| 摘要 |
The invention relates to a drive unit for automatically actuating a tailgate of a motor vehicle. Connecting 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, 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 (à) of the vehicle door ( 1 ) into at least three successive zones (pivot angle ranges) (à 1 -à 4 ), it being possible to determine the individual pivot angle ranges (à 1 -à 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 (à 1 -à 4 ) is then detected with the aid of a second sensor device ( 8 ), which comprises at least one incrementally operating measured value detector.
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