Otis Elevator Company

Ronald R Pepin

Sanjay Kamani

Robert H Mashiak

Patrick Lusaka

Theresa M Christy

Chouhwan Moon

Juan A Lence Barreiro

Samuel R Talbot

Harry Z Huang

Gary L Freeland

Joseph Kronen

Jean-Marie Rennetaud

The mean number of elevator door reversals, &mgr;, in groups of related door reversals, and the standard deviation, &sgr;, from the mean, are used to determine the likelihood that door reversals are caused by passenger interference; the likelihood is low if a recent number of reversals exceeds &mgr;&plus;3&sgr;, , is medium if two out of three recent reversals exceed &mgr;&plus;2&sgr;, and otherwise is high. The floors at which related notable elevator features occur are compared to determine a floor factor, F, depending on whether the notable feature occurs only at one floor or at more than one floor. Estimated probabilities, P&prime;(S/C), that any component, C, will result in a symptom, S, (where S&equals;first and second notable features in a related group and the accompanying floor factor, F) are provided by experts; the probability of P&prime;(C) of any failure being of any given component is determined from failure history; and an estimated probability, P&prime;(C/S), that symptom S is caused by component C is given by:

Service information derived from elevator operational parameters

An elevator door reversal monitoring apparatus for monitoring an elevator door system comprises: a plurality of sensors for providing sensor signals; a door reversal state machine for providing door reversal data in response to the sensor signals; an output module for capturing the door reversal data; and an output processing module for determining a current state of the elevator door system in response to the captured door reversal data.

Monitoring of elevator door reversal data

An apparatus and method for providing an elevator door performance result of an elevator door in an elevator door system which normally operates sequentially from state-to-state in a closed loop sequential chain of normal operating states is disclosed. A plurality of parameter signals provided by the elevator door system is monitored by the apparatus. The apparatus comprises: a door state sequencer for providing a performance measure; a module for providing a reference measure and an acceptable range; and an abnormal detection module for analyzing the door performance measure.

Monitoring of elevator door performance

A remote elevator monitoring system includes a master associated with a building and a local connected to the master. The local includes an electronic processor which executes instructions for determining whether the master has transmitted a signal packet to the local within a time period selectable at will by an operator at the local. The time period is, for example, a period selected within a range of 0-255 days. Optionally, for example, the master is programmed to transmit a signal packet to the local at a selected time on the last day of the selected time period.

Remote monitoring system with variable period communication check

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Windsor Locks, CT, United States of America

Ronald R Pepin