EP2931643B1 - Monitoring device for a passenger transport system - Google Patents

Description

description

The invention relates to a monitoring device for passenger transport systems, which are designed as a lift, escalator or moving walk, such a passenger transport system and a method for such a passenger transport system. Specifically, the invention relates to the field of elevator installations.

From the WO 02/12109 A1 For example, a monitoring device for an elevator is known. The known monitoring device has a plurality of non-contact actuated switching devices, which are connected in series with each other to form a safety circuit. The switching devices must have a certain state in order to perform an intended action safely. In particular, it must be ensured in normal operation in an elevator system that all doors remain closed and mechanically locked when an elevator car of the elevator system moves. If the elevator car does not move, then a shaft door may only be opened when the elevator car is at this shaft door. In the known monitoring device, each switching device has an active unit and a passive unit, wherein the active unit and the passive unit are designed such that the passive unit is excited exclusively by a pattern generated by the active unit. The active unit is designed as a query unit. The passive unit is designed as a response unit. The interrogation unit is designed here in such a way that it is able to transmit information to the response unit and to receive information from the response unit. A first coil of the interrogation unit and a second coil of the response unit are designed as antennas. The interrogator transmits energy to the responder via an electromagnetic field. This is done by electromagnetic coupling because the energy transfer works similarly as in a transformer where the energy from the primary winding is transferred by tight coupling to the secondary winding. The coupled via the electromagnetic field energy stores the response unit temporarily in an energy storage. Once the response unit has received enough energy, it becomes functional and responds in a very specific manner to the pattern generated by the query unit.

The from the WO 02/12109 A1 known monitoring device has the disadvantage that the interrogation unit must be permanently powered by a power supply, such as a supply network with electrical energy. If this power supply fails, for example, temporarily or an energy transmission to the interrogation unit of the monitoring device is disturbed, then the monitoring device is no longer functional. Because of lack of energy can then take place via the active unit and no charge of the energy storage of the passive unit. Thus, it can no longer be recognized if a door is opened. If the door is closed again during the power failure, then such a possible action remains unrecognized.

From the EP2452907 A1 are a monitoring device, or a method according to the preamble of claim 1, or 11 known.

The object of the invention is to provide a monitoring device for passenger transport systems, which are configured as a lift, escalator or moving walk, such a passenger transport system and a method for monitoring such a passenger transport system, which are designed improved. Specifically, it is an object of the invention to provide a monitoring device for passenger transport systems, which are designed as elevator, escalator or platform, such a passenger transport system and a method for monitoring such a passenger transport system, in which a foreign operation of a device of the passenger transport system during a temporary interruption external energy supply can be detected.

The object is achieved by a monitoring device for passenger transport systems, which are designed as a lift, escalator or moving walk. The monitoring device has at least one detection device which serves to detect a foreign operation of a device of the passenger transport system, and at least one energy store for storing electrical energy. A foreign operation is to be understood as meaning an actuation of the device which is attributable to an external action and does not occur, for example, on the basis of a control signal of a control device of the passenger transport system. Such foreign operations can be, for example, the opening of the shaft doors by a person who gains access to the elevator shaft by means of a triangular wrench. There are also other third-party operations conceivable, for example, when a shaft door has been forcibly opened or pressed.

The energy storage device is stable in a charged state regardless of an existing external power supply. The detection device detects a foreign operation of the device in that the energy storage is offset after the external operation of the device in a discharged state. The state of the energy store can be queried by a suitable means, for example by the control device of the passenger transport system. A discharged state of the energy storage always represents a foreign operation and this even then when the device itself has returned to its original initial state. The initial state of origin is the physical state that the device was in before it was externally actuated. In the case of a shaft door, for example, this would be the closed state. Even if the energy storage device is defective, a foreign operation is assumed due to the discharged state and the passenger transport system must be checked by a specialist. Only a deliberate reset or load the energy storage clears the information that a foreign operation was done.

The object is further achieved by a passenger transport system with at least one monitoring device and by a method for monitoring a passenger transport system with at least one monitoring device.

