Door drive, door system and control method for a door drive

Abstract

The present invention relates to a door drive (10) comprising a drive unit (22) configured to drive a movable door leaf (12) in servo or automatic operation between a closed position (32) and an open position (34). Furthermore, the door drive (10) comprises a control unit (50) configured to generate a control signal upon receiving an input signal indicating an initial opening request of the door leaf (12), based on which the door leaf (12) is driven in servo or automatic operation between the closed position (32) and the open position (34) and held in the open position (34) for a first holding period. The control unit (50) is also configured to, in the event of a subsequent actuation process, receive a further input signal indicating a further opening request of the door leaf (12),After the door leaf (12) has been opened and is not yet back in the closed position (32), a control signal is generated on the basis of which the door leaf (12) is held in the open position (34) for a second holding period, wherein the control unit (50) has a normal operation and an emergency operation, and wherein (i) the first holding period and / or the second holding period in the emergency operation is shorter than in the normal operation and / or (ii) a permissible maximum number of re-actuation operations in the emergency operation is less than in the normal operation and / or (iii) a total holding period in the emergency operation is shorter than in the normal operation.

Description

[0001] The present invention relates to a door drive comprising a drive unit and a control unit. The invention also relates to a door system comprising a movable door leaf, a door drive, and at least one sensor. Furthermore, the invention relates to a control method for a door drive and a computer program for executing the control method.

[0002] Door drives are used to actively drive a movable door leaf from its closed position to its open position and, if necessary, to hold the door leaf in its open position for a certain holding period.

[0003] These types of door drives have a control unit that receives an input signal from at least one sensor in the door system indicating a person's request to open the door, evaluates this signal, and sends a corresponding control signal to the drive unit. This control signal causes the drive unit to generate torque to move the door leaf from the closed position to the open position.

[0004] Depending on the design and intended use, such door drives can be operated in either servo or automatic mode. Door drives that can be switched between servo and automatic modes are also known. Servo operation is characterized by a servo motor generating torque when a door handle or lever is actuated, enabling power-assisted opening of the door leaf, although manual force application by a person is still required. In contrast, automatic operation involves the door leaf opening independently, without any manual force being required.

[0005] Such door drives can be used for all types of doors, including swing, sliding and revolving doors, as well as security or fire doors.

[0006] The control unit of such door drives is typically designed to switch to emergency mode in the event of an emergency, such as a fire. During emergency mode, the control unit executes operation-dependent control commands for the door drive. These can, for example, activate an automatic closing movement, which is implemented, for instance, by a mechanical storage device or a spring, or prevent the door leaf from being held open. This is intended to prevent the door leaf from remaining open in the event of a fire, in order to prevent or at least delay the spread of fire and / or smoke as much as possible. While this is generally desirable with regard to the door's protective function in emergency mode, it presents a problem insofar as it can impede people attempting to escape.Doors with a high level of security often have relatively heavy door leaves, making it particularly difficult for weak or disabled people to pass through. Furthermore, there is a risk that such individuals could become trapped between the door leaf and the door frame and be unable to free themselves.

[0007] EP 3 983 633 B1 concerns an automatic door operator designed to open and close a door leaf and comprising an activation sensor and a control unit. The control unit has a normal operating mode and an emergency mode. In emergency mode, the control unit initially responds to a signal from the activation sensor, thereby opening the door leaf. However, once a predefined hold-open period has elapsed and a signal from the activation sensor is still present (for example, because a person continues to activate the sensor), the control unit ignores this false indication of continued activation.

[0008] Although ignoring a false indication of sustained activation of the activation sensor in emergency mode may seem advantageous in order to keep the holding period as short as possible, the automatic door drive described in EP 3 983 633 B1 has the disadvantage that fleeing persons, especially weak or disabled persons, may have difficulty passing through the open door leaf within the short holding period.

[0009] Ignoring a false indication of continued activation of the sensor in emergency mode further compromises the safety of those fleeing. During the closing movement, there is a risk that fleeing individuals, especially those who are weak or disabled, could be trapped and injured between the door leaf and the door frame. In this case, the door drive disclosed in EP 3 983 633 B1 prevents repeated activation of the sensor, thus preventing those fleeing from freeing themselves from this position.

[0010] Against this background, it is an object of the present invention to provide a door drive that overcomes the aforementioned disadvantages. In particular, it should enable people fleeing to pass through the door leaf more easily in emergency situations.

