Investigation of optimal cam profiles by dynamic optimization

Abstract

In this study an investigation to find the optimal profiles for automotive cam systems has been made. The method of dynamic optimization is utilized in this objective. To formulate the problem various factors that affect the profile have been oonsidered, namely the lift, velocity, acceleration and jerk of valve train, stresses in the system, radius of curvature of cam, lubrication between cam and tappet,inlet air quantity and other properties of valve trains. Upon determination of the constraints and the boundary oonditions for the problem the solution outputs are found by numerical method. The solution of the problem by dynamio optimization technique has shown that the optimal curves are, found by polynomial approximations which come out to be a better solution for the protile than any other method. After tabulation and interpretationa of results recommendations are given for further investigations.