Monitoring device for a door function unit

Abstract

The invention relates to a monitoring device (1) for a door function unit, in particular a door closer (2), door drive, door lock (106) or door holding system (105), comprising a sensor unit (10) designed for arrangement in the door function unit, with a first magnetic sensor (11) and an associated encoder (12), wherein the sensor unit (10) is designed and configured to detect a position of a movable functional element of the door function unit, and at least a second magnetic sensor (14) which is designed and configured to detect an external magnetic field for monitoring the operation of the first magnetic sensor (11).

Description

[0001] The invention relates to a monitoring device for a door function unit. The door function unit is, for example, a door closer, a door drive, a door lock, or a door holding system.

[0002] EP 3 315 704 A1 discloses a system for monitoring safety-relevant functions of a door closer. Using a combination of position and acceleration signals, the system checks whether the door closer has been broken or tampered with. For example, it can detect whether a lever connected to the output shaft of the door closer has been disengaged.

[0003] The object of the present invention is to provide a monitoring device for a door functional unit which enables the safe use of a door with simple means, in particular simple manufacture and low-maintenance operation.

[0004] The problem is solved by the features of the independent claim. The dependent claims relate to preferred embodiments of the invention.

[0005] The invention relates to a monitoring device for a door function unit. The door function unit is in particular a door closer, a door drive, a door lock or a door holding system.

[0006] The monitoring device comprises a sensor unit. The sensor unit is designed for installation within the door functional unit. The sensor unit includes a first magnetic sensor and an associated encoder. The sensor unit is designed and configured to detect the position of a movable functional element of the door functional unit. For this purpose, the encoder is specifically arranged or integrated on the functional element. As will be described in more detail below, the door functional unit can, for example, be a door closer, with the encoder integrated or integrated on the output shaft of the door closer. Regardless of the specific design of the door functional unit, it is preferably provided that the encoder is a separate component that is arranged, and in particular attached, to the functional element.Alternatively, the functional element or a portion thereof can be configured such that the functional element itself, or the appropriately configured portion, acts as a sensor. The sensor is preferably a permanent magnet.

[0007] Preferably, the first magnetic sensor is designed and arranged for detecting the encoder, particularly without contact. Most preferably, the first magnetic sensor is designed to detect the position and / or rotation and / or acceleration of the encoder.

[0008] The sensor unit can thus detect how the functional element of the door unit moves and / or its position. This makes it possible to monitor the proper functioning of the door unit. Within the scope of the invention, it was discovered that the first magnetic sensor of the sensor unit can be influenced, and in particular disrupted, by external magnetic fields, either intentionally or unintentionally. Intentional, and especially manipulative, influence on the first magnetic sensor can be achieved, for example, by placing a sufficiently strong magnet in the immediate vicinity of the door unit. In the present embodiment, such a magnetic field is referred to as a "manipulative external magnetic field."Furthermore, it is also possible that a magnetic field is temporarily or permanently present near the installation location of the door function unit, for example, due to an elevator passing close to the door function unit or due to electrical lines. Magnetic fields generated in this way are referred to here as "non-manipulative magnetic fields".

[0009] The invention provides that the monitoring device comprises at least one second magnetic sensor. This second magnetic sensor is designed and configured to monitor the operation of the first magnetic sensor by detecting an external magnetic field. According to the invention, by considering the signals from the second magnetic sensor, it is possible to determine whether an external magnetic field is present and, in particular, what its characteristics are, such as its temporal profile or strength. Based on this, it can be determined whether the external magnetic field is, for example, manipulative or non-manipulative. Furthermore, the information acquired by the second magnetic sensor can be used to determine whether the external magnetic field has a correspondingly disruptive effect on the sensor unit.

[0010] Preferably, the at least one second magnetic sensor is designed for arrangement in the door function unit. Particularly preferably, the monitoring device comprises the door function unit. It is especially preferred that the sensor unit and / or the at least one second magnetic sensor is / are arranged in the door function unit.

[0011] Preferably, the door function unit comprises a cover and / or a support. The cover could, for example, be the cover of a door closer. The support could, for example, be a mounting plate. The first magnetic sensor and / or the at least one second magnetic sensor is / are preferably arranged under the cover and / or located on the support.

