System and a method for detecting an out-of-operation state of an elevator system

1. A system for detecting an out-of-operation state of an elevator system, comprising:

a monitoring unit for monitoring one or more operations of the elevator system; and

a sensor unit arranged in a vicinity of a landing call device and configured to:

detect at least one event indicating a generation of an elevator call; and

provide a message indicating the generation of an elevator call to the monitoring unit, and

wherein the monitoring unit is configured to:

initiate a time measuring function in response to receiving the message from the sensor unit; and

monitor a response of the elevator system to the generated elevator call.

2. The system according to claim 1 , wherein the monitoring unit is further configured to generate at least one signal indicating an out-of-operation state of the elevator system to an external computing entity, in response to a detection that the elevator system is not responding to the generated elevator call in an expected manner during a predefined delay time after initiating the time measuring function.

3. The system according to claim 1 , wherein the monitoring unit is further configured to provide the monitored response to the external computing entity, and the external computing entity is configured to generate an indication that the elevator system is out-of-operation, in response to a detection that the elevator system is not responding to the generated elevator call in an expected manner during a predefined delay time after initiating the time measuring function.

4. The system according to claim 1 , wherein the sensor unit comprises a first sensor device for detecting a first event indicating the generation of an elevator call within a detection zone of the first sensor device, wherein the first event is one of the following: motion of an object, gesture of an object, a change in a distance between the sensor unit and a nearest detected object.

5. The system according to claim 4 , wherein the sensor unit further comprises a second sensor device for detecting a second event within a detection zone of the second sensor device before detection of the first event by the first sensor device, wherein the second event is a motion of an object or gesture of an object.

6. The system according to claim 5 , wherein the sensor unit is configured to wake up from a sleep mode in response to a detection of the second event by the second sensor device, and to initiate a monitoring mode of the first sensor device for a predefined monitoring period.

7. The system according to claim 4 , wherein if the first event is the change in a distance between the sensor unit and a nearest detected object, the message comprises a shortest detected distance between the sensor unit and a nearest detected object, and

wherein the monitoring unit is configured to initiate the time measuring function if the received distance corresponds substantially to a reference distance range representing a distance between the sensor unit and the landing call device.

8. The system according to claim 7 , wherein the reference distance range is adjusted by the monitoring unit by a continuous learning during the operation of the system or the reference distance range is pre-defined.

9. The system according to claim 1 , wherein the message is provided to the monitoring unit in response to the detection of the at least one event indicating the generation of an elevator call or after a predefined monitoring period has elapsed.

10. The system according to claim 1 , wherein the sensor unit is retrofitted to an existing elevator system and independent of the existing elevator system, and/or

wherein the monitoring unit is a retrofitted to an existing elevator system and independent of the existing elevator system.

11. A method for detecting an out-of-operation state of an elevator system, comprising the steps of:

detecting, by a sensor unit arranged in a vicinity of a landing call device, at least one event indicating a generation of an elevator call;

providing, by the sensor unit, a message indicating the generation of an elevator call to a monitoring unit,

initiating, by the monitoring unit, a time measuring function in response to receiving the message; and

monitoring, by the monitoring unit, a response of the elevator system to the generated elevator call.

12. The method according to claim 11 , further comprising the step of generating, by the monitoring device, at least one signal indicating an out-of-operation state of the elevator system to an external computing entity, in response to a detection that the elevator system is not responding to the generated elevator call in an expected manner during a predefined delay time after initiating the time measuring function.

13. The method according to claim 11 , further comprising the steps of:

providing, by the monitoring unit, the monitored response to an external computing entity for detecting an out-of-operation state of an elevator system; and

generating, by the external computing entity, an indication that the elevator system is out-of-operation, in response to a detection that the elevator system is not responding to the generated elevator call in an expected manner during a predefined delay time after initiating the time measuring function.

14. The method according to claim 11 , wherein the sensor unit comprises a first sensor device for detecting a first event indicating the generation of an elevator call within a detection zone of the first sensor device, wherein the first event is one of the following: motion of an object, gesture of an object, a change in a distance between the sensor unit and a nearest detected object.

15. The method according to claim 14 , wherein the sensor unit further comprises a second sensor device for detecting a second event within a detection zone of the second sensor device before detection of the first event by the first sensor device, wherein the second event is motion of an object or gesture of an object.

16. The method according to claim 15 wherein the method further comprises the steps of:

waking up the sensor unit from a sleep mode in response to a detection of the second event by the second sensor device; and

initiating a monitoring mode of the first sensor device for a predefined monitoring period.

17. The method according to claim 14 , wherein if the first event is the change in a distance between the sensor unit and a nearest detected object, the message comprises a shortest detected distance between the sensor unit and a nearest detected object, wherein the method further comprises the step of initiating, by the monitoring unit, the time measuring function if the received distance corresponds substantially to a reference distance range representing a distance between the sensor unit and the landing call device.

18. The method according to claim 17 , wherein the reference distance range is adjusted by the monitoring unit by a continuous learning during the operation of the system or the reference distance range is pre-defined.

19. The method according to claim 11 , wherein the message is provided to the monitoring unit in response to the detection of the at least one event indicating the generation of an elevator call or after a predefined monitoring period has elapsed.

20. The system according to claim 2 , wherein the sensor unit comprises a first sensor device for detecting a first event indicating the generation of an elevator call within a detection zone of the first sensor device, wherein the first event is one of the following: motion of an object, gesture of an object, a change in a distance between the sensor unit and a nearest detected object.