A Study on the Extraction Method of Wheel Rotation Signal Characteristic Quantity.

Wheel rotation parameter is one of the key parameters reflecting driving safety. The existing characteristic quantity of wheel rotation signal adopts an extraction method of wheel radial acceleration curve, by which the measurement range of wheel radial acceleration sensor is quite large, with low sensitivity and resolution ratio, which is difficult to express the true status of radial acceleration and extract characteristic quantity of wheel rotation signal accurately. This article proposes a new method to extract characteristic quantity of wheel rotation signal through the curve of tangential acceleration. To acquire the tangential acceleration signal by installing an acceleration unit on the wheel, apply wavelet packet to make wavelet de-noising on the wheel tangential acceleration signal and then extract the characteristic quantity of wheel rotation signal by STFT. The experimental results indicate that the measuring error of wheel frequency under experimental conditions is -0.79%. This new approach can realize the high-precision measurement on the characteristic quantity of wheel rotation signal, and make further efforts to monitor and evaluate wheel brake performance.