气口顺序喷射、稀燃、全电控柴油/天然气双燃料发动机的研究

摘要

采用气口顺序喷射、稀燃、全电控柴油／天然气双燃料发动机方案，对斯太尔WD615．64增压非中冷柴油机进行了改装。试验结果表明，改装后的发动机NOx、颗粒和NMHC排放均达到了欧Ⅱ排放指标。CO和HC(含甲烷)可以通过后处理解决。%A brief review of dual fuel engine technology is given in thispaper from the point of view of technology and market in China.A sequencial port injection,lean burn,fully electronically controlled dual fuel engine was proven to be the most suitable solution to the market requirement——clean and economical.It is also a important advantage in China that the engine could operate either on CNG or on 100% diesel fuel when gas supply is interrupted.Optimization of combustion process for the purpose of low emissions and high fuel economy was carefully conducted by calibration of natural compressed gas injection quantity and timing and quantity of diesel fuel injection at all operating condtions.The effects of air／gas ratio λ on NOx,PM,THC and CO were given and analyzed.