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1. (WO2018178023) ELEVATOR CAR LOAD MEASUREMENT SYSTEM AND METHOD FOR DETERMINING A LOAD OF AN ELEVATOR CAR

Pub. No.:    WO/2018/178023    International Application No.:    PCT/EP2018/057663
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Tue Mar 27 01:59:59 CEST 2018
IPC: B66B 1/34
B66B 5/14
Applicants: INVENTIO AG
Inventors: ROUSSEL, Frank Olivier
SIMMONDS, Oliver
Title: ELEVATOR CAR LOAD MEASUREMENT SYSTEM AND METHOD FOR DETERMINING A LOAD OF AN ELEVATOR CAR
Abstract:
An elevator car load measurement system (10) for determining a load of an elevator car (12) is proposed, wherein the elevator car load measurement system (10) comprises: a plurality of at least two force sensors (40, 42, 44, 46) which are daisy-chained, and a controller (58) for determining the load of the elevator car (12), wherein each force sensor (40, 42, 44, 46) is adapted for measuring a force exerted by the elevator car (12) on the respective force sensor (40, 42, 44, 46) and for generating a frequency signal with a square-wave form, wherein the frequency signal is proportional to the respective measured force, wherein at least one first force sensor (40, 42, 44, 46) of the plurality of force sensors is adapted such that a first frequency signal (80) received from the previous force sensor (40, 42, 44, 46) along the daisy chain is added to a second frequency signal (82) generated by the first force sensor (40, 42, 44, 46) for generating and outputting a frequency sum signal (84), and wherein at least one force sensor (40, 42, 44, 46) of the at least one first force sensor is adapted for forwarding the frequency sum signal (84) to the controller (58).