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Method for detecting an identifier for starting a motor vehicle

  • US 10,169,941 B2
  • Filed: 09/08/2015
  • Issued: 01/01/2019
  • Est. Priority Date: 09/08/2014
  • Status: Active Grant
First Claim
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1. A method for detecting an identifier for starting a motor vehicle, said motor vehicle comprising a first antenna and said identifier comprising a second antenna, said method comprising:

  • transmitting, by said first antenna, a first Bluetooth Low Energy™

    signal toward said identifier at a nominal power;

    measuring the power of a corresponding Bluetooth Low Energy™

    signal received by the second antenna of said identifier;

    comparing said measured power with a threshold power corresponding to a threshold distance from said first antenna using a regression curve of power as a function of distance;

    determining whether the measured power is greater than or equal to said threshold power;

    enabling the starting of the motor vehicle when the measured power is greater than or equal to said threshold power;

    positioning said identifier at a reference position; and

    adjusting the second antenna of the identifier for use with the first antenna on the first use of the identifier with the motor vehicle, and/or on request;

    wherein;

    the first antenna is placed at a predefined distance from the reference position of the motor vehicle and the adjustment comprises;

    transmitting, by the first antenna, a first calibration signal at the nominal power toward the second antenna,measuring the power of a corresponding reception signal received by the second antenna, and sending the measured power toward said first antenna,comparing the measured power with a theoretical power corresponding to said predefined distance, using a regression curve of power as a function of distance,determining whether there is an offset between said measured power and said theoretical power, andwhen the offset exists, modifying the nominal power of the first transmitted Bluetooth Low Energy™

    signal as a function of said offset, or modifying the threshold power as a function of said offset,the threshold distance is smaller than a radius of a circle inscribed in the passenger compartment of the motor vehicle, said circle being centered on said first antenna, andthe regression curve is a substantially exponential decaying curve.

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