单活塞液压自由活塞发动机压缩冲程特性  

Compression Stroke Characteristics of Single Piston Hydraulic Free-piston Engine

作　　者：苑士华[1] 吴维[1] 胡纪滨[1] 荆崇波[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《机械工程学报》2010年第18期134-138,共5页Journal of Mechanical Engineering

基　　金：'十一五'国家部委基础科研资助项目(A2220060053)

摘　　要：以压燃式单活塞液压自由活塞发动机为对象研究其压缩冲程特性,以期得到高效可靠的压缩过程实现方案,满足系统着火条件要求。基于系统的基本结构,对系统不同工况下的压缩过程进行分类,并分别研究其主要特征,确定利用液压能实现系统压缩过程的基本控制量。通过建立系统压缩过程气缸状态和液压腔状态仿真模型,结合相关的试验测试结果,对不同工况下的压缩过程特性进行研究。研究表明:系统低压压缩过程着火条件易于满足,在非正常工作状态下的高压压缩过程需要消除压缩蓄能器的稳压作用,同时减小频率控制阀节流作用的影响。To achieve a high efficiency and reliable compression process and satisfy the requirement for compression ignition of a single piston hydraulic free-piston engine,characteristics of the compression stroke are analyzed.The compression process is divided into different categories based on the system configuration.The main characteristics of the categories are presented.The prime control parameters in the compression process realized by hydraulic power are confirmed.A compression model describing the gas cylinder and hydraulic chamber states under different operation conditions is given.The characteristics of the compression stroke under different operation conditions are investigated by combining with simulation and test results.The results indicate that the requirement for compression ignition can be satisfied easily in the low pressure compression process.The pressure stabilizing effect of the compression accumulator should be eliminated and the effect of throttling action of the frequency control valve should be limited in the high pressure compression process in non-normal working state.

关 键 词：自由活塞发动机 柴油机 压缩点火 液压蓄能器 

分 类 号：TH137[机械工程—机械制造及自动化]