技术领域technical field
本发明涉及智能交通技术领域，尤其涉及一种基于分层流计算的区域交通信号控制方法及系统。The invention relates to the technical field of intelligent transportation, in particular to a method and system for controlling regional traffic signals based on stratified flow calculation.
背景技术Background technique
作为缓解城市交通拥堵的重要发展方向之一，区域交通信号控制旨在利用车辆检测器感知区域交通状况的基础上，经过区域交通信号控制算法的一系列计算、分析和决策，最后主要通过联网道路信号机改变信号灯运行，实现对区域交通的干预和控制。自1963年加拿大多伦多市出现了第一套集中协调式感应控制信号系统以来，不断有新的区域交通信号控制系统被提出并应用到实际交通管理与控制中，如英国的TRANSYT、SCOOT系统，澳大利亚的SCATS系统等。As one of the important development directions to alleviate urban traffic congestion, regional traffic signal control aims to use vehicle detectors to perceive regional traffic conditions, and through a series of calculations, analysis and decision-making of regional traffic signal control algorithms, and finally through networked roads The signal machine changes the operation of signal lights to realize the intervention and control of regional traffic. Since the first centralized and coordinated induction control signal system appeared in Toronto, Canada in 1963, new regional traffic signal control systems have been proposed and applied to actual traffic management and control, such as the British TRANSYT and SCOOT systems, Australia SCATS system etc.
区域交通信号控制系统不仅仅只涉及交通信号的控制算法，而且还包括内在的数据通信、处理等诸多环节以及外在丰富的人机交互，例如包括设备监控、远程控制、流量分析等，甚至需要与其它智能交通子系统进行交互，是一个复杂、大型的软件系统。然而，已有的区域交通信号控制系统研究大多只聚焦控制算法本身，忽略了控制系统本身的软件性能以及系统的可扩展性和易维护性。The regional traffic signal control system not only involves traffic signal control algorithms, but also includes many links such as internal data communication and processing, as well as rich external human-computer interaction, such as equipment monitoring, remote control, traffic analysis, etc., and even requires Interacting with other intelligent transportation subsystems is a complex and large software system. However, most of the existing studies on regional traffic signal control systems only focus on the control algorithm itself, ignoring the software performance of the control system itself, as well as the scalability and maintainability of the system.
现有技术中公开了一种“基于流计算的交通信号控制系统搭建方法及控制系统”，见公布号为：CN 104882007 A，公布日为：2015年09月02日的中国发明专利，该发明提供一种基于流计算的交通信号控制系统搭建方法及控制系统，所述方法包括：搭建用于接收、缓存和向分布式流计算系统转发的由数据采集模块发送的交通信号数据的数据接入模块的软件开发环境并设计数据接入模块；搭建用于接收和处理所述交通信号数据的分布式流计算系统的软件环境；设计分布式流计算系统的拓扑；根据所述拓扑生成并向所述分布式流计算系统的各节点提交JAR包。该专利中有：In the prior art, a "flow computing-based traffic signal control system construction method and control system" is disclosed, see the publication number: CN 104882007 A, the publication date is: 2015-09-02 Chinese invention patent, the invention Provide a flow computing-based traffic signal control system building method and control system, the method includes: building data access for receiving, buffering, and forwarding traffic signal data sent by a data acquisition module to a distributed flow computing system The software development environment of the module and the design of the data access module; build the software environment of the distributed flow computing system for receiving and processing the traffic signal data; design the topology of the distributed flow computing system; Each node of the distributed stream computing system submits the JAR package. Among the patents are:
(1)该专利是基于Storm流计算框架来描述如何搭建交通信号控制系统，而本专利不限定采用何种流计算计算框架(也可以自己实现一个流计算框架)；(1) This patent is based on the Storm flow computing framework to describe how to build a traffic signal control system, but this patent does not limit which flow computing computing framework to use (you can also implement a flow computing framework yourself);
(2)该专利采用模块的方式描述系统的组成，而每种模块都声明对应Storm中的Spout或Bolt，系统最后构成Storm中的Topology；本专利采用分层形式进行系统描述，结构更清晰，更容易开发和维护，而且无需特定的技术才能实现，更具通用性，两个专利对系统的分解方式不同，也决定实现方法和路线不同；(2) The patent uses modules to describe the composition of the system, and each module declares that it corresponds to a Spout or Bolt in Storm, and the system finally constitutes a Topology in Storm; this patent uses a hierarchical form to describe the system, and the structure is clearer. It is easier to develop and maintain, and it can be realized without specific technology, and it is more versatile. The two patents have different decomposition methods for the system, and also determine the different implementation methods and routes;
(3)该专利只关注交通信号控制系统的搭建方法，不涉及具体的信号控制方法(即具体如何控制交通信号)；本专利则同时关注搭建方法和控制方法，在控制优化层中有指出具体的三类操作。(3) This patent only focuses on the construction method of the traffic signal control system, and does not involve the specific signal control method (that is, how to control the traffic signal); this patent focuses on both the construction method and the control method, and points out the specific three types of operations.
