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System for Engine Location Of
a Web Train
Project Proposal -CTCDS
Paul Wimmer and Adam Weintrop
Dr. Irwin and Dr. Schertz
12/5/05
Outline
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Introduction
Functional Description
Block Diagram
Standards
Schedule
Equipment List
Conclusion
2
Introduction
Engine Location
Current Sensors
Engine Location System
Average Speed
The “Web Train” is a n-scale model train that is
controlled by a remote user. The Engine Location
System will determine the location and speed of the
engine
3
Future Applications
• At the end of the year – a fully functional
web train
• At the end of ten years – a system for toxic
manufacturing automation
• At the end of 50 years – a underground
mining operation on Mars
4
Outline
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Introduction
Functional Description
Block Diagram
Standards
Schedule
Equipment List
Conclusion
5
Functional Description
Train Track
segments
Input
Hardware
system
Microcontroller
Output
Computer
6
Outline
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Introduction
Functional Description
Block Diagram
Standards
Schedule
Equipment List
Conclusion
7
Hardware Block Diagram
Inputs
Current Sensors
(Resistors across
track segments)
System
Amplifier
Outputs
Analog to Digital
Converter
Multiplexer
Microcontroller I/O
Ports
8
Current Sensing Methods
Method
Pros
Cons
Built in the
microprocessor board, #
of trains
Requires more software
10-bit
Can determine # of
trains and # of cars
Expensive
“2-bit”
“2-bit” method can be
designed cheap enough
to have the A/D on every
track segment, this
reduces analog related
problems
Cannot determine # of
trains
8-bit with variable
range
9
Hardware Block Diagram
Inputs
System
Outputs
Current Sensors
(Resistors across
track segments)
Amplifier
Analog to Digital
Converter
Multiplexer
Microcontroller I/O
Ports
10
Hardware Design
11
Hardware Simulations
Both low
(resistor is
carrying
High current)
No current through resistor
One high, one low
(resistor is
carrying low
Current)
12
Software Flow Chart
Gather Data
Determine weather
the train is on this
segment of track
Compute Values
Compare velocity
to a known amount
of time
Compare position
to a known amount
of time
Compute the
velocity
Compute the
Acceleration
Compare to the
previous segment
of track
L o ca t
ion
Compare to lookup table values
New
Sample an input
Send position,
velocity and
acceleration
information to the
CPU
Get New Data
Switch digital
inputs
Same train location / train
not in motion
13
Software Design
Track Layout
14
Software Design
Track Section 1
Track Section 2
Current
Current
Current
of
ofSection
of
Section
Section
11<>
=Current
Currentof
of
Section
Section
Section
2 22
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Expansion to more Track Sections
• With only the inner loop, we cannot test
direction
4
3
Must check
2 and 3
Must check 4
And 1
This is just
4 – this must
Be done with
21 segments
1
Train
2
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Outline
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Introduction
Functional Description
Block Diagram
Standards
Schedule
Equipment List
Conclusion
17
Standards
DCC Standard
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Outline
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Introduction
Functional Description
Block Diagram
Standards
Schedule
Equipment List
Conclusion
19
Schedule – Gantt Chart
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Outline
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Introduction
Functional Description
Block Diagram
Standards
Schedule
Equipment List
Conclusion
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Equipment
• We will use the web train board
• If hardware system works well, we hope to
make PCB
• New microcontroller board if necessary
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Outline
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Introduction
Functional Description
Block Diagram
Standards
Schedule
Equipment List
Conclusion
23
Conclusion
Successful because of
• A/D innovation
• Project can progress with current equipment
• Expandable
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Conclusion
Utility of this Project
• If user sets speed of each engine, why do
we need a system to tell the user where
the engine is?
– Internet has delays—this is local information
– Can be used to implement collision avoidance
– Also needed train decoupling information
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Questions?
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