Abstract: For the construction of driving cycle of Xian bus line, the line intensity was used to select the sampled bus line and a comprehensive stability index of the samples was proposed to judge whether the sampling data were saturated. Based on the method of clustering analysis,the driving cycle of Xian bus line was constructed.The validity of the construction condition was verified by the average error and V-A probability 2-D distribution matrix similarity.The test data indicate that the average error is only 7.3% between the sampling data and the constructed cycle and the similarity coefficient of the V-A probability distribution matrix of both is 0.9957, which shows that the error caused by the clustering method is small and accords with the actual driving condition.

Key words: traffic engineering, city bus, line selection, sampling judgment, cluster analysis, driving circle construction

摘要： 针对西安市城市公交线路工况构建，提出了采用线路强度来筛选采样线路的方法和根据样本综合稳定度指标来判定工况数据采样量饱和的判据， 并基于聚类分析法构建了西安市某城市公交线路工况，通过平均误差和V-A概率二维分布矩阵相似度验证了构建工况的有效性。试验数据表明：采样数据 与构建工况之间平均误差为7.3%，两者的V-A分布概率矩阵的相似系数为0.9957，表明采用聚类法构建得出的工况误差较小，符合实际行驶情况。

关键词: 交通工程, 城市客车, 线路筛选, 采样量判断, 聚类分析, 工况构建