Study Of A New Multi-link And VCR Engine By Using Multi-body Dynamic Analysis And Virtual Simulation

In recent years, variable compression ratio(VCR) and variable valve mechanism developed rapidly. The purpose of the development was to be good economical efficiency and dynamic character. This paper studied a multi-link single cylinder engine, and redesigned a VCR mechanism basis on the prototype. The new engine could adjust the compression ratio continuously compared with the prototype. Synchronously we considered a variable valve mechanism that could adjust on-off the valve and lift. During the design, we used virtual simulation technology adequately, provided the reference date that the engine process need, and that saved the cost and time of development.The main research contents of this paper are listed below:(1)Building process of the multi-link and VCR model, emphasizes the characteristic of design and function about some critical components. After that, combining the virtual simulation skill, process the perfect single cylinder model and analysis the kinesiology of piston-link mechanism. At last, we import the curve of cylinder pressure from BOOST, make the analysis of dynamic of the new engine.(2)After modeling, redesign the balance mechanism to reduce the noise and vibration. This passage analyses the inertial force because of the multi-link, designs multiple balance mechanism and in the end we find the best position for balance by optimization method.(3)At last, we do finite element analysis with ANSYS Workbench about critical component (link, pendulum rod, low link etc.), compute the stress-strain, strength and fatigue. Combining the module of ADAMS/autoFLEX, we flex the link and pendulum rod, compare the analysis result.