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城市快速路速度引导预测控制模型

, PP. 102-107

Keywords: 城市快速路,交通控制,宏观动态交通流模型,速度引导,预测控制模型

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Abstract:

在城市快速路控制系统中,将速度引导作为控制变量,建立了宏观动态交通流模型。以车辆总行程时间与速度引导为目标函数,计算了城市快速路入口区域流量和匝道入口区域流量,建立了快速路速度引导预测控制模型,对速度引导进行优化设计,利用MATLAB软件对下游交通流突变进行仿真分析。分析结果表明通过速度引导控制,交通流平均速度由72.7046km.h-1上升到74.1676km.h-1,交通流平均密度由23.0112veh.km-1下降到21.1567veh.km-1,波动均小于8%;速度方差下降,且最大值仅为420(km.h-1)2;速度引导控制前后的速度方差与密度方差之比分别为3.57、1.91;在交通流突变时段内,速度引导控制前后的速度方差与密度方差之比分别为4.56、2.34。可见,速度引导控制模型有效。

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