| 摘要 |
A device for detecting an obstacle in the opening range of a movable closure element ( 13 ), more particularly an electrically powered window pane ( 13 ) or sunroof of a motor vehicle ( 10 ), comprises a sensor electrode ( 20 ), a base electrode ( 21 ) spaced away from the sensor electrode ( 20 ), and a control unit ( 40 ) connected to the sensor electrode ( 20 ) and the base electrode ( 21 ). The sensor electrode ( 20 ) and the base electrode ( 21 ) generate an electric field (F) in the opening range of the closure element ( 13 ) and are spaced away at a constant distance from each other in a first operational mode. The control unit ( 40 ) detects in the first operational mode a change in capacitance caused by the presence of an obstacle in the electric field (F) and providing at least one control signal (I<SUB>s</SUB>, I<SUB>p</SUB>) for a drive ( 50 ) powering the closure element ( 13 ). The device is characterized by high reliability in operation and availability. The reason for this is that the control unit ( 40 ) provides in a second operational mode a control signal (I<SUB>s</SUB>) for the drive ( 50 ) powering the closure element ( 13 ) when the sensor electrode ( 20 ) comes into electrical contact with the base electrode ( 21 ).
|
