Patent · US Active

Managing an encoder malfunction in an elevator drive system

US8006808B2 · kind B2 · utility

2Cited by

13References

23Claims

0Family size

Assignee

OTIS ELEVATOR COMPANY · US

Inventors

Edward Piedra · Holyoke, US
Jeffrey M. Izard · Bolton, US
Ismail Agirman · Southington, US

Key dates

Filing date	Jan 30, 2006
Grant date	Aug 30, 2011
Priority date	—
Expiry date	Oct 13, 2027

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB66B1/3492
WIPO fieldHandling
WIPO sectorMechanical engineering

Abstract

An encoder failure in an elevator drive system is detected and managed. A velocity of the elevator drive system is provided by an encoder signal (60) and compared with a minimum velocity threshold (62). An encoder fault timer is incremented when the velocity is less than the minimum velocity threshold (64). The elevator drive system is disabled when the encoder fault timer reaches a fault threshold time (66).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.