Abstract

This paper proposes a driving diagram, sets out a new steering torque control method derived from the diagram, and explains the effectiveness of this method. The driving diagram uses the actual steering angle δ of the front road wheels and the difference between the front tire slip angle and the rear tire slip angle βfr to express the vehicle behavior resulting from driver operation. The new steering torque control applies steering reaction torque to the driver in order to elicit the actual steering angle of the front road wheel that will bring about the most stable state of the vehicle. In this way, when the vehicle enters a spinning state, the driver can know the direction in which to steer in order to help stabilize the vehicle.Along with a discussion of the effectiveness of this driving diagram, the paper also provides the results of driving tests conducted using a vehicle equipped with Electric Power Steering (EPS) with steering torque control. These tests confirmed the effectiveness of this method for the vehicle in both under-steer and over-steer states.

References

1. (1) M. Yamamoto, Active Control Strategies for Improved Handling and Stability, Automotive Technology, Vol. 45, No. 3, p. 43 – 51 (1991) (in Japanese)
2. (2) N. Yuhara, S. Horiuchi, N. Asanuma, Y. Nishi, T. Kohata: Improvement of Vehicle Handling Quality Through Active Control of Steering Reaction Torque, Proc. of International Symposium AVEC, Yokohama, Japan, p. 407 – 412 (1992)
3. (3) Y. Amano, S. Doi, H. Kawaguchi: Improvement of active safety by active front steering angle and torque control, JSAE Proceedings, Vol. 30, No. 3, p. 87 – 92 (1998)
4. (4) M. Abe: Vehicle Dynamics and Control, Tokyo, Sankaido, p. 249 (1992) (in Japanese)
5. (5) S. Yamawaki, Y. Shimizu: A Study on Steering Torque Control Using driving Diagram at the Oversteer, Japan Mechanical Association, Traffic Distribution Division Conference, No. 99 – 59, p. 144 – 158 (1999) (in Japanese)
6. (6) A. Yoneda, Y. Shimizu: A Study on Control Performance of the Quick Steering Vehicle, Japan Mechanical Association, Traffic Distribution Division Conference, No. 98 – 37, p. 239 – 242 (1998) (in Japanese)
7. (7) Y. Shimizu, T. Kawai, J. Yuzuriha, S. Takimoto: A Study of a New Steering System with Variable Gear-ratio According to Vehicle Speed and Steering Wheel Angle. HONDA R&D Technical Review, Vol. 11, No. 1, p. 107 – 118 (1999) (in Japanese)

Author (organization or company)

• Shigeru YAMAWAKI（Tochigi R&D Center）
• Yasuo SHIMIZU（Tochigi R&D Center）

Publication Information

Article of Honda R&D Technical Review Vol.13 No.2 (99 - 106)

PDF

Citation Information