It is advantageous that, in the event of an interruption of the external energy supply, the energy store is put into a discharged state when the detection device detects the third-party operation of the device, and the control device switches to the special operating state after the external power supply has been interrupted, when the energy store is in is in the discharged state. The monitoring device is characterized by a special use or interconnection of the energy storage device for storing electrical energy. If the external power supply is available, then the energy storage for detecting a foreign operation of the device of the passenger transport system is not necessarily needed. Because then can be communicated to the control device in a conventional manner, for example via a bus system, the detection of the foreign operation. When the external power supply, however is interrupted, then the state of the energy storage in response to detection of a foreign operation can be manipulated. If no external operation is detected during the interruption of the external power supply, then the energy storage device remains charged. On the other hand, if a foreign operation of the device of the passenger transport system during the interruption of the external power supply is detected, then the energy storage is manipulated and placed in a non-charged state. After the interruption of the external power supply, the state of the energy store can then be queried, for example, as part of an initialization procedure. The state of the energy storage now indicates whether during the interruption of the external power supply, a foreign operation of the device of the passenger transport system has taken place or not. If a foreign operation has taken place, then the control device switches to the special operating state.

However, in a possible embodiment of the monitoring device or the passenger transport device or the method of the energy storage can be used even with existing external power supply to hold a completed foreign operation of the device. In this case, the energy store can also be set to the discharged state in the non-current-free state of the external power supply when the external operation of the monitored device is detected. This can also be done in addition to a further safety circuit and / or another safety device. As a result, a redundant monitoring and / or query is possible. The energy storage can thus be used as a state memory in such a case. In this case, it is advantageous for the control device to switch to the special operating state when the energy store is in the discharged state. In addition, the control device can also switch directly to the special operating state when the external power supply exists if the detection device detects the third-party confirmation of the device.

Under the charged state of the energy storage and the non-charged state of the energy storage two different states of the energy storage are to be understood. A charged state here is not necessarily a fully charged state. In particular, during the interruption of external power supply also by design, a slight discharge occur. Furthermore, a maximum possible charge of the energy store can also vary due to component scattering or component aging. Furthermore, the energy storage even in the discharged state still carry a cargo residue, as a complete discharge to distinguish the states may not be necessary and possibly also due to the design is too expensive or takes too long. What is essential is a reliable differentiation of the charged state of the energy store from the discharged state of the energy store.

It is advantageous that at least one threshold value for the energy store is predetermined, that in the case of an existing external energy supply, the energy store can be set into a charged state in which the charge of the energy store is greater than the at least one threshold value, and that at the interruption of the external store Power supply of the energy storage is placed in a discharged state in which the charge of the energy storage is smaller than the at least one threshold, when the detection means detects the external operation of the device of the passenger transport system. Specifically, an upper threshold and a lower threshold for the energy storage can be specified, wherein the upper threshold is greater than the lower threshold. In this case, the energy store is charged above the upper threshold so that it is in the charged state. Further, the energy storage is discharged below the lower threshold, so that it is in the discharged state. By way of the distance between the lower threshold and the upper threshold, a sufficient separation and thus a distinctness of the states are ensured.

It is also advantageous that, in the existing external energy supply, the control device only transfers the energy store from the discharged state into the charged state if the detection device does not detect a foreign operation of the device. If a foreign operation of the device still exists at this time, then a reset is prevented. This is useful, for example, for the possibility of an automatic reset, which may depend on other conditions.

Additionally or alternatively, it is advantageous that the control device in the existing external power supply the energy storage only then transferred from the discharged state to the charged state when the control device blocks a passenger transport through the passenger transport system in the special operating state and a manual release takes place. An automatic reset is not possible in this case. The manual release may be reserved for an authorized service person, for example. For example, it is conceivable in an elevator installation that a foreign operation of an elevator door is monitored on a floor. If during the interruption of the external power supply this floor door has been opened and closed again, then there may still be a person in the elevator shaft. Thus, the elevator system is first blocked. This applies correspondingly to an escalator or moving walk, for example when a cover is opened to an engine compartment and this cover is monitored by means of a monitoring device according to the invention.

It is also advantageous that the detection device comprises at least indirectly mechanically actuated by the device of the passenger transport system switching element which is operable to detect the external operation, and that when the switching element is actuated, a circuit for discharging the energy storage is closed. The mechanically operable switching element can be configured, for example, as a button. The components for discharging the energy storage, which are located in the circuit, in this case are dimensioned so that a sufficiently fast discharge of the energy storage is guaranteed. Thus, a simple mechanical activation is possible. The switching element can thus be configured in particular as a passive switching element. This can be dispensed with a local power supply.