[0012] A permanent magnet is preferably attached to the trim panel. This has the advantage that the permanent magnet on the trim panel can detect whether the trim panel is being moved relative to the first magnetic sensor and / or relative to at least one second magnetic sensor. If the trim panel is removed, for example by tampering with the door control units, the permanent magnet on the trim panel moves relative to the first magnetic sensor and / or relative to at least one second magnetic sensor, which can be detected by the signals from the magnetic sensors. This allows, for example, a corresponding message or alarm to be triggered.

[0013] Preferably, the monitoring device comprises a circuit board. The circuit board is located, in particular, in or on the door function unit. Specifically, the circuit board is located under the described cover. It is preferably provided that the first magnetic sensor and at least one second magnetic sensor are arranged on the circuit board.

[0014] Preferably, the monitoring device comprises two of the described second magnetic sensors. The two second magnetic sensors are located on opposite sides of the first magnetic sensor. This provides redundancy, for example, in the event of a failure of one of the second magnetic sensors. Furthermore, this arrangement allows the device to detect on which side the external magnetic field is located, or from which side the external magnetic field is acting on the first magnetic sensor.

[0015] According to a first embodiment, it is preferably provided that the at least one second magnetic sensor, and in particular all second magnetic sensors, are arranged within the influence area of ​​the sensor unit. According to an alternative definition, the distance between the sensor unit's encoder and the nearest second magnetic sensor is at most 5 cm, preferably at most 3 cm. In this arrangement, the encoder of the sensor unit influences the at least one second magnetic sensor. This influence on the signals at the at least one second magnetic sensor by the encoder can be taken into account in the corresponding control arrangement, so that the external magnetic field can be identified despite this influence. Furthermore, this relatively close arrangement of the magnetic sensors to each other has the advantage that the at least one second magnetic sensor can redundantly replace or supplement the first magnetic sensor.Because the signals at at least one second magnetic sensor are influenced by the encoder, it is also possible to use the signals at at least one second magnetic sensor to detect the position, speed or movement of the encoder.

[0016] According to a second embodiment, it is preferably provided that the at least one second magnetic sensor, and in particular all second magnetic sensors, are located outside the influence area of ​​the sensor unit. In an alternative definition, it is provided that the distance between the transmitter and the nearest second magnetic sensor is at least 6 cm, preferably at least 8 cm. In this configuration, the at least one second magnetic sensor is not influenced by the transmitter, or only in an irrelevant way, so that the signals generated at the second magnetic sensor can be clearly attributed to an external magnetic field.

[0017] The following embodiments are preferably provided for the precise design of the first magnetic sensor and / or the at least one second magnetic sensor: The respective magnetic sensor is preferably a Hall sensor, an inductive sensor, or a reed switch. Furthermore, it is provided that at least one of the magnetic sensors is designed such that its function is based on magnetoresistance.

[0018] Due to its relatively simple design, the reed switch can indicate the presence or absence of a magnetic field, such as an external magnetic field. While it cannot determine the precise characteristics of the magnetic field, this is not strictly necessary. If a reed switch is used as a second magnetic sensor, it can indicate whether a corresponding external magnetic field of sufficient strength is present. This can generally be sufficient to determine whether the sensor unit is functioning correctly. Furthermore, the reed switch can be used to easily detect the optional permanent magnet on the cover. If the cover with the permanent magnet is removed, the reed switch can detect this and, for example, issue a corresponding message.

[0019] As mentioned at the outset, the door function unit of the monitoring device is preferably designed as a door closer. The door function unit comprises a housing and an output shaft mounted therein as the functional element. Furthermore, a mechanical energy storage device is located in the housing, which imparts rotation to the output shaft, particularly in the closing direction of the door. The energy storage device is preferably designed as a spring. The sensor unit's encoder is located on the output shaft or is integrated into the output shaft accordingly. The sensor unit is designed to detect the actual rotation angle of the output shaft. The output shaft is rotatable about an axis of rotation.

