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以90#无铅汽油为基础油,按照50/0、100/0、150/0、200/0(体积分数)的甲基叔丁基醚/汽油混合燃料中的氧含量,配制出相应氧含量的碳酸二甲酯(DMC)/汽油混合燃料,分析研究了不同掺混比例的DMC/汽油混合燃料对电喷汽油机排放特性的影响及三效催化器的净化效率.研究结果表明,在不改变汽油机任何参数的情况下,小负荷时,汽油机燃用DMC/汽油混合燃料,CO和THC排放都有明显改善,尤其当添加比例为1.20/0(体积分数)时,CO和THC排放与基础油相比分别降低约450/0和200/0.然而,在中、高负荷时,随着DMC掺混比的增大,CO和THC排放改善不明显.当添加比例达到4.70/0(体积分数)时,在低速和高速工况下,NOx排放降低约200/0.三效催化器对CO和THC的平均净化效率超过900/0,而对NOx的净化效率相对低一些,仅为300/0.三效催化器的净化效率与DMC的含量和发动机的工作状态有关.
90 # unleaded gasoline as the base oil, according to the oxygen content of 50 / 0,100 / 0,150 / 0,200 / 0 (volume fraction) of methyl tert-butyl ether / gasoline blend fuel to formulate the corresponding oxygen (DMC) / gasoline blend fuel, the effects of DMC / gasoline blend blends with different mixing ratios on the emission characteristics of EFI gasoline engine and the purification efficiency of the three-way catalyst were analyzed.The results show that, When changing any parameter of the gasoline engine, the CO and THC emissions of the gasoline engine using DMC / gasoline blended fuel have a significant improvement at light load, especially when the addition ratio is 1.20 / 0 (volume fraction), the CO and THC emissions and the basis Oil were reduced by about 450/0 and 200/0, respectively.However, at medium and high load, the improvement of CO and THC emission was not obvious with the increase of DMC blending ratio.When the adding ratio reached 4.70 / 0 Fraction), the NOx emission is reduced by about 200/0 at low speed and high speed conditions.The average efficiency of CO and THC purification in the three-way catalyst exceeds 900/0, while the NOx purification efficiency is relatively low, only 300 / 0. Three-way catalytic converter purification efficiency and the content of DMC and the working status of the engine.