A particular advantage of the invention is that the monitoring device is not easy to manipulate manually, for example, by clamping the button, as has been made illegal in rare cases and has led to serious accidents. The discharged energy storage "stores" the operation of the device permanently and must first be reloaded so that the passenger transport system can be returned to normal operating condition.

However, it is also advantageous that the detection device is one of the device the passenger transport system having at least indirectly electrically, electronically or electromagnetically operable active switching element which is operable to detect the foreign operation, and that when the switching element is actuated, a circuit for discharging the energy storage is closed. In this way, in particular, a non-contact detection of the foreign operation of the device of the passenger transport system can be realized. In addition, a reliable and extensive discharge of the energy store can be achieved by a circuit construction with the active switching element. For example, the discharge can also take place over a comparatively long period of time, even if the activation takes place only for a short time. In addition, the monitoring can thereby be made more complex and, for example, arisen against artifacts (a method-related fake result or the effects of a system weakness on a useful signal in the measurement, signal or similar technique) and external manipulation are made insensitive.

Here, the active switching element or an active query unit with a switching element can be at least partially powered by the energy storage with energy. Additionally or alternatively, an independent energy source, in particular a battery or a rechargeable battery, may be provided, which is independent of the external power supply, wherein the active switching element is at least partially powered by the independent energy source with energy. In particular, the independent energy source can ensure the energy supply of the active switching element only when the external power supply is interrupted.

For redundancy reasons, an embodiment is also conceivable in which both a passive switching element and an active switching element or an active interrogation unit with a switching element for detecting a foreign operation of the same device of the passenger transport system are provided.

Figur 1

eine Personentransportanlage mit einer Überwachungseinrichtung in einer auszugsweisen, schematischen Darstellung entsprechend einem Ausführungsbeispiel der Erfindung;

Figur 2

eine Überwachungseinrichtung der in Figur 1 dargestellten Personentransportanlage in einer auszugsweisen, schematischen Darstellung entsprechend einer ersten möglichen Ausgestaltung der Erfindung;

Figur 3

eine Überwachungseinrichtung der in Figur 1 dargestellten Personentransportanlage in einer auszugsweisen, schematischen Darstellung entsprechend einer zweiten möglichen Ausgestaltung der Erfindung in einem nicht betätigten Zustand einer Einrichtung der Personentransportanlage und

Figur 4

die in Figur 3 dargestellte Überwachungseinrichtung in einem fremdbetätigten Zustand der Einrichtung der Personentransportanlage.

Preferred embodiments of the invention are explained in more detail in the following description with reference to the accompanying drawings, in which corresponding elements are provided with corresponding reference numerals. Show it:

FIG. 1

a passenger transport system with a monitoring device in one in summary, schematic representation according to an embodiment of the invention;

FIG. 2

a monitoring device of in FIG. 1 illustrated passenger transport system in a partial, schematic representation according to a first possible embodiment of the invention;

FIG. 3

a monitoring device of in FIG. 1 illustrated passenger transport system in a partial, schematic representation according to a second possible embodiment of the invention in a non-actuated state of a device of the passenger transport system and

FIG. 4

in the FIG. 3 Monitoring device shown in an externally operated state of the device of the passenger transport system.

Preferred embodiments of the invention

FIG. 1 shows a passenger transport system 1, which is designed as an elevator (elevator system) 1, with a monitoring device 2 in an excerpt, schematic representation according to an embodiment. In a modified embodiment, the passenger transport system 1 can also be designed as an escalator or moving walk.

The monitoring device 2 has a control device 3 and a plurality of detection devices 4 to 9. The detection devices 4 to 9 are connected to the control device 3 via a bus system 10.

The passenger transport system 1 also has a system controller 11, an external power supply 12, which is connected to a power supply, for example, an input device 13 and an output device 14. In this case, the external energy supply 12 can supply the detection devices 4 to 9 with energy parallel to the data transmission via the bus system 10. Furthermore, the external power supply 12 supplies the control device 3, the system controller 11 and optionally the input device 13 and the output device 14 with energy, the related lines are not shown for ease of illustration. For example, elevator-relevant data, which are relevant for maintenance, for example, can be transmitted to the control device 3 via the input device 13. Furthermore, the control device 3 can output data via the output device 14 that are relevant for an operator, in particular a maintenance person. The control device 3 can also engage in the system controller 11. As a result, the control device 3 can switch to a special operating state. In the special operating state, transport through the passenger transport installation 1 is then blocked. This can be done for example by activating a brake, in particular a safety brake, and / or by deactivating a prime mover.

