Energy Consumption of Electro-Hydraulic Steering Systems

Pfeffer, Peter E.; Johnston, D N; Sokola, M.; Harrer, Manfred

doi:10.4271/2005-01-1262

Cited by 18 publications

(11 citation statements)

References 2 publications

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“…where T c = D c 2p P s . Here, T c is the load torque of the hydraulic pump generated from the supply pressure that is derived in equations (10) to (12). w pump is the pump-rotation speed that is supposed to be same to the engine speed.…”

Section: Dynamic-model Correlation For the Proposed Driving Cyclementioning

confidence: 99%

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An investigation on the energy-saving effect of a hybrid electric-power steering system for commercial vehicles

Park

Jeon

2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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This article describes an investigation on the energy consumption of an alternative hybrid electric power steering system. The conventional hydraulic power steering system that is widely used in commercial vehicles can provide high steering-feel and reliability performances. However, since the combustion engine drives the pump, the hydraulic power steering system is energetically inefficient. To cope with this disadvantage of the hydraulic power steering system and to provide a technical base for the steering-related advanced driver assistance system, the Hybrid electric power steering system offers a solution for heavy commercial vehicles. The ''Hybrid'' of the title means that, for heavy commercial vehicles, the electric power steering system and electro-hydraulic power steering system are integrated in a ball-nut steering system. In this paper, to verify the energy-saving effect of the Hybrid electric power steering system, a dynamic model of the Hybrid electric power steering system was developed to estimate the energy consumption in the steering system. Furthermore, the fuel-efficiency test for the Hybrid electric power steering system were conducted while replacing the two steering systems (the conventional hydraulic power steering and Hybrid electric power steering system) in one vehicle on the chassis dynamometer for the proposed driving cycle. The driving cycle including the steering-angle profile has been developed to clearly investigate the effect on the energy-saving potential by the types of the steering system (hydraulic power steering and Hybrid electric power steering). The simulation results of the energy-consumption estimation showed that the hybrid electric power steering system can reduce the steering-system energy consumption by more than 50% under the proposed driving cycle. Also, the vehicle testing of the chassis dynamometer revealed that the Hybrid electric power steering system can improve the fuel efficiency of the vehicle by 1% for the specified driving cycle.

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Section: Dynamic-model Correlation For the Proposed Driving Cyclementioning

confidence: 99%

“…The mechanical and electrical dynamics of the MPU motor are expressed in equations (14) to (16). 10,11 The MPU motor is regarded as a DC motor to simplify the dynamics…”

Section: Modeling Of the Hybrid Eps Systemmentioning

confidence: 99%

An investigation on the energy-saving effect of a hybrid electric-power steering system for commercial vehicles

Park

Jeon

2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…I is the phase current, R is the resistance of the motor windings per phase and L is the phase inductance. Equation (7) shows that a rise in E must result in a drop of I at constant V.…”

Section: Simulated Ehps Motor Speed Responsementioning

confidence: 99%

Electrified hydraulic power steering system in hybrid electric heavy trucks

Morton

Spargo

Pickert

2014

IET Electrical Systems in Transportation

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Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractOver the last 20 years conventional automotive engine ancillaries have migrated from being mechanically powered to electrically powered in order to meet market demand. To adopt this trend in heavy trucks requires a higher power electrical system in order to cope with the higher loads placed upon it. Until the advent of the Hybrid Electric heavy Truck (HET) this power infrastructure has not been available. HET's require a higher voltage system in order to reduce losses and provide adequate power and voltage levels for the traction motor. This paper investigates for the first time the benefit of electrifying a Hydraulic Power assisted Steering (HPS) system in an HET. The developed Electrical Hydraulic Power Steering (EHPS), using a high voltage traction battery, is found to drastically reduce the consumed energy over a drive cycle by optimal operation of the pump over the driving cycle. Empirical data from a prototype HET with EHPS confirms the simulation results from Dymola.

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“…Several different solutions exist already that address both the problem of reducing the energy consumption and increasing the functionality of the steering system. Different solutions of the supply system was investigated in [13], and the so called Electro Hydraulic Power Assisted Steering (EHPAS) was investigated in [14], [15], [16], [17]. The EHPAS refer to systems where the supply pump is driven by an electric motor instead of the engine.…”

Section: Pressure Control In Hydraulic Power Steering Systemsmentioning

confidence: 99%

“…However, he also derives a 2 DoF model for the same purpose and also shows that the two models perform in a similar fashion. A 2 DoF model is also used to study the power consumption of an HPAS system, [15]. Baxter [31] also uses a simple model and ignores friction to derive expressions for steering gear feel and stiffness.…”

Section: Mechanical Modellingmentioning

confidence: 99%

Pressure Control in Hydraulic Power Steering Systems

Dell’Amico¹

2013

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There is a clear trend in the vehicle industry to implement more safetyrelated functions, where the focus is on active safety systems and today the steering system is also involved. Steering-related active safety functions can only be realised with a steering system that allows electronic control of either the road wheel angle or the torque required to steer the vehicle, called active steering. The high power requirement of heavy vehicles means they must rely on hydraulic power to assist the driver. The system is a pure hydro-mechanical system with an open-centre circuit activated by the driver's steering action and suffers from poor energy efficiency. The main task of the hydraulic system is to control the pressure in the assistance cylinder in such a way that it eases the load on the driver.This work suggests a way to design and evaluate a self-regulating pressure control valve for use as actuator in the steering system. This valve can be made small and fast and is electronically controlled to enable active steering. It is based on a closed-centre circuit and has therefore the potential to improve energy efficiency. The aim of this work has been to investigate the possibility for the valve to perform as the original open-centre valve. The suggested approach is a model-based design and evaluation process where an optimisation routine is used to design the valve. Together with a validated model of the steering system, the new concept is compared with the original system. A hardware-inthe-loop simulation test rig has also been designed and built with the possibility to test a closed-centre steering system. It has partly been used to support the modelling process and partly to verify that a closedcentre steering system is a feasible solution. The simulation results have shown that the designed valve can perform sufficiently well compared to the original system.

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Energy Consumption of Electro-Hydraulic Steering Systems

Cited by 18 publications

References 2 publications

An investigation on the energy-saving effect of a hybrid electric-power steering system for commercial vehicles

An investigation on the energy-saving effect of a hybrid electric-power steering system for commercial vehicles

Electrified hydraulic power steering system in hybrid electric heavy trucks

Pressure Control in Hydraulic Power Steering Systems

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