This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Traction Control System of the 2011 Cooper Union FSAE Vehicle
Technical Paper
2011-01-1108
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
A critical limitation preventing newer FSAE teams from improving
in the international rankings is that of the person-machine
interface, where driver inexperience and lack of training lead to
loss of traction. The Traction Control System (TCS) described here
uses closed-loop control of available engine power via spark
retardation. Two distinct, driver-selectable algorithms were
developed which govern TCS operation for either 1) launch control
for the straight line acceleration event, or 2) full traction
control for all other dynamic events.
Launch control uses a spark retard rev limit to allow the driver
to hold the engine at the ideal RPM for easy rev matching via flat
foot shifting. Wheel speeds are simultaneously monitored to achieve
ideal tire slip ratios. The full traction control algorithm uses
the launch control method as a basis, but also addresses potential
need for corner exit oversteer or engine braking. Front and rear
accelerometers determine when the car is in an oversteer condition.
Dynamometer data have been acquired off a tuned engine to assist in
the initial PID gains used on the track.
The vehicle was instrumented with 1) wheel encoders and Hall
effect sensors at every wheel, 2) potentiometers on the brake,
accelerator, and clutch pedals, and 3) two MEMs-based accelerometer
chips. These signals were sent to a Microchip® dsPIC® linked to the
ECU via CAN. These systems are all detailed along with their
functional requirements and engineering specifications; guidelines
for their implementation within a CAN-based vehicle network were
outlined. The preliminary results presented here are encouraging
and illustrate the effectiveness of this system, which is a work in
progress. Lessons learned from how this project was integrated
within the school curriculum are also presented.
Recommended Content
Topic
Citation
Fedullo, T. and Delagrammatikas, G., "The Traction Control System of the 2011 Cooper Union FSAE Vehicle," SAE Technical Paper 2011-01-1108, 2011, https://doi.org/10.4271/2011-01-1108.Also In
References
- Gillespie, T.D. “Fundamentals of Vehicle Dynamics,” SAE International Warrendale, PA 978-1-56091-199-9 1992
- Robertson, D. Delagrammatikas, G. “The Suspension System of the 2009 Cooper Union FSAE Vehicle: A Comprehensive Design Review,” SAE Int. J. Passeng. Cars - Mech. Syst. 3 1 366 380 2010 10.4271/2010-01-0311
- Milliken, W.F. Milliken, D.L. “Race Car Vehicle Dynamics,” SAE International Warrendale, PA 978-1-56091-526-3 1994
- Enomoto, H. Nakao, H. Fukunaga, Y. Maeda, T. et al. “Development of the Traction Control System with the Custom Electrical Control Unit for the Formula SAE Car,” SAE Technical Paper 2007-32-0119 2007
- Internal Combustion Engine Fundamentals Heywood, John McGraw-Hill Inc New York 1988
- Lyon, K. Philipp, M. Grommes, E. “Traction Control for a Formula 1 Race Car: Conceptual Design, Algorithm Development, and Calibration Methodology,” SAE Technical Paper 942475 1994 10.4271/942475
- Jawad, B. Hachem, N. Cizmic, S. Leese, J. et al. “Traction Control Applications in Engine Control,” SAE Technical Paper 2000-01-3464 2000 10.4271/2000-01-3464