摘要
根据实测的催化器入口、出口 HC排放浓度及排气管不同位置的温度 ,结合示功图对电喷汽油机冷起动时 HC排放量在台架上进行了模拟分析 ,将起动过程以节气门突开为界划分为 3个阶段 ,其中HC的主要排放量发生在开始起动到节气门开这一段时间内。通过控制点火提前角使缸内发生不完全燃烧 ,将燃烧延续到排气管内 ,即可降低 HC排放量 ,也有助于加速催化器起燃。
In this paper,a simulation analysis of unburned hydrocarbon emissions from a port injection engine under cold start operating conditions is carried out according to the measured data of HC emissions at inlet and outlet of catalyst,the temperature along the exhaust pipe,and the indicator diagrams of the engine on a test bench.In the investigation,the cold start period is divided into three periods referred to the opening of the throttle valve.Most of the HC are emitted in the first stage,i.e.from cranking to the opening of the throttle valve.Retarding of spark timing can cause incomplete combustion in the cylinder,which leads to the oxidization of the unburned HC in the exhaust manifold,resulting in the reductions of tail pipe Emissions.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2002年第4期292-296,共5页
Transactions of Csice
基金
国家自然科学基金资助项目 (50 0 760 2 1 )
北京市科委项目 (9540 62 4 0 0 )
