| As the limit of its operating principle, the conventional center-opened hydraulic power steering system had a lower energy utilizing rate. In this paper, based on analyzing the conventional center-opened hydraulic power steering system in detail, referring to relational study and data, the present several energy saving schemes of hydraulic power steering system were studied one by one and the energy saving effect of them were compared. These hydraulic power steering system were center-opened hydraulic power steering system with variable displacement pump, center-opened hydraulic power steering system with electromotor(electro-hydraulic power steering), mechanical center-closed hydraulic power steering system, center-closed electro-hydraulic power steering system. Through analyzing and comparing, it can be proved that the electro-hydraulic power steering system will be developed mainly in the future. In the environment of Matlab6.0, using the Simulink blockset, the permanent magnet brushless direct current electromotor was simulated. Based on this, the models of the two kinds of electro-hydraulic power steering system, the center-opened electro-hydraulic power steering system and the center-closed electro-hydraulic power steering system, were built. Using the models, it was studied and compared that the flow characteristic and response characteristic of two kinds of electro-hydraulic power steering system. On the basis of results of simulation, it is pointed that, in the condition of present technology, the center-opened electro-hydraulic power steering system is better than the center-closed electro-hydraulic power steering system and it should be the first scheme for the energy saving of the conventional center-opened hydraulic power steering system.
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