Device for setting beam width for motor vehicle headlamps has switch that produces error signal if potentiometer slider is outside defined zone corresp. to maximum correct range

摘要

The device has an adjustment device (20) with an electric drive motor (28) for a control element (22) for varying the beam width and an actual value potentiometer (37) adjustable by the motor. A controller drives the motor to control the actual signal to a demand signal. The potentiometer has a slider driven at least indirectly by the motor on a resistive track. A switch with a switching element driven by the motor moves approximately in synchronism with the slider and produces an error signal if the slider is outside a defined zone corresp. to the maximum correct range of a adjustment control element