发明内容Contents of the invention
本发明要解决的技术问题之一，在于提供一种基于分层流计算的区域交通信号控制方法。One of the technical problems to be solved by the present invention is to provide a regional traffic signal control method based on stratified flow calculation.
本发明的问题之一，是这样实现的：一种基于分层流计算的区域交通信号控制方法，包括如下步骤：One of problem of the present invention is realized in this way: a kind of regional traffic signal control method based on layered flow calculation comprises the steps:
步骤1、采用开源流计算框架搭建区域交通信号控制系统的软件架构；Step 1. Use the open source flow computing framework to build the software architecture of the regional traffic signal control system;
步骤2、在流计算框架中实现数据接口层，通过网络从现场的道路信号机、车辆检测器或者第三方系统中获取交通数据；Step 2. Implement the data interface layer in the flow computing framework, and obtain traffic data from on-site road signals, vehicle detectors or third-party systems through the network;
步骤3、在流计算框架中实现数据清洗层，对接收的不同类型的交通数据中的脏数据进行清洗；Step 3. Implement the data cleaning layer in the flow computing framework to clean the dirty data in the received traffic data of different types;
步骤4、在流计算框架中实现状况评估层，根据清洗后的交通数据对不同交通区域的状态进行评估；Step 4. Realize the status evaluation layer in the flow computing framework, and evaluate the status of different traffic areas according to the cleaned traffic data;
步骤5、在流计算框架中实现控制优化层，对交通区域内各种可控交通信号设备的优化方案进行计算；Step 5. Realize the control optimization layer in the flow calculation framework, and calculate the optimization schemes of various controllable traffic signal equipment in the traffic area;
步骤6、在流计算框架中实现控制指令层，将交通区域内各种可控交通信号设备的优化方案转换成对应的设备指令，并通过网络下发给对应的可控交通信号设备进行控制；Step 6. Realize the control instruction layer in the flow computing framework, convert the optimization schemes of various controllable traffic signal devices in the traffic area into corresponding device instructions, and send them to the corresponding controllable traffic signal devices through the network for control;
步骤7、建立各分层之间的数据通道，根据实际数据流，依次连接数据接口层、数据清洗层、状况评估层、控制优化层和控制指令层以实现区域交通信号控制系统的功能，在本地模拟运行，调试完成后打包成JAR文件；Step 7, establish the data channel between each layer, according to the actual data flow, sequentially connect the data interface layer, data cleaning layer, condition evaluation layer, control optimization layer and control instruction layer to realize the function of the regional traffic signal control system, in Run the simulation locally, and package it into a JAR file after debugging;
步骤8、启动服务器，提交打包好的JAR文件给区域交通信号控制系统，提交成功后，区域交通信号控制系统将根据用户设计的流程开始工作。Step 8. Start the server and submit the packaged JAR file to the regional traffic signal control system. After the submission is successful, the regional traffic signal control system will start working according to the flow designed by the user.
