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An Energy Saving Technique in an Electro-Hydraulic Power Steering (EHPS) System
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English
Abstract
This paper deals with an energy-saving electro-hydraulic power steering (EHPS) system using a center-closed servo valve without an accumulator. During non-steering operation, the pump and motor in this EHPS system operate at an extremely low speed with a low voltage. At neutral position in non-steering condition, the pump delivery flow leaks through the clearances in the hydraulic components, raising the pump pressure because the center-closed servo valve does not pass oil-flow. With a lower delivery flow rate, the pump pressure rises slightly and the motor current is also low, resulting in low electric energy consumption. When the steering wheel is turned, the pump and motor operate at a high speed and supply as much oil as needed to produce sufficient assist force.
This EHPS system was tested on a conventional engine-driven vehicle with a front weight of 720kg and its effectiveness was revealed.
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Citation
Inaguma, Y., Suzuki, K., and Haga, K., "An Energy Saving Technique in an Electro-Hydraulic Power Steering (EHPS) System," SAE Technical Paper 960934, 1996, https://doi.org/10.4271/960934.Also In
References
- Shimzu Y. Kawai T. “Development of Electric Power Steering” SAE paper 910014
- Forbes J. E. Baird S. M. Weisgerber T. W. “Electro- hydraulic Power Steering -An Advanced System for Unique Applications” SAE paper 870574
- Iga S. Sakazaki A. Shibata N. Ohe T. “Motor Driven Power Steering -For the Maximum Steering Sensation in Every Driving Situation” SAE paper 880705
- Amano Y. Matsuchige S. Okamura Y. Eto K. “ELECTRO-HYDRAULIC POWER STEERING” Proceedings of 22nd ISATA 2 873 887
- Schamhorst T. “Beiträge der Fahrzeugtechnik zur Verbrauchssenkung” 13. VDI/VW-Gemeinschaftstagung, ATZ 96-5 1994 290 293
- Köpf P. “Trends and Alternatives in Power Steering Systems with Particular Emphasis on Energy Consumption” Technical Paper of FISITA Congress (ZZZ) 1994 317 323
- Goroncy J. “Hydraukle-Entwicklungstendenzen bei Pkw-Servolenkungen” Ōlhydraulik und pneumatik 39-9 1995 674 676
- Suzuki K. Inaguma Y. Haga K. Nakayama T. “Integrated Electro-Hydraulic Power Steering System with Low Electric Energy Consumption” SAE paper 950580