| 摘要 |
<p>In a method for characterizing, by way of at least one primary antenna (13, 31) on board a motor vehicle (10), a portable device (20) of indeterminate type comprising a secondary antenna (21) of indeterminate size, which is moved towards said motor vehicle (10) in an indeterminate approach mode, said primary antenna (13, 31) being intended to communicate with the secondary antenna (21) of the portable device (20) and generating a voltage at its terminals, the voltage being supplied to a system (11) on board the motor vehicle (10), the invention proposes that the method for characterizing comprise the following steps: step 1: measuring the voltage at the terminals of the primary antenna (13, 31) by the on-board system (11) for a succession of predetermined periods of time, step 2: calculating a difference in voltage for each predetermined period of time, step 3: comparing the difference in voltage with a pre-stored value, step 4: if the difference in voltage is positive, then the portable device (20) is of the dielectric type, but if it is negative, it is of the metallic type, step 5: if the difference in voltage is zero for a predetermined period of time greater than a threshold, then the portable device (20) is in a static approach mode, otherwise it is in a dynamic approach mode.</p> |
