Patent
Two-channel forked light barrier detecting vertical position
TLDR
In this paper, a two-channel forked fail-safe light barrier generates shaft position information in the region of the floors for premature opening of the doors on arrival of an elevator car and includes a cyclical dynamic self-monitoring circuit by means of which a prophylactic fault recognition is possible.Abstract:
A two-channel forked fail-safe light barrier generates shaft position information in the region of the floors for the premature opening of the doors on arrival of an elevator car and includes a cyclical dynamic self-monitoring circuit by means of which a prophylactic fault recognition is possible. The self-monitoring circuit is responsive to the arrival and standstill of the car at a floor and periodically simulates genuine operational sequences as a brief emergence of the switching vane by an optical short-circuit of the fail-safe light barrier. The simulation effects interruption of the light barrier relay power which is, however, shorter than the release time of the relays so that the relays do not release when the circuit is intact. A sequence of timing signals controls the sequence of the self-monitoring functions and, in the case of any kind of component faults, this sequence is disturbed and a corresponding reaction in the safety circuits of the elevator control takes place by way of the relay contacts. A cyclically appearing test signal is generated as the primary control signal for the simulated interruptions.read more
Citations
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Patent
Method for monitoring elevator leveling performance with improved accuracy
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Patent
Device for monitoring a control unit.
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Flow-control valve
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Method and system for communicating with a controller of an elevator
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References
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Patent
Elevator self-diagnostic control system
Bradley W. Manske,John M. Weber +1 more
TL;DR: In this paper, an elevator self-diagnostic system monitors the operative status of various elevator components and upon sensing an error initiates action to bring the elevator car to a safe operating state.
Patent
Elevator system leveling safeguard control and method
TL;DR: In this article, an elevator control system with a local area network on the traveling cable and distributed control circuit safeguard for loss of remote microprocessor control with a car door open when floor releveling distance exceeds the landing zone limit.
Patent
Fail-safe detector
Winkler C,Zitelli W +1 more
TL;DR: A fail-safe position detector in which a pulsed light source induces corresponding electrical pulses in a light responsive receiver circuit when the components are in a desired relative position is described in this paper.
Patent
Discrete position location sensor
TL;DR: In this article, a discrete position encoder includes a plurality of detectors arranged along a direction of motion or relative position between two objects, which are rendered responsive in either of two states by another member which is relatively movable with respect to a vane.
Patent
Apparatus and method for detecting elevator car position in a door zone
Hansjörg Arnosti,Hans Bussmann +1 more
TL;DR: In this article, a method and apparatus for the generation of elevator car position information in an elevator shaft includes a safety light barrier mounted on the car and actuating vanes in the shaft cooperating with a safety circuit for connecting the door and lock contacts to a source of electrical power in the door zone of a destination floor.