Study of Vibration of Electric Power Steering Systems Using a Continuous System Model

2017 ◽  
Author(s):  
Mary K. Freund ◽  
Es’hagh Farzaneh Joubaneh ◽  
Oumar R. Barry ◽  
Emad Y. Tanbour
Keyword(s):  
Electric Power ◽  
Equations Of Motion ◽  
Fuel Efficiency ◽  
Continuous System ◽  
Steering System ◽  
Mode Shapes ◽  
Electric Power Steering ◽  
Power Steering System ◽  
Power Steering ◽  
Hydraulic Power Steering

Electric power steering systems (EPS) offer better fuel efficiency than hydraulic power steering system. However, EPS systems are plagued with noise and vibrations, which can undermine the comfort of drivers. In previous works, steering systems have been analyzed using two degree of freedom system. In this paper, a mathematical model of an electric power steering system is presented using a continuous system to model the steering column. The equations of motion and boundary conditions are derived using Lagrangian method. Explicit expressions are presented for the characteristic equation and mode shapes. Parametric studies are conducted to study the effects of different parameters on natural frequency.

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

2018 ◽  
Vol 233 (6) ◽  
pp. 1623-1648 ◽  
Author(s):  
Ji In Park ◽  
Kawngki Jeon ◽  
Kyongsu Yi
Keyword(s):  
Electric Power ◽  
Steering System ◽  
Commercial Vehicles ◽  
Electric Power Steering ◽  
Hydraulic Power ◽  
Power Steering System ◽  
Power Steering ◽  
Electric Power Steering System ◽  
Hybrid Electric ◽  
Hydraulic Power Steering

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.

Fast fault-tolerant control of electric power steering systems in the presence of actuator fault

2018 ◽  
Vol 233 (12) ◽  
pp. 3088-3097 ◽  
Author(s):  
Manel Allous ◽  
Kais Mrabet ◽  
Nadia Zanzouri
Keyword(s):  
Electric Power ◽  
Electric Motor ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Steering System ◽  
Adaptive Observer ◽  
Electric Power Steering ◽  
Power Steering System ◽  
Power Steering ◽  
Electric Power Steering System

Electric power steering is an advanced steering system that uses an electric motor to improve steering comfort of the car. As a result, the failures in the electric motor can lead to additional fault modes and cause damage of the electric power steering system performance. Hence, to ensure the stability of this latter, the present paper proposes a new method to reconfigure the fault control. A novelty approach of fast fault estimation based on adaptive observer is also proposed. Moreover, to guarantee optimal and fast control, a fault-tolerant control based on inverse bond graph modeling is designed to construct the behavior of the nominal system. The simulation and the experimental results on a real electric power steering system reveal the importance of the control strategy and show that the proposed approach works as intended.

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