Processing of Hydraulic Pressure Sensor Signal Based on Wavelet Analysis

Hydraulic pressure sensor in the automobile is vulnerable to be polluted by the environment of vehicle, the excitation of road and other factors. In this paper, a method based on wavelet analysis is proposed to solve the interference of hydraulic sensor signal. With the wavelet time-frequency analysis, the development trend of the effective signal is identified by wavelet decomposition. Then on the basis of the estimation method, which estimates the noise variance by correlation coefficients, the sensor signal is treated by use of wavelet threshold de-noising. Finally, the available sample value of the signal is constructed by mean filter. In addition, it has been proved by the experiment that the approach, put forward in this paper, is an effective way on the analysis of hydraulic signal and noise elimination.