高速公路入口匝道控制器设计

Design on freeway on-ramp metering

为了缓解高速公路交通拥堵问题,对强非线性、随机性和不确定性高速公路数学模型进行分析,提出了一种利用模糊PID控制匝道的方法。该方法依据密度偏差及偏差变化实时修正匝道控制参数,调节进入高速公路的车辆数,从而使高速公路的主线车流密度处于理想状态。结果表明,该控制器较具有较好的动态性能,可以使高速公路交通流密度处于期望密度,提高道路使用效率。

On the purpose of alleviating freeway traffic congestion,this paper analyzed the nonlinear,stochastic and uncertain freeway model,and proposed an on-ramp metering method by using fuzzy-PID.According to the density tracking error and error variation,fuzzy controller adjusted the ramp metering rate,which keeps the density of freeway in an ideal state.The result shows that the fuzzy-PID controller has better dynamic performance,and can achieve a desired traffic density on the freeway and improve the efficiency of freeway usage.