In this work, a numerical and experimental study was done to get an optimum cam profile considering dynamic characteristics of the system.
First of all, a four degrees of freedom dynamic model was set up for an OHV type cam-value system. The optimum process was performed with the model into the direction of minimizing the valve acceleration while not modifying original cam shape greatly. Also another optimization which aims to enlarge the valve displacement area while reducing the peak valve acceleration, was tried.
The optimized cam profile was tested experimentally and found that the measured valve displacement, acceleration and the pushrod force show only very small error from the analytically predicted model simulation results. Sometimes the machining error of the cam profile affect critically on the valve motion. The influence of cam machining error into the valve motion was theoretically simulated.