A Low Cost System for Active Gear Shift and Clutch Control

2015-01-0228

4/14/2015

Authors
Abstract
Content
The objective of this study is to demonstrate the design and construction of an innovative active gear-shift and clutch for racecars, applied to a Formula Student car, based on the use of DC gear-motors. Racecars require extremely quick gear-shifts and every system to be as light as possible. The proposed solution is designed to reduce energy consumption, weight and improve gear-shift precision compared to traditionally employed electro-hydraulic solutions, although maintaining state of the art performances. The proposed gear motor actuation satisfies all the above objectives: energy can be saved by removing the need for power when clutch is not pulled, thus improving efficiency; by substituting the entire electro-hydraulic-systems, that accounts for approx. 5% of the overall car weight (10kg); a significant weight reduction is achieved (weight is reduced to 2kg); a fine actuation force modulation, in order to properly shift to neutral, can easily obtained with an DC electric motor; and, above all, shifting time is less than 20ms. System modeling, regulator design, based on PI-control, and simulation were carried out. Electronics, both signal and power, micro-controller based design and program coding, written in C language, were the next steps. Finally, accurate tests to validate the solution and assess performances were carried out.
Meta TagsDetails
Citation
Braghin, F. and Salis, F., "A Low Cost System for Active Gear Shift and Clutch Control," SAE 2015 World Congress & Exhibition, Detroit, Michigan, United States, April 21, 2015, .
Additional Details
Publisher
Published
4/14/2015
Product Code
2015-01-0228
Content Type
Technical Paper
Language
English