The Traction Control System of the 2011 Cooper Union FSAE Vehicle Cooper Union

Format:

Conference/Event

Author/Creator:

Fedullo, Fedullo, author.

Contributor:

Delagrammatikas, George J.

Conference Name:

SAE 2011 World Congress & Exhibition (2011-04-12 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

A critical limitation preventing newer FSAE teams from improvingin the international rankings is that of the person-machineinterface, where driver inexperience and lack of training lead toloss of traction. The Traction Control System (TCS) described hereuses closed-loop control of available engine power via sparkretardation. Two distinct, driver-selectable algorithms weredeveloped which govern TCS operation for either 1) launch controlfor the straight line acceleration event, or 2) full tractioncontrol for all other dynamic events.Launch control uses a spark retard rev limit to allow the driverto hold the engine at the ideal RPM for easy rev matching via flatfoot shifting. Wheel speeds are simultaneously monitored to achieveideal tire slip ratios. The full traction control algorithm usesthe launch control method as a basis, but also addresses potentialneed for corner exit oversteer or engine braking. Front and rearaccelerometers determine when the car is in an oversteer condition.Dynamometer data have been acquired off a tuned engine to assist inthe initial PID gains used on the track.The vehicle was instrumented with 1) wheel encoders and Halleffect sensors at every wheel, 2) potentiometers on the brake,accelerator, and clutch pedals, and 3) two MEMs-based accelerometerchips. These signals were sent to a Microchip® dsPIC® linked to theECU via CAN. These systems are all detailed along with theirfunctional requirements and engineering specifications; guidelinesfor their implementation within a CAN-based vehicle network wereoutlined. The preliminary results presented here are encouragingand illustrate the effectiveness of this system, which is a work inprogress. Lessons learned from how this project was integratedwithin the school curriculum are also presented

Notes:

Vendor supplied data

Publisher Number:

2011-01-1108

Access Restriction:

Restricted for use by site license