A system determines the position of an elevator car movable in an elevator installation shaft. A transmitter emits modulated electromagnetic radiation with a first modulation frequency as a first output signal, a sensor cell receives electromagnetic radiation reflected by a detected object as an original measurement signal, and an evaluation unit, communicating with the transmitter and the sensor cell, delays the original measurement signal thus generating a delayed measurement signal, determines a first phase offset between the original measurement signal and the first output signal, determines a second phase offset between the delayed measurement signal and the first output signal, selects either the first phase offset or the second phase offset based upon a selection condition to determine a position of the elevator car within a portion of the elevator shaft, and determines the elevator car position based upon the elevator shaft portion and the position within the portion.
SYSTEM AND METHOD FOR DETERMINING THE POSITION OF AN ELEVATOR CAR OF AN ELEVATOR INSTALLATION, SAID ELEVATOR CAR BEING MOVABLY ARRANGED IN AN ELEVATOR SHAFT
2025-01-30
Patent
Electronic Resource
English
European Patent Office | 2025
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