| The semi –active suspension makes automobile possess good handling stability and ride comfort when it runs along straight line, speeds up, brakes and turns. My automotive control system control two modes of the variable dampers: soft and hard modes. In order to control the damping mode, the control signals from the ECU are applied to four damper actuators. Upon receiving the control signals from the ECU, the solenoid only operates to move an armature which opens and closes. When the damper control valve is open and the damper is operating under low damping force conditions, the associated vehicle experiences a relatively soft ride as a result. When the damper control valve is closed, the damper is operating under high damping force conditions and the associated vehicle experiences a relative firm ride as a result. Based on the prevenient research, a semi-active suspension controller was designed, for the NJ2045 off-road vehicle. The relative software and hardware went into particulars, and were simulated on-line. Hence its feasibility and practicability was proved. Firstly, in this paper, I set up a seven degree of freedom vehicle model to establish the state equation according to moving differential equation. With the state equation, in the time domain, I simulate four main working conditions: driving straight, speeding up, braking and steering to obtain their responses. Then considering the results of simulation and the experience, the two damping values of two-modes variable damper are obtained. Secondly, a damper was produced ,which the damper force can be adjustable by a electromagnetism armature. The soft mode and hard mode can be selected. Thirdly, a valve with six inner-open-hole was designed, and series of experimentation of it was carried out on the test-rig, so eight groups of data were received. It can be used in the further experiment. Fourthly, the experiment result was compared with the former one, in aim of gaining new design method.
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