Adapting escalator speed to traffic using fuzzy logic
US5564550A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1994 |
| Grant date | Oct 15, 1996 |
| Priority date | — |
| Expiry date | Sep 20, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S706/90
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
In one embodiment, fuzzy sets indicative of the degree to which the time since the last passenger boarded an escalator can be deemed to be zero, a very long time, or something in between, are combined with fuzzy sets indicative of the extent to which the maximum number of passengers in a recent temporal or cyclic period can be deemed to be a zero passenger, a very large group, or something in between. In another embodiment, fuzzy sets indicative of the degree to which the time since the last passenger exited an empty escalator can be deemed to be nearly zero, a very long time, or something in between, are combined with fuzzy sets indicative of the degree to which the maximum group of passengers on the escalator at any time since the last time it was empty can be deemed to be a single passenger, a very large group, or something in between. T-norms (functions for combining the pair of fuzzy sets) are used to select recommended target speeds; weighted averaging of more than one recommended target speed is used to defuzzify the result to achieve an ultimate target speed, except in the second embodiment, which tailors the speed of the escalator to the current traffic level where the tar…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.