城市交通感应控制综述

城市交通感应信号控制是一种重要的交通信号控制方法，目前被国内外许多中小城市广泛应用。简略介绍了传统的感应控制方法，重点论述了基于绿时有效利用率的感应控制、基于模糊控制和绿时有效利用率的全感应控制、具有相序优化功能的全感应控制等几种改进的感应控制算法的基本原理、控制过程及线圈安装位置，分析了各种感应控制方法的延时策略。分析了定时信号控制和感应信号控制的优缺点，最后对感应信号控制的进一步研究提出了几点看法。

A General Description of Urban Traffic Inductive-Loop Signal Control

Inductive-loop signal control is used as one of the important methods for traffic control in many cities abroad. First, this paper briefly introduces the traditional inductive-loop control methods, and then shifts its emphasis on discussions about basic principles, control process, loop positioning, and phasing extension strategies of several improved algorithms for inductive-loop control, based on effective green ratio, or a fuzzy control prototype plus effective green ratio, as well as a scenario that features a functionality of phasing optimization. The paper also analyzes the pros and cons of the pre-timed and inductive-loop signal control methods, and finally concludes with several concerns regarding further research on inductive-loop signal control.