Design And Development Of Urban Bus Intelligent Bus-Stop Auto-Announce

With the development and progress of science and technology.the popularization of satellite positioning technology and wireless network communication technology in the transportation industry makes travel easier and more convenient.People often take the public transit as the first choice while traveling,and they also put forward higher requirements for public transit.At present,a lot of cities have deployed the bus automatic dispatching system.Whether the system can run normally or not.it has a great relationship with the Bus-stop Auto-announce installed on the bus.The accuracy of the report station of the Bus-stop Auto-announce directly affects the passenger's ride experience.Automatic driving direction identification and speeding auto trigger alarm function of the Bus-stop Auto-announce can make drivers concentrate on driving and drive safely.The Bus-stop Auto-announce is one of the core devices in the automatic dispatching system of public transport.it is responsible for providing basic automatic voice reporting service for passengers.at the same time,it is the terminal equipment of automatic dispatching system for public transport.through the external fuel consumption sensor.regularly collect fuel consumption information of fuel vehicles and report back to the background dispatching system,and the tire pressure information is collected regularly by the external tire pressure sensor and is reported to the background dispatching system,and it through the external passenger flow collector.calculate the passenger flow information of each station and report back to the background dispatching system,and background dispatching system sends messages to remind drivers timely by voice or text.such as road jam,departure,detour,etc.This article analyzes the current research situation at home and abroad.studies the core technology of the Bus-stop Auto-announce,and the software and hardware design of Bus-stop Auto-announce is also carried out.The Bus-stop Auto-announce adopts the hardware platform with AT91SAM9260 as the main control CPU.combined with embedded Linux system.multithreading processing GPS receiving and parsing.GPRS communication.automatic station.human-computer interaction and so on.GPRS communication processing flow.the introduction of state machine method.not only can easily view the state of each step in the process.but aslo through the state switching.can ensure that the GPRS communication can be quickly recovered when abnormal communication.and can support many different modules of different manufacturers.First of all.in the automatic reporting algorithm.this article studies the traditional automatic station reporting algorithm.also summarize and analyze the advantages and disadvantages of the traditional automatic station reporting algorithm.a triangle automatic stop reporting algorithm is proposed.the algorithm compares the distance between the vehicle and the nearest 3 successive points.can quickly identify the direction of the vehicle and automatically report the station.the algorithm has greatly improved the accuracy of reporting on U-shaped lines or reentrant lines.Secondly,in speeding alarm algorithm.according to the characteristics of different speed limits in different regions.sections and time.this article designs an electronic fence with time and speed limits.the electronic fence can be set repeatedly through the background dispatching system,and it can set more than one moreover.the location and time of the electronic fence can be overlapped.the optimal speed limit is automatically filtered through the speeding alarm algorithm.Finally,in this article.test cases are reasonably designed.from unit testing.integration testing to system testing.fully verify that each function is stable and reliable.in addition to routine measurements on conventional lines.the U line and the reentry line are selected for actual measurement.After the actual bus line test.the intelligent station device.GPS positioning speed fast.high accuracy rate of automatic station.GPRS on-line fast.high online rate.through the speed alarm function.effectively restrict the vehicle overspeed behavior.which achieve the original design requirements.