The passenger transport system 1 has means 15, 16, which are configured in this embodiment as doors 15, 16. Such doors 15, 16 may be located on a floor of a building. With closed doors 15, 16, access to a lift shaft is closed. The devices 15, 16 may be externally operated by persons, in particular open. In this embodiment, a possible external operation of the device 15 is detected by the detection device 4. A possible external operation of the device 16 is detected by the detection device 5.

The term of the externally operable devices 15, 16 is to be understood in this case in general. The devices 15, 16 can also be designed as flaps, locks, in particular triangular locks, of doors, in particular shaft doors, which are monitored. The devices 15, 16 are not necessarily part of the monitoring device 2. In particular, the monitoring device 2 can also be manufactured and distributed independently of such devices 15, 16.

The detection devices 6 to 9 are used to monitor other such devices that are not shown for simplicity.

By the detection devices 4, 5 thus serving as shaft doors 15, 16 devices 15, 16 can be monitored. This can be used to determine if someone could get into the elevator shaft. In particular, can be monitored in a lift 1 with reduced pit head or no pit head, whether someone on could reach the cabin roof of the elevator car. With existing external power supply 12, this information can be transmitted directly to the control device 3 via the bus system 10. With an interruption of the external power supply 12 with respect to the detection means 4, 5, monitoring is also possible, as is also the case with reference to FIGS Fig. 2 to 4 is described. Thus, the passenger transport system 1, for example, after a power failure independently go back to normal operation, if no external operation by means 15, 16 is done. In this embodiment, an independent return to normal driving is thus possible if none of the shaft doors 15, 16 has been opened in the meantime.

FIG. 2 shows a monitoring device 2 of in FIG. 1 illustrated passenger transport system 1 in an abstract, schematic representation according to a first possible embodiment of the invention. The detection device 5 has a local control unit 20 and an interface 21. The local control unit 20 is connected to the bus system 10 via the interface 21. In particular, the local control unit 20 is then connected to the control device 3 when the external power supply 12 is available. In this case, the local control unit 20 itself can be fed by the existing external power supply 12.

The detection device 5 has an energy store 22 for storing electrical energy. The energy storage 22 is formed by a capacitor 22 in this embodiment. Furthermore, a local voltage source 23 is provided, which serves as a charge source 23. The local voltage source 23 may in this case depend on the external power supply 12. If the external power supply 12 is interrupted, then in this case, the local voltage source 23 is inoperative. Of course, the local voltage source 23 may also be a battery or an accumulator. Further, a resistor 24 and a switching element 25 are provided. The switching element 25 can be actuated by the local control unit 20, as illustrated by the broken arrow 26. When the switching element 25 is closed, the energy store 22 is charged by the local voltage source 23 via the resistor 24.

After loading, the switching element 25 can be opened again. As a result, the energy store 22 can be kept in the charged state when the external power supply 12 is present. Optionally, the energy storage 22 can be maintained in the charged state by the switching element 25 is kept closed with existing external power supply 12. It is also possible to close the switching element 25 at certain intervals in order to compensate for a possible loss of charge of the energy store 22 as long as the external power supply 12 is present.

If the external power supply 12 is interrupted and / or an actuator 27 is actuated, then the switching element 25 is opened, if the switching element 25 should not yet be in an open state.

In this embodiment, a pin-shaped, mechanical actuator 27 is provided. The pin-shaped, mechanical actuator 27 is in this case actuated by the device 16, as illustrated by the double arrow 28. For example, the actuating element 27 can be adjusted by opening the door 16. Accordingly, the actuating element 27 can also be adjusted when opening a lock, in particular a triangular lock.

