Device for automatically cleaning headlamps of motor vehicles

摘要

By measuring the degree of soiling of the headlamp covers the wipers of these lamps can be activated automatically or a corresponding item of information can be made available to the driver of the vehicle. A sensor mounted in the housing of the headlamp measures the temperature in the headlamp. As a function of the degree of soiling, a portion of the radiation is converted here into heat. In order to be able to compensate the influence of further variables on the temperature in the headlamp, the speed of the vehicle and the external temperature are taken into account in the calculation of the degree of soiling of the headlamp lenses.