Development and Implementation of an Electro-hydraulic Variable Valve Actuation System to a Homogeneous Charge Compression Ignition Engine
A new type electro-hydraulic variable valve actuation (VVA) system is developed to realize homogeneous charge compression ignition (HCCI) combustion with different exhaust gas recirculation (EGR) strategies on a low speed single cylinder research engine. Power supply pressures and hydraulic piston geometries of the VVA system were firstly determined. Main orifice diameters for fluid charge and discharge were numerically studied with AMEsim software to figure out their optimal values. A damper system and a multi-discharge-orifice mechanism were designed to provide better solutions for actuator braking and for valve seating velocity reduction, respectively. Bench tests indicated that this system was capable to achieve flexible valve motions, such as variable valve timing, duration and lift, with dramatically improved valve lift overshoot and effectively reduced valve seating velocity at the full range of research engine speed. Experiment results revealed that this VVA system could be used to realize robust HCCI combustion by means of different EGR strategies.
variable valve actuation homogeneous charge compression ignition exhaust gas recirculation damper system multi-discharge-orifice mechanism
H Li Y-K Wang Y-H Gu E-W Jiang Y-K Wang X Wang Y-N Guo
State Key Laboratory of Automobile Simulation and Control, Jilin University, Changchun, People’s Rep Engine Design Department, R&D Center, China FAW Group Corporation, Changchun, People’s Republic of C
国内会议
中国内燃机学会燃烧节能净化分会2011年学术年会暨973项目年度工作会议
天津
英文
1-20
2011-08-04（万方平台首次上网日期，不代表论文的发表时间）