Browse > Article
http://dx.doi.org/10.7467/KSAE.2014.22.6.059

Development of New Numerical Model and Controller of AFS System  

Song, Jeonghoon (Department of Mechatronics Engineering, Tongmyong University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.22, no.6, 2014 , pp. 59-67 More about this Journal
Abstract
A numerical model and a controller of Active Front wheel Steer (AFS) system are designed in this study. The AFS model consists of four sub models, and the AFS controller uses sliding mode control and PID control methods. To test this model and controller an Integrated Dynamics Control with Steering (IDCS) system is also designed. The IDCS system integrates an AFS system and an ARS (Active Rear wheel Steering) system. The AFS controller and IDCS controller are compared under several driving and road conditions. An 8 degree of freedom vehicle model is also employed to test the controllers. The results show that the model of AFS system shows good kinematic steering assistance function. Steering ratio varies depends on vehicle velocity between 12 and 24. Kinematic stabilization function also shows good performance because yaw rate of AFS vehicle tracks the reference yaw rate. IDCS shows improved responses compared to AFS because body side slip angle is also reduced. This result also proves that AFS system shows satisfactory result when it is integrated with another chassis system. On a split-m road, two controllers forced the vehicle to proceed straight ahead.
Keywords
Additional steering angle; AFS(Active Front wheel Steering); Body side slip angle; IDC(Integrated Dynamics Control); Yaw rate;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 W. Oraby, "Improvement of Vehicle Lateral Stability during Overtaking Process by Active Front Steering System," SAE 2007-01-0810, 2007.
2 F. Yu, D. F. Li and D. Crolla, "Integrated Vehicle Dynamics Control-state-of-the Art Review," Vehicle Power and Propulsion Conference, VPPC '08, IEEE, pp.1-6, 2008.
3 W. Klier, G. Reimann and W. Reinelt, "Concept and Functionality of the Active Front Steering System," SAE 2004-21-0073, 2004.
4 J. Y. Zhang, J. W. Kim, K. B. Lee and Y. B. Kim, "Development of an Active Front Steering (AFS) System with QFT Control," Int. J. Automotive Technology, Vol.9, No.6, pp.695-702, 2008.   과학기술학회마을   DOI
5 C. S. Namuduri, S. Gopalakrishnan, B. V. Murty, R. Bolio and R. Feller, "Robust Control of Low-cost Actuator for Automotive Active Front Steering Application," Energy Conversion Congress and Exposition (ECCE), pp.2108-2114, 2009.
6 J. Song, "Development and Comparison of Integrated Dynamics Control Systems with Fuzzy Logic Control and Sliding Mode Control," J. Mechanical Science and Technology, Vol.27, No.6, pp.1853-1861, 2013.   과학기술학회마을   DOI   ScienceOn
7 J. Song, "Integrated Control of Brake Pressure and Rear Wheel Steering to Improve Lateral Stability with Fuzzy Logic," Int. J. Automotive Technology, Vol.13, No.4, pp.563-570, 2012.   과학기술학회마을   DOI   ScienceOn
8 J. He, Integrated Vehicle Dynamics Control Using Active Steering, Driveline and Braking, Ph. D. Dissertation, University of Leeds, Leeds, 2005.