Method for estimating the water level on a roadway when a tire is running

A method for estimating a water height on a roadway where a tire is running, wherein a mounted set is assembled onto a vehicle and placed in a wheel arch of the vehicle, the method comprising the following steps:

• fixing a sensor onto the vehicle;
• obtaining a frequency signal, which is a signal corresponding to measurements of sound in terms of frequencies thereof, from the sensor corresponding to the running of the vehicle at running speed V on the roadway covered with water;
• isolating a part of the frequency signal, bounded by two frequencies F1 and F2, F1 being lower than F2, which is sensitive to the water height;
• determining an energy vector linked to the part of the frequency signal, such that the energy vector comprises an integral function of a power spectral density over either the part of the frequency signal or a rectified frequency signal, wherein the integral function is an indicator of acoustic energy associated with a frequency band of a sound response;
• and
• obtaining the water height on the roadway using a function taking account of the energy vector and the running speed V of the vehicle, wherein the water height is determined as a bilinear function of parameters for the running speed V and the energy vector associated with the sound response of the vehicle,
• wherein the sensor is a microphone, and
• wherein the frequency signal extends in total beyond 4 kHz.