[0020] The output shaft of the door closer assembly is specifically designed for attaching a lever assembly. In one mounting option, the door closer can be mounted on the door, specifically the door leaf. The lever assembly then forms the connection to the wall. For example, a guide rail of the lever assembly is attached to the wall. In a second mounting option, the door closer can be mounted on the wall. The lever assembly then forms the connection between the door closer and the door leaf. For example, the guide rail of the lever assembly is attached to the door leaf. The term "wall" here also includes the door frame.

[0021] The energy storage device's spring is specifically a coil spring. The energy storage device is located within the housing and exerts force on the output shaft, causing it to rotate in a closing direction.

[0022] The output shaft rotates in the closing direction, particularly when the door closer is properly installed to close a door and the door is closing. When the door is opened, the output shaft rotates in the opposite direction, also known as the opening direction. The door closer is preferably designed without a drive mechanism, meaning it is not a motor-driven door operator. However, as described earlier, the door operating unit can also be designed as a door operator. In a door operator, just like in a door closer, an output shaft is provided, which is connected to the guide rail, for example, via a lever arrangement. However, in this case, the output shaft is moved in both directions of rotation within the door operator, for example, electronically or hydraulically.In door drives, the sensor can also be located on the output shaft, for example, to detect its rotation. The sensor unit, particularly on the door closer, allows for the simple detection of the output shaft's position and / or movement. This information allows conclusions to be drawn about the door closer's proper function, ensuring safe door operation. For instance, it can detect whether the door is open or closed. Furthermore, it can detect whether the lever mechanism is damaged or tampered with.

[0023] When designing the door function unit as a door closer, it is preferably provided that the first magnetic sensor is located on the front side of the

[0024] The output shaft is positioned. Preferably, the axis of rotation of the output shaft intersects the first magnetic sensor and / or the encoder.

[0025] As mentioned at the beginning, the door function unit can also be designed as a door hold-open device or a door lock. A door hold-open device, for example, is located in the guide rail and holds the lever assembly in a specific position, particularly in the open position. The door hold-open device contains moving elements, referred to here as functional elements, whose position and / or movement can be detected by the described sensor unit. If the door function unit is designed as a door lock, it is also readily apparent that the door lock contains moving parts, such as a latch or bolt, whose movement and / or position can be detected by the described sensor unit.In both variants, both with the door holding system and with the door lock, an external magnetic field can be detected by means of at least one second magnetic sensor described here, from which appropriate conclusions can be drawn about the proper operation of the sensor unit.

[0026] The monitoring device preferably comprises a control arrangement. The control arrangement can generally consist of one or more control units or other types of computing units. The control unit can be fully integrated into the door function unit. However, it is also possible to arrange the control arrangement partially or completely outside the door function unit, for example, near the door, in a building control center, or in a cloud. If the control arrangement is distributed across several control units and / or other computing units, these are preferably networked with each other for data exchange.

[0027] To monitor the operation of the first magnetic sensor using the control arrangement, the control arrangement is configured as follows: The control arrangement is designed to validate at least one value based on the detected position of the functional element by the first magnetic sensor, wherein the validation is based on the detected values ​​of at least one second magnetic sensor. During the "validation" using the control arrangement, it is determined, in particular, whether the signals from the first magnetic sensor, i.e., the detected position of the functional element, are correct or incorrect. For this purpose, validation is performed based on the detected values ​​of the at least one second magnetic sensor. Specifically, the external magnetic field is detected and evaluated using the second magnetic sensor.

[0028] Additionally or alternatively, the control arrangement is designed to check whether the sensor unit has been manipulated by an external magnetic field, with the check being based on the measured values ​​of at least one magnetic sensor. The "check" takes into account that not every external magnetic field is caused by manipulation. For example, electrical lines or nearby elevators can influence the magnetic field, which in this case is to be classified as "non-manipulative." However, a magnet intentionally brought near the door function unit can also create a "manipulative external magnetic field." Depending on whether a non-manipulative or a manipulative external magnetic field is present, different further steps may need to be initiated, such as checking the door function unit or triggering an alarm.

[0029] Furthermore, it is preferably provided that the control arrangement is configured to acquire and store ground state data. This ground state data is based on the signals of the first magnetic sensor and / or at least one second magnetic sensor without an external magnetic field. The ground state data is thus acquired during a state in which it is ensured that no external magnetic field is present. The ground state data can be used in the control arrangement to identify and characterize detected external magnetic fields. For example, when evaluating the signals of the at least one second magnetic sensor, it can be taken into account which portions of the signals, based on the ground state data, cannot be attributed to an external magnetic field.

