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根据时变的OD预测信息，基于分层递阶的思想，建立了一个新颖的高速公路优化控制系统。控制结构分为三层：网络负荷分配层对长时期内总的交通需求进行预测，提前确定将来排队长度的上界；全局最优控制层预测未来的交通状态，为路网中的各个匝道建立协调约束；局部反馈控制层根据实测的交通条件及全局最优控制层的寻优结果决定匝道调节率。仿真结果表明，控制系统具有良好的动态性能，协调了各个匝道之间的利益，实现了高速路网整体性能的优化。

A Design with Simulation of Optimal Control System on Freeway Based on OD Prediction

According to the information of real-time OD prediction, a novel hierarchical optimal control system on freeway is proposed based on the hierarchy idea. There are three control layers in this control architecture:First, network load assignment layer predicts in advance the total traffic demands in a long time, and makes the upper bound of the future queue length.Secondly, the area-wide optimal control layer predicts the future traffic state and builds the harmonious restrictions for each ramp.Thirdly, the local feedback control layer adjusts model parameters according to the real-time traffic conditions and the results optimized by the area-wide optimal control layer. The simulation results show that the control system is of good dynamic performance. It harmonizes the benefits of every ramp and optimizes the whole performance of the freeway network.