Analysis and optimization of the engine valve train

Facing the challenge of characteristics improvement, like power output, fuel economy and emissions reduction, the high level of dependability of the valve train is required in order to strengthen the capability of the overall engine system. Furthermore, in response to the existing defects derived from original design of valve train, some major components, especially the cam and valve spring need to be optimized accurately based on the optimizing theory as well as their performances after the simulation. This paper presents the kinematic and dynamic modeling process of a valve train from a gasoline engine using AVL-Tycon platform and analyses the simulation results in comparison with the qualification terms of this practical engine. In addition, an optimization method of the valve train is proposed in accordance with original simulation results.