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This paper studies the analysis and reduction of hydraulic power steering (PS) noise generated during its static steering operation. By an experimental analysis and a theoretical analysis, we found out that the important factors of PS noise are the bending vibrations of the pump, the pressure hose, the control valve, the power cylinder and the steering column, and the torsional vibrations of the valve and the column, which are generated by pressure pulsations of the pump. Using the theoretical model and the sensitivity analysis, we investigated a stiffness optimization analysis method and achieved the PS noise reduction of approximately 12 dB(A).

This paper deals with a case where H∞ control is applied to a basic control logic of a rack-assisted Electric Power Steering (EPS) system. In the body, the following three key features are described: Construction of the target controlled model including a vehicle Controller design for the model H∞ controller performance verification In this paper, it has been confirmed that H∞ control is valid as a basic control logic for the EPS system.