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    • Effects of Early Intake Valve Closing Actuation on Intake and Combustion Characteristics on Diesel Engine
    DOI：
    Key Words:IC engine  fully hydraulic variable valve system  early intake valve closing（EIVC）  effective compression ratio  indicated thermal efficiency  Miller cycle
    Author NameAffiliation
    ZHANG Jiong, CHANG Yingjie, XIE Zongfa, LIU Xin, LI Xiaorui, WANG Zhaoyu 1.School of Mechanical Engineering, Shandong University, Jinan 250061, China； 2.Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, Shandong University, Jinan 250061, China； 3.Longkou Zhongyu Thermotech Co., Ltd., Yantai 265700, China 
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    Abstract:A fully variable hydraulic valve actuation using early intake valve closing (EIVC) mode was developed and assembled on a SD2100TA diesel engine to adjust intake mass flow and effective compression ratio in a large speed range. The intake and combustion characteristics of the modified engine were investigated. The experimental results show that, compared with the throttle valve control mode, the pumping loss is reduced substantially and the mean cylinder temperature is decreased in EIVC mode, which is beneficial to low temperature combustion (LTC). With the advance of intake valve closing timing (IVCT), the effective compression ratio is decreased, the cylinder pressure and temperature at the end of compression stroke are lowered, the ignition delay is increased, the start of heat release is delayed, the proportion of premixed combustion is increased, the proportion of diffusion combustion is decreased, and the exhaust temperature is decreased because of the reduction in the heat capacity. A significant reduction in the peak pressure is attained providing that there is little variation in indicated thermal efficiency, with which a larger output power is obtained. The peak pressure is reduced by 26% at 1 650 r/min and IMEP of 0.64 MPa when the IVCT is advanced from 30° to -50° in crank angle after BDC.
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