CNG公交车燃气消耗预测的研究

A Study on the Prediction of Gas Consumption of CNG Buses

为评估北京市在用CNG公交车实际运行的燃气消耗水平,利用随车排放测试系统对北京市在用CNG公交车进行抽样排放测试,然后运用碳平衡法根据污染物排放数据计算出这些车辆的瞬时燃气消耗速率,并分析了燃气消耗特征,建立了按速度、加速度和比功率划分的燃气消耗速率库,得到了北京市CNG公交车实际运行的燃气消耗模型。通过验证,由模型计算出的燃气消耗与实际燃气消耗有很好的一致性,误差在10%以内。因此,只须使用GPS获得某类公交车的运行数据,便可运用该模型预测出同类公交车的燃气消耗。

To estimate the practical gas consumption levels of in-use CNG buses in Beijing,the sampling exhaust emissions of in-use CNG buses in practical operation are measured using a portable emissions measurement system.And then based on these emission data,instantaneous gas consumption rates of these buses are calculated with carbon balance method,and the feature of CNG bus gas consumption are analyzed.The gas consumption rate database for these buses is set up according to the classification by speed,acceleration and vehicle specific power（VSP）,and a model for gas consumption of CNG buses in practical operation is created.Verifications show that the gas consumption calculated with the model is in good agreement with the real gas consumptions measured with a discrepancy within 10 %.Thus once the operation data of vehicles in certain category are obtained by using global positioning system,the gas consumption of vehicle in the same category can well be predicted based on the model.