共轨柴油机燃烧系统的匹配研究

Matching analysis of diesel engine combustion system with common rail system

在直喷柴油机CA6DE1上安装了高压共轨系统,建立了一套完整的台架试验系统。在试验台上对CA6DE1共轨柴油机进行了性能匹配试验。对喷油器结构参数、燃烧室几何参数和进气涡流比进行了改进和优化。试验结果表明:较高的喷射压力、较小的喷孔直径,匹配较低的进气涡流比和适合的燃烧室形状,同时采取推迟喷油定时的措施;可以改善油气的混合和燃烧过程,减小有害排放,兼顾经济性、动力性和排放性能的要求。

A test bench was set up based on a CA6DE1 Direct Injection （DI） diesel engine equipped with ECD-U2. The experiments on function matching of CA6DE1 diesel engine were conducted. The structural parameters of injector, the structural parameters and swirl ratio of combustion chamber were modified and optimized. Using the high pressure common rail （CR） electronically controlled system and corresponding measurement instruments, the fuel consumption and exhaust parameters were measured. The results show that a higher injection pressure, smaller injector core diameter, a lower swirl ratio, a proper combustion chamber shape and a delay in injection timing, can improve the mixing and combustion of fuel-air mixture, reduce harmful exhaust and improve the overall performance of economy, power and emission.