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采用直喷汽油车在底盘测功机上低速瞬态工况行驶,测量颗粒浓度随着车速变化的趋势,发现直喷汽油车颗粒数量浓度排放在起步阶段达到峰值,热车后颗粒浓度呈指数下降,且热车后颗粒排放随工况变化不是很敏感。
The direct-injection gasoline vehicle was driven on chassis dynamometer at low speed and transient state. The particle concentration was measured with the trend of vehicle speed. It was found that the particle number concentration of direct injection gasoline engine peaked at the initial stage and exponentially decreased , And the hot car pellet emissions change with the conditions is not very sensitive.