[0030] Preferably, the control arrangement is configured to store and / or retrieve external magnetic field comparison data sets. "Retrieval" in this context means, in particular, that these data sets do not need to be stored in the control arrangement itself, but can be retrieved from a unit networked with the control arrangement, for example, an external storage device. The external magnetic field comparison data sets preferably contain data on the duration and / or strength and / or patterns of external magnetic fields.

[0031] Furthermore, it is preferably provided that the control arrangement is designed to classify the detected external magnetic field into interfering and non-interfering external magnetic fields. This classification is based, in particular, on the external magnetic field comparison data sets. The described validation is then based on the classification into interfering / non-interfering external magnetic fields. For example, it can be taken into account that an external magnetic field is detected, but this field has no or no significant interfering effect on the sensor unit. If an external magnetic field is classified as a non-interfering magnetic field, the signals from the sensor unit can still be relied upon. However, if it is a interfering magnetic field, it must be considered that the position of the functional element detected by the sensor unit may be incorrect.

[0032] Furthermore, the control arrangement is preferably designed to classify the detected external magnetic field into manipulative and non-manipulative external magnetic fields. This classification is also preferably based on the external magnetic field comparison data sets. The described test is then based on this classification into manipulative / non-manipulative external magnetic fields.

[0033] The described validation and testing, or the consideration of at least four categories (interfering / non-interfering external magnetic fields and manipulative / non-manipulative external magnetic fields), has the following advantage: regardless of whether an external magnetic field is manipulative or non-manipulative, it can be either disruptive or non-interfering. If it is a non-interfering external magnetic field, the control system can continue to rely on the signals from the sensor unit, which is not the case with disruptive external magnetic fields. Regardless of whether the external magnetic field is disruptive or non-interfering, it can also be a manipulative external magnetic field. In the case of a manipulative external magnetic field, further steps may be necessary, such as triggering an alarm or checking the immediate vicinity of the door control unit.

[0034] The external magnetic field comparison data sets can be generated in various ways. For example, it is possible to predefine these data sets for specific locations of the door function unit or for the door function unit itself and make them available according to the control arrangement. In this way, the external magnetic field comparison data sets can, for instance, take into account that if a very strong and persistent external magnetic field is present, there is a relatively high probability that a permanent magnet has been tampered with in the door function unit.

[0035] However, within the scope of the invention, it is preferably also provided that the control arrangement is configured in a learning mode as follows: first, an external magnetic field is detected by means of the at least one magnetic sensor to generate external magnetic field comparison data sets. For this purpose, for example, a strong permanent magnet is brought near the door function unit to simulate a manipulative external magnetic field. Alternatively, for example, a nearby electrical conductor can also be activated accordingly to simulate a potentially disruptive but non-manipulative external magnetic field.

[0036] In the next step of the learning mode, the detected external magnetic field is categorized. For example, a person, a database, or an artificial intelligence is asked whether the detected external magnetic field is disruptive or non-disruptive, and / or whether it is manipulative or non-manipulative.

[0037] The next step involves saving the foreign magnetic field comparison data set with the corresponding classification.

[0038] The control arrangement is further configured to output a corresponding signal to another arrangement, the signal being based on the result of the described validation and / or the result of the described test. The "other arrangement" can be any technical device connected to the control arrangement for data exchange. For example, the other arrangement could be a building control center, a loudspeaker, a visual display, a cloud server, or a mobile phone.

[0039] Furthermore, the control arrangement is preferably designed to output a message perceptible to a person, wherein the message is based on the result of the validation and / or the result of the test. The control arrangement can therefore include appropriate means for outputting such a message; for example, the control arrangement can include a loudspeaker and / or optical output means.

[0040] Furthermore, the control arrangement is preferably configured to store a value in a memory, wherein the stored value is based on the result of the validation and / or the test. For example, the validation and / or the test can be logged.

