EMERGENCY POWER SUPPLY FOR AN ELEVATOR CABIN

Abstract

A method of operating an emergency power supply for an elevator cabin includes determining a remaining power supply capacity of an energy storage device of the emergency power supply, determining a power demand of an electrical consumer, and predicting how long the energy storage device is capable of providing the electrical consumer with power, based on the determined remaining power supply capacity and the determined power demand. An emergency power supply for an elevator cabin includes an energy storage device configured to provide emergency power to an electrical consumer in the elevator cabin, and a control unit. The control unit is configured to control operation of the energy storage device, determine a remaining power supply capacity of the energy storage device, determine a power demand of the electrical consumer, and predict an amount of time for which the energy storage device is able to power the electrical consumer.

Claims

1.-15. (canceled)

16. A method of operating an emergency power supply for an elevator cabin, comprising: determining a remaining power supply capacity of an energy storage device of the emergency power supply; determining a power demand of at least one electrical consumer in the elevator cabin; and predicting a period of time in which the energy storage device is capable of providing the electrical consumer with power, based on the determined remaining power supply capacity and the determined power demand.

17. The method of claim 16, further comprising: comparing the predicted period of time to a predetermined time period threshold.

18. The method of claim 17, further comprising: providing in the elevator cabin, and/or to a maintenance facility, information representative of the result of the comparing step.

19. The method of claim 17, wherein the information provided indicates that the time period threshold exceeds the predicted period of time and is presented in the form of one or more of a visual, sound, or text-based message.

20. The method of claim 16, wherein the power demand is determined based on at least one of a power consumption or a development of the power consumption of the electrical consumer during a test interval.

21. The method of claim 16, wherein the power demand is determined based on at least one value of at least one environmental parameter of the elevator cabin.

22. The method of claim 16, wherein the remaining power supply capacity is determined based on at least one of: a value of a parameter representative of a charge level of the energy storage device; a value of a degradation parameter of the energy storage device; or a value of an environmental parameter of the elevator cabin.

23. The method of claim 16, wherein at least one of the remaining power supply capacity or the power demand is determined based on at least one operational model.

24. An emergency power supply for an elevator cabin, comprising: an energy storage device configured to provide power to an electrical consumer during a failure of an elevator main power supply; and a control unit configured to: control operation of the energy storage device, determine a remaining power supply capacity of the energy storage device, determine a power demand of the electrical consumer, and predict a period of time in which the energy storage device is capable of providing the electrical consumer with power, based on the determined remaining power supply capacity and the determined power demand.

25. The emergency power supply of claim 24, wherein said control unit is further configured to compare the predicted period of time to a predetermined time period threshold, the emergency power supply further comprising: an information interface configured to visually, textually, and/or audibly inform a maintenance technician of a result of a comparison of the predicted period of time and a predetermined time period threshold.

26. The emergency power supply of claim 25, further comprising: a communication device configured to remotely inform a maintenance facility of a result of a comparison of the predicted period of time and a predetermined time period threshold.

27. The emergency power supply of claim 24, wherein said control unit is configured to access at least one operational model in which different predicted remaining power supply capacities and/or different power demands are linked to at least one of: an operating status of an electrical consumer in the elevator cabin, an environmental parameter of the elevator cabin, a charge level of the energy storage device, or a degradation parameter of the energy storage device.

28. An elevator system, comprising: an elevator cabin configured to be moved within an elevator shaft; an emergency power supply configured to supply emergency power to at least one electrical consumer in said elevator cabin, said emergency power supply having: an energy storage device configured to provide power to the electrical consumer during a failure of an elevator main power supply, and a control unit configured to control operation of the energy storage device, determine a remaining power supply capacity of the energy storage device, determine a power demand of the electrical consumer, and predict a period of time in which the energy storage device is capable of providing the electrical consumer with power, based on the determined remaining power supply capacity and the determined power demand.

29. The elevator system of claim 28, further comprising: an electrical consumer.

30. The elevator system of claim 29, wherein said electrical consumer is one of a cabin light, an emergency communication device, or an emergency air conditioner.

Description

[0042] Further advantages and applications of the invention result from the description below referring to the figures.

[0043] FIG. 1 shows an elevator cabin comprising an emergency power supply according to an exemplary embodiment of the invention, in a schematic view.

[0044] FIG. 2 shows a block diagram of a method of operating the emergency power supply of FIG. 1 according to an exemplary embodiment of the invention.

