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对内蒙古地区高速公路的交通组成、载重车辆功率、载质量、质量功率比进行了统计分析,确定了高速公路上坡路段的主导车型。依据修正的速度预测模型,分别绘制了不同坡度(1%~6%)、坡长、载质量(30、40、50、55t)、质量功率比(80、120、160、200kg·kW-1)、初始入坡速度(0、20、40、60km·h-1)下的主导车型运行速度曲线,并从汽车动力学角度研究了曲线变化的原因。分析结果表明:内蒙古地区运煤高速公路主导车型为福田欧曼ETX9系重卡;载重车辆在一定坡道上行驶,当达到平衡速度之后,速度不再随坡长的增加而降低;坡度越大,速度降低越快,最后达到的平衡速度越小;车辆载质量越大,速度降低越快;质量功率比越小,车辆爬坡性能越好;初始速度越高,车辆达到平衡速度所行驶的距离越长。
Based on the statistical analysis of traffic composition, load power, load mass and mass power ratio of freeway in Inner Mongolia, the dominant model of the uphill section of expressway is determined. According to the revised velocity prediction model, the slope gradient (1% -6%), slope length, load mass (30,40,50,55t), mass power ratio (80,120,160,200kg · kW-1 ) And the initial ramp speed (0, 20, 40, 60 km · h-1). The reasons for the curve changes were also studied from the perspective of vehicle dynamics. The results show that the dominant type of coal-expressway in Inner Mongolia is the Foton Auman ETX9 heavy truck. When the truck runs on a certain slope, the speed will not decrease with the increase of slope length. The larger the slope, The faster the vehicle speed is, the lower the speed of balance is and the lower the balance speed is reached finally. The higher the vehicle load mass is, the faster the speed is reduced. The smaller the mass power ratio is, the better the vehicle climbing performance is. long.