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- 저자 : 장지욱(J. U. Chang) (검색결과 3 건)
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안형준(H.J.Ahn),곽상용(S.Y.Kwak),장지욱(J.U.Chang),한동철(D.C.Han) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Variable valve timing (VVT) and variable valve lifting (VVL) mechanisms were developed to control timing and lifting of air intake and exhaust, which makes engines has increased torque, reduced pumping loss, reduced emission. And etc. As an alternative of VVT and VVL system, electro-mechanical valve (EHV) system has whole flexible controllability of the valve timing and lifting and its ultimate goal is a throttleless engine using the camless valvetrain. The EHV system that usually consists of mechanical springs and two electromagnets (EH) is controlled in open-loop scheme. The EH EHV system is very difficult to control valve lifting and timings although using high control technique because of nonlinear system. Therefore, several complex control schemes such as adaptive feedback control and iterative learning control was used to obtain desired voltage trajectory·. This paper presents a PH/EM hybrid actuator for a feedback EMV/ system. Against the existing EMV using only EM, the proposed actuator has several advantages: energy save, improved linearity, reduction connection, enhance current control performance, improved dynamic characteristics etc. A theoretical model of the proposed actuator is derived, and several non-dimensional analyses are performed to extract design parameters. A test rig fur the new EHV system is built and the performances of the system are verified experimentally.
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