Westinghouse Electric Corporation

William H Moore

William J Trosky

Alan F Mandel

Kenneth M Eichler

Charles M Gutowski

Edward Tober

Thomas A Vasold

Stephen P Tomas

Thomas A Butler

A method of monitoring an operating elevator system for malfunctions related to sequentially perform functions, including the detection of both sequence and timing errors. The method monitors predetermined signals for the detection of user defined unique events starting and stopping conditions, and it follows each state change of all of the pertinent signals which occurs between these two detected conditions. The state changes and their occurrence times relative to the start of the detected event, are compared with a learned binary image of the correct state changes and occurrence times, which correct image was prepared and stored during a learn mode when the elevator was known to correctly perform the sequence to be monitored.

Method of monitoring an elevator system

A method of integrating an expert system having a knowledge base of elevator trouble-shooting information into the working environment of elevator service personnel, without special training of such personnel, and without compromising the security of the knowledge base. The method includes an interactive initialization procedure which includes successive, successful user and knowledge base initiated communication links between the user and knowledge base, before actual access to the knowledge base is permitted.

Methods of servicing an elevator system

An elevator system which includes a plurality of lamps, each associated with a different floor number of an associated building. Lamp burn-out is detected via a single current sensor disposed in the common return of the lamps, along with logic which indicates when a test should be made, and which lamp is being tested. Detection of a burned-out lamp is stored for maintenance purposes.

Elevator system with lamp failure monitoring

Apparatus and methods for correcting a software clock remote from an accurate clock, which include determining the error between the remote software clock and accurate clock, and in addition to periodically downloading the correct time to the software clock, a correction factor is also downloaded which attempts to correct the error.

Methods and apparatus for correcting a software clock from an accurate

Methods and apparatus for improving the servicing of an elevator system based upon the actual usage of its many functions. The usage of predetermined elevator system functions is monitored and data is collected relative thereto. Threshold and limit parameters are provided for the monitored functions, which parameters are periodically compared with the usage data. The reaching of a usage threshold parameter by a monitored function results in predetermined associated maintenance services being added to a maintenance due list. When a monitored function reaches its associated limit parameter, a need for scheduled elevator preventive maintenance is indicated for all of the maintenance services on the maintenance due list.

Method and apparatus for improving the servicing of an elevator system

Elevator servicing methods and apparatus which detect and store information relative to user-defined intermittent conditions, or other abnormal operating conditions. The stored information is reproduced for evaluation and analysis in a manner selected by the user, such as on a video monitor and/or a printer.

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Bridgewater, NJ, United States of America

William H Moore