Drive system for retractable covering devices for motor vehicles
AssigneeBOS GmbH & Co. KG
InventorsWerner P. Schlecht, Holger Seel, Thomas Laudenbach
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Abstract
A drive system for a covering device, which can be rolled up or folded, for motor vehicles is equipped with a control device. The control device has a current sensor for detecting the current applied to an electric motor of the drive system in the course of moving the covering device. The control system measures a current parameter at the start of the movement of the covering device and switches off the current to the motor as soon as switch-off criteria derived from the current values measured at the start of the movement have been reached.
Claims26
A drive system for a covering device of a motor vehicle, the covering device being movable back and forth between a first end position and a second end position, the drive system comprising:
- an electric motor for controlled movement of the covering device between the first and second end positions;
- a current sensor for detecting current of the electric motor;
- a control device for the electric motor, having a first input for receiving a control signal which causes the control device to put the electric motor into operation to move the covering device from the first end position to the second end position, a second input connected to the current sensor for receiving a current signal, and an output through which the electric motor controlled, the control device being programmed to measure a value of at least one current parameter when the electric motor moves the covering device to leave the first end position, store the measured value of the current parameter as a reference value, continuously compare the reference value with later detected values of the current parameter, and switch the current for the electric motor off when a predetermined relative relationship between a later detected value of the current parameter and the reference value is met.
Dependencies are inferred from the claim text.