Kinematic synthesis using fireflyalgorithm and computer-aided analysis of continuous variable valve lift mechanism

In this thesis, a variable valve lift mechanism is proposed and then the kinematic synthesis has been performed using both MATLAB and Autodesk INVENTOR. Moreover, optimization of the lengths of the links has been done using the firefly algorithm in order to reduce the error between the objective valve lift profile, a polynomial cam profile of race engine, and the calculated profile. The optimized mechanism is simulated again with both MATLAB and INVENTOR and the family of valve lifts for various maximum valve opening are compared and show a good consistency. The valve velocity and acceleration are also calculated and compared with the objective functions. Thus, this mechanically based idea of the schematic variable valve lift system can be translated in the future into the design of a physical system with a selected actuation system to provide the best valve lift depending on the engine demand.