Investigation Of Electronic Control System For Air Suspension Based On Fuzzy PID Control

Suspension is one of the important part of vehicle,which has tremendous influence on performance of ride quality and handing stability.Passive suspension is difficult to meet requirements for a car which pursuits under variable environment. Active suspension needs extra force to control it,but this could consume more energy and enhance the weight of vehicle.Semi-active suspension is composed of controllable spring and damper element which consume little energy and are easy to design and manufacture.Because semi-active suspension can improve ride comfort so automobile researchs are enthusiastic are about the research into semi-active suspension.Control strategies,which are the kernel of technology for semi-active suspension control system,greatly influence the suspension performance.In this,a new analytic method that is semi-active suspension Fuzzy PID,is applied to the semi-active suspension control system.And is simulated.In this paper,according to the ride comfort level a quarter car mathematical model of two-DOF has been set up.In the simulation, a mathematical model of road is established,which is the model of integral white noise.After the modeling of input, Fuzzy controller, PID controller and Fuzzy PID are designed respectively and the computer simulations are built with MATLAB individually.According to the simulation results,we find that Fuzzy PID control strategy is reasonable,feasible and scientific.When being compared with Fuzzy control and PID control,severe vibration of the system are depressed considerably in the vicinity of resonant frequencies.