Virtual Modeling And Maneuverability Simulation With Closed-Loop Control For Four-Wheel Steering Vehicles

Four-wheel-steering (4WS) technology can improve the maneuverability and stability of an automobile. In this paper,mechanism dynamics visual simulation technology has been used to analyze the characteristics of transient and steady dynamic responses of 4WS automobile. Some theoretical and simulation results are drawn out as follows:this paper summarize some means to solve the problems when we use ADAMS to simulation the 4WS automobile.Presents a new 4WS vehicle control algorithm(Multi-variable stabilization control for four-wheel steering vehicle based on yaw-rate tracking)to improve the vehicle dynamic characteristics in a high speed range. One virtual dynamic models are made in this paper. The model consist of car body, tire and road models,suspension systems,steering system and dynamic parameters. We can control the rear-wheel-steering in ADAMS/View with some 4WS vehicle control algorithm.The dynamic responses of the 4WS automobiles at 60 and 80 are got by simulations of virtual models using ADAMS. The simulations of the tests are based on the national standards.Compare the controllability and stability when the automobile running with the different parameters.Test the transient and steady maneuverability of the 4WS automobile by using the visual prototyping model with the different control algorithm.From the results of the simulations,it is shown that if a nonzero input of the rear steering angle are suitably controlled according to the 4WS control algorithm,the transient responses of 4WS automobiles will be significantly improved, such as the lateral acceleration and its yaw angular velocity. Meanwhile,its steady maneuverability is unchangeable.