配气正时对增压柴油机排气道及排气门积碳影响  

Influence of Valve Timing for Deposit on Exhaust Ports and Valves of Turbocharged Diesel Engine

作　　者：韩占群[1,2] 徐洋 赵国东 刘亚奇[1,2] 

机构地区：[1]长城汽车股份有限公司技术中心,河北保定071000 [2]河北省汽车工程技术研究中心,河北保定071000

出　　处：《内燃机与动力装置》2017年第5期5-8,共4页Internal Combustion Engine & Powerplant

摘　　要：针对增压柴油机排气道及排气门积碳的现象,研究配气正时对燃烧以及积碳产生的影响。过多的缸内残余废气会导致燃烧缓慢,燃烧持续期变长,较大的排气提前角会导致缸内还未完全燃烧的混合物被排出气缸,废气经过长时间的积累,在排气门处与排气道内形成积碳。通过合理设置配气正时,减少缸内残余废气,加速燃烧过程,降低或避免积碳形成。For the deposit phenomenon on exhaust ports and exhaust valves ol turbocharged diesel engines ’ research about influence ol valve timing on combustion and formation ol deposit has been performed. The results show that too much in-cylinder residual gas leads to low combustion speed and longer combustion duration. Along with much earlier EVO,evaporated fuel in the cylinder will have no time to combust completely when being pushed out of the cylinder. After accumulating there will be deposits on exhaust valves and exhaust ports. By setting up suitable valve timing, in- cylinder residual gas can be reduced to reasonable level,leading to much faster combustion process. As a result deposits could be reduced or avoided.

关 键 词：柴油机 气门正时 残余废气 积碳 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]