Design Of Control System For The Eddy Current Brake Based On FPGA

As one of the most important automotive indexes,good brake performance can reduce drivers' labor intensity , improve driving safety,transportation efficiency and promote economic development. For the sake of reduce the main brake apparatus work load, improve the brake efficiency and stability, camions and coaches have to fixed the eddy current brakes, which can share the lots of brake load. Along with the increasing popularization of eddy current brakes, more and more domestic manufacturer devote themselves in developing independent intellectual property right of eddy current brakes.Combined with the FPGA technology, the paper is research on the ratarders controller design.Paper firstly analyzed the vehicle brake dynamics, discuss on the necessary of the use of eddy current brake, introduce the presently retarders structure, work principle and performance.Then explore the implement of eddy current brake system from the aspect of FPGA embedded technology.Eddy current brake system is a closed loop control system,velocity is a key feedback variable and its accuracy do great importance to the system's performance.This paper analyzes the shortcommings of regular velocity measure method,advances Digital Phase-locked Loop approach,with this approach,we can get the real-time velocity precisely for the elocity control based on BP Neural Network PID.In addition to the excitation current,controlled object is related to the car total mass and the gradient of the slope.So there is no simple linear relationship between controlled object and the excitation current and is difficult to set up a accurate mathematical model.This paper advance a control method based on BP Neural Network PID,and implements different tactics.This subject designs both software and hardware based on NiosII processor embedded technology,describes its system's structure and every function in detail.Then take advantage of the C2H the accelerate some function modules, as a result,this method improves the performance greatly,embody FPGA's Superioritywhen developing embedded system.