The detection device 5 also has a circuit 30, which is formed from the energy store 22, a resistor 31 and a mechanically operable switching element 32. The mechanically operable switching element 32 may be configured in particular as a button 32. When the actuating element 27 closes the pushbutton 32, the energy store is discharged via the resistor 31 when the switching element 25 is open. Even if the actuator 27 is reset, the energy storage 22 remains discharged because the switching element 25 is open and therefore the voltage source 23 is inoperative. This operating principle applies regardless of whether the external power supply 12 is present or interrupted. However, it is a particular advantage of the invention that a detection of an actuation of the actuating element 27 is possible even when the external power supply 12 is interrupted. When the interruption of the external power supply 12 ends, the local voltage source 23 is again in operation, but the switching element 25 remains open. Thus, the energy storage 22 is kept in the discharged state.

The local control unit 20 has inputs 33, 34, via which the state of the energy store 22 can be detected or read out. If a possible actuation of the actuating element 27 is to be retrieved, for example if the external power supply 12 is again present, then the control device 3 requests the state of the energy store 22 from the local control unit 20 via the bus system 10. If the local control unit 20 reports a discharged state of the energy store 22, then the control device 3 blocks a possible passenger transport via the system control 11.

Thus, upon an interruption of the external power supply 12, the energy storage 22 is placed in a discharged state when the detection device 5 detects the external operation of the device 16. If the energy storage device 22 is then in the discharged state after the interruption of the external power supply 12, then the control device 3 then switches to the special operating state. This particular operating state can be displayed via the output device 14 of an operator, in particular a service technician. Via the input device 13, a provision can then be commissioned.

However, the control device 3 only displaces the energy store 22 from the discharged state into the charged state when the external energy supply 12 is present if the detection device 5 no longer detects any external operation of the device 16. This means that the door 16 is closed again or one of the door 16 associated lock is locked again. In addition, a manual release must be carried out by the service technician so that the control device 3 puts the energy store 22 from the discharged state into the charged state.

In this exemplary embodiment, the manual release takes place by means of the input device 13. The manual release is transmitted from the control device 3 to the local control unit 20. Furthermore, the energy storage 22 in this embodiment, by design, can only be placed in the charged state when the circuit 30 is opened again. When the switching element 32 is opened and at the same time the local control unit 20 closes the switching element 25, then the energy store 22 is charged by the local voltage source 23. It makes sense a charge of the energy storage device 22 only when the passenger transport system 1 is transferred from the special operating state in a normal operating state with existing external power supply 12 and after performing predetermined checks by authorized personnel from the special operating state.

The local control unit 20 may also monitor via the inputs 33, 34 a charging of the energy storage 22. In this case, a threshold value for the energy store 22 can be predetermined, via which the energy store 22 is charged.

In this embodiment, designed as a button 32, mechanically actuated switching element 32 is a passive switching element 32nd

FIG. 3 shows a monitoring device 2 of in FIG. 1 The detection device 4 of the monitoring device 2, in this embodiment has an active unit 42 embodied as an interrogation unit 42 and a response unit 43 in the form of an exemplary, schematic representation according to a second possible embodiment trained passive unit 43 on. The response unit 43 may be, for example, a transponder, a tag, a smart card or a chip card. The interrogation unit 42 has a first coil 44. The response unit 43 has a second coil 45. The interrogation unit 42 and the response unit 43 are in an idle state when the device 15 is not actuated. In the idle state, the interrogation unit 42 and the response unit 43 are spaced so far apart that no interaction takes place. In this embodiment, a possible interaction takes place by electromagnetic coupling. At rest, therefore, there is no sufficient electromagnetic coupling between the coils 44, 45th

The operation of the monitoring device 2 according to the second possible embodiment is described below with reference to the FIG. 4 described.

FIG. 4 shows the in FIG. 3 shown monitoring device 2 in an externally operated state of the device 15 of the passenger transport system 1. Since the device 15 is in an externally operated state, an adjustment of Answer unit 43 opposite to in the FIG. 3 illustrated state is done. Specifically, the response unit 43 may be adjusted in a direction 46 toward the interrogation unit 42. As a result, the first coil 44 of the interrogation unit 42 and the second coil 45 of the response unit 43 are so close to each other that an interaction is possible. Thus, there is an electromagnetic coupling between the coils 44, 45th

In this embodiment, the interrogation unit 42 has a first modulator 47 and a first demodulator 48. Further, a generator 41 is provided, which may be configured for example as a high-frequency generator 41 or radio frequency generator 41. The response unit 43 has a second modulator 49 and a second demodulator 50. Furthermore, the response unit 43 has an energy store 51, which is formed, for example, by a capacitor 51. The response unit 43 is therefore preferably without its own power supply, such as a battery from.