[0041] The first magnetic sensor and the at least one second magnetic sensor are preferably arranged to detect the encoder, wherein the control arrangement is configured to take the detected values ​​of the first magnetic sensor into account during validation and / or testing, in particular to subtract at least part of them from the detected values ​​of the at least one second magnetic sensor. This is particularly important when the at least one second magnetic sensor is located within the encoder's range of influence. The encoder's influence on the at least one second magnetic sensor can thus be taken into account by using the signals from the first magnetic sensor.

[0042] The present invention further discloses a method for monitoring a door functional unit. In particular, the method is designed for operating the monitoring device defined above and in the claims.

[0043] In particular, a method for operating the described monitoring device is disclosed, comprising at least the following steps: detecting the position of the movable functional element of the door function unit with the sensor unit; and detecting the external magnetic field with at least one second magnetic sensor for monitoring the operation of the first magnetic sensor.

[0044] Preferably, the method comprises the following steps, which are carried out by means of the control arrangement: validating at least one value based on the detected position of the functional element with the first magnetic sensor, wherein the validation is based on the detected values ​​of the at least one second magnetic sensor; and / or checking whether the sensor unit has been manipulated by an external magnetic field, wherein the check is based on the detected values ​​of the at least one second magnetic sensor; and preferably storing ground state data based on signals from the first magnetic sensor and / or the at least one second magnetic sensor without an external magnetic field.

[0045] Preferably, the method comprises the following steps, which are carried out by means of the control arrangement: storing and / or retrieving external magnetic field comparison data sets, classifying the detected external magnetic field into interfering and non-interfering external magnetic fields based on the external magnetic field comparison data sets, wherein the subsequent validation is based on the classification into interfering / non-interfering external magnetic fields, and / or classifying the detected external magnetic field into manipulative and non-manipulative external magnetic fields based on the external magnetic field comparison data sets, wherein the subsequent check is based on the classification into manipulative / non-manipulative external magnetic fields.

[0046] Preferably, the method comprises the following steps, which are carried out by means of the control arrangement: detecting an external magnetic field using at least one second magnetic sensor to generate external magnetic field comparison data sets, querying a classification of the detected external magnetic field into disturbing / non-disturbing external magnetic fields and / or into manipulative / non-manipulative external magnetic fields, and storing the external magnetic field comparison data set with the corresponding classification.

[0047] Preferably, the method comprises the following steps, which are carried out by means of the control arrangement: outputting a signal to another arrangement, wherein the signal is based on the result of the validation and / or on the result of the test, and / or outputting a message perceptible to a person, wherein the message is based on the result of the validation and / or on the result of the test, and / or storing a value in a memory, wherein the stored value is based on the result of the validation and / or on the result of the test.

[0048] Preferably, the method comprises the following steps, which are carried out by means of the control arrangement, wherein the first magnetic sensor and the at least one second magnetic sensor are arranged for detecting the encoder: during validation and / or testing, the detected values ​​of the first magnetic sensor are taken into account, in particular at least partially subtracted from the detected values ​​of the at least one second magnetic sensor.

[0049] The invention will now be described in more detail using an exemplary embodiment. The following are shown: Fig. 1 a schematic view of a monitoring device according to the invention in an exemplary embodiment, Fig. 2 a view of a closed door functional unit, designed as a door closer, of the monitoring device according to the exemplary embodiment, Fig. 3 an exploded view of Fig. 2 , Fig. 4 the in Figures 2 and 3 The door functional unit shown is without trim and is shown in Fig. 5. Fig. 2marked section AA.

[0050] Fig. 1 Figure 1 shows a door 100 with a door frame 101 in which a door leaf 102 of a swing door is located. A door closer 2 is located on the door leaf 102. A guide rail 103 is arranged on the door frame 101. The door closer 2 is actuated via its output shaft 8 (see Figure 101). Fig. 2 ff.) connected to a lever assembly 104. The lever assembly 104 slides in the guide rail 103.

[0051] Furthermore, it shows Fig. 1 In purely schematic terms, a door holding device 105 can be located in the guide rail 103. A door lock 106 can be located in the door leaf 102.

[0052] Fig. 1Figure 1 further shows a monitoring device 1. As explained in the general part of the description, the monitoring device 1 is designed for a door function unit; in particular, the door function unit is a component of the monitoring device 1. The door function unit can be, for example, the door closer 2, the door hold-open device 105, or the door lock 106. It has also been described that the door function unit can also be designed as a door drive. Such a door drive is located, for example, on the door frame 101. In the following, the door function unit is described in more detail as a door closer 2.

