ELEVATOR CAR DOOR AND MOTION SEQUENCE MONITORING APPARATUS AND METHOD

摘要

An elevator monitoring apparatus and method are disclosed in which an elevator is modelled as operating in a closed loop chain of normal operating states from which message initiating transitions to abnormal states cause the latest to occur of a selected number of monitored events to be recovered from a storage buffer 24 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.