System for Engine Location of the WebTrain Adam Weintrop and Paul Wimmer Advisors Dr. Irwin and Dr. Schertz

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3 Engine Location Where is the train? Local information to control collisions, decoupling…

4 Outline Summary Schedule Functional Description Block Diagram Goals for end of project

5 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

6 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”

7 Outline Summary Schedule Functional Description Block Diagram Goals for end of project

8 Schedule

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10 Outline Summary Schedule Functional Description Block Diagram Goals for end of project

11 Overall System

12 The “2-bit” Method Three train states are significant in this project  Software can determine average speed Train is off that section Train is on stopped at the section Train is running on that section

13 Outline Summary Schedule Functional Description Block Diagram Goals for end of project

14 Block Diagram

15 Schematic ~0.5 V

16 Outputs of Hardware OFF TRACK RUN IDLE High is >4.35V Low is <40 mV

17 Multiplexing 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 OR’d together to combine to have 4 total outputs at one time This can free up several I/O lines to the microprocessor

18 Software Using C code on 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

19 Flow Chart

20 Outline Summary Schedule Functional Description Block Diagram Goals for end of project

21 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

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

23 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

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

25 Other Scope Plots Idle on track after amplifier Idle on track after rectifier / filter ~1 V

26 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