[0011] This problem is solved according to a first aspect of the present invention by a door drive comprising the following: a drive unit configured to drive a movable door leaf in servo or automatic operation between a closed position and an open position; and a control unit configured to generate a control signal upon receiving an input signal indicating an initial opening request of the door leaf, based on which the door leaf is driven in servo or automatic operation between the closed position and the open position and is held in the open position for an initial holding period, wherein the control unit is configured to generate a control signal in the event of a subsequent actuation process in which the control unit receives a further input signal indicating a further opening request of the door leaf after the door leaf has been opened and is not yet back in the closed position.Based on this, the door leaf is held in the open position for a second holding period, the control unit having a normal operation and an emergency operation, and wherein (i) the first holding period and / or second holding period in the emergency operation is shorter than in the normal operation and / or (ii) a permissible maximum number of re-actuation operations in the emergency operation is lower than in the normal operation and / or (iii) a total holding period in the emergency operation is shorter than in the normal operation.

[0012] According to the invention, in emergency mode, the control unit does not preclude a subsequent actuation process upon receiving a further input signal, but rather enables it to a limited extent. This allows the door leaf to be held in the open position for a second holding period. This enables people fleeing, especially those who are frail or disabled, to keep the door leaf open for a longer period in emergency mode, thus facilitating easier passage through the door leaf while simultaneously complying with fire safety regulations.

[0013] Advantageously, fleeing individuals who are still inside the doorway can trigger a re-opening action after the initial hold-open period has expired. This moves the door leaf back to the open position and then holds it there for the second hold-open period. This prevents fleeing individuals from becoming trapped between the door leaf and the door frame.

[0014] The initial opening request refers to the detection of a first input signal, generated by activating a sensor in the closed position of the door leaf, indicating a person's wish to open the door to allow passage. For example, manually pressing a button can generate the input signal. Alternatively, the input signal can also be generated by a presence or motion sensor that monitors objects and people in the doorway.

[0015] The drive unit can be of various designs, for example as an electric motor, a pneumatic or hydraulic drive. Upon receiving a control signal, the drive unit generates a torque that drives the door leaf from the closed to the open position, either in an automatic mode or in a servo mode, depending on the design.

[0016] The hold-open period refers to a duration or length of time. The hold-open period(s) is a defined period or periods that are stored in the control unit or its associated storage unit.

[0017] In this context, the period during which the door leaf is held open immediately after opening is referred to as the "first hold-open period." Subsequent periods following this first hold-open period, initiated by a subsequent actuation process, are referred to as "second hold-open periods."

[0018] According to the invention, it can be provided that the first holding period and / or the second holding period in emergency operation is shorter than in normal operation, but not equal to zero, in order to move the door leaf more quickly (i.e. faster in time) into the closed position so that the protective function of the door leaf is restored.

[0019] Alternatively or additionally, the preferred maximum number of permissible re-actuation operations in emergency mode is at least one, and particularly preferably two, three, four, or five. In other words, the control device is configured, for example, to permit only one re-actuation operation, or alternatively only two, three, four, or five re-actuation operations, in emergency mode. Further re-actuation operations are prevented, for example, by ignoring further input signals from the control unit after a predefined number of re-actuation operations.

[0020] Reducing the maximum permitted number of re-actuation operations in emergency mode is designed to prevent the door leaf from being held open for an extended period, thereby preserving the protective function of the door.

[0021] Alternatively or additionally, the invention provides that the total holding period in emergency operation is shorter than in normal operation. The total holding period is defined as the sum of the first holding period and the sum of the second holding periods. In other words, the total holding period describes the maximum time the door leaf may remain in the open position.

[0022] The permissible total open time in emergency operation can be, for example, a maximum of 30 seconds, 45 seconds, 60 seconds, or 75 seconds. In normal operation, however, the permissible total open time can be unlimited.

[0023] Furthermore, technical defects, such as repeated contact interruptions (colloquially known as "loose connections") or broken wires, between the sensor and the control unit can unintentionally trigger numerous re-actuation processes. Shortening the overall hold-open time during emergency operation prevents the door leaf from remaining permanently open and thus quickly restores its protective function.

[0024] According to one embodiment, the control unit is designed to generate the control signal for the subsequent actuation process only when the further input signal is received after the first holding period has expired.

