Elevator car door and motion sequence monitoring apparatus and method
US4750591A · kind A · utility
60Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1987 |
| Grant date | Jun 14, 1988 |
| Priority date | — |
| Expiry date | Jul 10, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B25/02
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An elevator monitoring apparatus and method are disclosed in which an elevator is modeled as operating in a closed loop chain of normal operating states from which message initiating transitions to abnormal states causes the latest to occur of a selected number of monitored events are recovered from a storage buffer as an aid to an analysis of an abnormal state. Door and motion closed loop chain state machines are disclosed as effective tools for abnormal event detection, especially for a state machine approach implemented within an elevator controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.