M15对增压直喷汽油机小负荷工况下燃烧和性能的影响

发布时间：2018-09-04 20:10

【摘要】：在一台缸内直喷汽油机上,针对M15(汽油中甲醇添加体积比例为15%)和M0(汽油中甲醇添加体积比例为0,即纯汽油)两种燃料,试验研究了点火提前角、喷油提前角和喷射压力等控制参数的调整对样机在小负荷、低转速下,燃烧、性能及排放的影响规律和影响差异。研究结果表明:相同喷射脉宽及控制参数条件下,M15汽油的最高燃烧压力比M0的低4%,但最高压力点对应的曲轴转角与M0基本相同。相同喷射脉宽下,燃用M15比燃用M0的发动机输出扭矩下降约10%左右,但燃油经济性有所提高,并分别存在一个点火提前角和喷油提前角,使得转矩最大、燃油消耗率最小,此点火提前角为20°CA(BTDC)、喷油提前角为300°CA(BTDC);而喷射压力对转矩和燃油消耗率影响较小。当使用M15燃料后,HC、CO和NO_x排放均比M0有所降低;M15和M0的HC、CO和NO_x排放均随点火提前角减小而减小;随喷油提前角的变化呈现不规律的变化;喷射压力对HC和NO_x排放的影响不很明显,而对CO呈波动状态。
[Abstract]:In a direct injection gasoline engine, the ignition advance angle of M15 (15% volume ratio of methanol to gasoline) and M0 (0% of pure gasoline) were studied. The influence of the control parameters such as injection advance angle and injection pressure on the combustion performance and emission of the prototype under small load and low rotational speed is discussed. The results show that the maximum combustion pressure of M15 gasoline is 4 lower than that of M0 under the same injection pulse width and control parameters, but the crankshaft rotation angle corresponding to the highest pressure point is basically the same as that of M0. Under the same injection pulse width, the output torque of the engine with M15 is about 10% lower than that of the engine fired with M0, but the fuel economy is improved, and there is one ignition advance angle and one injection advance angle respectively, which makes the torque maximum and the fuel consumption rate minimum. The ignition advance angle is 20 掳CA (BTDC), injection advance angle is 300 掳CA (BTDC);, and the injection pressure has little effect on torque and fuel consumption. When M15 fuel was used, the HC,CO and NO_x emissions of M15 and M0 decreased with the decrease of ignition advance angle, but showed irregularity with the change of fuel injection advance angle, and the effect of injection pressure on HC and NO_x emissions was not obvious. On the other hand, the CO showed a fluctuating state.
【作者单位】：吉林大学汽车仿真与控制国家重点实验室;
【基金】：国家自然科学基金(51276080)(51206059)资助
【分类号】：TK411.2

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