Absolute Position Door Zone Device

摘要

An elevator moves through a hoistway with one or more sensors positioned so that they pass by one or more targets that are in fixed positions relative to the hoistway. As they pass, an inductive current is generated, giving the elevator's control circuitry precise information as to the vertical position of the elevator car. The control system adjusts the raising and/or lowering of the elevator car based on that position information and any discrepancy between it and the supposed position at which the control system had believed the car was. Discrepancies are accumulated over time as an indication of cable stretch, and when the stretch exceeds a particular threshold, an alarm is raised for maintenance. The control system also defines a “door zone” around each landing where, based on the precise height measurement achieved herein, it is safe under the circumstances to open the doors of the car.

主权项

1. An elevator system, comprising:
a hoistway having two or more landings; a metal target in the hoistway; a car situated within the hoistway; a lift mechanism that moves the car substantially vertically through the hoistway among the landings; a control system that controls the lift mechanism; and a first inductive sensor that moves with the car, the first inductive sensor sending a first position signal to the control system based on the position of the first inductive sensor relative to the target; wherein the control system controls the lift mechanism based on the first position signal.