[0025] A follow-up operation for a further opening request of the door leaf can therefore only be triggered if the door leaf is either still in the open position or between the open and closed positions. Otherwise, it is a new initial opening request.

[0026] Advantageously, this prevents unintentional re-actuation before the end of the initial holding period. This ensures, particularly in emergency situations, that the permitted maximum number of re-actuations is not unintentionally used up.

[0027] According to a further embodiment, the control unit can be triggered in normal operation by an edge and / or by a level of the input signal and in emergency operation by an edge.

[0028] Advantageously, in emergency mode, the control unit is only triggered by an edge of the input signal to prevent a continuous input signal (level), e.g., generated by a short circuit or a defective sensor, from causing the control unit to generate a control signal that would unintentionally open or permanently hold the door open. For normal operation, however, level and / or edge control (either / or alternatively) can be implemented.

[0029] According to a further embodiment, a line monitoring circuit is set up to make the post-actuation process distinguishable from a short circuit for the control unit.

[0030] The line monitoring circuit is connected upstream of the control unit's input and to a sensor that triggers the post-actuation process. The line monitoring circuit conditions the sensor's input signal so that the control unit can reliably distinguish between a normal input signal and one caused by a short circuit.

[0031] According to a further embodiment, the maximum permitted number of re-actuation cycles and / or the total holding time are unlimited during normal operation. In contrast to emergency operation, normal operation is therefore not restricted, thus offering the user maximum flexibility.

[0032] According to a further embodiment, the initial hold-open period in emergency mode is shorter than in normal operation. In other words, the control unit can be configured such that the initial hold-open period in emergency mode is already shorter than in normal operation.

[0033] According to a further embodiment, the second holding period is the same length as, or shorter than, the first holding period. Thus, in the case of a subsequent actuation, the holding period can be the same length as the initial holding period that immediately follows the opening of the door leaf. Alternatively, the second holding period is somewhat shorter than the first holding period, but not zero.

[0034] According to a further embodiment, the door leaf is driven by the drive unit in servo or automatic operation between the closed position and the open position, and the door leaf is held in the open position by the drive unit and / or by a separate locking device.

[0035] The door leaf can be held open by the drive unit itself, but this is not mandatory. A separate holding device provided by the drive unit can also hold the door open. This holding device can be of various designs, such as mechanical, electromechanical, or electromagnetic.

[0036] According to a further embodiment, the control unit is configured to switch to emergency mode upon receiving an emergency signal. The control unit can receive the emergency signal from a connected sensor or from a central alarm unit.

[0037] A second aspect of the present invention relates to a door system with a movable door leaf, a door drive according to the invention and at least one sensor for generating the input signal.

[0038] According to one embodiment, the at least one sensor has a smoke detector configured to generate the emergency signal; an excessive heat detector configured to generate the emergency signal; and / or a communication interface configured to receive the emergency signal and transmit it to the control unit.

[0039] The sensors mentioned represent only a selection of possible detectors that can be used to generate the emergency signal. The range of sensors used is not exhaustive. For example, additional sensors for detecting gases, movements, or other safety-relevant events can be included.

[0040] According to a further embodiment, the at least one sensor has a first sensor and a second sensor, wherein the first sensor is designed as a push button or door handle detection sensor and the second sensor is designed as a radar, infrared, laser, LiDAR, ToF or ultrasonic sensor.

[0041] Furthermore, the sensors mentioned represent a selection that can be used to generate an input signal. It is intended that other sensors, not explicitly mentioned, can also be used. These include, for example, optical, acoustic, or other physical sensors suitable for detecting movements, actions, or other relevant parameters.

[0042] The term "door handle" refers to various designs of a door operating element, for example, a door handle or other lever-like or grip-like device for mechanically opening the door. The actuation of the door handle can be detected, for example, by a sensor integrated into the door handle or by a latch sensor. Both variants fall under the term "door handle detection sensor" used here.

[0043] According to another embodiment, the second sensor is deactivated in emergency mode.

[0044] This design ensures that the second sensor, which does not detect any mechanical activation by a person, does not generate an input signal during emergency operation. Particularly in the event of a fire, the second sensor could be falsely activated by smoke, fire, or other environmental conditions and generate an input signal.

