A method for operating a rain sensor, in particular for motor vehicles

摘要

A method for operating a rain sensor for detecting the wetting of a disk with moisture to the wetting dependent control of a windshield wiper device– with the use of a transmitter, the transmitter emits light in the disk, and– with the use of a receiver, the detection of light from the disk decoupled,– the from of the disk in the direction of the receiver coupled-out light from a wetting dependent transmitter light fraction (useful light) and an environment light fraction (amount of stray light) is,– wherein with the aid of the light detected by the receiver a rain signal is generated and a control of the windshield wiper device takes place when the rain a rain threshold has exceeded or undershot,– with the ambient light is detected, in the event of a change of only of the ambient light, an unwanted triggering of the windshield wiper device to avoid,– wherein to avoid an undesired activation of the windshield wiper device the rain threshold in dependence on the detected ambient light is adapted to,characterized in that– in the case of a time change of the environment light portion above..