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Software In The Loop Applications for VISSIM
TRB Traffic Signal Systems Committee – Simulation Subcommittee
Kiel Ova, P.E., PTOEKiel Ova, P.E., PTOE
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Traffic Signal Controllers
NEMA
> Econolite ASC/2 (now ASC/3)
> Eagle EPAC300 (now M50)
> PEEK LMD 9200
> NAZTEC
Type 170
> Wapiti
> BI Tran Systems
> Caltrans C8
Type 2070
> Siemens Nextphase
> VS-PLUS
Interval
> Peek LMD 40
> Wapiti
SCATS
Fortran Fastracs
… and many more!
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Software-in-the-Loop Controllers
Concept
> Replaces hardware-in-the-loop
> Same logic as firmware
> Virtual time clock and calendar
> Timing parameter database exchange with field controllers
> Commercial signal control firmware interfaces directly with VISSIM’s Signal Controller API
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Software-in-the-Loop Controllers
Motivation
> Error/bias due to improper emulation (TSP, Coordination, etc)
> Faster than real time
> Synchronization
> No hardware required
Disadvantages
> More communication overhead than VISSIM’s embedded controller
> No data exchange with other controllers (future NTCIP compliant)
> No import from signal optimization tools (future development)
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VISSIM’s SIL Applications
Available SIL controllers:
> NEMA Controller (PTV)
> Fourth Dimension D4
> VS-PLUS
> SCATS
> Econolite ASC/3
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Fourth Dimension D4
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Econolite ASC/3 Controller
> 16 Phases/16 Overlaps
> 16 Ped Phases/16 Ped Overlaps
> 4 Rings
> 64 Detectors
> Phase Compatibility Matrix
> Logic Processors – Emulate External Logic/PLC
> Coordination/Preempt
> NTCIP 1202 Compliance
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ASC/3 SIL Controller – Database Editor
> icons™
> .db is transferred between VISSIM and ASC/3 controller (hardware) via NTCIP Database Manager
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ASC/3 SIL Controller – Front Panel Display
> ASC/3 Menu Structure
> Online Controller Status
> Detector Status
> Real-time Database Update
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ASC/3 SIL Controller – Logic Processing
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ASC/3 SIL Controller – I/O Mapping
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Summary
Current Status:
> Ready for field application
Future Work:
> ASC/3 Transit Signal Priority Implementation
> GA Based optimization of signal timing parameters
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