Elevator car door and motion sequence monitoring apparatus and m

Details Elevator car door and motion sequence monitoring apparatus and m Elevator car door and motion sequence monitoring apparatus and m

1987-07-10

1988-06-14

Shoop, Jr., William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187133, B66B 300

Patent

active

047505915

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.

REFERENCES:
patent: 4367810 (1983-01-01), Doane et al.
patent: 4418795 (1983-12-01), Trosky et al.
patent: 4512442 (1985-04-01), Moore et al.
patent: 4568909 (1986-02-01), Whynacht
patent: 4622538 (1986-11-01), Whynacht et al.
patent: 4681190 (1987-07-01), Toshiaki
patent: 4698780 (1987-10-01), Mandel et al.

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