Development of EHPS Motor Speed Map Using HILS System

Kim, Seong Han; Shin, Min Chul; Chu, Chong Nam

doi:10.1109/tvt.2012.2228887

Cited by 21 publications

(16 citation statements)

References 16 publications

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“…The steering resistance mainly consists of two moments, namely, the self-aligning moment and the moment by king pin inclination. 24 Therefore, the steering resistance can be approximated by…”

Section: Vehiclementioning

confidence: 99%

An electronically controlled hydraulic power steering system for heavy vehicles

Xia

Jiang

2016

Advances in Mechanical Engineering

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To remedy the existing problems concerning vehicle handling for the heavy vehicle hydraulic power steering system, this article investigates a type of electronically controlled hydraulic power steering system, which can realize variable assistance characteristics and improve high-speed steering feel. To this end, a controlled electrohydraulic proportional valve is mounted in parallel with the rotary valve to regulate the flow rate through the rotary valve on demand according to vehicle speed and steering rate. After a system description in terms of structure and working principle, mathematical modeling of the electronically controlled hydraulic power steering system, vehicle, and steering resistance is conducted. To realize accurate tracking of valve spool displacement under parameter uncertainty and external disturbance, an adaptive dynamic surface control scheme is proposed for the electrohydraulic proportional valve. Numerical simulations and field tests are performed to validate the effectiveness and applicability of the electronically controlled hydraulic power steering system. The results show that the electronically controlled hydraulic power steering system can significantly improve high-speed steering feel compared with the hydraulic power steering system while maintaining the similar performance of low-speed steering portability.

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Section: Vehiclementioning

confidence: 99%

An electronically controlled hydraulic power steering system for heavy vehicles

Xia

Jiang

2016

Advances in Mechanical Engineering

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“…The HILS technique has many advantages to overcome restrictions on test spaces and to save costs and times for test and development [12][13][14]. Initially, HILS has been used for analysis and test of costly systems such as automotive system, aircraft system and so on [15][16].…”

Section: Hils Systemmentioning

confidence: 99%

Development of Hardware-in-the-Loop Simulation System to Test HVDC Controllers

Son¹,

Yoo²,

Kim

2014

IJCA

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“…They can be divided into three systems according to the location of this electric motor -Column-type (C-EPS), Pinion-type (P-EPS) and Rack-type (R-EPS) (Kim and Chu, 2016). Among these systems, C-EPS, which has an electric motor on its column, is the most widely used in passenger vehicles because of its advantages over the other systems such as low cost and small space usage (Kim et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Worm gear efficiency model considering misalignment in electric power steering systems

Kim

2018

Mech. Sci.

Self Cite

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Abstract. This study proposes a worm gear efficiency model considering misalignment in electric power steering systems. A worm gear is used in Column type Electric Power Steering (C-EPS) systems and an Anti-Rattle Spring (ARS) is employed in C-EPS systems in order to prevent rattling when the vehicle goes on a bumpy road. This ARS plays a role of preventing rattling by applying preload to one end of the worm shaft but it also generates undesirable friction by causing misalignment of the worm shaft. In order to propose the worm gear efficiency model considering misalignment, geometrical and tribological analyses were performed in this study. For geometrical analysis, normal load on gear teeth was calculated using output torque, pitch diameter of worm wheel, lead angle and normal pressure angle and this normal load was converted to normal pressure at the contact point. Contact points between the tooth flanks of the worm and worm wheel were obtained by mathematically analyzing the geometry, and Hertz's theory was employed in order to calculate contact area at the contact point. Finally, misalignment by an ARS was also considered into the geometry. Friction coefficients between the tooth flanks were also researched in this study. A pin-on-disk type tribometer was set up to measure friction coefficients and friction coefficients at all conditions were measured by the tribometer. In order to validate the worm gear efficiency model, a worm gear was prepared and the efficiency of the worm gear was predicted by the model. As the final procedure of the study, a worm gear efficiency measurement system was set and the efficiency of the worm gear was measured and the results were compared with the predicted results. The efficiency considering misalignment gives more accurate results than the efficiency without misalignment.

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Development of EHPS Motor Speed Map Using HILS System

Cited by 21 publications

References 16 publications

An electronically controlled hydraulic power steering system for heavy vehicles

An electronically controlled hydraulic power steering system for heavy vehicles

Development of Hardware-in-the-Loop Simulation System to Test HVDC Controllers

Worm gear efficiency model considering misalignment in electric power steering systems

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