进一步地，所述步骤1中开源流计算框架采用的是Storm、Spark Streaming或以Java语言自行开发的流计算平台。Furthermore, the open-source stream computing framework in step 1 uses Storm, Spark Streaming or a stream computing platform developed by itself in the Java language.
进一步地，所述步骤2具体为：Further, the step 2 is specifically:
使用Java编写数据接口层中的数据接口Class A，利用REST API、WebSockets和MQTT数据通讯技术，实现通过网络从现场的道路信号机、车辆检测器或者第三方系统中获取交通数据的功能；从不同类型的数据源获取交通数据，需要对应实现不同的数据接口Class A，每类数据接口Class A根据每类数据源的数量按照多线程设置并发度。Use Java to write the data interface Class A in the data interface layer, and use REST API, WebSockets and MQTT data communication technology to realize the function of obtaining traffic data from on-site road signals, vehicle detectors or third-party systems through the network; from different Different types of data sources need to implement different data interface Class A to obtain traffic data. Each type of data interface Class A sets the concurrency according to the number of each type of data source and multi-thread.
进一步地，所述步骤3具体为：Further, the step 3 is specifically:
使用Java编写数据清洗层中的数据清洗Class B，实现对接收的不同类型的交通数据中的脏数据进行清洗，所述脏数据包括错误数据、冗余数据、丢失数据以及时间点漂移；针对不同类型的交通数据，需要对应实现不同的数据清洗Class B，每类数据清洗ClassB包含复数个清洗步骤，每类数据清洗Class B根据每类交通数据的数量按照多线程设置并发度。Use Java to write the data cleaning Class B in the data cleaning layer to realize the cleaning of dirty data in different types of traffic data received. The dirty data includes error data, redundant data, missing data and time point drift; for different Different types of traffic data need to implement different data cleaning Class B, each type of data cleaning Class B contains multiple cleaning steps, each type of data cleaning Class B according to the amount of each type of traffic data and set the concurrency according to multi-threading.
进一步地，所述步骤4具体为：Further, the step 4 is specifically:
使用Java编写状况评估层中的状况评估Class C，实现根据清洗后的交通数据对不同交通区域的状态进行评估；所述交通区域是人为划分或根据规则自动生成，针对不同的交通区域，需要对应实现不同的状况评估Class C，每类状态评估Class C根据交通区域的数量按照多线程设置并发度。Use Java to write the status evaluation Class C in the status evaluation layer, and realize the evaluation of the status of different traffic areas according to the cleaned traffic data; the traffic areas are artificially divided or automatically generated according to rules, and for different traffic areas, corresponding Realize different status evaluation Class C, and each type of status evaluation Class C sets the concurrency according to the number of traffic areas according to multi-threading.
进一步地，所述步骤5具体为：Further, the step 5 is specifically:
使用Java编写控制优化层中的控制优化Class D，实现对交通区域内各种可控交通信号设备的优化方案进行计算，该优化方案具体归结为四类操作：一是在交叉口利用传统的感应控制算法缩短或延长某一方向的放行时间；二是在交叉口或匝道口，根据下游入口处的交通流检测器判断是否拥堵，来放行或禁止某个方向，从而避免下游拥堵；三是对潮汐车道，利用流量阈值设定切换规则，当某一方向的交通流量超过设定阈值后，潮汐车道向其切换，使该方向可通行车道增多；四是对可变导向车道，利用排队长度阈值设定切换规则，当交叉口某一转向的排队长度超过设定阈值后，可变导向车道向其切换，使该方向可用车道增多；其中，利用阈值设定切换规则对潮汐车道和可变导向车道进行优化控制时，需要设置覆盖所有情形的阈值设定切换规则，避免出现可控交通信号设备无规则可依的情形，而且每次切换都必须保持在设定的时间内，以免频繁切换；针对不同类型的可控交通信号设备，需要对应实现不同的控制优化Class D，每类控制优化Class D根据每类可控交通信号设备的数量按照多线程设置并发度。Use Java to write the control optimization Class D in the control optimization layer to realize the calculation of the optimization scheme of various controllable traffic signal equipment in the traffic area. The control algorithm shortens or prolongs the release time in a certain direction; the second is at the intersection or ramp, according to the traffic flow detector at the downstream entrance to judge whether there is congestion, to release or prohibit a certain direction, so as to avoid downstream congestion; For tidal lanes, use the flow threshold to set the switching rules. When the traffic flow in a certain direction exceeds the set threshold, the tidal lane will switch to it, so that the number of passable lanes in this direction will increase. Fourth, for variable guiding lanes, use the queue length threshold Set switching rules, when the queuing length of a turn at the intersection exceeds the set threshold, the variable steering lane will switch to it, so that the available lanes in this direction will increase; among them, the threshold value is used to set the switching rule for tidal lanes and variable steering lanes. When the lane is optimally controlled, it is necessary to set a threshold setting switching rule covering all situations, so as to avoid the situation that the controllable traffic signal equipment has no rules to follow, and each switching must be kept within the set time to avoid frequent switching; For different types of controllable traffic signal equipment, it is necessary to implement different control optimization Class D. Each type of control optimization Class D sets the concurrency according to the number of each type of controllable traffic signal equipment and multi-threading.
