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Closure system with adjustable sensitivity

  • US 5,517,189 A
  • Filed: 10/31/1994
  • Issued: 05/14/1996
  • Est. Priority Date: 12/21/1990
  • Status: Expired due to Term
First Claim
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1. A closure system for a lock of a motor vehicle, said closure system being remotely controllable by transmitter signals, comprising:

  • at least one portable transmitter for emitting transmitter signals activating the lock;

    a predetermined range around said motor vehicle within which said transmitter must be located for controlling the closure system, said predetermined range having an upper limit and a lower limit, a distance between said motor vehicle and said upper limit of said predetermined range being less than a distance over which the transmitter can physically transmit;

    a receiver for receiving the emitted transmitter signals, the receiver triggering a control signal in response to receiving the emitted transmitter signals when the transmitter is located in said predetermined range;

    a locking element which is controlled by the control signal and by means of which the lock is activated;

    the receiver measuring a signal strength of the received transmitter signals, comparing a measured value of signal strength to a rated value stored in the receiver and setting a reception sensitivity of the receiver dependent on a result of the comparison of the measured value of signal strength to the rated value, the reception sensitivity being reduced when the measured value of signal strength exceeds the rated value such that the lock is activatable only when the transmitter is located within said predetermined range.

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