以ZS195型直喷式柴油机为原型机，开展了进气道喷射醇醚混合燃料HCCI试验研究，并应用气相色谱和傅里叶红外技术对 HC排放物进行检测，详细分析了 HC排放的主要组成和变化规律。试验研究结果表明：双燃料HCCI试验的指示热效率受负荷和燃料比例影响明显，最高可达到49％，超过原柴油机10％；HC排放明显高于原柴油机，通过精密控制双燃料喷射比例和进气加温措施，能够有效降低 HC排放；二甲醚、甲醇和甲醛是 HC排放最主要的组成部分，其中甲醇在大负荷工况下排放比例会有所增大，甲醛排放受功率的影响较小，在接近爆震边界的时候会出现明显提升。%For ZS195 direct injection diesel engine ,the HCCI experiments of intake methanol/DME injection were carried out , the HC emission was measured with the gas chromatography and Fourier transform infrared technology ,and the main compo-nents and their change of HC pollutants were analyzed in detail .The results show that the indicated thermal efficiency of dual fuel is influenced by the load and mixing ratio .The highest indicated thermal efficiency is 10% higher than that of original en-gine and can reach 49% .HCCI method produces higher HC emission ,but precise control of dual fuel ratio and intake warming can reduce the HC emission effectively .DME (dimethyl ether) ,methanol and formaldehyde are the main composition of HC e-mission .The methanol proportion will increase in high load conditions and the formaldehyde emission which is slightly affected by the power will increase significantly near the knock boundary .
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