SBW Driver Model And Optimization Based On Immune Network

Steer-By-Wire System(SBW System for short)combines intelligent control technology with electronic techniques,eliminates the mechanical connection between the turning wheel and steering wheels,and solves the limitation of traditional steering system.The driver model is also an important part of the SBW system.With the development of the automotive technology,the driver model has become the main objective of the researchers' study.This paper firstly analyzed the performance characteristics and key technologies of the Steer-By-Wire System,and established mathematical model of each component of the SBW,and then established the two-degree-of-freedom vehicle model based on vehicle dynamics.Secondly,based on the theory of preview control,it compensated the steering angle of the steering wheel by using the Ackerman geometric relation and the difference between ideal lateral displacement and the actual displacement of the vehicle,then driver model can be established.The correctness and accuracy of the relevant parameters of the driver model in preview and delay section are the necessary premise for the model to be successfully established.In order to enable the driver model to complete the prospective steering operation accurately,based on the working mechanism of the immune network,this paper utilized Opt-ainet algorithm model to optimize parameters of the driver model.Then the optimization of the driver model and the control of Driver-vehicle-road closed-loop system can be achieved.Finally,it utilized professional automobile dynamics simulation software CarSim to establish vehicle model,and introduced the road information in the SBW driver model based on immune network to conduct simulation experiments by taking advantage of the joint function of CarSim and Matlab / Simulink.It compared the driver model's simulation results of the case on the typical working conditions and the case with the genetic algorithm's optimization,experimental results show that the model in this paper not only improves the stability and maneuverability of the vehicle,but also has ability of tracking without error and anti-hysteresis quality.It can better reflect the dynamic characteristics of the vehicle,which provides effective references for the follow-up further research of driver model,vehicle active safety and the development of intelligent driving.