[0045] FIGS. 3a and 3b show diagrams representative of different possible outcomes of performing the method of FIG. 2 on an emergency power supply according to FIG. 1.

[0046] In FIG. 1, an elevator cabin 1 for transporting passengers along an elevator shaft 2 of an elevator 3. The elevator cabin 1 comprises several electrical consumers 4, 5 and 6, which are exemplary depicted as a bulb of a lighting fixture 4, a microphone/speaker combination of an emergency communication device 5 and a nozzle of an air conditioning 6. The electrical consumers 4, 5 and 6 are arranged in a cabin interior 7 of the elevator cabin 1, particularly at a side wall of the cabin interior 7.

[0047] The elevator cabin 1 comprises an emergency power supply 10 according to an exemplary embodiment of the invention, which is configured to provide power to the electrical consumers during a failure of the elevator main power supply. Emergency power supply 10 is configured to run a test method according to an exemplary embodiment depicted in FIG. 2.

[0048] The emergency power supply 10 comprises an energy storage device 12 which is at least one, preferably rechargeable, battery. The energy storage device 12 can be electrically connected to the electrical consumers 4, 5 and 6 (see continuous lines in FIG. 1), to supply power in case of a main power failure.

[0049] Furthermore, the emergency power supply 10 comprises a control unit 14, which is configured to operate the energy storage device 12. The control unit 14 comprises and/or has access to an operational model 16, which exemplary comprises several characteristic diagrams, linking different predicted remaining power supply capacities C of the energy storage device 12 and/or different power demands D of the electrical consumers 4, 5, 6 to different combinations of values of various parameters.

[0050] The emergency power supply 10 furthermore comprises an information interface 18 having an LED or a display, a test trigger button 22, and a communication device 24 for remote communication with maintenance staff and/or a maintenance facility 102. Energy power supply 10 also comprises a first temperature sensor 26 for measuring a temperature of the energy storage device 12 and a second temperature sensor 28 for measuring a temperature of the cabin interior 7.

[0051] Lighting fixture 4, emergency communication device 5, air conditioning 6, energy storage device 12, information interface 18, test trigger button 22, communication device 24 and temperature sensors 26 and 28 are connected to control unit 14 for data exchange (see dotted lines in FIG. 1).

[0052] FIG. 1 also shows an emergency power supply system 100, comprising the emergency power supply 10 as well as the necessary infrastructure for starting a test method according to FIG. 2 or other exemplary embodiments of a method according to the invention, and for receiving the test results. Such infrastructure exemplary comprises a communication device 104 and a computer 106 for starting the test method and displaying the results in a maintenance facility 102 which may also remotely trigger the test.

[0053] Particularly, the test can also be started by and the results can also be transmitted to a mobile communication device of maintenance staff 8, particularly by a direct transfer (via cloud, blue tooth, 3G, etc.) or an intedirect transfer after the data passes through the maintenance facility.

[0054] Communication between communication devices 24 and 104 can exemplary be established via a cloud-based service 108, for example Microsoft Azure, deploying a communication standard of an Ethernet, WiFi, Bluetooth, G3, G4, G5 or similar type.

[0055] Emergency power supply 10 is configured to run a test method according to an exemplary embodiment invention, aiming at predicting whether energy storage device 12 will be able to provide sufficient emergency power to electrical consumers 4, 5 and 6 during a predetermined time period threshold P.sub.p (predetermined by standardization requirements). Detailed steps of the exemplary method will be described below with respect to FIGS. 2 and 3.

[0056] FIG. 2 shows a block diagram of steps S10 to S70 performed during testing the energy storage device's 12 capability to provide sufficient emergency power long enough.

[0057] In step S10, a maintenance technician 8 hits the trigger button 22 to start the test procedure according to the exemplary method. This trigger activates control unit 14 for carrying out the steps described below.

[0058] In step S11, a charge level of the energy storage device 12 is determined, particularly by accessing a battery management system (not shown in FIG. 1) and/or the operational model 16. Thus, a measure of the energy amount contained in the battery can be derived.

[0059] In step S12, a degradation level of the energy storage device 12 is determined, particularly by accessing a battery management system and/or the operational model 16. Thus, a measure of the energy amount and supply speed from the battery can be derived.

[0060] In step S13, a current temperature of the energy storage device 12 is determined, particularly taking values of temperature sensor 26 into account. Thus, certain temperature-based limitations of a battery operation can be derived for especially high or low temperatures.

[0061] Based on the measures determined in steps S11, S12 and S13, a remaining power supply capacity C of the energy storage device 12 of the emergency power supply 10 is determined in step S20.

