Analytical Design And Research On Valve Train Of Automobile Engine

The valve train is an important mechanism of the internal combustion engine,which is directly related to the reliability of the internal combustion engine operation,vibration, noise, and affects the internal combustion engine power and economy andother basic properties. The camshaft profile and valve timing is the main parameter inthe valve train design.In this paper, the kinematics and dynamics models on valve train of465gasolineengine are built up with AVL TYCON. Combined with the evaluation criteria cam andthrough the analysis of the fullness coefficient to the cam, the contact pressure betweencam and tappet, valve jerk, the cam radius of curvature, and the valve spring margincurve, gets the valve’s performance figures of the original engine. According to theseevaluation criteria, the strengths and weaknesses of original valve train’s performance isanalyzed. Using the kinematic and dynamic cam profile design method to optimize andimprove the design of the cam profile of the original valve train. Lastly, using the designmethods of POLYDYNE provided by AVL TYCON to design a set of best cam profileand the original engine valve train performance has been greatly improved, so theengine’s valve cam profile is optimized.Finally, setting up the overall performance of numerical simulation model by AVLBOOST to analyze the engine performance caused by the intake and exhaust advancedor delayed angle of the original valve timing. Mainly from the engine power and torqueto analyze the valve train and propose the optimal method to the valve timing. Throughthe calculation and comparison by AVL BOOST, getting the best valve timing of andmaking the original engine power increased3.249kw, torque increased6.358N M, sothe engine performance has been greatly improved.