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Fuel-Efficient and Low-Noise Steering Systems in Large and Heavy Vehicles using Variable Displacement Pump Technology

Article of Honda R&D Technical Review Vol.22 No.2

Summary

A variable displacement pump (VDP) is a fuel-efficient and cost-effective technology that has been applied to steering systems in small- and medium-sized vehicles. However, it is a challenge to apply this technology to large and heavy vehicles due to marketability concerns. This study tested VDP technology in a large light truck and strived to achieve a well-balanced and high-performance steering system with regard to noise, fuel economy, and dynamic performance. Steering noise was analyzed in terms of both the source noise characteristics of the VDP and the noise attenuation characteristics of the steering system. Significant noise reduction was achieved by redesigning the VDP in its number of vanes, structure stiffness, internal component clearances, and rotor position with improved flow ripple characteristics; and by optimizing the steering system's attenuation characteristics using a design of hose-tuning cable devices with optimal pulsation transmission loss characteristics. To ensure gains in fuel economy, a new design specification was developed to control the pump's power consumption by limiting the input torque at various pump speeds. Steering dynamic performance and feel were improved by enhancing the pump's design to provide an adequate flow rate under high pressures while maintaining flow rate and torque characteristics under low pressures. As a result of the study, VDP technology was successfully applied to 2011 model year Odyssey.

Reference

(1) Yu, J., E. Hosni, J. Haskell.: Application of Fuel and Cost Efficient Steering Technology - Variable Displacement Pump - to SUV/SUTs, FISITA 2010 World Automotive Congress, International Federation of Automotive Engineering Societies(2010)
(2) Kojima, E.: Development of a Quieter Variable-Displacement Vane Pump for Automotive Hydraulic Power Steering System, International Journal of Fluid Power 4 (2)(2003)
(3) Yu, J., D. Ritchie.: Method for Objectively Evaluating Power Steering Pump Noise and its Correlation with Subjective Vehicle Feeling Judgment, Honda R&D Technical Review Vol.20, No.1, p.148-154(2008)
(4) Yu, J.: Determining Source Fluidborne Noise Characteristics of Automotive Fluid Power Pumps, SAE International, April, no. 2001-01-1612(2001)
(5) Kojima, E., J. Yu, T. Ichiyanagi.: Experimental Determining and Theoretical Predicting of Source Flow Ripple Generated by Fluid Power Piston Pumps, SAE International, September, No. 2000-01-2617(2000)
(6) Yu, J., F. Johnson, F. Iwami, N. Verrecchia.: Experimental Evaluation for Fluidborne Noise Attenuation in Tuning Cables and Hoses of Automotive Power Steering Hydraulic Systems, SAE International, May, No. 1999-01-1777(1999)
(7) Yu, J., E. Kojima.: Wave Propagation in Fluids Contained in Finite-Length Anisotropic Viscoelastic Pipes, Journal of Acoustical Society of America, Vol. 104, p.3227(1998)
(8) Kojima, E., T. Ogawa, J. Yu.: Design Optimization of Resonator Hoses for Automotive Hydraulic Power Steering System, Transactions of the Japan Fluid Power System Society(2002)

Author (organization or company)

Jinghong YU(HONDA R&D AMERICAS, INC.)、Jon HASKELL(HONDA R&D AMERICAS, INC.)

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