The interrogation unit 42 is capable of transmitting information to the response unit 43 and obtaining information from the response unit 43. The coils 44, 45 serve here as antennas 44, 45. The interrogation unit 42 transmits the response unit 43 energy via an electromagnetic field. This is done via an electromagnetic coupling, which works in a similar way to a transformer in which the energy from a primary winding is transferred by tight coupling to a secondary winding. The energy coupled in via the electromagnetic field temporarily stores the response unit 43 in the energy store 51. As soon as the response unit 43 has received sufficient energy, it is functional and specifically responds to a pattern M generated by the interrogation unit 42.

The pattern M generated by the interrogation unit 42 and a response M 'may be, for example, numbers represented by a pattern. The pattern M that excites the response unit 43 does not have to be very complex in this case, since it primarily serves to transmit energy and thus to trigger the response M '. In one possible embodiment, the pattern M may be a phase-modulated high-frequency signal. The pattern M is preferably used by the response unit 43 for energy generation and synchronization of a response. Thus, the pattern M can be understood as an instruction to the response unit 43, a to generate corresponding answer M '.

Thus, a causal linkage of the response M 'and the request M can be ensured.

The response unit 43 may change the pattern M such that it is ensured that the change is made by the response unit 43 itself and not by another element. For example, the response unit 43 may respond to a request M by transmitting a unique number M '. Thus, a unique identification of the response unit 43 is possible.

Thus, it can be clearly distinguished between an unactuated state of the device 15 and a foreign-actuated state of the device 15.

In one possible embodiment, the interrogation unit 42 of the detection device 4 has an independent energy source 55, which is independent of the external power supply 12. The independent energy source 55 can therefore also supply energy to the interrogator 42 configured as an active unit 42, even if the external power supply 12 is interrupted. In particular, the generator 41, the first modulator 47 and the first demodulator 48 can thus be supplied with energy.

The response unit 43, which is designed as a passive unit 43, however, does not require an independent energy source. The independent power source 55 may be formed by, for example, a battery 55 or an accumulator 55. Thus, if necessary, a charge of the independent power source 55 via the external power supply 12 in the ordinary mode is possible.

The interrogation unit 42 has a local control unit 20 'and an active switching element 56. The active switching element 56 may comprise at least one transistor. When the external power supply 12 is interrupted, the local control unit 20 'and the active switching element 56 may be powered by the independent power source 55.

If an externally operated adjustment of the device 15 takes place, then enter the coils 44, 45 in a distance in which an electromagnetic coupling is possible, as in the FIG. 4 is shown. By the exchange of the patterns M, M 'is detected that a foreign operation of the device 15 takes place. Thereafter, the local control unit 20 'switches the active switching element 56 to discharge the energy storage 22'.

After the interruption of the external power supply 12, the control device 3 reads out the state of the energy store 22 'via the local control unit 20'. Thus, the control device 3 can determine whether a foreign operation of the device 15 has occurred or not during the interruption of the external power supply 12.

Subsequently, under certain conditions, the energy storage 22 'can be put back in the charged state, as determined by the FIG. 2 is described. For this purpose, the local control unit 20 ', the switching element 25' switch. The charging of the energy store 22 'can take place at least indirectly via the external power supply 12.

In a modified embodiment, it is also possible that the independent energy source 55 of the interrogation unit 42 is omitted. The energy supply of the interrogation unit 42, which is an active unit 42, can in this case be taken over by the energy store 22 '. For this purpose, the energy store 22 'can be discharged, for example, below a threshold value, wherein this threshold value is chosen to be so high that a sufficient energy supply of the interrogation unit 42 is ensured even below the threshold value. The discharged state of the energy store 22 'is then to be understood as being discharged only in relation to the threshold value and not with respect to a possible energy supply of the interrogation unit 42.

In a further possible embodiment of the energy storage 22 'also serve to power the interrogation unit 42. However, the active switching element 56 may in this case be designed such that, when the active switching element 56 is closed, there is a progressive discharge of the energy store 22 '. The energy storage 22 'can then be discharged so far that when interrupted external power supply 12, the interrogation unit 42 for lack of sufficient Energy supply is no longer functional. If the external power supply 12 then exists again, then the discharged state of the energy storage 22 'can still be read out.