进一步地，所述步骤6具体为：Further, the step 6 is specifically:
使用Java编写控制指令层中的控制指令Class E，将交通区域内各种可控交通信号设备的优化方案转换成对应的设备指令，并采用对应的通讯方式下发给对应的可控交通信号设备进行控制；针对不同类型的可控交通信号设备，需要对应实现不同的控制指令Class E，每类控制指令Class E根据每类可控交通信号设备的数量按照多线程设置并发度。Use Java to write the control instruction Class E in the control instruction layer, convert the optimization scheme of various controllable traffic signal equipment in the traffic area into corresponding equipment instructions, and use the corresponding communication method to issue to the corresponding controllable traffic signal equipment For control; for different types of controllable traffic signal equipment, it is necessary to implement different control instructions Class E, and each type of control instruction Class E sets the concurrency according to the number of each type of controllable traffic signal equipment in accordance with multi-threading.
本发明要解决的技术问题之二，在于提供一种基于分层流计算的区域交通信号控制系统。The second technical problem to be solved by the present invention is to provide a regional traffic signal control system based on stratified flow calculation.
本发明的问题之二，是这样实现的：一种基于分层流计算的区域交通信号控制系统，包括：The second problem of the present invention is achieved in this way: a regional traffic signal control system based on stratified flow calculation, comprising:
数据接口层：负责通过网络从现场的道路信号机、车辆检测器或者第三方系统中获取交通数据；Data interface layer: responsible for obtaining traffic data from on-site road signals, vehicle detectors or third-party systems through the network;
数据清洗层：负责对接收的不同类型的交通数据中的脏数据进行清洗；Data cleaning layer: responsible for cleaning dirty data in different types of traffic data received;
状况评估层：负责根据清洗后的交通数据对不同交通区域的状态进行评估；Condition evaluation layer: responsible for evaluating the status of different traffic areas according to the cleaned traffic data;
控制优化层：负责对交通区域内各种可控交通信号设备的优化方案进行计算；Control optimization layer: responsible for calculating the optimization scheme of various controllable traffic signal equipment in the traffic area;
控制指令层：负责将交通区域内各种可控交通信号设备的优化方案转换成对应的设备指令，并通过网络下发给对应的可控交通信号设备。Control instruction layer: responsible for converting the optimization schemes of various controllable traffic signal equipment in the traffic area into corresponding equipment instructions, and sending them to the corresponding controllable traffic signal equipment through the network.
本发明的优点在于：本发明是在流计算的基础上采用清晰的分层结构保障软件系统具有良好的可维护性，能够针对实际需求动态更新不同的数据处理算法以及信号控制算法，系统具有低延迟、分布式、高容错的优良特性。The advantages of the present invention are: the present invention adopts a clear layered structure on the basis of stream computing to ensure good maintainability of the software system, and can dynamically update different data processing algorithms and signal control algorithms according to actual needs, and the system has low Excellent characteristics of delay, distribution, and high fault tolerance.
