Method and apparatus for adapting the sensitivity of a sensor system for the detection of precipitations during the control of wiping intervals of a screenwiper

摘要

A method and device for adapting the sensitivity of a sensor system for the detection of precipitations during the control of wiping intervals of a screenwiper drive of a motor vehicle as a function of the kinetic energy of striking precipitations. A pressure-sensitive sensor of a sensor system detects striking precipitations, the detections of striking precipitations are converted into electrical output signals, and the output signals are transmitted via a transmission path to an amplifier with an amplification factor for activating a wiper-motor control circuit. The electrical properties of the transmission path are varied as a function of ambient temperature such that the responsiveness of the sensor system is increased with decreasing temperatures, so that a reliable response even to snowflakes of small mass are achieved.