Optimization Design Of ABS Sliding Mode Controller For Vehicles In Forest Area

Automobile anti-lock braking system is becoming more and more important in improving the active safety of automobiles.Today,the car anti-lock braking system has been widely used.In view of the road conditions,it is easy to have problems such as insufficient braking force,long braking distance,brake failure,braking side slip,and deviation in the operation of the vehicle in the forest area.Based on the summary of the existing research content,the computer simulation technology is used to simulate the braking process of the vehicle on the longitudinal road surface of the forest area,and the control algorithm of the ABS system during the braking process of the vehicle is explored.And based on this optimization and improvement.On the basis of reviewing the domestic and foreign literatures,the key technology analysis and implementation methods for the ABS system of the trucks in the forest area were studied.The main research contents are as follows:A mathematical model of the braking system of the working vehicle in the forest area was established,including the vehicle model,the tire model and the brake actuator model.In order to highlight the research focus and weaken the interference of other factors,the vehicle model uses a single-wheel vehicle braking model;the tire model uses a magic formula to simplify the model,and under the premise of simulating different road conditions,the traditional magic formula parameters are greatly improved.The problem of large calculation amount;the brake actuator model consists of three parts:the drive motor model,the transmission mechanism model and the brake model.Aiming at the characteristics of wet and slippery roads in the forest are,a,a sliding mode variable structure control algorithm is proposed.Aiming at the uncertainty of the control system input function limit,an adaptive control method is introduced and an adaptive sliding mode controller is designed.Aiming at the high frequency chattering problem caused by sliding mode control,based on the design of adaptive sliding mode controller,the RBF neural network is introduced and the RBF adaptive sliding mode controller is designed.The overall simulation model of ABS system was built in MATLAB/Simulink toolbox.The comparative simulation experiments were carried out on ABS system with conventional adaptive sliding mode controller and RBF adaptive sliding mode controller.The experimental results show that the RBF adaptive sliding mode controller has better control effect than the adaptive sliding mode controller,which can not only weaken the chattering phenomenon caused by the conventional sliding mode variable structure control,but also improve the response speed of ABS and Lu.It is good enough to adapt to the wet and complex road conditions in the forest area,and verifies the feasibility and effectiveness of the designed model in practical applications.