附图说明Description of drawings
下面参照附图结合实施例对本发明作进一步的说明。The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.
图1为本发明一种基于分层流计算的区域交通信号控制方法的执行流程图。FIG. 1 is an execution flow chart of a regional traffic signal control method based on stratified flow calculation according to the present invention.
图2为本发明一种基于分层流计算的区域交通信号控制方法的数据控制走向图。Fig. 2 is a data control trend diagram of a regional traffic signal control method based on stratified flow calculation according to the present invention.
具体实施方式Detailed ways
为使得本发明更明显易懂，现以一优选实施例，并配合附图作详细说明如下。In order to make the present invention more comprehensible, a preferred embodiment is now described in detail with accompanying drawings as follows.
区域交通信号控制的基本原理是利用车辆检测器感知区域交通状况的基础上，经过区域交通信号控制算法的一系列计算、分析和决策，最后主要通过联网道路信号机改变信号灯运行，实现对区域交通的干预和控制。The basic principle of regional traffic signal control is based on the use of vehicle detectors to perceive regional traffic conditions, through a series of calculations, analysis and decision-making of regional traffic signal control algorithms, and finally to change the operation of signal lights through networked road signals to achieve regional traffic control. intervention and control.
因此，如图2所示，本发明将区域交通信号控制系统分为数据接口层、数据清洗层、状况评估层、控制优化层以及控制指令层等五个部分，其中：Therefore, as shown in Figure 2, the present invention divides the regional traffic signal control system into five parts such as data interface layer, data cleaning layer, condition evaluation layer, control optimization layer and control instruction layer, wherein:
1)数据接口层：负责通过网络从现场的道路信号机、车辆检测器获取检测到的交通数据，或者与第三方系统(如出租车、公交车监控系统、电子警察、卡口系统等)进行实时交互获取交通数据。1) Data interface layer: responsible for obtaining detected traffic data from on-site road signals and vehicle detectors through the network, or communicating with third-party systems (such as taxis, bus monitoring systems, electronic police, bayonet systems, etc.) Real-time interactive access to traffic data.
2)数据清洗层：负责对接收的不同类型的交通数据中的脏数据进行清洗。实际中，因为工程质量、检测设备故障、检测环境异常、网络故障等原因，往往会存在一定的脏数据，主要包括：错误数据、冗余数据、丢失数据以及时间点漂移。2) Data cleaning layer: responsible for cleaning dirty data in different types of traffic data received. In practice, due to engineering quality, detection equipment failure, abnormal detection environment, network failure and other reasons, there will often be some dirty data, mainly including: wrong data, redundant data, lost data, and time point drift.
3)状况评估层：负责根据清洗后的交通数据对不同交通区域的状态进行评估，既可作为独立的模块评估实际中实施某种交通管理措施的效果，也可作为区域交通控制算法的输入。3) Status evaluation layer: responsible for evaluating the status of different traffic areas based on the cleaned traffic data, which can be used as an independent module to evaluate the effect of implementing certain traffic management measures in practice, and can also be used as an input for regional traffic control algorithms.
4)控制优化层：负责决策交通区域内各种可控交通信号设备(如路口信号控制器：信号灯，监测设备：视频检测、感应线圈、微波检测)的优化方案并进行计算，具体可归结为三类操作：一是在交叉路口或匝道口，放行或禁止某个方向、缩短或延长某一方向的放行时间；二是潮汐车道转换；三是可变导向车道转换。4) Control optimization layer: Responsible for decision-making and calculation of various controllable traffic signal equipment in the traffic area (such as intersection signal controller: signal lights, monitoring equipment: video detection, induction coil, microwave detection) and perform calculations, which can be summarized as Three types of operations: one is to release or prohibit a certain direction, shorten or extend the release time of a certain direction at an intersection or ramp; the other is to change tidal lanes; the third is to change lanes with variable guidance.
