Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Improvement of the Steering Feel of an Electric Power Steering System by Torque Map Modification

  • Lee Man Hyung (School of Mechanical Engineering, Pusan National University) ;
  • Ha Seung Ki (Department of Interdisciplinary Program in Mechatronics, Pusan National University) ;
  • Choi Ju Yong (Department of Mechanical and Intelligent Systems Engineering, Pusan National University) ;
  • Yoon Kang Sup (School of Automative, Industrial and Mechanical Engineering, Daeku University)
  • Published : 2005.03.01
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Abstract

This paper discusses a dc motor equipped electric power steering (EPS) system and demonstrates its advantages over a typical hydraulic power steering (HPS) system. The tire-road interaction torque at the steering tires is calculated using the 2 d.o.f. bicycle model, in other words by using a single-track model, which was verified with the J-turn test of a real vehicle. Because the detail parameters of a steering system are not easily acquired, a simple system is modeled here. In previous EPS systems, the assisting torque for the measured driving torque is developed as a boost curve similar to that of the HPS system. To improve steering stiffness and return-ability of the steering system, a third-order polynomial as a torque map is introduced and modified within the preferred driving torques researched by Bertollini. Using the torque map modification sufficiently improves the EPS system.

Keywords

References

  1. Ackermann, J. and Darenberg, W., 1990, 'Automatic Track Control of a City Bus,' IFAC Theory Report on Benchmark Problem for Control Systems Design
  2. Adams, F. J., 1983, 'Power Steering Road Feel,' SAE Paper 830998
  3. Anthony W. Burton, 2003, 'Innovation Drivers for Electric Power-Assisted Steering,' IEEE Control Systems Magazine, pp. 30-39 https://doi.org/10.1109/MCS.2003.1251179
  4. Camuffo, I., Caviasso, G., Paseali, L., Pesce, M. and Alviano, E., 2002, 'Simulation Tools and Evaluation Criteria for Steering Wheel Feel Improvement of an Electric Power Steering System,' SAE Paper 2002-01-1593
  5. Chabaan, R. C. and Wang, L. Y., 2001, 'Control of Electrical Power Assist Systems : H${\infty}$ Design, Torque Estimation and Structural Stability,' JSAE Review 22, pp. 435-444 https://doi.org/10.1016/S0389-4304(01)00126-6
  6. Choi, J. Y. , Hong, S. J., Park, K. T., Yoo, W. S. and Lee, M. H., 2002, 'Lateral Control of Autonomous Vehicle by Yaw Rate Feedback,' KSME International Journal, Vol. 16, No. 3, pp. 338-343
  7. Gary P. Bertonini, Robert M. Hogan, 1999, 'Applying Driving Simulation to Quantify Steering Effort Preference as a Function of Vehicle Speed,' SAE Paper 1999-01-0394
  8. Hollg, S., Lee, M. H., Rios, J. A. and Speyer, J. L., 2002, 'Observability Analysis of INS with a GPS Multi-Antenna System,' KSME International Journal, Vol. 16 No. 11, pp. 1367-1378
  9. Kim, J. H. and Song, J. B., 2002, 'Control Logic for an Electric Power Steering System Using Assist Motor,' Mechatronics 12, pp. 447-459 https://doi.org/10.1016/S0957-4158(01)00004-6
  10. Kurishige, M. , Wada, S., Kifuku, T., Inoue, N., Nishiyama, R. and Otagaki, S., 2000, 'A New EPS Control strategy to Improve steering Wheel return-ability,' SAE Paper 2000-01-0815
  11. Norman, K. D, 1984, 'Objective Evaluation of On-center Handiing Performance,' SAE Paper 840069
  12. Thomas D. Ginespic, 1992, Fundamentals of Vehicle Dynamics, SAE Inc., pp. 284-291
  13. Tong Jin Park, Se Wook Oh, Jae Ho Jang and Chang Soo Han, 2002, 'The Design of a Controller for the Steer-by-Wire System Using the Hardware-In-the-Loop-Simulation System,' SAE Paper 2002-01-1596