【文章內(nèi)容簡(jiǎn)介】 disease, affecting the the city normal functioning and urban sustainable development, if we do not take early prehensive measures to governance, urban transport will bee the bottleneck affect China39。s economic development and urban functioning.The fundamental way to solve the traffic problems in the city, there are two, the first is to accelerate the planning and construction of road facilities, improve the urban road network system, this method is an extensive development approach. It is true that the road infrastructure development of urban transport material carriers meet the traffic demand, but by the funding of road construction and urban land space constraints, therefore, we are to ensure that each year some funds for road construction, the more important is to take less investment and quick method, the second way to solve the urban traffic problem is the use of advanced science and technology, modern management and control of urban traffic, improve the capacity of existing roads, this method is a connotation enhance traffic management and control is widely recognized benefits significantly less investment.As can be seen from the road traveled by Britain, the United States, Australia and other countries and traditional predictive control method does not seem to the direction of future research, intelligent control may be an effective way to solve the urban traffic control problem, should be in the future focus on the object. Typical urban traffic signal control systemWith the development of puter and automatic control technology, and the constant improvement of traffic flow theory, transportation organizations and optimization theory continuously improve the technical level, the function of traffic control is enhanced more and more advanced means of control, the formation of a number of highlevel the effective urban road traffic control system.Representative countries in the world most widely used and effective traffic control system the TRANSYT systems, SCATS and SCOOT system. Domestic urban traffic signal control system statusThe late start in China in the development and application of traffic signal control system, started in 1973 the development of single point signal control of urban traffic bywire system in “Beijing three Main Street in 1985.As the Plan major national research items mouth, Nanjing assistance of Tongji University has developed a set of the domestic intelligent traffic signal control system, due to various reasons, a number of important functions, such as realtime adaptive timing did not use. Tianjin University (19891991) research and development of urban traffic control system, TICS (Traffic Intelligent Control system) successfully for the first time since learning intelligent principle applied to the traffic signal control system. Jilin University in 2000 2002, under the auspices of Professor Yang Zhaosheng research and development of urban mixed traffic characteristics of adaptive signal control system and its software mixed traffic adaptive signal control system, the system included bicycle traffic flow detection, consider bicycle traffic during signal timing optimization program with practical engineering applications , and achieved good results. Fuzzy logic based urban traffic controlZadeh fuzzy set theory to solve the plex process uncertainty provides a conceptual framework for those people only a rough approximation of the process of modeling and analysis provides a strong conceptual basis, which can decisionmaking within a certain range by artificial experience. Has a very plex characteristics of urban traffic control, while the longterm practice has accumulated a lot of experience in manual control, which is very suitable for the application of fuzzy control method.Fuzzy control has bee one of the intelligent automation control study of the most active and fruitful fields and has attracted the attention of the world39。s scientists. A lot of fuzzy technology products have been applied in industrial and civil. In 1986, for example, the fuzzy controller in Japan already bee a modity. In 1987, based on fuzzy control Sendai subway opened, then, various home appliances fuzzy successively successfully developed and put into the market. The research of significance1, The theoretical significanceIndepth study of the traffic signal control theory, control method of bining fuzzy control and timing control, and programmable controllers used in industrial applications mature, the design ideas achieve regional control reference significance.The implementation of the system to maximize the use of the city existing transportation facilities, improve the utilization of the road network, the effective control of urban traffic conditions, reduce traffic congestion, reduce environmental pollution, improve economic efficiency has important significance。 while our smart ITS research and development of the transportation system is also of great significance.Chapter II of the basic theory of urban traffic signal controlMainly due to the urban road traffic control paper refers to the road intersection signal lights control.This chapter introduces some theoretical knowledge of road traffic control. The basic parameters of the traffic signal controlEasy paper described in this section is a brief introduction to the basic terms of the traffic signal control.Signal cycle: for directing traffic signal always stepbystep cycle change a loop by a finite number of steps. Step and each step within a cycle is known as a signal cycle, represented by C. If a loop n steps, each step by step length tl, t2, ? ? ? , tn, then C=t1+t2++tn ()Phase : traffic control in order to avoid conflict between the Intersection on the traffic flow in all directions, usually using the method of timesharing traffic intersection on a one or a few pieces of traffic flow, that is, in a period of a