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http://dx.doi.org/10.7467/KSAE.2014.22.6.039

A Study on the Dynamic Behavior of a 2-step Variable Valve Switching System for Automotive Engines  

Kim, Dongil (Graduate School of Mechanical Engineering, University of Ulsan)
Kim, Dojoong (Department of Mechanical Engineering, University of Ulsan)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.22, no.6, 2014 , pp. 39-48 More about this Journal
Abstract
Variable valve actuation system is one of the widely used techniques to improve the fuel efficiency and power of automotive engines. 2-step variable valve actuation systems are also paid attention for the application to direct acting type valve train systems. Besides its advantages in size, weight, relatively simple structure, ets, however, 2-step variable valve actuation system has inherent disadvantages in dynamic instability of switching system to alter discontinuous lift modes. In this study, both experimental and analytical studies are performed to understand the dynamic behavior of a switching mechanism of a 2-step variable valve actuation system, and present a design method to improve its dynamic instability.
Keywords
2-step variable valve; Automotive engine; Latching system; Switching system;
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