【摘要】 为了降低柴油机的氮氧化物排放,对YC4112ZLQ增压中冷柴油机进行了电控废气再循环(EGR)技术的研究。试验研究了不同EGR率对发动机各个工况下性能和排放的影响规律,据此针对欧洲Ⅱ号标准优选出了各个工况下的最佳EGR率,并对最佳EGR率下的控制参数进行了电控标定。利用标定结果,设计了一套电子控制系统,用于该柴油机的实际运行。试验结果表明,与原机相比,加入EGR以后,在微粒排放略有增加的情况下,NOx排放下降12.9%,使13工况排放全面达到欧洲Ⅱ号标准的要求。更多还原

【Abstract】 For reducing NOx emissions of diesel engines, an electronically controlled EGR system was developed based on a supercharged, intercooled YC4112ZLQ diesel engine. The effects of different EGR rate on the performances and emissions of the engine were researched by engine tests, and the EGR rates of different engine modes were optimized according to the test results for meeting the EURO Ⅱ emission standard, then the control parameters under the optimum EGR rates were calibrated. An electronically controlled EGR system was designed based on the calibration results and used to control the EGR rates in different conditions. The dynamometer tests show that with the help of the EGR control system, the NOx emissions of the engine are reduced by 129% with the particulate emissions increased slightly and the engine total emissions under 13 modes meet the requirements of the EURO Ⅱ emission standard.更多还原