[논문]EXPERIMENTAL INVESTIGATION OF THE VALVETRAIN FRICTION IN ACTUAL ENGINE OPERATION CONDITIONS

Kang, S.; Kauh, S.K.; Ha, K.P.

doi:10.1007/s12239-010-0056-7

EXPERIMENTAL INVESTIGATION OF THE VALVETRAIN FRICTION IN ACTUAL ENGINE OPERATION CONDITIONS

International journal of automotive technology, v.11 no.4, 2010년, pp.455 - 460

Kang, S. (School of Mechanical and Aerospace Engineering, Seoul National University) , Kauh, S.K. (School of Mechanical and Aerospace Engineering, Seoul National University) , Ha, K.P. (Power Train R&D Center, Hyundai Motor Company & Kia Motor Corporation)

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Recently, the demands for improved fuel economy have been continually rising because of environmental protection policies, legislative pressures on emissions and increases in the price of oil. Reducing the friction power loss in a production engine may be regarded as one of the most effective technologies for improving fuel economy because the technology is cost effective and applicable to a great number of vehicles. This paper describes attempts to measure the torque needed to drive a camshaft and to examine the sources of the torque fluctuations in order to analyze the friction in valvetrains. The measurements were performed through a cam sprocket-type torquemeter, which was able to measure the torque of the valvetrain under actual engine operating conditions. In the cam torque measured, the fluctuations were mainly dependent on the primary oscillations caused by cam events and the secondary oscillations caused by the valvetrain natural frequency. The range of the fluctuations became greater at high speed because of the inertial mass. The resulting FMEP (friction mean effective pressure) of the valvetrain decreased, and the effective peak tension increased with an increase in the engine speed.

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참고문헌 (11)

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저자의 다른 논문 :

표제어: PCR

동의어: Packet Collision Rate

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용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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