Title: Structure and performance of a novel electric power steering system integrated with active steering

Authors: Jianwei Wei; Minxiang Wei

Addresses: Department of Automotive Engineering, Ningbo University of Technology, Ningbo, 315016, China; Department of Automotive Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China ' Department of Automotive Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

Abstract: Based on the review of the primary functions, as well as defects of the existing electric power steering (EPS) and active steering respectively, a realization of active steering on existing EPS system is researched and a novel EPS system integrated with active steering is introduced. According to the working principle of double planetary gear train, decoupling control of force and angular displacement is realised. To study the effects of the proposed novel EPS system on vehicle's steering performance, mathematical models are built and then amplitude-frequency characters of steering feeling and steering sensitivity, as well as stability are investigated. Results indicate that road information can be measured by the torque sensor without any installation position changing, compared with that of existing EPS system and no other torque sensor is needed. Meanwhile, perfect combination of force and angular displacement can be obtained by the novel EPS system.

Keywords: electric power steering; active steering; steering feeling; steering sensitivity; road information; double planetary gear train; decoupling control; vehicle performance; mathematical modelling; torque sensors; force; angular displacement.

DOI: 10.1504/IJVD.2014.060067

International Journal of Vehicle Design, 2014 Vol.65 No.1, pp.94 - 113

Accepted: 29 Nov 2012
Published online: 26 Feb 2014 *

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