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利用GT-power软件建立某1.4 T增压汽油机模型,模拟在不同海拔下发动机外特性的动力性和经济性的变化情况,全负荷下HC,CO,NO_x比排放的变化情况。结果显示:在低速时,随海拔上升,汽油机的平均有效压力下降较大,最大达到42%;燃油消耗率在800~1 800 r/min下降比较明显,最高达10%;全负荷下CO比排放随海拔的上升整体呈下降趋势;全负荷下HC比排放随海拔的升高而升高;NO_x比排放在全负荷时随海拔上升呈现先增加后降低的趋势。
The GT-power software was used to build a 1.4 T supercharged gasoline engine model to simulate the dynamic and economic changes of engine external characteristics at different altitudes and the changes of specific emissions of HC, CO and NO_x at full load. The results show that at low speed, the average effective pressure of gasoline engine decreases greatly with the altitude increasing up to 42%; the fuel consumption rate decreases obviously from 800 to 1800 r / min, up to 10%; under full load, CO ratio The emission decreased with the elevation as a whole. The HC emission increased with the altitude at full load. The NO_x emission increased first and then decreased with the elevation at full load.