1 / 16

Real Time Systems: Train Gate System II

Real Time Systems: Train Gate System II. Chieu Wang Vincent Ng. Current System. A unidirectional railway track that crosses a one way road. A single gate at the crossing which may be lowered or raised under the control of a computer.

jorn
Download Presentation

Real Time Systems: Train Gate System II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Real Time Systems:Train Gate System II Chieu Wang Vincent Ng

  2. Current System • A unidirectional railway track that crosses a one way road. • A single gate at the crossing which may be lowered or raised under the control of a computer. • There are two sensors present to detect incoming and outgoing trains.

  3. Current System Entry Sensor Exit Sensor Gate

  4. Processes • Se – represents the entry sensor. • Sl – represents the exit sensor. • G – represents the gate. • M – the monitor that keeps track of the number of trains in the area. • C – controls the gate.

  5. Se Sl G C Train Gate CRSM Communication Diagram tr trout trin gok og cg M cont_og cont_cg

  6. Proposed Modifications • Change to a two track unidirectional railway that crosses over a two way road. • Model will include two gates at the crossing which may be lowered or raised that is under the control of a computer.

  7. Proposed Modifications, Con’t • There will be four sensors in the system: • Two sensors for each track to detect incoming and outgoing trains.

  8. Train Gate System II Entry Sensor 2 Gate 2 Exit Sensor 2 Entry Sensor Gate 1 Exit Sensor

  9. Details of Proposed Modifications • Se2 – represents the entry sensor on second track. • Sl2 – represents the exit sensor on second track. • G2 – represents the second gate.

  10. SE2 SE1 SL1 G1 M C SL2 G2 Train Gate II CRSM Communication Diagram tr gok trin tr 2 trout og cg trin 2 cont_og2 cont_cg2 cg 2 og2 cont_og trout 2 cont_cg gok2

  11. Train Sensore Monitor Controller Gate Sensorl Sensore1 Sensore2 Sensorl1 Sensorl2 Gate1 Gate2 Recommended Implementation and Modeling

  12. Train SE1 SE2 M C G1 G2 SL1 SL2 Simplified Modeling Version

  13. Advantages • Existing classes does not need to be modified. • ie. sensore.java, sensorl.java, gate.java • Existing classes are easily cloned for reuse. • Existing timing constraints can be applied to the new classes.

  14. Disadvantages • The monitor and controller process require substantial modifications to handle the new classes. • Issues with sequence of processing.

  15. Difficulties Encountered • The monitor and controller class required major overhaul to accommodate multiple events that may occur at the same time.

  16. Conclusion • The modified system will provide a more realistic model of a train gate system. • By incorporating multiple tracks and sensors, the model will further reinforce the basic concepts of concurrency and synchronization among processes

More Related