[0045] A third aspect of the present invention relates to a control method for a door drive, comprising the steps: Receiving an input signal indicating an initial opening request for a door leaf; In response to the input signal, generating a control signal based on which the door leaf is driven in servo or automatic operation between a closed position and an open position and held in the open position for an initial holding period; Receiving a further input signal for a follow-up operation indicating a further opening request for the door leaf; In response to this further input signal, generating another control signal based on which the door leaf is held in the open position for a second holding period;and in response to an emergency signal, switching from normal operation to emergency operation, wherein the first hold-open period and / or second hold-open period in emergency operation is shorter than in normal operation and / or a permissible maximum number of re-actuation operations in emergency operation is lower than in normal operation and / or a total hold-open period in emergency operation is shorter than in normal operation.

[0046] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations and individually, without departing from the scope of the present invention. Furthermore, it is understood that the optional embodiments mentioned above apply not only to the door drive according to the first aspect of the invention, but also, in the same or equivalent manner, to the door system according to the second aspect of the invention and also to the control method for the door drive according to the third aspect of the invention or the computer program.

[0047] Exemplary embodiments of the invention are shown in the drawings and are explained in more detail in the following description. They show: Fig. 1 a schematic view of a door system according to an embodiment of the present invention; Fig. 2 a schematic representation illustrating an opening movement of a door leaf of the door system; Fig. 3 a schematic representation illustrating a closing movement of the door leaf; Fig. 4 a block diagram illustrating some exemplary components of the door drive; Fig. 5 a representation of a line monitoring circuit usable in the door system; and Fig. 6 a flowchart illustrating the control method according to the invention for the door drive;

[0048] Fig. 1Figure 1 shows a schematic front view of a door system 100 according to the invention, with a movable door leaf 12 which is attached to a door frame 14 via door hinges 16 and is rotatably mounted about a longitudinal axis 18 and can be driven by means of a door drive 10 according to the invention. The door hinges 16 allow movement of the door leaf 12 from a closed position to an open position and vice versa.

[0049] The door drive 10, which in this case is arranged at the upper end or above the door leaf 12, enables the door leaf 12 to be driven between the closed and open positions. In servo mode, a person who typically grasps the door using the door handle 20 is only assisted by the door drive 10, while in automatic mode, the door drive 10 moves the door leaf fully automatically to the open position.

[0050] The door drive 10 has a drive unit 22 by means of which the door leaf 12 can be driven. The drive unit 22 of the door drive 10 typically comprises an electric motor which is connected via a gearbox and a linkage 24 or a lever to a guide 26 attached to the door leaf 12. The drive unit 22 also includes an integrated spring 27. Typically, the drive unit 22 is mounted on the door frame 14 or the door jamb above the door leaf 12, but it can also be mounted below it and / or integrated into the door jamb or the door head. The door drive 10 also has a control unit 50 which is connected to the drive unit 22.

[0051] The door drive 10 can be triggered by several sensors in the door system 100. The sensors are designed to detect a person's request to open the door as they wish to pass through the door leaf 12. In this embodiment, a first sensor 29 is integrated into the door handle 20 and / or a push button 28 and detects manual operation by a person. This operation causes the door drive 10 to drive the door leaf 12 into the open position. The push button 28 can, for example, be a mechanical push button. The door handle 20 can, for example, be designed as a latch, knob, handle, or bar, and the sensor 29 can be integrated into it as a push button or contact sensor.

[0052] A second sensor 30 in the door system 100 also serves to detect a person's desire to open the door. For this purpose, the second sensor 30 detects an approaching person from a distance and / or the mere presence of the person, without requiring any manual interaction from the person. This triggers the door drive 10 to move the door leaf 12 into the open position. As described in Fig. 1 As shown, the at least one second sensor 30 can be arranged either directly on the door leaf 12 or on the door frame 14 or laterally next to or above the door frame 14. It is preferably designed as a radar, infrared, laser, LiDAR, ToF or ultrasonic sensor.

[0053] To prevent dangerous situations, a further sensor 31, which belongs to the group of second sensors 30 and is specifically designed as a safety sensor, can be arranged in the immediate vicinity of the door leaf 12 to monitor the presence and activity of persons and objects in the doorway. If a person or object is detected in the doorway, the further sensor 31 sends an input signal to the door drive 10 to prevent the door leaf 12 from moving towards the person or object and striking or trapping them. This sensor 31 specifically monitors the door gap between the door leaf 12 and the door frame 14 during the opening and closing movement.

