CAJ | 학술논문

基于高压共轨系统对一台单缸柴油机采用燃油预喷射控制策略时的燃烧特性与排放特性变化规律进行了研究。在保持循环油量不变的前提下，通过控制每循环燃油的喷射次数、预喷油量、预喷与主喷的间隔角，对发动机缸内燃烧压力、放热规律、压力升高率及排放变化规律进行了分析。试验结果表明：当预喷油量小于5 mg/循环时，发动机能够在维持炭烟颗粒不增加的同时降低NO x的排放，同时发动机的压升率也较无预喷工况有所降低；多次喷射燃烧过程对燃油消耗率的影响较小，较无预喷工况略有上升，但通过对预喷角度、预喷油量及间隔角的合理匹配，能够实现对燃油消耗率的进一步优化。
기우고압공궤계통대일태단항시유궤채용연유예분사공제책략시적연소특성여배방특성변화규률진행료연구。재보지순배유량불변적전제하，통과공제매순배연유적분사차수、예분유량、예분여주분적간격각，대발동궤항내연소압력、방열규률、압력승고솔급배방변화규률진행료분석。시험결과표명：당예분유량소우5 mg/순배시，발동궤능구재유지탄연과립불증가적동시강저NO x적배방，동시발동궤적압승솔야교무예분공황유소강저；다차분사연소과정대연유소모솔적영향교소，교무예분공황략유상승，단통과대예분각도、예분유량급간격각적합리필배，능구실현대연유소모솔적진일보우화。
For a single cylinder diesel engine with high-pressure common rail system ,the influence of fuel preinjection on en-gine combustion and emission characteristics was studied .Under the same fuel supply quantity per cycle ,the changes of in-cyl-inder pressure ,heat release ,pressure rise rate and emission were analyzed by controlling the injection times ,preinjection quan-tity and angle between pilot injection and main injection .The results show that the NO x emission decreases and the soot emis-sion still keeps unchanged when the pilot injection quantity is smaller than 5 mg/cyc .After adding the pilot injection ,the pres-sure rise rate also slightly decreases .The combustion process of multi-injection has a little influence on specific fuel consump-tion and the multi-injection leads to its slight increase .The specific fuel consumption can be optimized by configuring the appro-priate pilot injection timing ,pilot injection quantity and injection interval .