Brief description of preferred embodiment of the width of the zone of the detection of a vehicle, of a portable case of control a distance of a system of the hands-free access to the said vehicle

摘要

The present invention relates to a process for the uniformity of the width of the detection zone, around a vehicle (v), of a control box of a hands-free access system comprising two lateral antennas (a1, a2) and a rear antenna (a3). According to the invention, it is, for a pair of adjacent antennae (a1 / a3), to the measurements of the magnetic field generated during a transmission of the said neighbouring antennae, and of the magnetic field generated individually for each of these adjacent antennae, so as to divide the coverage area of the said neighbouring antennae are joined by three distinct zones consisting of a running zone, a zone of the rear corner, and a rear running zone, and it selects, on the one hand, for each running zone, a detection threshold of predetermined value selected function of the width of the detection zone, as measured during a transmission of the two neighbouring antennae (a1, a3), and on the other hand, for each zone of the rear corner, a detection threshold small angle with respect to the detection thresholds of the running zones, adapted so that the detection zone of the rear corner has a width equivalent to that of the detection zone of the areas common.