5)控制指令层：负责将控制优化层计算出的交通区域内各种可控交通信号设备的优化方案转换为对应的控制指令，然后通过网络发送给对应的交通信号控制设备进行控制。5) Control instruction layer: responsible for converting the optimization schemes of various controllable traffic signal equipment in the traffic area calculated by the control optimization layer into corresponding control instructions, and then sending them to the corresponding traffic signal control equipment through the network for control.
如图1和图2所示，本发明的一种基于分层流计算的区域交通信号控制方法，包括如下步骤：As shown in Figure 1 and Figure 2, a kind of regional traffic signal control method based on layered flow calculation of the present invention comprises the following steps:
步骤1、采用开源流计算框架搭建区域交通信号控制系统的软件架构；Step 1. Use the open source flow computing framework to build the software architecture of the regional traffic signal control system;
目前，市面成熟的开源流计算框架有Storm、Spark Streaming等，可以直接利用，也可以自行开发，如：采用Java语言自行开发流计算平台，本发明中流计算框架采用的是Storm、Spark Streaming或以Java语言自行开发的流计算平台。不失一般性，本发明以采用Java语言自行开发流计算平台为例进行说明。At present, mature open source stream computing frameworks on the market include Storm, Spark Streaming, etc., which can be used directly or developed by themselves. A stream computing platform developed by the Java language. Without loss of generality, the present invention is described by using the Java language as an example to develop a stream computing platform.
步骤2、在流计算框架中实现数据接口层，通过网络从现场的道路信号机、车辆检测器或者第三方系统中获取交通数据；Step 2. Implement the data interface layer in the flow computing framework, and obtain traffic data from on-site road signals, vehicle detectors or third-party systems through the network;
使用Java编写数据接口层中的数据接口Class A，利用REST API、WebSockets和MQTT数据通讯技术，实现通过网络从现场的道路信号机、车辆检测器或者第三方系统中获取数据的功能，属于常规技术实现手段，其中，REST API：REST是REpresentational StateTransfer的缩写，通过该技术可以从任何支持HTTP请求的设备或系统获取数据；WebSockets：是HTML5中最强大的通信功能，它定义了一个全双工通信信道，仅通过Web上的一个Socket即可进行通信；MQTT：Message Queuing Telemetry Transport，即消息队列遥测传输，是IBM开发的一个即时通讯协议，有可能成为物联网的重要组成部分；从不同类型的数据源获取交通数据，需要对应实现不同的数据接口Class A，每类数据接口Class A根据每类数据源的数量按照多线程设置并发度。Use Java to write the data interface Class A in the data interface layer, and use REST API, WebSockets and MQTT data communication technology to realize the function of obtaining data from on-site road signals, vehicle detectors or third-party systems through the network, which is a conventional technology Implementation means, among them, REST API: REST is the abbreviation of REpresentational StateTransfer, through which data can be obtained from any device or system that supports HTTP requests; WebSockets: is the most powerful communication function in HTML5, which defines a full-duplex The communication channel can communicate only through a Socket on the Web; MQTT: Message Queuing Telemetry Transport, that is, message queue telemetry transmission, is an instant messaging protocol developed by IBM, which may become an important part of the Internet of Things; from different types To obtain traffic data from different data sources, different data interface Class A needs to be implemented correspondingly. Each type of data interface Class A sets the concurrency according to the number of each type of data source and multithreading.
步骤3、在流计算框架中实现数据清洗层，对接收的不同类型的交通数据中的脏数据进行清洗；Step 3. Implement the data cleaning layer in the flow computing framework to clean the dirty data in the received traffic data of different types;
使用Java编写数据清洗层中的数据清洗Class B，实现对接收的不同类型的交通数据中的脏数据进行清洗，所述脏数据包括错误数据、冗余数据、丢失数据以及时间点漂移，目前这方面已经有较多可利用的研究成果，例如基于阈值的错误数据识别方法，基于数据融合的冗余数据处理方法，基于回归模型的错误数据修正与补齐方法、基于规则的时间点漂移处理方法等；针对不同类型的交通数据，需要对应实现不同的数据清洗Class B，每类数据清洗Class B包含了复数个清洗步骤，每类数据清洗Class B根据每类交通数据的数量按照多线程设置并发度。Use Java to write the data cleaning Class B in the data cleaning layer to clean the dirty data in different types of traffic data received. The dirty data includes error data, redundant data, missing data, and time point drift. Currently, this There are already many available research results, such as threshold-based error data identification method, data fusion-based redundant data processing method, regression model-based error data correction and completion method, rule-based time point drift processing method etc.; for different types of traffic data, different data cleaning Class B needs to be implemented correspondingly. Each type of data cleaning Class B contains a plurality of cleaning steps. Spend.
