ABSTRACT
Being regarded as force or torque amplifier, which reproduces the input to output with various gains, the steering systems are used everywhere for motion control: from cars, trucks, heavy vehicles, and agricultural machines, to airplanes, missiles, navy, submarines, and so on. This chapter presents the structure and the performance of a new electrohydraulic steering system for articulated mobile equipments that are remote controlled. The main conclusion regarding the simulation of a hydraulic power steering is the complexity of the phenomena occurring inside a direction bridge of a car. The simulation model considers that the pump delivers a flow rate proportional to the engine speed and that a three-way flow control valve reduces this flow to a constant one. The steering process quality can be improved by increasing the pressure supply, reducing the length of the hoses, and the servovalve gain around the null. In any case, a preliminary simulation with Amesim is very useful for predicting the system performance.