[0062] In the exemplary embodiment of FIG. 2, the remaining power supply capacity C can be derived in various suitable forms. Exemplary, a remaining capacity C of the battery 12 in ampere-hours and/or a remaining time in which the energy storage device 12 will be able to provide more than a threshold current can be determined.

[0063] In step S31, a present power consumption of the electrical consumers 4, 5 and 6 is measured during a test interval. In an optional step S32, a development of the power consumption of electrical consumers 4, 5 and 6 during the test interval can be measured.

[0064] In an exemplary embodiment, an operational status (e.g. on/off) is determined and linked to a power consumption deposited in operational model 16 for the present status, optionally depending on a temperature measured in cabin interior 7 by temperature sensor 28.

[0065] From the steps S31 and S32, a present and/or average and/or power demand D of the electrical consumers 4, 5 and 6 is determined in step S40.

[0066] In an exemplary embodiment, the single power demands determined for the different electrical consumers 4, 5 and/or 6 are combined for determining overall power demand D in step S40, particularly stating an overall current supply required by the consumers 4, 5 and 6. The determined power demand D particularly can be a constant value or described by a suitable function over time.

[0067] In step S50, a period of time P for the capability of the energy storage device 12 to provide the electrical consumers 4, 5 and 6 with sufficient power is predicted, particularly by comparing the remaining supply power capacity C determined in step 20 and the overall power demand D determined in step S40. For example, the remaining capacity C has been determined in ampere-hours (Ah) and the overall power demand D has been determined in amperes (A), the period of time can be calculated via the fraction: P=C/D.

[0068] By a comparison (step S60) with a predetermined time period threshold P.sub.p, an information on whether energy storage device 12 can support electrical consumers 4, 5 and 6 long enough for meeting a standardization requirement can be obtained as a test result.

[0069] This information is provided in step S70. For a case in which a maintenance technician 8 is present in the cabin 7, the LED of information interface 18—for example—intermittently flashes in case requirements are not met (reference sign “n. OK”) and continually shines in case requirements are met (reference sign “OK”).

[0070] For a case in which test results are to be transmitted to a remote maintenance facility 102, a detailed test report is transmitted via communication devices 24, cloud-based service 108 and communication device 104 to computer 106. For a case in which test results are to be transmitted to a mobile device of maintenance technician 8, a detailed test report is transmitted via communication device 24, particularly using a Bluetooth or Wi-Fi connection.

[0071] In FIG. 3a, a diagram representative of a positive outcome of the test according to FIG. 2 is shown. The diagram shows a predicted battery voltage over time and also illustrates the test interval T.

[0072] The data presented in this diagram has been derived by the control unit 10 accessing operational model 16 for a deposited correlation between remaining capacity of energy storage device 12, overall power consumption of electrical consumers 4, 5 and 6, and remaining battery voltage.

[0073] FIG. 3a shows a case in which battery 12 is predicted to provide more than a threshold voltage of 10.5 Volts for a period of time P.sub.OK longer than the required time period threshold P.sub.p of one hour. In this case, energy storage device 12 can still be deployed, at least until the next scheduled inspection.

[0074] FIG. 3b shows a case in which battery 12 it is predicted to cease providing more than the threshold voltage after a period of time P.sub.n.OK before the required time period threshold P.sub.p of one hour has passed by. In this case, energy storage device 12 must be changed to fulfil the standardization requirement.

List of Reference Signs

[0075] 1 elevator cabin

[0076] 2 elevator shaft

[0077] 3 elevator

[0078] 4, 5, 6 electrical consumers (lighting fixture 4, emergency communication device 5, air conditioning 6)

[0079] 7 cabin interior

[0080] 8 maintenance technician

[0081] 10 emergency power supply

[0082] 12 energy storage device

[0083] 14 control unit

[0084] 16 operational model

[0085] 18 information interface

[0086] 22 tests trigger button

[0087] 24 communication device

[0088] 26 first temperature sensor

[0089] 28 second temperature sensor

[0090] 100 emergency power supply system

[0091] 102 maintenance facility

[0092] 104 communication device

[0093] 106 desktop computer

[0094] 108 cloud-based service

[0095] C remaining power supply capacity of the energy storage device

[0096] D power demand of the electrical consumers

[0097] n.OK positive test result

[0098] n.OK negative test result

[0099] P period of time

[0100] P.sub.p predetermined time period

[0101] S10-S70 method steps

[0102] T test time interval