步骤4、在流计算框架中实现状况评估层，根据清洗后的交通数据对不同交通区域的状态进行评估；Step 4. Realize the status evaluation layer in the flow computing framework, and evaluate the status of different traffic areas according to the cleaned traffic data;
使用Java编写状况评估层中的状况评估Class C，实现根据清洗后的交通数据对不同交通区域的状态进行评估，具体评估方法可参考国家推荐标准GAT52722016《道路交通信号控制方式第2部分通行状态与控制效益评估指标及方法》；所述交通区域是人为划分或根据规则自动生成，例如，每个交叉路口及其周围1公里范围作为一个评估区域。针对不同的交通区域，需要对应实现不同的状况评估Class C，每类状态评估Class C根据交通区域的数量按照多线程设置并发度。Use Java to write the status evaluation Class C in the status evaluation layer, and realize the evaluation of the status of different traffic areas based on the cleaned traffic data. The specific evaluation method can refer to the national recommended standard GAT52722016 "Road Traffic Signal Control Mode Part 2 Traffic Status and Control Benefit Evaluation Indicators and Methods"; the traffic area is divided artificially or automatically generated according to the rules, for example, each intersection and its surrounding 1-kilometer range is used as an evaluation area. For different traffic areas, different status evaluation Class C needs to be implemented correspondingly. Each type of status evaluation Class C sets the concurrency according to the number of traffic areas and multi-threading.
步骤5、在流计算框架中实现控制优化层，对交通区域内各种可控交通信号设备的优化方案进行计算；Step 5. Realize the control optimization layer in the flow calculation framework, and calculate the optimization schemes of various controllable traffic signal equipment in the traffic area;
使用Java编写控制优化层中的控制优化Class D，实现对交通区域内各种可控交通信号设备的优化方案进行计算，该优化方案具体归结为四类操作：一是在交叉口利用传统的感应控制算法缩短或延长某一方向的放行时间；二是在交叉口或匝道口，根据下游入口处的交通流检测器判断是否拥堵，来放行或禁止某个方向，从而避免下游拥堵；三是对潮汐车道，利用流量阈值设定切换规则，当某一方向的交通流量超过设定阈值后，潮汐车道向其切换，使该方向可通行车道增多；四是对可变导向车道，利用排队长度阈值设定切换规则，当交叉口某一转向的排队长度超过设定阈值后，可变导向车道向其切换，使该方向可用车道增多；其中，利用阈值设定切换规则对潮汐车道和可变导向车道进行优化控制时，需要设置覆盖所有情形的阈值设定切换规则，避免出现可控交通信号设备无规则可依的情形，而且每次切换都必须保持在设定的时间内，以免频繁切换；针对不同类型的可控交通信号设备，需要对应实现不同的控制优化Class D，每类控制优化Class D根据每类可控交通信号设备的数量按照多线程设置并发度。Use Java to write the control optimization Class D in the control optimization layer to realize the calculation of the optimization scheme of various controllable traffic signal equipment in the traffic area. The control algorithm shortens or prolongs the release time in a certain direction; the second is at the intersection or ramp, according to the traffic flow detector at the downstream entrance to judge whether there is congestion, to release or prohibit a certain direction, so as to avoid downstream congestion; For tidal lanes, use the flow threshold to set the switching rules. When the traffic flow in a certain direction exceeds the set threshold, the tidal lane will switch to it, so that the number of passable lanes in this direction will increase. Fourth, for variable guiding lanes, use the queue length threshold Set switching rules, when the queuing length of a turn at the intersection exceeds the set threshold, the variable steering lane will switch to it, so that the available lanes in this direction will increase; among them, the threshold value is used to set the switching rule for tidal lanes and variable steering lanes. When the lane is optimally controlled, it is necessary to set a threshold setting switching rule covering all situations, so as to avoid the situation that the controllable traffic signal equipment has no rules to follow, and each switching must be kept within the set time to avoid frequent switching; For different types of controllable traffic signal equipment, it is necessary to implement different control optimization Class D. Each type of control optimization Class D sets the concurrency according to the number of each type of controllable traffic signal equipment and multi-threading.
