/1987
  • Est. Priority Date: 11/29/1983
  • Status: Expired due to Term
First Claim
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1. A keyless entry system for an automotive vehicle for operating various vehicle devices including a door lock, comprising:

  • a portable wireless transmitter adapted to transmit a unique code-indicative radio signal encoded to carry a preset unique code stored in said transmitter;

    a controller mounted on the vehicle and receiving the unique code-indicative radio signal, comparing the received unique code with a second preset code, and producing a control signal only when the received unique code matches said second preset code;

    a plurality of actuators, each associated with a corresponding plurality of vehicle devices for operating the latter to desired operating states, said actuators including a door lock actuator for operating a vehicular door lock between a locked and an unlocked position;

    a plurality of manual switches, each switch actuating said controller for signalling the keyless entry system to operate a corresponding one of said vehicle devices, said manual switches including a door lock switch for reversing the position of said door lock actuator between said locked and unlocked positions;

    a first detector for detecting a closed position of a vehicle door;

    a second detector for detecting a locked position of said door lock actuator; and

    a disabling means activated when the vehicle door is closed and the door lock is locked and cyclically or sequentially triggering said transmitter while the vehicle door is closed and the door lock is locked, and responding to continuous or cyclic reception of said unique code-indicative signal for a predetermined period of time from detection of locking of said door lock to disable operation of said controller for operating said door lock actuator, said disabling means responsive to the presence of a user in the vehicle and maintaining said controller disabled when said user is present in the vehicle.

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