Open AccessOptimal three-loop cascade PI-P-PI controller for electro-hydraulic power steering system
Author(s) -
Jordan Kralev,
Alexander Mitov,
Tsonyo Slavov,
Ilcho Angelov
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/664/1/012011
Subject(s) - control theory (sociology) , pid controller , cascade , inner loop , trajectory , control system , loop (graph theory) , matlab , signal (programming language) , controller (irrigation) , position (finance) , control engineering , computer science , engineering , mathematics , temperature control , control (management) , physics , artificial intelligence , biology , operating system , agronomy , programming language , combinatorics , chemical engineering , astronomy , electrical engineering , finance , economics
The present paper presents an optimally tuned proportional integral differential (PID) system which calculates the driving signal for the switching valves in order to achieve steering trajectory tracking. The designed cascade control algorithm consists of three PID controllers respectively for the spool valve position, for the effective flow rate and for the steering cylinder position. The stages of the cascade control algorithm synthesis are presented. The goals of control algorithm are to achieve fast transients with minimal overshot and steady state error. Controllers’ are tuned consequently by starting from the innermost loop based on an identified single-input multiple output (SIMO) model of the steering system by optimization algorithm with a quadratic cost. After one of the controllers is successfully tuned the model of the corresponding closed loop system is approximated and employed in the optimization procedure for the next control loop from the cascade system. The developed control algorithm is programmed into a specialized vehicle microcontroller and tested on a steering system test bench in the laboratory.