Design Of Vehicle Curve Safety Driving Assist Control System

The traffic safety is facing severe challenges with the continuous growth of highway traffic mileage and car ownership. In order to prevent and reduce road accidents, vehicle safety driving assist technology has attracted wide attention, and became a research hotspot and technological frontier in the field of vehicle active safety. As a common line of highway carrier, the curve road is designed more complex compared with the other straight roads. Traffic accidents occur frequently on the curve road because of lane departure, vehicle collision and sideslip and rollover due to overspeed while driving.Vehicle safety driving assist technology has been doing a further study at home and abroad, including technical breakthroughs, as well as research bottlenecks, which is aimed at improving vehicle active safety performance and the whole road safety level. Aimed at the main traffic accident forms on curve road, and based on Design Specification for Highway Alignment in China, vehicle curve safety driving assist control system is designed in the thesis, including vehicle sideslip and rollover control system, and vehicle curve lane changing controller, which has theory significance and application value to solving related traffic problems.Vision-based bend lane detection is made in the thesis, which obtains real-time curvature radius while recognizing the curve boundary and judging curve direction. On this basis, vehicle curve safety driving assist control system is designed and researched. Among them, vehicle sideslip and rollover control system is designed to prevent side collision and rollover, which is including pose controller and moment controller. In this system, calculating the critical safe speed of sideslip and rollover avoidance according to the current curvature radius is the first step, then making comprehensive analysis and judgment about the vehicle’s current safe sate, and realizing safe speed control and bend lane keeping in the case of hidden trouble in safety. Meanwhile, vehicle curve lane changing controller is designed for the sake of frontal collision avoidance. In the design process, the lane changing trajectory suitable for curve road is planned first, and the relation between vehicle kinematics dynamics is built by virtual velocity vector, then the trajectory tracking control method based on double closed loops structure is researched here. Vision-based bend lane detection aiming at an expressway curve road video is realized by using VC platform, and the curvature radius data obtained above are saved. According to the data above, both vehicle sideslip and rollover avoided effectively and safety assist lane changing realized while driving on the current curve road are verificated by Matlab/Simulink software. Meanwhile, the feasibility of vehicle curve safety driving assist control system designed in this thesis is also verificated.