Abstract
In this paper, an analytical model with suitable vehicle parameters, together with a multi-body model is proposed to predict steering returnability in low-speed cornering with what is expected to be adequate precision as the steering wheel moves from lock to lock. This model shows how the steering response can be interpreted in terms of vertical force, lateral force with aligning moment, and longitudinal force. The simulation results show that vertical steering rack forces increase in the restoring direction according to steering rack displacement for both the inner and outer wheels. As lateral forces due to side-slip angle are directed toward the medial plane of the vehicle in both wheels, the outer wheel pushes the steering wheel in the returning direction while the inner wheel does not. In order to improve steering returnability, it is possible to increase the total steering rack force in both road wheels through adjustments to the kingpin axis and steering angle. This approach is useful for setting up a proper suspension geometry during conceptual chassis design.
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Abbreviations
- τ :
-
caster angle
- σ :
-
kingpin inclination angle
- λ :
-
spatial kingpin angle with relation to vertical direction
- β :
-
camber angle
- r c :
-
kingpin offset at ground
- n c :
-
caster trail
- n r :
-
pneumatic trail
- r w :
-
kingpin offset at wheel center
- n w :
-
caster offset
- δ :
-
steer angle
- M t :
-
kingpin axis moment
- V x :
-
longitudinal velocity
- fr, fl:
-
front right, front left
- o, i:
-
outer, inner
- v, l, d:
-
vertical, lateral, driving
References
Cho, Y. G. and Lee, U. K. (2004). Simulation of steering kickback using component load method. SAE Paper No. 2004-01-1097.
Gough. V. E. (1953). The application of power assistance to the steering of wheeled vehicles. Proc. Auto. Div. Instn. Mech. Engrs., 82.
Hwang, T. H., Park, K., Heo, S-J., Lee, S. H. and Lee, J. C. (2008). Design of integrated chassis control logics for AFS and ESP. Int. J. Automotive Technology 9,1, 17–28.
Pitts, S. and Wildig, A. W. (1978). Effect of steering geometry on self-centering torque and ‘feel’ during lowspeed maneuvers. Automotive Engineer 3,3, 45–48.
Kim, D. H., Tak, T. O., Kuk, M. G., Park, J. S., Shin, S. E., S. J. Song, H. H. Chun, C. K. Kim, S. S. Cho and Cho, N. Y. (1997). Evaluation and experimental validation of steering efforts considering tire static friction torque and suspension and steering systems characteristics. SAE Paper No. 2007-01-3641.
Kurishiege, M., Wade, S., Kifuku, T., Inoue, N., Nishiyama, R. and Otagaki, S. (2000). A new EPS control strategry to improve steering wheel returnability. SAE Paper No. 2000-01-0815.
Lee, H. I., Jung, Y. J. and Im, S. B. (2004). Statistical analysis of K&C characteristics using SPMD DATABASE. Spring Conf. Proc., Korean Society Automotive Engineers, 642–648.
Matschinsky, W. (2000). Road Vehicle Suspensions. Professional Engineering Publishing Limited.
Park, I. L., Lee, B. L. and Oh, J. H. (2007). Improvement of returnability in the electric power steering vehicle. Fall Conf. Proc., Korean Society Automotive Engineers, 604–609.
Pfeffer, P. E. and Harrer, M. (2008). On-centre steering wheel torque characteristics during steady state cornering. SAE Paper No. 2008-01-0502.
Schmitt, P. D. (2003). Prediction of static steering torque during brakes-applied parking. SAE Paper No. 2003-01-3430.
Sharp, R. S. and Granger, R. (2003). On car steering torques at parking. Int. J. Mechanical Engineering: Part D, 217, 87–96.
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Cho, Y.G. Vehicle steering returnability with maximum steering wheel angle at low speeds. Int.J Automot. Technol. 10, 431–439 (2009). https://doi.org/10.1007/s12239-009-0049-6
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DOI: https://doi.org/10.1007/s12239-009-0049-6