Monitoring of elevator door performance

• US 5,760,350 A
• Filed: 10/25/1996
• Issued: 06/02/1998
• Est. Priority Date: 10/25/1996
• Status: Expired due to Term

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Lusaka, Patrick, Rennetaud, Jean-Marie, Mashiak, Robert, Pepin, Ronald R., Kamani, Sanjay
• Primary Examiner(s): NAPPI, ROBERT E
• Application Number:
  US08/738,667
• Time in Patent Office: 585 Days
• Field of Search: 187/316, 187/391, 187/393
• US Class Current: 187/316
• CPC Class Codes: B66B 13/143 electrical

Abstract

An apparatus and method for providing an elevator door performance result of an elevator door in an elevator door system which normally operates sequentially from state-to-state in a closed loop sequential chain of normal operating states is disclosed. A plurality of parameter signals provided by the elevator door system is monitored by the apparatus. The apparatus comprises: a door state sequencer for providing a performance measure; a module for providing a reference measure and an acceptable range; and an abnormal detection module for analyzing the door performance measure.

Claims

1. A method for providing an elevator door performance result of an elevator door in an elevator system, said method comprising the steps of:

determining a reference measure for the elevator door;

determining an acceptable range for a performance measure in response to the reference measure;

providing the performance measure from a door state machine which monitors a plurality of parameter signals provided by the elevator door system, the door state machine following a sequence of elevator door operations;

determining if the performance measure is within the acceptable range; and

providing a performance result by averaging the performance measure with the reference measure if the performance measure is within the acceptable range, wherein the performance measure is not considered in providing the performance result if the performance measure is not within the acceptable range.

2. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 1 wherein the performance result is determined in accordance with the following:

##EQU4## wherein t is the present time, t-1 is the time of previous evaluation,

X_t is the performance measure,

A_t is the performance result, and

n is the number of values in the average.

3. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 2 wherein the number of values in the average ranges from one to twenty.

4. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 1 wherein the acceptable range is determined in accordance with the following:

##EQU5## wherein t is the present time,

t-1 is the time of previous evaluation,

X_t is the performance measure,

A_t is the performance result,

StD_t is the standard deviation,

G is a gain factor, and

n is the number of values in the average.

5. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 4 wherein the number of values in the average ranges from one to twenty.

6. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 1 further comprising the step of:

providing an updated acceptable range in response to the average of the performance measure and the reference measure.

7. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 6 wherein each step is repeated a determined number of iterations so as to further refine the performance result.

8. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 7 wherein if a number of occurrences of the performance measure not being in the acceptable range is greater than a determined number then the acceptable range is increased by a determined percentage.

9. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 8 wherein the determined number is fifth percent of the determined number of iterations.

10. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 8 wherein the determined percentage is ten percent.

11. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 7 wherein the determined number of iterations is 50.

12. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 1 wherein the performance measure is a door interlock interval.

13. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 1 wherein the performance measure is a door open interval.

14. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 1 wherein the performance measure is a door dwell interval.

15. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 1 wherein the performance measure is a door start to close interval.

16. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 1 wherein the performance measure is a door close interval.

17. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 1 wherein the parameter signals monitored by the door state machine comprise a door open command signal and a door switch signal.

18. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 17 wherein the parameter signals monitored by the door state machine further comprise a door open limit signal.

19. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 18 wherein the parameter signals monitored by the door state machine further comprise a door close command signal.

20. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 1 wherein the performance result is communicated from a building in which the elevator system resides to a monitoring center for determining degradation in the performance result.

21. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system which normally operates sequentially from state-to-state in a closed loop sequential chain of normal operating states, said apparatus monitoring a plurality of parameter signals provided by the elevator door system, said apparatus comprising:

a door state sequencer for providing a performance measure in response to a plurality of parameter signals provided by the elevator door system;

a module for providing a reference measure and an acceptable range for the door performance measure in response to the sequential chain of normal door operating states; and

an abnormal detection module for analyzing the door performance measure such that if the door performance measure is within the acceptable range a performance result is provided by averaging the performance measure with the reference measure.

22. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 21 wherein the acceptable range is updated in response to the performance result.

23. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 21 wherein if the door performance measure is not within the acceptable range, the door performance measure is ignored.

24. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 21 wherein the performance result is determined in accordance with the following:

##EQU6## wherein t is the present time,

t-1 is the time of previous evaluation,

X_t is the performance measure,

A_t is the performance result, and

n is the number of values in the average.

25. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 24 wherein the number of values in the average ranges from one to twenty.

26. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 21 wherein the acceptable range is determined in accordance with the following:

##EQU7## wherein t is the present time,

t-1 is the time of previous evaluation,

X_t is the performance measure,

A_t is the performance result,

StD_t is the standard deviation,

G is a gain factor, and

n is the number of values in the average.

27. A method for providing an elevator door performance result of an elevator door in an elevator system as recited in claim 26 wherein the number of values in the average ranges from one to twenty.

28. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 21 wherein the performance measure is a door interlock interval.

29. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 21 wherein the performance measure is a door open interval.

30. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 21 wherein the performance measure is a door dwell interval.

31. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 21 wherein the performance measure is a door start to close interval.

32. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 21 wherein the performance measure is a door close interval.

33. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 21 wherein the parameter signals monitored by the door state sequencer comprise a door open command signal and a door switch signal.

34. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 33 wherein the parameter signals monitored by the door state sequencer further comprise a door open limit signal.

35. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 34 wherein the parameter signals monitored by the door state sequencer further comprise a door close command signal.

36. An apparatus for providing an elevator door performance result of an elevator door in an elevator door system as recited in claim 21 wherein the performance result is communicated from a building in which the elevator system resides to a monitoring center for determining degradation in the performance result.