System for Engine Location of the WebTrain

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System for Engine Location of the WebTrain

• Adam Weintrop and Paul Wimmer
• Advisors
• Dr. Irwin and Dr. Schertz

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Engine Location

• Where is the train?
• Local information to control collisions,
  decoupling

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Outline

• Summary
• Schedule
• Functional Description
• Block Diagram
• Goals for end of project

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Project Summary

• Had to recreate train command control system
• Using current sensing train location can be
  determined quickly
• Microprocessor can control train functions using
  location information

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Train Control System

• 3 Level Menu
• Train Choice
• Speed Choice
• Using 10 different speeds to test full range
• Direction Choice
• Forwards / Backwards
• Sends command then long zeroes

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Outline

• Summary
• Schedule
• Functional Description
• Block Diagram
• Goals for end of project

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Schedule
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Schedule
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Outline

• Summary
• Schedule
• Functional Description
• Block Diagram
• Goals for end of project

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Overall System
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The 2-bit Method

• Three train states are significant in this
  project
• Software can determine average speed
• 0 0 - Train is off that section
• 0 1 - Train is on stopped at the section
• 1 1 - Train is running on that section

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Outline

• Summary
• Schedule
• Functional Description
• Block Diagram
• Goals for end of project

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Block Diagram
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Schematic
0.5 V
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Outputs of Hardware
OFF TRACK
High is gt4.35V Low is lt40 mV
IDLE
RUN
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Multiplexing

• 3 - 16 to 4 multiplexer
• With different chip enable pins on each
  multiplexer
• Select lines are the same for all chips
• Can fill a nibble of track location data(2
  sections or individually selected)
• All outputs are ORd together to combine to have
  4 total outputs at one time
• This can free up several I/O lines to the
  microprocessor

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Software

• Using C code on 80535
• Want to take information of train status and
  location and process
• Output where train is, status, and implement
  warnings of collision
• First step to more advanced software

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Flow Chart
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Outline

• Summary
• Schedule
• Functional Description
• Block Diagram
• Goals for end of project

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Plan for Rest of Semester

• LED board to show train location and status
• We will have completed the software in 1 week and
  the rest of the semester will be devoted to
  testing

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Conclusion

• With hardware built and software designed, engine
  location system is near completion
• Questions?

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Questions? We have answers

• A/D method?
• Need precise A/D
• Analog multiplexing
• But a train with a heavy load could look like a
  faster train

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More Answers

• Nonlinear amplifier?
• More complex than necessary
• Can be substituted for high gain amplifier in
  current system

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Other Scope Plots
Idle on track after amplifier
Idle on track after rectifier / filter 1 V
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Other Scope Plots
Running after amplifier
Running after rectifier / filter Still variation
,but always above 7V -does not damage
comparator -lower filter cutoff increases
response time