[0054] Fig. 2Figure 1 shows the opening of the door leaf 12 in an embodiment of the door system 100 from a closed position 32 to an open position 34. The opening movement is indicated by the opening arrow 36. The door leaf angle α during the opening movement is, for example, 90° (or slightly more than 90°). In other embodiments, the door leaf angle α in the open position 34 may differ from 90°, for example, by approximately 180°.

[0055] In addition, it shows Fig. 3 The closing of the door leaf in an embodiment of door system 100 from an open position 34 to a closed position 32. The closing movement is indicated by the closing arrow 38. As in the Fig. 3As shown, an open door leaf angle α of approximately 90° (or slightly more than 90°) is reduced to 0° by the closing movement. In other embodiments, where the open door leaf angle α deviates from 90°, e.g., to approximately 180°, the door leaf angle is reduced to 0° from such a different door leaf angle α.

[0056] Fig. 4Figure 1 shows a schematic block diagram illustrating an embodiment of the door drive 10. This includes the drive unit 22 for generating torque, preferably in the form of an electric motor. The drive unit 22 is coupled to a gearbox 40, whereby the generated torque is transmitted to the linkage 24 via a coupling element (not shown in detail). The linkage 24 converts the received torque into an opening movement of the door leaf 12, thereby moving the door leaf 12 into the open position 34 (see opening movement in Figure 1). Fig. 2 ).

[0057] The control unit 50 is designed to generate a corresponding control signal upon receiving an input signal from one of the sensors 29, 30, 31 and to send it to the drive unit 22, causing the drive unit 22 to drive the door leaf 12 in the direction of the open position 34.

[0058] The opened door leaf 12 is then held in the open position 34 for an initial holding period. For this purpose, the door leaf 12 can be held in the open position 34 either by a continued torque generated by the drive unit 22 or by a separate holding device (not explicitly shown).

[0059] The initial hold period can be, for example, 5 seconds, 10 seconds, 15 seconds, 20 seconds, 25 seconds, or 30 seconds or more.

[0060] Furthermore, the door drive 10 includes a memory unit 52 connected to the control unit 50, which stores a control program 54 for the operation of the door drive 10. The control unit 50 has several wired or wireless inputs for the first sensor 29, the second sensor 30, and the further sensor 31 in order to receive an input signal when a corresponding sensor is actuated.

[0061] The control unit 50 can be implemented in any common control technology, including but not limited to microcontrollers or processors (e.g. PLC, CPU).

[0062] The memory unit 52 can optionally be integrated into the control unit 50 or connected to it as a separate unit. Suitable memory technologies for this purpose include, for example, E(E)PROM, S(D)RAM, or flash memory.

[0063] The door drive 10 also includes a line monitoring circuit 56, via which the control unit 50 is connected to the at least one sensor 29, 30, 31.

[0064] The control unit 50 is configured to execute the post-actuation process stored in the control program 54 upon receiving a further input signal after an initial holding period. This post-actuation process generates another control signal and sends it to the drive unit 22, which may move the door leaf 12 back into the open position 34 (provided the post-actuation process occurs during the closing movement) and hold it there for a second holding period.

[0065] A fire can be detected in the door system 100 via various detectors 58, such as a smoke detector or an excessive heat detector. For this purpose, the detector 58 generates an emergency signal, which is sent to the control unit 50 via a communication interface 62. In response to the emergency signal, the control unit 50 switches from normal operation to emergency operation.

[0066] In another embodiment, the emergency signal can also be generated by a detector 58, which is not located within the door system 100, and sent to the control unit 50 via a central reporting unit 60 using the communication interface 62.

[0067] The spring 27 integrated into the drive unit 22 is designed to absorb and store mechanical energy when the door leaf 12 is opened. Under normal operating conditions, the spring 27 either runs in conjunction with or is decoupled from the drive unit 22. In emergency operation, however, the control unit 50 disconnects the drive unit 22 from the power supply. The spring 27 then transfers the stored mechanical energy via a mechanism not explicitly shown to the linkage 24 in order to move the door leaf 12 into the closed position 32.

[0068] If the control unit 50 is operating in emergency mode and a person's opening request is detected, the drive unit 22 is temporarily supplied with energy for an initial hold-open period and, in the case of a subsequent operation, for a second period. During this time, the door leaf 12 is opened in servo or automatic mode. After the respective hold-open period has elapsed, the drive unit 22 is again disconnected from the energy supply, and the closing movement is initiated by the spring 27.

