高速公路交通流密度控制器设计

高速公路宏观控制方法的目的在于防止交通拥塞，至少避免由于交通的多相性引起拥塞状况的恶化，通过寻求控制策略达到理想的交通密度轮廓，然而，由于交通模型的强耦合性和非线性，高速公路密度控制方法研究进展较慢。本利用非线性积分器的backstepping方法，分析和设计控制方案，提出了一种针对自动化公路系统（AHS）的道路交通控制器，这种控制器在宏观水平上操纵，能够使拥塞的高速公路交通密度快速收敛到期望值κai(n）。

Design of Traffic Density Controller for Chinese Expressway

Serious congestion on Chinese expressway make it urgent to control traffic density. The methods of density control suggested by Chien et al and Sanwal et al lack feedback control which we deem to be quite necessary. In section 1, we modify existing models and then derive eq.(4) as the macroscopic dynamic model for our design. In section 2, we use the method of nonlinear integrator backstepping to design traffic density controller for Chinese expressway. We expect our controller to make the traffic density converge very rapidly to the desired value, thus reducing traffic congestion and ensuring that traffic flow is smooth and unhindered. In section 4, simulation results are summarized in Table 1 and Figs.2 through 5; if traffic flow at an access point to a 4 lane expressway is in the range of 1 650~1 950 vehicles /hour, our controller can make adjustments to make traffic density quickly converge to the desired value of 21 vehicles/km/lane for all sections of the expressway near that access point.