[0053] How Fig. 1 As schematically illustrated, the monitoring device 1 comprises, in addition to the door function unit, here designed as a door closer 2, a control arrangement 3. This control arrangement 3 can be divided among different control units or computing units. This is shown in Fig. 1This is schematically represented by showing that part of the control arrangement 3 is located on or in the door closer 2, and another part of the control arrangement 3 is located outside the door 100. The different areas of the control arrangement 3 are connected to each other for data exchange, for example wirelessly or via a wired connection.

[0054] Fig. 1 This further clarifies that an additional arrangement 200 can be provided, which is connected to the control arrangement 3 for data exchange. The control arrangement 3 can, for example, output corresponding signals to this additional arrangement 200.

[0055] Figs. 2 to 5 The figures illustrate the structure of the door function unit, here designed as a door closer 2, and the monitoring device 1. In the following, reference is always made to all figures unless otherwise stated in individual cases.

[0056] The Figures 2 to 5The figures show that the door closer 2 comprises a support 5, for example, a mounting plate. A housing 6 of the door closer 2 is mounted on this support 5. The housing 6 is made of metal. An output shaft 8, referred to in the general part of the description as a functional element, is rotatably mounted in the housing 6. The output shaft 8 rotates about an axis of rotation 9.

[0057] As explained in the general section of the description, the housing 6 contains an energy storage device, specifically a spring. When the door is opened, the lever assembly 104 rotates the output shaft 8 accordingly, thereby charging the energy storage device inside the housing 6. When the door is closed, the energy storage device inside the housing 6 relaxes, rotating the output shaft 8 in the opposite direction.

[0058] Fig. 3shows that the door closer 2 can include a battery pack 7, which can supply power to electronic components within the door closer 2 or the entire monitoring device 1.

[0059] The door closer 2 also includes a cover 4. The cover 4 can be attached, for example, to the support 5 and / or to the housing 6. The cover 4 covers the housing 6 at least partially, and in particular completely.

[0060] Fig. 4 This illustrates that a sensor unit 10 is arranged at the end face of the output shaft 8. The sectional view in [reference to sectional view] shows the more detailed structure of the sensor unit 10. Fig. 5Accordingly, the sensor unit 10 comprises a first magnetic sensor 11 and an encoder 12. In the illustrated embodiment, the encoder 12 is a permanent magnet arranged at the end face of the output shaft 8. The first magnetic sensor 11 is spaced apart from this encoder 12 and detects the movement of the encoder 12. The axis of rotation 9 intersects both the encoder 12 and the first magnetic sensor 11.

[0061] The first magnetic sensor 11 is located on a circuit board 13. Two second magnetic sensors 14 are arranged on this circuit board 13. The illustrated embodiment clarifies Fig. 5 , that not only a second magnetic sensor 14, but for example two second magnetic sensors 14 can be used on different sides of the first magnetic sensor 11.

[0062] Fig. 3The diagram schematically illustrates that a permanent magnet 15 can be located on the cover 4. As explained in the general section of the description, this makes it possible to detect when the cover 4 is removed using one of the magnetic sensors 11, 14.

[0063] The exemplary embodiment thus shows the monitoring device 1 with the door closer 2. The sensor unit 10 is designed for arrangement in the door closer 2, wherein the position of the output shaft 8 can be detected by means of the first magnetic sensor 11 and the associated encoder 12, and thus by means of the sensor unit 10. The at least one second magnetic sensor 14 is designed and configured to monitor the operation of the first magnetic sensor 11 by detecting an external magnetic field.

[0064] In the illustrated embodiment, both the sensor unit 10 and the at least one second magnetic sensor 14 are arranged in the door closer 1. The first magnetic sensor 11 and the at least one second magnetic sensor 14 are arranged under the cover 4 and are located, for example, on the support 5.

[0065] In the illustrated embodiment, the at least one second magnetic sensor 14 can be arranged both within the influence area of ​​the sensor unit 10 and outside this influence area.