步骤6、在流计算框架中实现控制指令层，将交通区域内各种可控交通信号设备的优化方案转换成对应的设备指令，并采用对应的通讯方式(如光纤以太网、4G/5G网等)下发给对应的可控交通信号设备进行控制；Step 6. Realize the control instruction layer in the flow computing framework, convert the optimization schemes of various controllable traffic signal equipment in the traffic area into corresponding equipment instructions, and adopt corresponding communication methods (such as optical fiber Ethernet, 4G/5G network etc.) to the corresponding controllable traffic signal equipment for control;
使用Java编写控制指令层中的控制指令Class E，将交通区域内各种可控信号设备的优化方案转换成对应的设备指令，并通过网络下发给对应的可控交通信号设备进行控制；针对不同类型的可控交通信号设备，需要对应实现不同的控制指令Class E，每类控制指令Class E根据每类交通信号设备的数量按照多线程设置并发度。Use Java to write the control instruction Class E in the control instruction layer, convert the optimization scheme of various controllable signal equipment in the traffic area into corresponding equipment instructions, and send them to the corresponding controllable traffic signal equipment through the network for control; Different types of controllable traffic signal equipment need to implement different control instructions Class E. Each type of control instruction Class E sets the concurrency according to the number of each type of traffic signal equipment according to multi-threading.
步骤7、建立各分层之间的数据通道；Step 7, establishing a data channel between each layer;
在步骤2-6的基础上，根据实际数据流，依次连接各类Class A-Class E以实现区域交通信号控制系统的功能，在本地模拟运行，调试完成后打包成JAR文件。On the basis of steps 2-6, according to the actual data flow, connect various Class A-Class E in order to realize the function of the regional traffic signal control system, simulate the operation locally, and package it into a JAR file after debugging.
步骤8、启动服务器，提交打包好的JAR文件给区域交通信号控制系统；Step 8, start the server, and submit the packaged JAR file to the regional traffic signal control system;
在该步骤中，首先启动服务器的Java环境，然后利用Java命令行脚本提交所打包好的JAR文件，提交过程也是区域交通信号控制系统的上线过程，一旦完成提交(提交成功后)，区域交通信号控制系统将根据用户设计的流程开始工作。In this step, first start the Java environment of the server, then utilize the Java command line script to submit the JAR file that is packaged, and the submission process is also the on-line process of the regional traffic signal control system. Once the submission is completed (after the submission is successful), the regional traffic signal The control system will start working according to the flow designed by the user.
虽然以上描述了本发明的具体实施方式，但是熟悉本技术领域的技术人员应当理解，我们所描述的具体的实施例只是说明性的，而不是用于对本发明的范围的限定，熟悉本领域的技术人员在依照本发明的精神所作的等效的修饰以及变化，都应当涵盖在本发明的权利要求所保护的范围内。Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we have described are only illustrative, rather than used to limit the scope of the present invention. Equivalent modifications and changes made by skilled personnel in accordance with the spirit of the present invention shall fall within the protection scope of the claims of the present invention.
| Application Number | Priority Date | Filing Date | Title |
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| CN201810782946.6ACN109003459B (en) | 2018-07-17 | 2018-07-17 | A method and system for regional traffic signal control based on layered flow calculation |
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| CN201810782946.6ACN109003459B (en) | 2018-07-17 | 2018-07-17 | A method and system for regional traffic signal control based on layered flow calculation |
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