实时燃料设计的均质充量压缩着火燃烧与排放的试验研究

An Experimental Study to Control Homogeneous Charge Compression Ignition Combustion and Emission Using Real-Time Fuel Design

根据燃料设计的思想,提出了混合燃料比例实时优化的均质充量压缩着火(HCCI)燃烧控制新方法,并在HCCI单缸发动机上进行了HCCI异辛烷/正庚烷实时控制试验.结果表明:混合燃料HCCI着火以及燃烧相位主要取决于正庚烷实际的燃空当量比;异辛烷的加入对爆震当量比界限有所拓展,但HCCI爆震主要与混合燃料总当量比有关;随着辛烷值比例的提高,导致HCCI运行范围变窄,但是实时调控证明相对纯正庚烷,混合燃料的HCCI燃烧最大负荷提高了80%.试验证明了实时优化控制HCCI燃烧和降低排放的可行性.

A new method of fuel design to control HCCI combustion was given, n-heptane/iso-octane was controlled real-time on a single-cylinder HCCI combustion engine. The test result shows that the equivalence ratio of n-heptane in mixture decides the HCCI ignition and controls the combustion phase of HCCI. The addition of iso-octane extends the knocking limit in equivalence ratio somewhat, however the knock occurrence mainly depends on the total concentration of mixture. Although the operation range in equivalence ratio becomes narrow with the increasing of iso-octane, the maximum load is improved 80% by n-heptane/iso-octane controlled real-time in contrast with the HCCI fueled with n-heptane only. It can be deduced that load can be extended fully and emission can be decreased largely by n-heptane/iso-octane controlled real-time in some optimized method.