The Research Of Bus Initiatived Speed Control System

Transportation is the national economic and social development of basic.in recent years,as China's national economic development,social demands in transportation continued to grow,the rapid increase in the number of motor vehicles as well as transport industry.China's death toll in traffic accidents and the death rate per million accident,is first in the world.major accidents can not be effectively controlled, the existence of a large number of road traffic safety problems,especially in the western region in Chongqing,due to the complexity of its terrain,road traffic safety More severe forms.As a result,the issue of road safety research,prevention and reduction of traffic and transportation industry is a major issue,but also the cause of China's transportation is an urgent need for sustainable development.In this paper,first of all according the phenomenon of Chongqing traffic,in order to prevent the occurrence of major accidents,ensure the safety of the people of the trip,bring up a bus initiative speed control system.The system has the following characteristics.(1).Downhill when the bus can be detected through the downhill slope to determine the value of speed,turning a corner by detecting the acceleration of centrifugal force to determine the size of the value of speed,straight through the safe distance to determine the value of the speed limit,so as to achieve the purpose of the initiative to speed.(2).Brake pedal in parallel with the use of the stepper motor drive control technology to reduce speed to protect the system without changes to the original car when the braking system.(3) To study how the state of the road and the bus was traveling on state roads of the vertical and horizontal line,how to control the speed of implementation of the technology.According to the road on how to determine the conditions of the bus line take the initiative to limit the value of the aspects of the completion of the initial hardware and software development.(4).Can take the initiative to report to the police and take the initiative to control the speed of the function,can be followed by the "black box" functionality,tire air pressure detection and alarm functions road debut.Another system uses the ARM chip 32bit real-time operating system withμC/OS-Ⅱ,can achieve real-time operating system used in precision sensors are more than 500MHz,to meet the needs test,the anti-jamming systems,electromagnetic compatibility,anti-vibration performance All through the trial and at the same time the system also has the function of self-study.Through the test car is basically the effect of the speed control from the system can achieve real-time control of the bus.Through this research and production of hardware in order to ensure algorithm theory laid the foundation for the future to carry out deeper research reference.