DRIVE UNIT FOR AUTOMATICALLY ACTUATING A VEHICLE DOOR

摘要

The invention relates to a drive unit for automatically actuating a vehicle door, in particular the tailgate of a motor vehicle, it being possible to connect the drive unit ( 4 ) to the vehicle door ( 1 ) or to a transmission device ( 6 ) by means of an output shaft ( 5 ), said transmission device executing a pivoting movement which corresponds to the pivoting movement of the vehicle door ( 1 ), and the drive unit ( 4 ) comprising at least one first sensor device ( 7 ) which can be connected to an electronic evaluation device ( 21 ) and serves to detect the respective angular position of the vehicle door ( 1 ). In order to make use of the advantages of an incrementally operating position measurement system of the vehicle door ( 1 ), in which, however, recalibration is necessary not only after the end positions of the vehicle door ( 1 ) are reached following a power cut, the invention proposes dividing the entire pivot angle (alpha) of the vehicle door ( 1 ) into at least three successive zones (pivot angle ranges) (alpha 1 -alpha 4 ), it being possible to determine the individual pivot angle ranges (alpha 1 -alpha 4 ) by means of a first sensor device ( 7 ) which is suitable for detecting absolute values. The pivot angle of the vehicle door within the individual zones (alpha 1 -alpha 4 ) is then detected with the aid of a second sensor device ( 8 ) which comprises at least one incrementally operating measured value detector.