Diagnosis of Automobile Engine by Wavelet Analysis (lst Report, Estimation of Valve Clearance)

摘要

In this paper, we attend to propose the new method based on the Wavelet analysis to estimate the clearance between the cam and the valve spring in the automobile engine. At first, we measure the acceleration of the engine valve and the sound emitted from the engine to check the dynamic characteristics of the engine valve. Next, the new data processing technique based on the Wavelet anlysis is applied to estimate the deviation of the valve clearance from the desired value. Finally, our experimental results show the proposed technique can evaluate the excess of the valve clearance quantitatively.