끝단지지 로커암형 2단 가변밸브 기구에서기계식 밸브간극 조정장치의 적용성에 관한 연구 (Feasibility Study of a Mechanical Lash Adjuster in an End Pivot Rocker Arm Type 2-Step Variable Valve Actuation System)

서지정보

· 발행기관 : 한국자동차공학회
· 수록지 정보 : 한국자동차공학회 논문집 / 25권 / 4호 / 457 ~ 466페이지
· 저자명 : 추병재, 김도중, 최명식

초록

This paper is introducing a two-step variable valve actuation(VVA) system that adopts a mechanical lash adjuster(MLA), instead of a conventional hydraulic lash adjuster(HLA). To minimize the variation of the valve lash in the assembly process, it is necessary to measure the height of the MLA pivots and the valve tips, and to compensate for the valve lash variation with cap shims of appropriate thickness. In this study, the heights of the MLA pivots and valve tips were measured by using a three-dimensional scanning method, and an algorithm was also developed to compensate for the valve lash variation. A number of tests proved that the magnitude of the valve lash could be controlled with the proposed algorithm. A single cylinder, two-step VVA system with an MLA was installed in a motor-rig test bench, and valve motions were measured by using a laser displacement sensor. When the valve lash was properly compensated, there was no serious dynamic malfunction up to the speed of 5000 engine RPM.

영어초록

This paper is introducing a two-step variable valve actuation(VVA) system that adopts a mechanical lash adjuster(MLA), instead of a conventional hydraulic lash adjuster(HLA). To minimize the variation of the valve lash in the assembly process, it is necessary to measure the height of the MLA pivots and the valve tips, and to compensate for the valve lash variation with cap shims of appropriate thickness. In this study, the heights of the MLA pivots and valve tips were measured by using a three-dimensional scanning method, and an algorithm was also developed to compensate for the valve lash variation. A number of tests proved that the magnitude of the valve lash could be controlled with the proposed algorithm. A single cylinder, two-step VVA system with an MLA was installed in a motor-rig test bench, and valve motions were measured by using a laser displacement sensor. When the valve lash was properly compensated, there was no serious dynamic malfunction up to the speed of 5000 engine RPM.

참고자료

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