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Webtrain Decoupling Adam Kadolph EE451/452 Bradley University Advisors: Dr. Irwin, Dr. Schertz Final Presentation
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2 Outline Introduction –Project Goal –Background Automatic Decoupling System –Train Control –Coupling and Decoupling –Sensor –Decoupling Process Recap Questions
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3 Introduction Project – Automatic Decoupling System The Train – N Gauge Scale Model train –The scaling ratio is 1:160 Uses for System –Direct –Indirect
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4 Background Last year – Train control System and location detection The Microcontroller to send DCC Signals
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5 Train Layout 1.Main Track 2.Bypass Track 3.Switches
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6 Automatic Decoupling System Starting the system –Train Control –Coupling –Sensors
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7 Automatic Decoupling System DCC Signals –Receiver boards in locomotive –A packet of data consisting of 42 bits Preamble Address Byte Data Byte Error Byte –Transition bits are rectified for power
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8 Automatic Decoupling System Coupling and Decoupling –Decoupling Magnet –Train couplers –Relieving coupler tension →→
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9 Automatic Decoupling System Manual Decoupling –Program to remove train cars via simple controls from a Microcontroller –Train response time –Coupler effectiveness
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10 Automatic Decoupling System Sensors –Location for Sensor –Detection Angle –Dimensions Types to use Phototransistor Optointerrupter Photocell
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11 Automatic Decoupling System Using the Photocell –4x Photocells used –Mounting Location –Microcontroller interface
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12 Automatic Decoupling System Train Detection –Test track –Voltages Ranges become Detection States Ambient or Nothing State Coupler StateTrain State →→
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13 Automatic Decoupling System Sensor Programs –Read 1x sensor –Read 4x sensors –Sensor for train control Calibration Program –“Smarter” System
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14 Automatic Decoupling System Decoupling Process –Stage 1 – Remove cars after –Stage 2 – Remove desired car –Stage 3 – Couple remaining cars →
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15 Automatic Decoupling System Stage 1 of Decoupling Process –Train approaches sensor –Sensor detects train –Train stops over decoupler –Train moves on past switch →→
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16 Automatic Decoupling System Stage 2 of Decoupling Process –Train reverses –Sensor detects train –Train stops over decoupler –Train moves on past switch → →
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17 Automatic Decoupling System Stage 3 of Decoupling Process –Train reverses –Sensor detects train –Train moves some distance –Remaining cars are coupled → →
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18 Automatic Decoupling System Decoupling Process altogether –Stage 1 and Stage 2 and Stage 3 –Switch separates stages –Key press to resume Timing issues for Stage 2 and 3 –FPGA for DCC signal generation
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19 Recap Key Points –Train Control –Coupling and Decoupling –Sensors –Putting it altogether
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20 Questions? The End
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21 Appendix A DCC Signals –Preamble – 14 bits –Address, Data, Error – 8 bits each –‘1’ bit – 60 us low and 60 us high –‘0’ bit – 120 us low and 120 us high 11111111111111 0 0AAAAAAA 0 01DCSSSS 0 EEEEEEEE 1
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22 Appendix B Detection State Voltages –Nothing or Ambient State 0.0 V to 0.9V and 1.6 V to 3.0 V –Train State 3 V to 5 V –Coupler State 0.9 V to 1.6 V Sensor offset voltages BL – 0.70 V BR – 0.48 V ML – 0.63 V MR – 0.67 V
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23 Appendix C Adding an FPGA to the System –Why? –FPGA board –Train control with VHDL
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