Study Of Semi-active Controllers For Vehicle Suspension Based On Mr Damper

With the development of society and technology, the demand on vehicle ride comfort is increasing higher. Stiffness of elastic element and the damping of shock absorbers are designed according to specific working conditions.So deteriorated performance inevitably occur in some conditions. And passive suspension technology is relatively mature, it is difficult to improve ride comfort in a breakthrough. Magnetorheological Semi-active suspension is a broad prospect of the suspension.It can meet a variety of road excitation on the requirements of comfort, but also has good controllability, low energy consumption, continuous adjustable damping force, fast respond and so on.Control strategy and control algorithm are the key points of magnetorheological semi-active suspension technology.The paper studied control strategy and control algorithm.The meaningful work of the paper is: Firstly, the paper deduced the damping force formula of MR damper in mixed mode and built the model of MR damper using MATLAB/Simulink.Secondly,the paper built the dynamic model of whole vehicle based on magnetorheological semi-active suspension. Then the paper built the optical control model and the preview control model and conducted the simulation and analysis under different conditions.Thirdly, the paper built the PID control model of whole vehicle based on magnetorheological semi-active suspension. Taking the parameters of Ford Granada vehicle as input conditions, the paper identified two groups of PID control parameters based on body acceleration and body pitch angular acceleration respectively.Finally, the paper has developed the semi-active vehicle suspension via magnetorheological fluid damper experimental platform. The experiment on the vehicle MRF semi-active suspension's output characteristic, dynamic characteristic, the controlling characteristic, and the experiment on control method for semi-active MRF suspension, under different road input has been done. from the result of the experiment, to study the relativity about the control method for semi-active suspension via MRF damper based on preview and the semi-active suspension dynamic characteristic.