4VVAS可控自燃汽油机燃烧过程的试验研究  

Experimental Study on CAI Gasoline Engine Equipped with 4-Variable Valve Actuating System

作　　者：秦静[1] 谢辉[1] 张岩[1] 陈韬[1] 何邦全[1] 赵华[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《内燃机学报》2007年第4期316-321,共6页Transactions of Csice

基　　金：国家重点基础研究发展规划项目(2001CB209204)

摘　　要：在一台配备进、排气门升程及定时同时可控的四变量气门执行机构(4-Variable Valve Actuating System,4VVAS)的进气道喷射汽油机上通过保留部分热废气的方法,实现了汽油机均质可控压燃(CAI)燃烧。通过试验考察了不同气门升程下的CAI燃烧过程,从而探讨气门参数对废气再压缩汽油机CAI燃烧的控制作用。研究表明,不同气门升程下的发动机运行负荷范围不同,适当减少有效压缩比可以减少爆震倾向,增加低转速下大负荷范围,而通过增加气门升程可以拓展高转速下CAI汽油机大负荷运行范围。发动机负荷大小主要依靠排气门参数来调节,而进气门参数能够控制进气回流和有效压缩比,从而对残余废气率及汽油机CAI燃烧过程具有对称性控制作用。Controlled auto-ignition combustion was achieved using negative valve overlap method to trap enough hot residual gas to heat mixture in a PFI gasoline engine equipped with a 4-variable valve actuating system （4VVAS）. The effects of the valve parameters on the gasoline controlled auto-ignition（CAI） combustion are experimentally investigated. The results show that different load ranges can be achieved using various valve curves. The low-speed-high-load and the high-speed-high-load regions can be extended respectively through late intake valve closing with reduced effective compression ratio and high valve lifts. The exhaust valves mainly control the load, while the intake valve events can alter the effective compression ratio and back flow of intake charge. These consequently make the symmetrical control effect on the residual gas fraction and the CAI combustion process.

关 键 词：四变量气门执行机构 CAI汽油机 气门参数 燃烧过程 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]