In a further possible embodiment, the energy supply of the interrogation unit 42 of the detection device 4 can also be ensured in part via the energy store 22 'and partly via the independent energy source 55.

Thus, the active switching element 56 can be at least indirectly actuated electromagnetically. The electromagnetic actuation takes place in the basis of FIGS. 3 and 4 described embodiments by the electromagnetic coupling. In a corresponding manner, an electrical or electronic actuation of the active switching element 56 of the detection device 4 can also take place at least indirectly if a foreign operation of the device 15 occurs when the external power supply 12 is interrupted.

Thus, the functioning of a bistable switch via the energy store 22, 22 'can be realized locally at each detection device 4 to 9. Via the bus system 10, a central query by the control device 3 is possible after an interruption of the external power supply 12. The control device 3 can thus ensure central monitoring. As soon as at least one of the detection devices 4 to 9 detects a third-party operation, this is represented by a discharged energy storage 22, 22 'initially stored locally at the respective detection device 4 to 9 and then reported to the central control device 3. Thus, depending on the situation in the operation can be intervened. Regardless, can be ensured by the detection devices 4 to 9 even with existing external power supply 12 monitoring. Depending on the situation, the control device 3 can decide, for example, that no stopping takes place, that a safety brake is activated or that a quick stop is required.

The resetting of the respective local energy store 22, 22 'can only be possible under certain circumstances. For example, it may be necessary for all doors 15, 16 to be closed. Furthermore, it may be necessary that no revision is currently being made. The control device 3 can reset via the bus system 10th command centrally. Thus, a central operation via the input device 13 and the output device 14 and still a local monitoring is possible.

In addition, a function test routine can be started via the input device 13. For example, in such a bump test routine, load and unload operations may be performed during breaks or maintenance. As a result, the energy stores 22, 22 'can be tested for sufficient functionality, in particular a sufficient capacity. Also possible are a charge measurement, a charge time measurement, a voltage loss measurement and the like in order to estimate a lifetime of the individual energy stores 22, 22 '. This allows for predictive maintenance.

In a further possible modification, the discharge of the energy store 22 can also take place via a resistor 31, which is designed as a warning light 31. Furthermore, it is advantageous that the resistor 31 is dimensioned so that the energy is rapidly dissipated in a foreign operation.

In the method for monitoring the passenger transport system 1, it is advantageous that in an interruption of the external power supply 12 of the energy storage 22, 22 'is placed in a discharged state when the external operation of the device 15, 16 is detected, and that after the interruption external power supply 12 is switched to the special operating state when the energy storage 22, 22 'is in the discharged state.

The invention is not limited to the described embodiments. Thus, a wide variety of safety-relevant switches of the passenger transport system, for example, also car doors, access doors of engine rooms and the like can be supplemented or monitored by the monitoring device according to the invention.

Claims (14)

