西安市区路网结构对汽车运行模式影响

Effects of road network structure on car's running mode in Xi'an

选取城墙围绕、路网方正布局特征的西安为研究对象,通过道路试验,获取汽车的运行状态数据和燃料消耗数据;借助统计方法,对汽车行驶特征参数、运行模式与燃料消耗的关系进行分析,并与国内、外典型城市行驶模式进行对比。分析结果表明:西安市区各等级路段上车辆的怠速、加速、减速及匀速工况比例接近,且汽车的平均速度和行驶速度均低于25km/h,不利于城市交通节能减排目标的实现;同时,在城墙和城门处易形成明显的交通"瓶颈",使得汽车燃料消耗和污染物排放较高。

Selected Xi ＇an,which typically featured as central axis symmetry, stretchable latex planning structure and surrounded by walls with founder road network as the re- search object,road test was designed and conducted in order to acquire the car＇s actual running data and fuel consumption data.By means of statistical method, car＇s characteristic parameters, running mode and fuel consumption feature were analyzed and com- pared with the domestic and foreign typical urban driving cycle.The results show that in Xi＇an urban roads,the proportion of vehicle＇s idle,acceleration, deceleration and constant speed conditions in running period are all close while car＇s average speed and run- ning speed are both lower than 25 km/h.At the same time,traffic ＂bottlenecks＂ are easy to form in the walls and gates where the proportion of the low speed range and idle condition is bigger,which would lead to higher fuel consumption and pollutant emission.