Transcript FSAE Paddle Shift System EML 4551

KAR Quick Shift
for FSAE Vehicle
EML 4551
Kai Vecchio
Andrew Sauer
Robert Esperon
FSAE Paddle Shift System
-
Problem Statement
Motivation / Objectives
Design Intent
Initial Cost Analysis
Problem Statement
- Traditional Shift Method slow and inefficient
in fast paced enviornment.
- Design a quick shift system that allows driver
to maintain both hands on the steering wheel.
Motivation
- Increased driver concentration and safety.
- Better control of the vehicle and faster
reaction times.
- First for FIU FSAE, and hope to set the
standard.
Motivation
Objectives
- Match the reliability of standard shift lever
and clutch pedal set up.
- Match the weight of previous shifter set up.
- Shift time under 1 second
- Cost under $1,000
- Quick, and clean shifts.
Design - Paddles
Design - Paddles
•
Shows the distance allowable for the paddles
•
Prototype uses a conductive cord or could be modified to use a wire fed design
Design - Paddles
•
Displays an in depth look at a new design using a snap action lever switch
•
Modified positioning of the paddles and modified the bracket
Design - Paddles
•
Latest design with a push
button switch
•
Renovated paddle and
lever bracket
•
Difficulty surrounding
positioning of the system
Design – Gear Shift
-
Pneumatic cylinders to drive gear shift
Double acting cylinder
20lbf required in push or pull direction
-
Choice of Bimba because “Bimba Manufacturing Company is an ISO 9001:
2008 certified company.”
-
¾ cylinder allows more flexibility for pressure loss, design error, etc (Cost difference minimal)
Working
Pressures(PSI)
40
60
80
100
120
140
Bimba 9/16
Thrust
Pull
9.940092
14.91014
19.88018
24.85023
29.82028
34.79032
8.84152
13.26228
17.68304
22.1038
26.52456
30.94532
lbf
Bimba 3/4
Thrust
Pull
17.67128
26.50691
35.34255
44.17819
53.01383
61.84946
15.7078
23.5617
31.4156
39.2695
47.1234
54.9773
Design – Gear Shift
- Cylinder mounted to reduce risk of piston rod
buckling
-
TBD – Clutch Actuation – linked to pneumatic assembly or separate electric
actuator
Design – Pneumatic Assembly
-
Solenoids used to control flow
Normally closed – 12v rated
-
Flow through Polyurethane Clear Tubing
(Min.) Durometer 80A – Rated - 130 PSI – 220 (F)
-
ASTM D2240 - 05(2010)
-
Standard Test Method for Rubber Property—Durometer Hardness
-
TBD – Flow Regulator, Fluid Reservoir (9, 12, 20 oz tanks)
Design – Closed Circuit
- 12v supply from vehicle
- Microcontroller to send signal to solenoid
after receiving signal from driver (Arduino,
PIC, TI)
- Transistor between microcontroller and
solenoids
Initial Cost Analysis
Part
Pnuematic Cylinder
Rubber Tubing (Bundle)
Solenoid
Regulator
Tank
Microcontroller
Cost (usd $)
30
20
30
30
20
2
Qauntitiy
1
1
2
1
1
1
Total (usd $)
30
20
60
30
20
2
162
Conclusion
-
Problem Statement
Motivation / Objectives
Design Intent
Initial Cost Analysis
Gantt Chart
Table 1: Gantt Chart for KAR Quick Shift System
Feb
Team Selection
Project Selection
Literature Survey
Conceptual Design
Development
Begin Design
Development
Analysis of Design
Prototype
Construction
Testing and
Evaluation
Conclusion
Mar
Apr
May
Jun
July
Aug
Sept
Oct
Nov
Dec