hydraulic Camless Valvetrain Using Variable （使用变量液压Camless气门）.pdf

An Efficient Lift Control Technique in Electro- 2011-01-0940 Published hydraulic Camless Valvetrain Using Variable Speed 04/12/2011 Hydraulic Pump Mohammad Pournazeri University of Waterloo Amir Khajepour Univ of Waterloo Amir Fazeli University of Waterloo Copyright © 2011 SAE International doi: 10.4271/2011-01-0940 ABSTRACT hydraulic valve system prototype and empirical results are then compared with those obtained from the simulations. Significant improvement in fuel consumption, torque delivery and emission could be achieved through flexible control of INTRODUCTION the valve timings, duration and lift. In most existing electro- Although a significant numbers of engine valve-actuation hydraulic variable valve actuation systems, the desired valve systems including cam-based and camless mechanisms have lift within every engine cycle is achieved by accurately been already introduced by several researches and compa