Traffic control malfunction management unit with co-channel monitoring
US7109886B2 · kind B2 · utility
0Cited by
4References
12Claims
0Family size
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Key dates
| Filing date | Nov 20, 2003 |
| Grant date | Sep 19, 2006 |
| Priority date | — |
| Expiry date | Jan 20, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/097
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and apparatus for monitoring for Red Fail faults in a traffic signal control system. Traffic control signals generated by a traffic control unit are grouped into channels. A parent-child relationship is established between some channels. When testing for a Red Fail fault, the control signals in both the parent channel and the child channel are examined. A Red Fail fault will occur only if all the control signals examined in both the parent and the child channel are inactive. The control signals examined in the child channel can be limited to the Green and Walk signals; or may include the Yellow signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.