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

Based on the review of the primary functions, as well as defects of the existing electric power steering (EPS) and active steering respectively, a realisation 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.

[1]  Yong-San Yoon,et al.  Design of Two Wheel Steer Vehicle Using Optimal Control Algorithm of Four Wheel Steer , 1993 .

[2]  Konghui Guo,et al.  A study on speed-dependent tyre–road friction and its effect on the force and the moment , 2005 .

[3]  Willy Klier,et al.  Concept and Functionality of the Active Front Steering System , 2004 .

[4]  R Chabaan.  Control of electrical power assist systems: H∞ design, torque estimation and structural stability , 2001 .

[5]  J. Ackermann.  Robust decoupling of car steering dynamics with arbitrary mass distribution , 1994, Proceedings of 1994 American Control Conference - ACC '94.

[6]  Jae-Bok Song,et al.  Control logic for an electric power steering system using assist motor , 2002 .

[7]  Yoshiaki Tsuchiya,et al.  Development of Active Front Steering Control System , 2005 .

[8]  John Baxter.  Analysis of Stiffness and feel for a Power-Assisted Rack and Pinion Steering Gear , 1988 .

[9]  T. Nakayama,et al.  The present and future of electric power steering , 2014 .

[10]  N. Matsui,et al.  Decoupling Control of Electric Power Steering System with Variable Gear Transmission System , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[11]  Jaesuk Kim,et al.  A Control Strategy to Compensate the Reaction Torque of Active Front Steering System , 2007 .

[12]  John D'Azzo,et al.  Linear Control System Analysis and Design: Fifth Edition, Revised and Expanded , 2003 .

[13]  Jürgen Ackermann,et al.  Automatic car steering control bridges over the driver reaction time , 1997, Kybernetika.

[14]  F. J. Adams.  POWER STEERING "ROAD FEEL" , 1983 .

[15]  S. J. Xu,et al.  Robust sliding mode observer for automatic steering of vehicles , 2000, ITSC2000. 2000 IEEE Intelligent Transportation Systems. Proceedings (Cat. No.00TH8493).

[16]  Zhao Liu,et al.  The optimization of electric power assisted steering to improve vehicle performance , 2003 .

[17]  Willy Klier,et al.  Active Front Steering (Part 2): Safety and Functionality , 2004 .

[18]  Chang-Soo Han,et al.  The Development of an Advanced Control Method for the Steer-by-Wire System to Improve the Vehicle Maneuverability and Stability , 2003 .

[19]  Yasuji Shibahata,et al.  Analysis on Steering Gain and Vehicle Handling Performance with Variable Gear-ratio Steering System(VGS) , 2000 .