| 摘要 |
<p>The invention relates to vehicle windscreen wiper systems.
<??>It is an object of the invention to provide a windscreen wiper system associated with a rain detector. This detector operates according to the principle of the detection of the absorption by the wet glass panel of rays undergoing multiple total reflections inside the windscreen.
<??>According to the invention, it is proposed to use several non-directional light sources (EA, EB) and several detectors (RA, RB) each receiving the light from the various sources. The sources are modulated at different frequencies (F1, F2) and the detectors are associated with demodulation circuits (DF1A, DF2A, DF1B, DF2B), so that more detailed information is obtained on the nature of reductions in transparency of the windscreen; the windscreen wiper system can then be actuated taking into account this more detailed information.
<IMAGE></p> |
