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Abstract. This paper presents a novel approach for detecting road surface wetness withplanar capacitive sensors on the wheel arch liner of a motor vehicle. Forthis purpose, various design parameters of interdigital electrodes arestudied by means of the finite element method (FEM). A suitable design forthe detection of whirled-up water is proposed, which is manufactured on aflexible printed circuit board (PCB) and investigated in an experimentalstudy. A test bench is built for that purpose, which includes a motorvehicle's front wheel arch liner and can simulate realistic road surfacewetness conditions. Experimental results show the possibility ofdistinguishing between different road wetness conditions and confirm that a static wettingof the wheel arch liner can be detected. Finally, an application-specificsensor system is proposed, which is validated by experiments on a test benchand is integrated into a vehicle. Field test results show the feasibility ofdetecting different road wetness levels and demonstrate the potential of thepresented approach.

A novel approach for road surface wetness detection with planar capacitive sensors