[0066] As explained in the general part of the description, the first magnetic sensor 11 and / or at least one second magnetic sensor 14 can be designed as a Hall sensor, inductive sensor, reed switch or as a magnetic sensor whose function is based on giant magnetoresistance.

[0067] The control arrangement 3 shown in the exemplary embodiment is designed for monitoring the operation of the first magnetic sensor 11, in particular for the following purposes: validating at least one value based on the detected position of the output shaft 8 with the first magnetic sensor 11, wherein the validation is based on the detected values ​​of the at least one second magnetic sensor 14; and / or checking whether the sensor unit 10 has been manipulated by an external magnetic field, wherein the check is based on the detected values ​​of the at least one second magnetic sensor 14. Furthermore, the control arrangement 3 can store the basic state data described in the general part of the description.

[0068] The control arrangement 3 shown in the exemplary embodiment is preferably configured to: store and / or retrieve external magnetic field comparison data sets, classify the detected external magnetic field into interfering external magnetic fields and non-interfering external magnetic fields based on the external magnetic field comparison data sets, wherein the subsequent validation is based on this classification, and / or classify the detected external magnetic field into manipulative external magnetic fields and non-manipulative external magnetic fields based on the external magnetic field comparison data sets, wherein the subsequent testing is based on this classification.

[0069] Furthermore, the control arrangement 3 shown in the exemplary embodiment is configured for the learning mode, as defined in the general part of the description.

[0070] The control arrangement 3 shown in the embodiment can be configured to: output a signal to the further arrangement 200, wherein the signal is based on the result of the validation and / or testing; and / or output a message perceptible to a person, wherein the message is based on the result of the validation and / or testing; and / or store a value in a memory, wherein the stored value is based on the result of the validation and / or testing.

[0071] Furthermore, the control arrangement 3 shown in the exemplary embodiment can be configured to take into account the detected values ​​of the first magnetic sensor 11 during validation and / or testing, in particular to subtract at least partially from the detected values ​​of the at least one second magnetic sensor 14. Reference symbol list

[0072] 1 Monitoring device 2 Door closer (door function unit) 3 Control assembly 4 Cover 5 Carrier 6 Housing 7 Battery pack 8 Output shaft (functional element) 9 Rotary axis 10 Sensor unit 11 First magnetic sensor 12 Transmitter 13 Circuit board 14 Second magnetic sensor(s) 15 Permanent magnet 100 Door 101 Door frame 102 Door leaf 103 Guide rail 104 Lever assembly 105 Door hold-open device 106 Door lock 200 further arrangement

Claims

1. Monitoring device (1) for a door function unit, in particular a door closer (2), door drive, door lock (106) or door holding system (105), comprising: • a sensor unit (10), designed for arrangement in the door function unit, with a first magnetic sensor (11) and an associated transmitter (12), wherein the sensor unit (10) is designed and configured to detect a position of a movable functional element of the door function unit, • and at least a second magnetic sensor (14), which is designed and configured to detect an external magnetic field for monitoring the operation of the first magnetic sensor (11).

2. Monitoring device according to claim 1, wherein the at least one second magnetic sensor (14) is designed for arrangement in the door functional unit.

3. Monitoring device according to one of the preceding claims, comprising the door function unit, • wherein the sensor unit (10) and / or the at least one second magnetic sensor (14) is / are arranged in the door function unit; • preferably wherein the door function unit comprises a cover (4) and / or a carrier (5), wherein the first magnetic sensor (11) and / or the at least one second magnetic sensor (14) is / are arranged under the cover (4) and / or on the carrier (5), • preferably wherein a permanent magnet (15) is arranged on the cover (4) so ​​that a movement of the cover (4) relative to the first magnetic sensor (11) and / or relative to the at least one second magnetic sensor (14) can be detected.

4. Monitoring device according to one of the preceding claims, comprising a circuit board (13), wherein the first magnetic sensor (11) and the at least one second magnetic sensor (14) are arranged on the circuit board (13).

5. Monitoring device according to one of the preceding claims, comprising at least two of the second magnetic sensors (14) arranged on different sides of the first magnetic sensor (11).

