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Based on the virtual prototype of the vehicle dynamic control mechanical simulation
Abstract
Motor vehicle four-wheel steering is the research and application of new technologies. And two compared to cars, four-wheel steering cars have the following advantages: low-speed turn, the steering radius of small, high flexibility of motor vehicles; high-speed driving, rapid lane changes, and body and will not have a big swing, a decrease of The possibility of facing the end. But at the same time four-wheel steering in the process of shift, it is difficult to guarantee Ackerman theorem, and the low-speed steering, vehicle tail easily encountered obstacles. For this reason, vehicle dynamic stability control (VDC) there, it is not only successfully solved the braking and driving in the car when the direction of stability, but also to solve the car moving in the direction stability. So that all kinds of vehicles in the road condition and have all kinds of good directional stability and control and greatly reduce the occurrence of traffic accidents and injuries.
In this paper, the first system to introduce 4 WS system components, and 4 WS to the process of the study were analyzed 4 WS in high-speed and low speed of the shift, and that its ordinary 2 WS advantage of the differences and, of Some common control programme, designed two non-linear model of freedom, the freedom to respond to the steady-state model and stability and transient response factors were analyzed, and Matlab in response to the opposite angle, yaw rate Response and lateral acceleration response to the simulation, verification of the results of control, come to a large extent, 4 WS system can improve the response to various conclusions.
VDC system is a very complex system, this theory on the vehicle stability control and stability of the basic principles of control strategies, including tire cornering stability of the manipulation of the impact and the steering angle, speed of the vehicle handling and stability Of the impact.
Based on these studies, the paper in the field of automotive simulation of the widely used mechanical system dynamics simulation of common software development platform for MSC.ADAMS, the establishment of a multi-DOF cars multi-body dynamics simulation model. Using MATLAB / Simulink ideal vehicle to establish the linear model and PID control methods such as the yaw angular velocity feedback control model, ADAMS / Control Module, will ADAMS / Car multi-body dynamic model and Simulink control of a joint simulation model. The simulation results, vehicle dynamic control and four-wheel steering integrated control not only to guarantee the stability of high-speed, high-speed flexibility to have been improving, the reduction of high-speed motion to prevent the occurrence of road traffic accidents is of great significance.