进气门晚关机构与增压系统在中等负荷的优化匹配  

Optimization Match between IVCA and Turbocharged System at Middle Load in Diesel Engines

作　　者：韩志强[1] 战强[1] 吴松林[1] 苏万华[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：《农业机械学报》2013年第3期17-23,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB21001)

摘　　要：以潍柴蓝擎WP12型重型柴油机为研究对象,在各转速中等负荷工况,通过对比进气门晚关机构(IVCA)开闭两种状态对两级增压系统匹配关系的影响,分析其对关键气路参数和燃烧过程的影响。研究表明,随着喷油定时向上止点后推迟,IVCA机构对NOx和碳烟折中排放的降低作用越发明显。同时,使用IVCA机构后,减少了进气流量,降低了柴油机涡前压力,这将有利于改善高涡前压力工况的有效热效率。结合IVCA机构开闭状态对增压系统运行规律的影响,协同控制油路策略和气路状态参数,可实现IVCA机构与增压系统在柴油机中等负荷的优化匹配。A Weichai-WP12 heavy-duty diesel was taken as the research object and the influence on two-stage turbocharged system was researched, according to contrasting the two states of the IVCA which control mode was open or close. It was also analyzed that the effect on combustion process by key gas path parameters of diesel engines under each speed and middle load condition. The results show that the NOx and soot compromise exhaust emission was significantly declined by IVCA when the injection timing was delayed further after top dead center. At the same time, it was found that IVCA could decrease air intake flow and baekpressure, and then it was considered as a useful way to improve the effective thermal efficiency when engines ran under high backpressure condition. The optimization matching process between boost system and IVCA under middle load working condition could come true if the influences of IVCA on operating principle of boost system were found , while the key air path parameters and fuel parameters was collaborated and controlled precisely.

关 键 词：两级增压系统 进气门晚关机构 热效率 匹配 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]