多缸机液压可变气门运动特性测量试验平台开发及应用  

Development and application of a measurement system for variable hydraulic valve motion in a multicylinder engine

作　　者：金兆辉 张科超 解方喜[1] 张汾滨 JIN Zhaohui;ZHANG Kechao;XIE Fangxi;ZHANG Fenbin(National Key Laboratory of Automotive Chassis Integration and Bionics,College of Automotive Engineering,Jilin University,Changchun 130025,China)

机构地区：[1]吉林大学汽车工程学院汽车底盘集成与仿生全国重点实验室,吉林长春130025

出　　处：《实验技术与管理》2024年第12期142-150,共9页Experimental Technology and Management

基　　金：吉林省教育厅科学技术重大项目(JJKH20241277KJ);2024年度吉林省高等教育教学改革研究课题(2024L5L9F81001C);吉林大学2023年实验技术项目(SYXM2023b035)。

摘　　要：该文研发了四缸机液压可变气门机构,该机构由低压系统、高压系统和落座缓冲机构组成。低压系统为可变气门机构补油,高压系统提供驱动气门开启的压力,并与复位弹簧和落座缓冲机构控制气门开启和关闭。通过AMESim仿真平台对可变气门机构关键零部件进行优化选型,基于可变气门机构搭建液压可变气门运动试验平台,并开展了柔性化可变气门运动特性测量研究。结果表明:气门升程在0~9.5mm连续可变,且气门落座速度小于0.5 m/s,气门关闭时刻可提前约100°CA;在不同发动机循环下,气门最大升程误差和4个缸的气门升程误差均小于0.77%;随着气门开启升程增大或者发动机转速的增加,气门启闭工作模式转换所需的过渡周期增加,最大过渡周期为0.6 s。[Objective]The variable displacement technology(intelligent cylinder deactivation technology)can stop part of the cylinder under partial load,reduce pumping and heat losses,and improve the fuel economy and thermal efficiency of the engine.This new technology has gradually become a hot topic in the field of efficient and clean internal combustion engines.The simple and reliable actuator is a key and important prerequisite for the application and testing of variable displacement technology.In this study,the hydraulic variable-valve mechanism of a four-cylinder engine was developed independently,and it lays the foundation for research on variable-displacement valve control strategies.[Methods]The variable valve mechanism designed in this study is mainly composed of low-pressure and high-pressure systems and a seating buffer mechanism.A low-pressure system is used to ensure that the pipeline of the variable valve mechanism is filled with hydraulic oil.The discharge of hydraulic oil in the high-pressure system can be controlled by opening the throttle valve,and the maximum pressure in the mechanism and piston chamber can also be adjusted to achieve continuous variables of valve lift and timing.The valve seating system reduces the flow rate during the valve-closing process and plays a cushioning role.To reduce the development cycle and save costs,the influence of various factors on the test platform under the condition of reducing the number of tests needs to be explored.According to the characteristics and working principle of the variable valve mechanism components,a simulation model of the hydraulic variable valve mechanism of a four-cylinder machine was built using the HCD library of AMESim software.Through the combination of experiments and AMESim simulations,the influence of key parameters,such as valve spring stiffness,valve piston mass,and throttle hole size,on the pressure fluctuation of the system is explored,and effective measures are taken to reduce the pressure fluctuation.These findings lay the foundation

关 键 词：液压可变气门机构 气门运动特性 AMESim 测试系统 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]