VEHICLE HEADLAMP BEAM CONTROL

摘要

VEHICLE HEADLAMP BEAM CONTROL A control for a motor vehicle headlamp system includes a silicon photovoltaic diode in a short circuit connection across the inputs of an operational amplifier. The diode is disposed behind a lens and baffle to respond only to the light from oncoming vehicles and not to that reflected from roadside objects. The output of the operational amplifier is applied either directly or through an operator adjustable voltage divider to one input of a comparator having a predetermined reference voltage at its other input. The output of the comparator controls the selection of upper or lower beam generators and also switch means to switch in or out the voltage divider so as to provide hysteresis in system operation with the lower-to-upper beam switching level independent of the operator controlled upper-to-lower beam switching level.