Research On Anti-rollover Control Strategy Based On Driver Characteristics

Although the car rollover accident has a low share in the entire safety accident,the loss of life and property caused by it is very serious.Therefore,the research on rollover stability has always been the focus of automotive dynamics research.In the man-vehicle-road defense rollover closed-loop system,in addition to the rollover stability control of the vehicle itself,the interaction between the driver’s handling characteristics and vehicle stability also needs to be explored.Therefore,this paper considers the maneuvering characteristics of different types of drivers and conducts research on the anti-rollover control strategy of the closed-loop system of people-vehicles.The main research contents of this article are as follows:Firstly,the vehicle’s multi-degree-of-freedom model,active steering model,brake model,and tire model are established,and the multi-degree-of-freedom rollover dynamic model established is verified.Further based on the traditional lateral load transfer rate,considering the unsprung mass of the entire vehicle,based on the derivative iterative theory,an anti-rollover early warning evaluation index predicted in the future is proposed.Secondly,the influence of different driver parameters on the dynamic behavior of the vehicle is analyzed through a hardware-in-the-loop test platform,and the experimental data of steering manipulation of different drivers under double lane change conditions is collected.Drivers with different steering styles were classified by K-means clustering algorithm.The driver model considering the stability of vehicle rollover is established and the parameters related to rollover dynamics in different types of driver models are identified by differential evolutionary algorithm.Finally,based on active steering and active braking system,the vehicle anti-rollover cooperative control strategy considering driver characteristics is designed,which is divided into two layers: the upper supervisory decision-making layer and the lower cooperative executive layer.The supervisory decision-making control layer sets different rollover constraint boundaries for different types of drivers,and formulates six control decision-making modes based on driver input and vehicle path tracking errors.The lower layer of the cooperative execution control layer is mainly aimed at different types of drivers.On the one hand,the front wheel angle is restrained by the active steering system to reduce the yaw angular velocity and roll risk,and on the other hand,the braking force of four tires is allocated reasonably by the active braking system to prevent roll and reduce the path tracking error.The research content of this paper is a further expansion of the existing automobile anti-rollover research,which can provide theoretical basis and technical support for the design and development of the automobile anti-rollover system.