基于电控喷油定时与EGR率实现柴油机HCCI/常规燃烧双模式的试验研究  

Diesel Engine HCCI/Conventional Combustion Dual-mode Based on Electronic-controlled Injection Timing and EGR Ratio

作　　者：李德刚[1] 林学东[1] 郭鹏江[2] 李学民 李君[1] 

机构地区：[1]吉林大学汽车动态模拟国家重点实验室,吉林长春130022 [2]大连理工大学内燃机研究所,辽宁大连116023

出　　处：《车用发动机》2009年第4期70-75,79,共7页Vehicle Engine

摘　　要：针对HCCI燃烧在大负荷时的局限性,开发了基于电控燃油喷射定时和EGR率的车用柴油机双燃烧模式,即在小、中负荷工作时,采用均质压燃预混合燃烧,在大负荷时,采用传统的扩散燃烧模式,克服了均质预混合燃烧模式大负荷性能差的缺点。试验研究了在HCCI区域喷油提前角与EGR率对柴油机性能的影响及二者在HCCI区域的协同作用。分析了HCCI燃烧的缸压和放热率。通过油量MAP与喷油定时MAP的优化和爆震扭矩值确定了双燃烧模式工作下的HCCI扭矩范围及过渡区域扭矩线。试验结果表明:采用电控VP37泵与电控废气再循环系统相结合,通过增大喷油提前角的方式,在一定的负荷范围内实现了准HCCI燃烧,NOx与炭烟排放同时降低;在大负荷范围内采用常规燃烧方式,使CA4D32TC柴油机实现了双燃烧模式工作,具有较好的性能指标。Due to the limitation of HCCI at high load, the combustion dual-model of vehicle engine was developed based on electronic-controlled injection timing and EGR ratio. With the dual-mode of HCCI pre-mixed combustion at low and medium load and diffusion combustion at high load, the performance defect of HCCI at high load was avoided. The influences of injection angle and EGR ratio on diesel performance in the region of HCCI were further researched and the cylinder pressure and heat release ratio of HCCI combustion was analyzed. Through the optimization of injection quantity map and injection timing map and the acquisition of knock torque, the torque range and the torque curve of transition region in the combustion dual-mode was determined. The experiment result shows, combining the VP37 electronic-controlled pump with electronic-controlled EGR, the quasi HCCI combustion is realized within the range of certain load by increasing the injection angle, which reduces the NOx and soot emission. Using the conventional combustion mode at high load, the CA4D32TC diesel engine works with the dual-mode and has a better performance.

关 键 词：柴油机 废气再循环 喷油定时 均质压燃 双燃烧模式 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]