Transcript System for Engine Location Of a Web Train

System for Engine Location Of
a Web Train
Paul Wimmer and Adam Weintrop
Dr. Irwin and Dr. Schertz
2/20/06
Outline
• Current position on time line
• Accomplishments of last week
• Goals for next week
2
Time Line
3
Outline
• Current position on time line
• Accomplishments of last week
• Goals for next week
4
Last Week
• Recoded all DCC generation software
– Much more efficient and useful
– 3 Tier Menu:
• Select Train (Blue/White)
• Select Direction (Foreword/Backward)
• Select Speed (0-9)
– Problems with White Train
• Tested the new transformers
• Organized software program flow
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Results
The results of the transformer circuit
(200 turn sensor and 1 MOhm terminating resistor)
-With Train off track ~30 mV
-With Train idle on track ~130 mV
-With Train running ~upwards of 1 V
Could use resistor in engine to increase off / idle voltage range
-May not be necessary with 100mV difference
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Program Flow
• 7 Primary modules/functions
– Main
– Compare positions
– Dx
– Dt
– Velocity
– Basic Collision Avoidance?
– Relay to PC?
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Main
• Change MUX inputs
• Test each MUX ouptut
– Determine if the train is on a given section of
track
• Code is written, not done troubleshooting
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Compare
• Compares the new position to the previous
position
• Further action is only taken if the position
has changed
• No relevant info if position is the same
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Dx
• Distance traveled by the train
• Based on:
– New track section
– Old track section
– Direction (when necessary)
– Table? Set of loops and if statements?
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Dt
• Determine the time that the train took to
cross the last track section
– Stop a timer upon entrance of a section
– Extract the values
– Start up the next timer
• A certain amount of overflow = idle train
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Speed
• Dx/Dt determined in C in floating point
• Conversion to an 8 bit integer (char)
• An averaging algorithm may be
implemented (time permitting)
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Collision Avoidance
• If a train is approaching another:
– Send out an e-stop (if on same processor as
the DCC signal)
– Warn user (if a GUI is setup in Java)
– Kill the power --> the most practical method
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Back to PC
• Time permitting:
– Transfer values from EMAC to PC
– Create a GUI in JAVA
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Outline
• Current position on time line
• Accomplishments of last week
• Goals for next week
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Problems to Address for Next Week
• Finish hardware (comparators, multiplexers)
• Interface with software
• Test hardware and software I/O
• Write more independent software functions
– Divide them up between us
• Latch or Sample and Hold hardware?
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