POSITION-DETERMINING UNIT WHICH MEASURES IN A CONTACTLESS FASHION AND METHOD FOR THE CONTACTLESS DETERMINATION OF A POSITION OF AN ACTIVATION ELEMENT OF A USER OF A MOTOR VEHICLE

摘要

The invention relates to a position-determining unit (6) which measures in a contactless fashion and to a method for the contactless determination of a position of an activation element of a user of a motor vehicle. Such a position-determining unit (6) comprises a signal transmitter (15; 18) which is designed to generate a radio-frequency transmitter signal with a transmission level and to input it into a user (4) in a capacitive or conductive fashion, a plurality of sensors (7-10) which are spaced apart from one another and which are designed to sense capacitively the transmitter signal which is transmitted via the user (4) and an activation element (5) of the user (4), and an open-loop control and evaluation unit (17) which, by means of the sensor levels which are made available by some of the plurality of sensors (7-10) and which each represent a received transmitter signal strength, determines a position of the activation element (5) of the user (4) in space taking into account the previously known positions of the sensors (7-10), wherein the signal transmitter is coupled to the open-loop control and evaluation unit (17) by means of information technology and is designed to adapt the signal level of the transmitter signal as a function of the control information received by the open-loop control and evaluation unit (17).