6. Monitoring device according to one of the preceding claims, wherein the at least one second magnetic sensor (14), in particular all second magnetic sensors (14), is / are arranged in an influence area of ​​the sensor unit (10); and / or wherein the distance between the transmitter (12) and the nearest second magnetic sensor (14) is at most 5 cm, preferably at most 3 cm.

7. Monitoring device according to one of claims 1 to 5, wherein the at least one second magnetic sensor (14), in particular all second magnetic sensors (14), is / are arranged outside an influence area of ​​the sensor unit (10); and / or wherein the distance between the transmitter (12) and the nearest second magnetic sensor (14) is at least 6 cm, preferably at least 8 cm.

8. Monitoring device according to one of the preceding claims, wherein the first magnetic sensor (11) is: • designed as a Hall sensor, • or designed as a magnetic sensor whose function is based on giant magnetoresistance, • or designed as an inductive sensor, • or designed as a reed switch; and / or wherein the at least one second magnetic sensor (14) is: • designed as a Hall sensor, • or designed as a magnetic sensor whose function is based on giant magnetoresistance, • or designed as an inductive sensor, • or designed as a reed switch; 9. Monitoring device according to one of claims 3 to 8, wherein the door function unit is designed as a door closer (2), the door function unit comprising: • a housing (6) and an output shaft (8) mounted therein as the functional element, • and a mechanical energy storage device in the housing (6) which causes the output shaft (8) to rotate, wherein the energy storage device is preferably designed as a spring; • wherein the encoder (12) of the sensor unit (10) is arranged or formed on the output shaft (8); • wherein the sensor unit (10) is designed to detect an actual rotation angle of the output shaft (8).

10. Monitoring device according to claim 9, wherein the first magnetic sensor (11) is positioned at the end face of the output shaft (8); preferably wherein the axis of rotation (9) of the output shaft (8) intersects the first magnetic sensor (11) and / or the encoder (12).

11. Monitoring device according to one of the preceding claims, comprising a control arrangement (3) configured for monitoring the operation of the first magnetic sensor (11) to: • validate at least one value based on the detected position of the functional element with the first magnetic sensor (11), wherein the validation is based on the detected values ​​of the at least one second magnetic sensor (14), • and / or check whether manipulation of the sensor unit (10) by an external magnetic field is present, wherein the check is based on the detected values ​​of the at least one second magnetic sensor (14), • and preferably store ground state data based on signals from the first magnetic sensor (11) and / or the at least one second magnetic sensor (14) without an external magnetic field.

12. Monitoring device according to one of claims 11, wherein the control arrangement (3) is configured to: • store and / or retrieve external magnetic field comparison data sets, • classify the detected external magnetic field based on the external magnetic field comparison data sets into interfering external magnetic fields and non-interfering external magnetic fields, wherein the subsequent validation is based on the classification into interfering / non-interfering external magnetic fields, • and / or classify the detected external magnetic field based on the external magnetic field comparison data sets into manipulative external magnetic fields and non-manipulative external magnetic fields, wherein the subsequent testing is based on the classification into manipulative / non-manipulative external magnetic fields.

13. Monitoring device according to claim 12, wherein the control arrangement (3) is configured in a learning mode to: • detect an external magnetic field by means of the at least one second magnetic sensor (14) to generate external magnetic field comparison data sets, • query a classification of the detected external magnetic field into disturbing / non-disturbing external magnetic fields and / or into manipulative / non-manipulative external magnetic fields, • and store the external magnetic field comparison data set with the associated classification.

14. Monitoring device according to one of claims 11 to 13, wherein the control arrangement (3) is configured to: • output a signal to a further arrangement (200), wherein the signal is based on the result of the validation and / or on the result of the test, • and / or output a message perceptible to a person, wherein the message is based on the result of the validation and / or on the result of the test, • and / or store a value in a memory, wherein the stored value is based on the result of the validation and / or on the result of the test.

15. Monitoring device according to one of claims 11 to 14, wherein the first magnetic sensor (11) and the at least one second magnetic sensor (14) are arranged for detecting the encoder (12), wherein the control arrangement (3) is configured to take into account the detected values ​​of the first magnetic sensor (11) during validation and / or testing, in particular to subtract at least partially from the detected values ​​of the at least one second magnetic sensor (14).

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