[0069] The procedure for controlling the door drive 10, implemented in control program 54, is shown in the flowchart in Fig. 6 shown.

[0070] The control program 54 stores the permissible duration of the first and second holding periods, the permissible maximum number of re-actuation operations, and a permissible total holding period for normal operation and emergency operation.

[0071] As soon as an emergency signal is received by the control unit 50, it switches to emergency mode. The control unit 50 then accesses the control program 54 stored in the memory unit 52 and uses the parameters stored there for the duration of the second hold-open period, the maximum permitted number of re-actuations, and the total hold-open period. In combination with the method for controlling the door drive, this ensures that the door leaf 12 is moved back to the closed position 32 as quickly as possible in emergency mode, while simultaneously enabling improved passage for people, especially those with limited mobility or disabilities.

[0072] In emergency operation, the input signal required for a re-actuation process can be triggered either by the first sensor 29 or by the second sensor 30, or only by the first sensor 29, while the second sensor 30 is deactivated.

[0073] Fig. 5Figure 1 shows a schematic representation of an exemplary line monitoring circuit 56, which is configured to provide various output voltage values. Based on these values, the control unit 50 can distinguish between activation of the first sensor 29 (electrical switch 68 closed), non-activation of the sensor (electrical switch 68 open), a line break, and a short circuit. For this purpose, the line monitoring circuit 56 comprises a pin 64, four ohmic resistors 66, and an electrical switch 68 of the first sensor 29, which is located in the door handle 20 and / or in the push button 28. The line monitoring circuit 56 has a supply voltage (24 V).

[0074] The control unit 50 monitors an output voltage value at pin 64, the value of which depends on the state of the line monitoring circuit 56. If the electrical switch 68 is in the open position, a first output voltage value (approximately 8 V) is detected at pin 64. If the first sensor 29 is actuated, causing the electrical switch 68 to move to the closed position, the control unit 50 detects a voltage drop in the form of an edge at pin 64, and a second output voltage value (approximately 9.6 V) is present at pin 64. In the event of a line break, the control unit 50 detects a third output voltage value (zero voltage, 0 V) ​​at pin 64. If a short circuit occurs between an input and an output line of the electrical switch 68, the control unit 50 detects a fourth output voltage value (approximately 12 V) at pin 64.In normal operation, the control unit 50 can be triggered both by a voltage drop, which is detected as an edge, and by the continuous application of the second output voltage value (level at approximately 9.6 V) to pin 64, which indicates that the first sensor 29 continues to be manually operated after the first hold-open period has elapsed and the electrical switch 68 remains in the closed switch position.

[0075] In contrast, in emergency operation the control unit 50 can only be triggered by an edge, but not by a level.

[0076] Fig. 6The present invention shows the control method 200 of the door drive 10 in the form of a flowchart. In a first step 210, the control unit 50 receives an input signal. It should be noted that the steps of the control method do not necessarily have to be executed in a strictly chronological order. For example, step 250, which includes switching to emergency operation, can also be performed before the first step 210.

[0077] In a second step 220, the control unit 50 generates a control signal in response, on the basis of which the door leaf 12 is driven in a servo or automatic operation between a closed position 32 and an open position 34 and is held in the open position 34 for a first holding period.

[0078] In a third step 230, the control unit 50 receives another input signal for a follow-up actuation process, indicating a further opening request of the door leaf 12.

[0079] In a fourth step 240, the control unit 50 generates another control signal, on the basis of which the door leaf 12 is held in the open position 34 for a second holding period.

[0080] In a fifth step 250, the control unit 50 switches from normal operation to emergency operation in response to an emergency signal, in which the first holding period and / or second holding period in the emergency operation is shorter than in the normal operation and / or a permitted maximum number of re-actuation operations in the emergency operation is less than in the normal operation and / or a total holding period in the emergency operation is shorter than in the normal operation. Reference symbol list

[0081] 10 Door drive 12 Door leaf 14 Door frame 16 Door hinge 18 Longitudinal axis 20 Door handle 22 Drive unit 24 Linkage 26 Guide 27 Spring 28 Push button 29 First sensor 30 Second sensor 31 Additional sensor 32 Closed position 34 Open position 36 Opening arrow 38 Closing arrow 40 Gearbox 50 Control unit 52 Memory unit 54 Control program 56 Line monitoring circuit 58 Detector 60 Central signaling unit 62 Communication interface 64 Pin 66 Ohmic resistor 68 Electrical switch 100 Door system α Door leaf angle

