Healthcheck of Door Obstruction Device

• US 20120325588A1
• Filed: 07/17/2009
• Published: 12/27/2012
• Est. Priority Date: 07/17/2009
• Status: Active Grant

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Loeb, Ruediger, Herkel, Peter
• Granted Patent: US 9,120,646 B2
• Time in Patent Office: Days
• US Class Current: 187/247
• CPC Class Codes: B66B 13/143 electrical
• CPC Class Codes: B66B 13/26 between closing doors

Abstract

Automatic door systems and methods capable of determining proper functionality thereof are provided. The door systems are provided with a healthcheck module which automatically determines functionality of the door system by initially monitoring a first output signal provided by a first sensor and a second output signal provided by a second sensor. More specifically, the healthcheck module correlates the first output signal with the second output signal and operates one or more doors of a door system according to the correlation. The healthcheck module then monitors the second output signal provided by the second sensor to determine the ability of the one or more doors to close, and determines functionality of the door system accordingly.

Claims

1. A method for determining functionality of an automatically closing door system, comprising the steps of:

monitoring an obstruction signal output by a first sensor configured to detect an obstruction in a pathway of a door of the door system, the obstruction signal corresponding to one of at least three states including a normal state, a first abnormal state and a second abnormal state;

closing the door at a first speed if the obstruction signal corresponds to the normal state;

closing the door at a second speed if the obstruction signal corresponds to any one of the first and second abnormal states, the second speed being slower than the first speed;

monitoring a door position signal output by a second sensor configured to detect a current position of the door, the door position signal corresponding to one of at least three states including a closed state, an open state and a blocked state; and

declaring the door system as malfunctioning if the obstruction signal corresponds to the first abnormal state and the door position signal corresponds to the closed state, or the obstruction signal corresponds to the second abnormal state and the door position signal corresponds to the blocked state.

2. The method of claim 1 further comprising a step of declaring the door system as functional if the obstruction signal corresponds to the normal state, the obstruction signal corresponds to the first abnormal state and the door position signal corresponds to the blocked state, or the obstruction signal corresponds to the second abnormal state and the door position signal corresponds to the closed state.

3. The method of claim 1 further comprising a step of triggering an alert to call attention to the door system if the door system is determined to be malfunctioning.

4. The method of claim 1, wherein the normal state corresponds to a toggle in the obstruction signal, the first abnormal state corresponds to a consistently active obstruction signal, and the second abnormal state corresponds to a consistently inactive obstruction signal.

5. The method of claim 1, wherein, during the first abnormal state, the door system is closed at the second speed only after a predetermined time has elapsed.

6. The method of claim 1, wherein, during the second abnormal state, the door system is closed at the second speed only after a counter exceeds a predetermined limit, the counter configured to increment only when the obstruction signal corresponds to the second abnormal state.

7. An automatic door system capable of determining proper functionality thereof, comprising:

at least one door automatically movable along a pathway of the door system (10, 10a);

at least one obstruction sensor configured to detect an obstruction in the pathway and output an obstruction signal;

at least one position sensor configured to detect a position of the door along the pathway and output a position signal;

a control unit configured to receive the obstruction and position signals and output command signals;

a drive unit configured to receive the command signals from the control unit and drive the door; and

a healthcheck module configured to;

monitor a correlation between the obstruction and position signals;

determine if the door system is malfunctioning based on the correlation; and

call attention to the door system if the door system is malfunctioning.

8. The automatic door system of claim 7, wherein the obstruction sensor comprises at least one emitter and at least one receiver, the emitter configured to emit radiation across the pathway to be received by the receiver, the obstruction signal corresponding to the amount of radiation that is received at the receiver.

9. The automatic door system of claim 7, wherein the healthcheck module is configured to classify the obstruction signal as one of at least three states including a normal state, a first abnormal state and a second abnormal state, and wherein the door system is configured close the at least one door at a first speed if the obstruction signal corresponds to the normal state, close the at least one door at a second speed if the obstruction signal corresponds to any one of the first and second abnormal states, the second speed being slower than the first speed.

10. The automatic door system of claim 9, wherein the healthcheck module is configured to classify the door position signal as one of at least three states including a closed state, an open state and a blocked state, and declare the door system as malfunctioning if the obstruction signal corresponds to the first abnormal state and the door position signal corresponds to the closed state, or the obstruction signal corresponds to the second abnormal state and the door position signal corresponds to the blocked state.

11. The automatic door system of claim 9, wherein the normal state corresponds to a toggle in the obstruction signal, the first abnormal state corresponds to a consistently active obstruction signal, and the second abnormal state corresponds to a consistently inactive obstruction signal.

12. The automatic door system of claim 9, wherein, during the first abnormal state, the door system is closed at the second speed only after a predetermined time has elapsed.

13. The automatic door system of claim 9, wherein, during the second abnormal state, the door system is closed at the second speed only after a counter exceeds a predetermined limit, the counter configured to increment only when the obstruction signal corresponds to the second abnormal state.

14. The automatic door system of claim 7, wherein the healthcheck module is configured to trigger an alert to call attention to the door system if the door system is determined to be malfunctioning.

15. The automatic door system of claim 7, wherein the at least one door is disposed in an elevator car.

16. An elevator system comprising:

a hoistway having one or more hoistway doors;

a car configured to move vertically within the hoistway, the car having a door system, the door system being capable of determining proper functionality thereof, the door system comprising;

at least one door automatically movable along a pathway of the door system;

at least one obstruction sensor configured to detect an obstruction in the pathway and output an obstruction signal;

at least one position sensor configured to detect a position of the door along the pathway and output a position signal;

a control unit configured to receive the obstruction and position signals and output command signals;

a drive unit configured to receive the command signals from the control unit (16, 16a) and drive the elevator door; and

a healthcheck module configured to;

monitor a correlation between the obstruction and position signals;

determine if the door system is malfunctioning based on the correlation; and

output a notification signal to a notification system to call attention to the door system if the elevator door system is malfunctioning.

17. The elevator system of claim 16, wherein the obstruction sensor comprises at least one emitter and at least one receiver, the emitter configured to emit radiation across the pathway to be received by the receiver, the obstruction signal corresponding to the amount of radiation that is received at the receiver.

18. The elevator system of claim 16, wherein the healthcheck module is configured to classify the obstruction signal as one of at least three states including a normal state, a first abnormal state and a second abnormal state, and wherein the door system is configured to close the at least one door at a first speed if the obstruction signal corresponds to the normal state, close the at least one door at a second speed if the obstruction signal corresponds to any one of the first and second abnormal states, the second speed being slower than the first speed.

19. The elevator system of claim 18, wherein the healthcheck module is configured to classify the elevator door position signal as one of at least three states including a closed state, an open state and a blocked state, and declare the door system as malfunctioning if the obstruction signal corresponds to the first abnormal state and the door position signal corresponds to the closed state, or the obstruction signal corresponds to the second abnormal state and the door position signal corresponds to the blocked state.

20. The elevator system of claim 18, wherein the normal state corresponds to a toggle in the obstruction signal, the first abnormal state corresponds to a consistently active obstruction signal, and the second abnormal corresponds to a consistently inactive obstruction signal.

21. The elevator system of claim 18, wherein, during the first abnormal state, the door system is closed at the second speed only after a predetermined time has elapsed.

22. The elevator system of claim 18, wherein, during the second abnormal state, the door system is closed at the second speed only after a counter exceeds a predetermined limit, the counter configured to increment only when the obstruction signal corresponds to the second abnormal state.

23. The elevator system of claim 16, wherein the notification system includes a server and at least one user-interface.