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이종훈(J. H. Lee),이연원(Y. W. Lee),김재환(J. H. Kim) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In the technical development of automobiles, environmental effort is risen with air pollution problem. Hydrocarbon (HC), one of dangerous pollutants in automobiles, is generated about 20~35% in total amount by crankcase blowby gas. A PCV valve eliminates this gas using recirculation loop to control it automatically using return spring. The PCV valve is very small component in an automotive engine but it is very important. Although it has very simple operating principle such as the spool is moved by force balance between fluid force and elastic force, designing a PCV valve is difficult for interaction between fluid and solid. In this study, our purpose is to develop a design program for PCV valve and we verify its efficiency. We used both Euler's equation and 4th order Runge-Kutta method to predict spool displacements and flow areas. Comparing with real products, we found that both spool diameter and displacement were predicted well. But, in comparison with flow rate we could found its difference because of the assumption of non viscous flow, that is Euler's equation.