1. Monitoring device (2) for transport installations (1) for persons, which installations are designed as elevators, escalators or moving walkways, comprising at least one detecting device (4, 5, 6, 7, 8, 9), which serves for detecting external actuation of an item of equipment (15, 16) of the transport installation (1) for persons, and with an energy store (22, 22') for storing electrical energy, wherein the energy store (22, 22') can be kept in a charged state independently of an external energy supply (12) which is present and wherein the detecting device (4, 5, 6, 7, 8, 9) detects external actuation of the item of equipment (15, 16) in that the energy store (22, 22') is transferred to a discharged state after external actuation of the item of equipment (15, 16), characterised in that the discharged state of the energy store (22, 22') also represents external actuation when the item of equipment has re-adopted the original start state thereof.
2. Monitoring device according to claim 1, wherein the detecting device (4 - 9) comprises at least one switching element (32), which is mechanically actuable at least indirectly by the item of equipment (15, 16) of the transport installation (1) for persons and is actuable for detection of external actuation of the item of equipment (15, 16), and that when the switching element (32) is actuated a current circuit (30) is closed for discharging the energy store (22, 22').
3. Monitoring device according to claim 2, wherein the switching element (32) is a passive switching element (32).
4. Monitoring device according to any one of claims 1 to 3, wherein the detecting device (4, 5, 6, 7, 8, 9) comprises a switching element (56), which is electrically, electronically or electromagnetically actuable at least indirectly by the item of equipment (15, 16) of the transport installation 91) for persons and which is actuable for detection of external actuation of the item of equipment (15, 16) of the transport installation (1) for persons, and that when the switching element (56) is actuated a current circuit for discharging the energy store (22') is closed.
5. Monitoring device according to claim 4, wherein the switching element (56) is an active switching element (56), which can be supplied with energy at least in part by the energy store (22') and/or at least in part by an independent energy source (55), and/or a switching element (56) of an active unit (42) of the detecting device (4, 5, 6, 7, 8, 9), which can be supplied with energy at least in part by the energy store (22') and/or at least in part by an independent energy source (55).
6. Monitoring device according to claim 4 or 5, wherein the detecting device (4, 5, 6, 7, 8, 9) comprises a local control unit (20, 20'), which can be supplied with energy at least in part by the energy store (22, 22') and/or at least in part by an independent energy source (55) of the detecting device (4, 5, 6, 7, 8, 9) and that the local control unit (20, 20') controls the discharging of the energy store (22, 22'), which takes place on interruption of the external energy supply and external actuation of the item of equipment (15, 16) in such a way, that a residual energy is left in the energy store (22, 22') in case of the energy store counts as discharged, wherein the residual energy is still sufficient for supply at least the active switching element (56) or the active unit (42) for switching to the special operating state.
7. Monitoring device according to any one of claims 1 to 6, wherein at least one threshold value for the energy store (22, 22') is predetermined and the energy store (22, 22') is transferrable into a charged state in which the charge of the energy store (22, 22') is greater than the at least one threshold value and after detection of external actuation of the item of equipment (15, 16) the energy store (22, 22') is transferred by a discharging process to a discharged state in which the charge of the energy store (22, 22') is less than the at least one threshold value.
8. Monitoring device according to claim 7, wherein an upper threshold value and a lower threshold value for the energy store (22, 22') are predetermined and that the upper threshold value is greater than the lower threshold value.
9. Transport installation (1) for persons, which installation is designed as an elevator, escalator or moving walkway, with a monitoring device (2) according to any one of claims 1 to 8 and at least one externally actuable item of equipment (15, 16) associated with at least one detecting device (4, 5, 6, 7, 8, 9) of the monitoring device (2).
10. Transport installation for persons according to claim 9, wherein a plurality of externally actuable items of equipment (15, 16) is provided, with each of which at least one detecting device (4, 5, 6, 7, 8, 9) of the monitoring device (2) is associated, that the detecting devices (4, 5, 6, 7, 8, 9) are connected with a control device (3) by way of a bus system (10) and that at least one energy store (22, 22') is locally arranged at each detecting device (4, 5, 6, 7, 8, 9).
11. Method of monitoring a transport installation (1) for persons, which installation is designed as a elevator, escalator or moving walkway, wherein external actuation of at least one item of equipment (15, 16) of the transport installation (1) for persons is detected by means of a detecting device (4, 5, 6, 7, 8, 9), wherein an energy store (22, 22'), which serves for storage of electrical energy, is transferred to a charged state and wherein the energy store (22, 22') is transferred to a discharged state when external actuation of the item of equipment (15, 16) is detected, characterised in that the discharged state of the energy store (22, 22') also represents external actuation when the item of equipment has re-adopted the original start state thereof.
12. Method according to claim 11, wherein on interruption of an external energy supply (12) of the transport installation (1) for persons the energy store (22, 22') is transferred to a discharged state when the detecting device (4, 5, 6, 7, 8, 9) detects external actuation of the items of equipment (15, 16) and that a control device (3) of the transport installation (1) for persons after restoration of the external energy supply (12) switches to a special operating state if the energy store (22, 22') is in the discharged state.
13. Method according to claim 12, wherein the control device (3) when an external energy supply (12) is present transfers the energy store (22, 22') from the discharged state to the charged state only if the detecting device (4, 5, 6, 7, 8, 9) does not detect external actuation of the item of equipment (15, 16) of the transport installation (1) for persons.
14. Method according to claim 12 or 13, wherein the control device (3) when an external energy supply (12) is present transfers the energy store (22, 22') from the discharged state to the charged state only if the control device (3) blocks transport of persons by the transport installation (1) for persons in the special operating state and manual release is carried out.

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