Vehicle Longitudinal Control Strategy Designed With Considerations Of The Driving Style

With the increase of automobile ownership,traffic accidents have caused a large number of casualties and property losses in the world.That has become a very serious social issue.The development of automotive active safety can play a significant role in traffic safety.Advanced Driver Assistant System is part of the active safety of the vehicle.It can enable the vehicle to autonomously detect dangers and control the vehicle to actively avoid danger.The development of intelligent assisted driving technology plays an important role in reducing traffic accidents and promoting the development of smart driving.This paper mainly studies the Adaptive Cruise Control system and the Emergency Collision Avoidance system,and separates the control modes according to the traditional adaptive cruise and emergency collision avoidance systems,by integrating the two systems together and considering the driver style factors in the system design,the traditional system has been improved.This control strategy has mainly played two roles.First,the control system can be adapted to different driving styles of the crowd,improving the driver's adaptability to the system;second,it reduces the impact of emergency braking and improves driving comfort.First of all,through the questionnaire survey,the driver is divided into three types of radical,moderate and conservative,driving behavior data is collected by driving simulator.The collected data are respectively used in ACC system and the CA system,the system is divided into three styles such as Conservative,Moderate and Radial ACC/CA system.The CA system adds an exponential function based on the desired acceleration of ACC system as a control parameter,achieve a fusion control of the two systems,and setting the maximum braking deceleration and brake speed according to different driver style,this method will reduce the impact of emergency braking and suitable for different drivers.Fuzzy methods are used to identify the driver style online according to the index of inverse time-to-collision(TTCi)and alarm threshold X.At last,the control strategy is verified by Prescan software,and compared with the real driver experiment results.The simulation results show that added driver-style fusion control system can improve driver's adaptability and comfort.