Optimization of Polynomial Cam Follower Profile of Direct Injection Diesel Engine
This research paper explored the kinematics of cam and tappet of diesel engine working under acute loads in dynamic conditions to smoothly operate the valve gear train leading to enhancement of engine efficiency. The displacement, velocity, acceleration and jerk values have been deduced considering different profiles of cam. The profile of cam-follower was generated through the five-order and six-order polynomial equations giving due consideration to the various parameters for the befitting design of camshafts. MATLAB software is used as optimization tool to draw the profile of various parameters to reduce vibrations due to jerk. After applying optimization procedure, it was found that six-order polynomial cam is having better performance over five-order cam with continuous jerk to avoid camshaft vibrations. So far major research has been done on cycloidal and harmonic profiles of cam. Polynomial cams provide better solution to internal combustion engines. This analysis would sure be helpful in designing more efficient cam-follower mechanisms so that thermal efficiency can be improved with low level of exhaust emissions.