Elevator behavior reported in occurrence-related groups

• US 6,330,936 B1
• Filed: 05/09/2000
• Issued: 12/18/2001
• Est. Priority Date: 05/09/2000
• Status: Expired due to Term

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Lence Barreiro, Juan A., Moon, Chouhwan, Huang, Harry Z., Freeland, Gary L., Mashiak, Robert H.
• Primary Examiner(s): Salata, Jonathan
• Application Number:
  US09/567,845
• Time in Patent Office: 588 Days
• Field of Search: 187/391, 187/393, 187/247, 187/248
• US Class Current: 187/393
• CPC Class Codes: B66B 5/0025 for maintenance or repair
• CPC Class Codes: G05B 19/042 using digital processors G05B19/05 takes precedence
• CPC Class Codes: G05B 2219/24055 Trace, store a working, operation history

Abstract

Elevator events and conditions are monitored so as to determine features which are notable with respect to service including repair and maintenance, a name label is stored chronologically in a log upon each occurrence of a notable feature. Attributes of the feature stored chronologically with the feature, may include the date and time, the duration of the feature or a preceding condition, the point of time in a run when the notable feature occurred, the direction of elevator car travel and the floor location of the elevator related to the notable feature. Separation markers are generated to separate notable features which relate to each other from those that do not, each marker having floor number, time and date stamps and the duration between the first feature related thereto and the last feature related thereto stored chronologically therewith. Features include door reversals, loss of non-door safeties, failure making door lock switches, door rebound, doors open too long, and doors open in flight.

Claims

1. A method of monitoring and recording information useful in servicing an elevator having a brake, including maintenance and repair, comprising:

(a) determining, from elevator operational parameters, including events and conditions, the occurrence of events or conditions which constitute notable features having significance with respect to elevator performance, and in response to each occurrence of any of said notable features, providing a corresponding feature signal;

(b) in response to each said feature signal, storing a corresponding manifestation of said notable feature in a chronological log;

(c) determining, from elevator operational parameters, an elevator operational event or condition which signifies the end of an elevator operational sequence within which said notable features may be related to a common causation, and generating a separation marker signal in response thereto; and

(d) responsive to said separation marker signal, storing a separation marker manifestation chronologically in said log, said separation marker manifestation separating notable features previously recorded in said log from notable features recorded in said log subsequent to recording said separation marker manifestation therein.

2. A method according to claim 1 wherein said feature signal is generated in response to at least one of a car door reversing direction during closure, loss of non-door elevator safeties, failure of a door lock switch to engage, rebound of a manual hoistway door during closure, a manual hoistway door being open too long, and doors opening in flight.

3. A method according to claim 1 wherein said marker signal is generated in relation to at least one of the beginning of an elevator run, the end of an elevator run, the elevator being parked, or all the door lock switches being engaged.

4. A method according to claim 1, further comprising:

determining a feature space duration related to the time elapsed between the first to occur of one of said notable features that corresponds to one of said separation markers and the last to occur of one of said notable features that corresponds to said one separation marker; and

wherein said step (d) comprises storing a manifestation of said duration chronologically with said one separation marker manifestation in said log.

5. A method according to claim 1 wherein said step (d) comprises storing a manifestation of at least one of a date stamp, a time stamp, the number of the floor location of the elevator car, and the direction of travel of the elevator car, chronologically with said separation marker manifestation in said log.

6. A method according to claim 1 further comprising:

determining at least one duration related to a corresponding one of said notable features for which a corresponding feature signal is provided; and

said step (b) comprises storing a manifestation of said duration chronologically with said notable feature manifestation in said log.

7. A method according to claim 6 wherein said duration is the duration of said notable feature.

8. A method according to claim 6 wherein said duration is the duration of a condition related to said notable feature.

9. A method according to claim 1, wherein said feature signal is generated in response to one of a car door reversing direction during closure or loss of non-door safeties;

and

said marker signal is generated in response to one of the beginning of an elevator run or the elevator being parked.

10. A method according to claim 9 wherein said marker signal is generated in response to the elevator brake being released.

11. A method according to claim 9 wherein said marker signal is generated in response to said elevator being parked for a predetermined period of time.

12. A method according to claim 11 wherein said period of time is one second if said elevator is parked with its doors closed and is thirty seconds if said elevator is parked with said doors open.

13. A method according to claim 9 wherein:

said feature signal is generated in response to a car door reversing direction during closure and further comprising;

determining the duration of said door closing before reversing its direction; and

said step (b) comprises storing said corresponding feature manifestation as a long reversal, a medium reversal, or a short reversal in dependence upon said duration.

14. A method according to claim 13 wherein said step (b) comprises storing a manifestation of said duration chronologically in said log with said feature manifestation.

15. A method according to claim 9 wherein said feature signal is generated in response to loss of non-door elevator safeties either (1) during an elevator run, in which case said corresponding feature manifestation identifies loss of safeties in flight, or (2) when said elevator is at a landing in which case said corresponding feature manifestation identifies loss of safeties at a landing.

16. A method according to claim 15 further comprising:

determining the duration of time within which non-door elevator safeties are lost; and

wherein said step (b) comprises storing a manifestation of said duration chronologically in said log with said feature manifestation.

17. A method according to claim 1 wherein said feature signal is generated in response to one of a failure of at least one door lock switch to engage, a manual hoistway door rebounding upon closure, or a manual hoistway door being open too long;

and

said marker signal is generated in response to all of the car door and hoistway door lock switches being engaged.

18. A method according to claim 17 wherein said marker signal is generated in response to all of said door lock switches being engaged for a predetermined period.

19. A method according to claim 18 wherein said period is one-half second.

20. A method according to claim 17 wherein said feature signal is generated in response to a condition which is one of a failure of at least one door lock switch to engage or a manual hoistway door being open too long, and further comprising:

determining the duration of said condition; and

wherein said step (b) comprises storing a manifestation of said duration chronologically in said log with said feature manifestation.

21. A method according to claim 1 wherein said feature signal is generated in response to any elevator door being open in flight;

and

said marker signal is generated in response to the end of the elevator run during which said feature signal was generated.

22. A method according to claim 21 wherein said marker signal is generated in response to a door open command.

23. A method according to claim 21 further comprising:

determining the duration of an elevator door being open in flight; and

wherein said step (b) comprises storing a manifestation of said duration chronologically with said feature manifestation.