Unit for predicting misting up of screen, especially for vehicles

摘要

The unit has a sensor to determine the surface condition of screen surfaces on the inside. A temperature sensor is arranged near the screen (2) likely to be misted up, but preferably inside (1) a vehicle. An arrangement (4) determines the current inner climate, and has signal outputs for the detected inner temperature (ti) and the relative humidity (Fri). The unit also has a graph storage (5) for the dew point temperature (tTi) of the inner air climates and a comparator, to the input of which are connected signals of the instantaneous temperature on one side and relative air humidity in the inner space of the vehicle on the other side. The comparator output transmits an indicating or a activating signal (S), if the temperature (tS) at the screen, approaches the dew point temperature of the current inner air climate.