Calibration method for rain sensor of vehicle involves calibrating vehicle rain sensor depending on control voltage converted from difference of light output powers of two light sources

摘要

The light output power of one light source whose amplitude of its rectangular frequency is kept constant, is compared with the light output power of the other light source whose amplitude of its rectangular frequency is changed. The difference of the light output power is converted into a control voltage. The calibration of a vehicle rain sensor is performed depending on the control voltage. The method involves performing the sequential control of the light sources based on a rectangular frequency amplitude. The change of the amplitude of the rectangular frequency of at least one light source is defined.