Study On Coordinated Control Of Motion Status Of Automatic Driving Vehicle In Expressway Work Zone

The development of the expressway has promoted the development of China’s national economy and has also greatly improved the travel situation of China’s traffic.The index of traffic capacity is often used to measure the transport capacity of expressways.Once a highway has occurred,it includes construction operations and maintenance.Traffic accidents,etc.,will affect the capacity of expressways,especially during construction maintenance operations,the number of lanes will change,thus forming a bottleneck road segment,the state of the vehicle will also transition from high speed to low speed,frequent deceleration and change the road will It has a certain influence on its capacity and safety.Car networking technology enables information exchange between self-driving cars,while vehicles can receive instructions from the central controller.The use of certain control methods and strategies to reduce the number of vehicles changing lanes is of great significance for vehicles traveling through traffic incident areas with high efficiency and safety.This article takes a one-way two-lane expressway to close the outside lane as the research object,and sets up a coordinated control road section in the expressway work zone.From the time when the vehicle arrives at the end of the coordinated control section,it is automatic driving car that enters the warning section of the expressway work zone.The speed and the vertical distance of the vehicle are adjusted,and a control strategy is proposed.First,in the expressway work zone,this paper describes the section division of the expressway work zone and the functions of each part,and summarizes the driver characteristics and the traffic flow characteristics under the manual driving condition.;The characteristics of the self-driving car and the follow-up process of the self-driving car based on the car-following model theory are analyzed.The lane change process of the car is analyzed from the lane change time and the stage experienced by the lane change,and the construction work is analyzed.The division of the road sections in the district set up the coordinated control section of the expressway work zone.Secondly,the technical conditions of the coordinated control and operation of autonomous vehicles are analyzed from three aspects: vehicle networking technology,automatic driving technology and adaptive cruise control technology.Then,a fleet consolidation model was constructed.Vehicles entered the coordinated control area in the form of a queue,and the constraints of the operation of the self-driving car in the expressway work zone were set.The auto-driving car coordinated control was established based on the time at which the self-driving car arrived at the end of the coordinated control section.The judging conditions,and proposed a coordinated control strategy during the autodriving car movement,to control the speed of the auto-driving car and the distance between the vehicles to control.Finally,the simulation model of the coordinated control of the autonomous vehicle based on the cellular automata is established,and the model is simulated using Matlab software.The traffic flow through the end of the expressway work zone and the length of the coordinated control section of the vehicle during different lane changing times are analyzed.The effect of acceleration.