This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Methodology to Determine Optimum Suspension Hard Points at an Early Design Stage for Achieving Steering Returnability in Any Vehicle
ISSN: 0148-7191, e-ISSN: 2688-3627
Published January 09, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Steering returnability while driving is one of the most important parameter which affects the drive pleasure and handling of a vehicle. Steering returnability refers to the automatic returning response of the steering wheel after taking a full turn while vehicle is being steered during driving. Evaluating steering response characteristics of any vehicle in a virtual environment at early stage of a product development saves significant development time and cost. Through this paper an attempt has been made to develop a methodology for selection of suspension hard points which influences steering returnability characteristics of a vehicle at an early product design stage. Conventionally, suspension kinematic parameters such as Caster angle, Steering axis inclination (SAI), etc. are iterated during vehicle design stage to achieve desired Steering returnability. However, at times vehicle level trials indicate that increasing caster angle or SAI does not guarantee a desirable increase in steering returnability. In this new methodology a set of iterative trials are done to vary hard points (X, Y, Z co-ordinates) of Lower ball joint of an independent front suspension to create desired Jacking effect  or differential vertical lifting [1, 2] at front wheel end of the vehicle during steer condition to facilitate and impart self-returning motion at steering wheel. Vehicle level test results conducted on a vehicle indicates an improvement in steering returnability by around 50% with reference to the base vehicle in which hard point modifications were incorporated to validate this methodology. This methodology can be applied to other vehicles during their early design stage for faster and first time right approach.
|Technical Paper||Heavy and Medium Duty Vehicle Suspension-Related Performance Issues and Effective Analytical Models for System Design Guide|
|Technical Paper||Automotive Steering Sensors|
CitationKhanna, N., Jyoti, M., S, U., Senthi, K. et al., "Methodology to Determine Optimum Suspension Hard Points at an Early Design Stage for Achieving Steering Returnability in Any Vehicle," SAE Technical Paper 2019-26-0074, 2019, https://doi.org/10.4271/2019-26-0074.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
|[Unnamed Dataset 2]|
|[Unnamed Dataset 3]|
|[Unnamed Dataset 4]|
|[Unnamed Dataset 5]|
- Gillespie, T.D., Fundamentals of Vehicle Dynamics (Warrandale: SAE International, 1992). ISBN:978-1-56091-199-9.
- Bastow, D., Howard, G., and Whitehead, J.H., Car Suspension and Handling (Warrandale: SAE International, 2004). ISBN:0-7680-0872-7.
- Taborek, J.J., Mechanics of Vehicles (Penton Publishing Co.), EDC Library Ref. No. 1110.
- Avachat, R., Mahajan, J.S., and Gopalakrishna, K., “Development of Methodology for Improvement in Steering Returnability,” SAE Technical Paper 2008-01-0494, 2008, doi:10.4271/2008-01-0494.
- Milliken, W.F. and Milliken, D.L., Race Car Vehicle Dynamics (Warrandale: SAE International, 1994). ISBN:978-1-56091-526-3.
- Reimpell, H.S. and Betzler, J.W., Automotive Chassis (Warrandale: SAE International, 2001). ISBN:978-0-7680-0657-5.
- Kurishige, M., Wada, S., Kifuku, T., Inoue, N. et al., “A New EPS Control Strategy to Improve Steering Wheel Returnability,” SAE Technical Paper 2000-01-0815, 2000, doi:10.4271/2000-01-0815.
- Hong, T. and Park, K., “A New Steering Wheel Returnability Control Strategy for On-Center Handling Performance,” SAE Technical Paper 2011-28-0079, 2011, doi:10.4271/2011-28-0079.
- Small, R.D., Susprog 3D Designer (version 4.5155A), Computer Software, 2012.