Improved Fuel Consumption through Steering Assist with Power on Demand

Document Number: 2008-21-0046

Date Published: October 2008

Author(s):
Michael Wellenzohn - ThyssenKrupp Presta

Abstract:
The paper compares hydraulic, electro-hydraulic, and electric power steering in terms of power consumption and possible innovative features:

Conventional hydraulic-assisted power steering: Good steering performance. High energy consumption because hydraulic pump is constantly driven by combustion engine. Innovative steering functions are not possible with this technology.

Electro-hydraulic power steering: Good steering performance. Reduced energy consumption because hydraulic pump is driven by continuously operating electric motor. Rpm of motor is depending on requested steering assist: partial power on demand. Innovative steering functions are not possible with this technology.

Electric power steering: Minimal energy consumption due to power on demand: electric motor runs only when steering assist is required by driver. Enabling technology for advanced vehicle control functions.

Besides the obvious advantages in power consumption this paper will also address the challenges regarding system performance which need to be considered before bringing the EPAS on the road, such as steering feel, safety according to SIL3, power density, requirement for new features, and last but not least cost.

File Size: 968K
Product Status: In Stock

See other papers presented at Convergence 2008, October 2008, Detroit, MI, USA, Session: Energy Stewardship: The Efficient Generation and Consumption of Electrical Energy in Automobiles

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