Claims

1. Door drive (10) comprising: - a drive unit (22) configured to drive a movable door leaf (12) in servo or automatic operation between a closed position (32) and an open position (34); and - a control unit (50) configured to generate a control signal upon receiving an input signal indicating an initial opening request of the door leaf (12), based on which the door leaf (12) is driven in servo or automatic operation between the closed position (32) and the open position (34) and is held in the open position (34) for an initial holding period, wherein the control unit (50) is configured, in the event of a subsequent actuation process in which the control unit (50) receives a further input signal indicating a further opening request of the door leaf (12),After the door leaf (12) has been opened and is not yet back in the closed position (32), a control signal is generated on the basis of which the door leaf (12) is held in the open position (34) for a second holding period, wherein the control unit (50) has a normal operation and an emergency operation, and wherein (i) the first holding period and / or the second holding period in the emergency operation is shorter than in the normal operation and / or (ii) a permissible maximum number of re-actuation operations in the emergency operation is less than in the normal operation and / or (iii) a total holding period in the emergency operation is shorter than in the normal operation.

2. Door drive (10) according to claim 1, wherein the control unit (50) is configured to generate the control signal for the re-actuation process only when the further input signal is received after the first holding period has elapsed.

3. Door drive (10) according to one of the preceding claims, wherein the control unit (50) can be triggered in normal operation by an edge and / or by a level of the input signal and in emergency operation by an edge.

4. Door drive (10) according to one of the preceding claims, further comprising a line monitoring circuit (56) which is configured to make the post-actuation process distinguishable from a short circuit for the control unit (50).

5. Door drive (10) according to one of the preceding claims, wherein the permissible maximum number of re-actuation operations in normal operation is unlimited.

6. Door drive (10) according to one of the preceding claims, wherein the total holding time in normal operation is unlimited.

7. Door drive (10) according to one of the preceding claims, wherein the second holding period is the same length or shorter than the first holding period.

8. Door drive (10) according to one of the preceding claims, wherein the door leaf (12) is driven by the drive unit (22) in servo or automatic operation between the closed position (32) and the open position (34) and the door leaf (12) is held in the open position (34) by the drive unit (22) and / or by a holding device.

9. Door drive (10) according to one of the preceding claims, wherein the control unit (50) is configured to switch to emergency operation upon receipt of an emergency signal.

10. Door system (100) comprising: - a movable door leaf (12); - a door drive (10) according to claims 1 to 9; and - at least one sensor for generating the input signal.

11. Door system (100) according to claim 10, wherein the door drive (10) is configured according to claim 9, and wherein the at least one sensor comprises: a smoke detector (58) configured to generate the emergency signal; an excessive heat detector (58) configured to generate the emergency signal; and / or a communication interface (62) configured to receive the emergency signal and transmit it to the control unit (50).

12. Door drive (10) according to claim 10, wherein the at least one sensor comprises a first sensor (29) and a second sensor (30), wherein the first sensor (29) is configured as a push button or door handle detection sensor and the second sensor (30) is configured as a radar, infrared, laser, LiDAR, ToF or ultrasonic sensor.

13. Door drive (10) according to claim 12, wherein the second sensor (30) is deactivated in emergency operation.

14. Control method (200) for a door drive (10) according to one of the preceding claims, comprising the steps of: - Receiving an input signal (210) indicating an initial opening request of a door leaf (12); - In response to the input signal, generating a control signal (220) based on which the door leaf (12) is driven in servo or automatic operation between a closed position (32) and an open position (34) and is held in the open position (34) for a first holding period; - Receiving a further input signal for a subsequent actuation process (230) indicating a further opening request of the door leaf (12); - In response to the further input signal, generating a further control signal (240) based on which the door leaf (12) is held in the open position (34) for a second holding period;and - In response to an emergency signal, switching from normal operation to emergency operation (250), wherein the first hold-open period and / or the second hold-open period in the emergency operation is shorter than in the normal operation and / or an allowed maximum number of re-actuation operations in the emergency operation is less than in the normal operation and / or a total hold-open period in the emergency operation is shorter than in the normal operation.; 15. Computer program configured to execute the control method according to claim 14 when the computer program is executed in a control unit (50) of a door drive (10).

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