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利用车载尾气检测设备和GPS系统收集了北京市重型柴油公交车实际行驶和排放数据,引入汽车比功率(VSP)参数,建立柴油公交车排放预测方法,并对柴油公交车的实际运行和排放特征进行了分析。行驶特征分析表明,公交车在北京市五环内的平均速度为17.17km/h,其80%以上行驶处于VSP区间[-1,3]kW/t;排放特征分析表明,柴油公交车瞬时高排放集中在VSP≥10kW/t区间,表明高加速或快速行驶是引起瞬时高排放的主要原因。
The actual driving and emission data of heavy-duty diesel buses in Beijing were collected by vehicle exhaust testing equipment and GPS system. The VSP parameters were introduced to establish the forecast method of diesel bus emissions. The actual operation and emission characteristics of diesel buses Analyzed. The analysis of driving characteristics shows that the average speed of buses in the Fifth Ring Road in Beijing is 17.17km / h and over 80% of them are in the VSP interval [-1,3] kW / t. The emission characteristics analysis shows that the instantaneous high speed of diesel buses Emissions concentrated in the VSP ≥ 10kW / t range, indicating that high acceleration or rapid driving is the main cause of transient high emissions.