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DE-102024133188-A1 - Device for detecting a jamming event of a motor-operated locking element

DE102024133188A1DE 102024133188 A1DE102024133188 A1DE 102024133188A1DE-102024133188-A1

Abstract

Device for detecting a jamming event of a motor-operated locking element, in particular an electrically driven window pane of a motor vehicle, comprising a proximity sensor which includes at least one electrically conductive element which generates an electric field (F) in an opening area of the locking element, and a control unit connected to the proximity sensor which detects a change in the capacitance of the electrically conductive element and provides a control signal, characterized in that the motor-operated locking element is designed as a laminated glass pane and the proximity sensor is positively embedded within the laminated glass pane.

Inventors

  • Stephanie Göhl
  • Berthold Esders

Assignees

  • KOSTAL AUTOMOBIL ELEKTRIK GMBH & CO. KG

Dates

Publication Date
20260513
Application Date
20241113

Claims (9)

  1. Device (1) for detecting a jamming event of a motor-operated locking element (2), in particular an electrically driven window pane of a motor vehicle, - with a proximity sensor (3) comprising at least one electrically conductive element (8) that generates an electric field (F) in an opening area of the locking element (2), and - with a control unit (4) connected to the proximity sensor (3) that detects a change in the capacitance of the electrically conductive element (8) and provides a control signal, characterized in that the motor-operated locking element (2) is designed as a laminated glass pane (7) with an intermediate layer (12) and the proximity sensor (3) is embedded within the laminated glass pane (7).
  2. Device (1) according Claim 1 , characterized in that the proximity sensor (3) is arranged at least sectionally at the upper edge (9) of the laminated glass pane (7).
  3. Device (1) according to one of the Claims 1 until 2 , characterized in that the proximity sensor (3) is designed as an electrically conductive area of a laminated glass pane (7) at the upper edge (9) of the pane.
  4. Device (1) according to one of the Claims 1 until 4 , characterized in that the electrically conductive element (8) is formed from a conductive layer (10,11), in particular from a conductive film (10, 11).
  5. Device (1) according Claim 4 , characterized in that the conductive film (10, 11) is integrated section by section on a first (5) and on a second (6) pane of the laminated glass pane (7) at the top edge (9) of the pane.
  6. Device (1) according to one of the Claims 1 until 4 , characterized in that the electrically conductive element (8) is formed from at least one first (12) and one second conductive (13) wire at the top edge (9) of a laminated glass pane (7).
  7. Device (1) according to one of the Claims 1 until 7 , characterized in that the electrically conductive element (8) is formed from a combination of a conductive film (10, 11) and a conductive wire (12, 13) at the top edge (9) of a laminated glass pane (7).
  8. Device (1) according to one of the Claims 1 until 8 , characterized in that the intermediate layer (12) comprises at least one substance selected from the group consisting of polyurethanes (PUR), polybutylene terephthalates (PBT), polycarbonates (PC), polyethylene terephthalates (PET) and polyethylene naphthalates (PEN), polyvinyl chlorides (PVC), polyvinyl fluorides (PVF), polyvinyl butyrales (PVB), ethylene vinyl acetates (EVA), polyacrylates (PA), polymethyl methacrylates (PMMA), and/or mixtures and copolymers.
  9. Device (1) according to one of the Claims 5 until 9 , characterized in that an adhesive layer or an adhesive film is integrated between the first (5) disk and the second (6) disk in addition to the intermediate layer (12).

Description

Device for detecting a jamming event of a motor-operated locking element, in particular an electrically driven window pane of a motor vehicle, comprising a proximity sensor comprising at least one electrically conductive element that generates an electric field (F) in an opening area of the locking element, and a control unit connected to the proximity sensor that detects a change in the capacitance of the electrically conductive element and provides a control signal. Such a device is typically used in vehicle technology as anti-pinch protection to prevent, for example, a human body part, such as a finger, from being trapped between the locking element and a frame that at least partially surrounds the locking element. The mode of operation of such a capacitive anti-pinch device is based on an influence on the electric field caused by an electrically conductive obstacle in the opening area of the locking element, which can be detected as a change in the capacitance of the sensor electrode. In contrast to a so-called tactile anti-pinch device, which requires physical contact between the obstacle and a corresponding sensor, in the present case the presence of the obstacle in the opening area of the locking element is detected without contact by the capacitive anti-pinch device. Various devices for preventing entrapment are already known in the prior art. To achieve this prevention, different sensor designs are used in various locations or areas within the locking system, such as in the area of a seal. An anti-pinch device that requires physical contact between the obstacle and a sensor is used, for example, in the EP 0 638 701 B1 This tactile anti-pinch device features a seal that protects a locking element and is equipped with a sensor unit. The sensor unit has two electrically conductive areas spaced apart from each other. When the sensor unit comes into physical contact with an obstacle located in the opening area of the locking element, the electrically conductive areas are pressed together. This creates a switching contact, which is detected by an evaluation unit and converted into an electrical control signal. A capacitive pinch protection system is exemplified in the EP 1154 110 A2 The pinch protection described therein has two electrical conductors that generate the electric field in the opening area of a locking element. One of the two conductors, the sensor electrode, is integrated into a seal that seals the locking element and is supplied with a predetermined electrical charge, which initiates a reference capacitance. The change in the capacitance of the sensor electrode relative to the reference capacitance due to the presence of an obstacle in the opening area of the locking system is then detected by a corresponding control unit. Both direct and indirect anti-pinch devices share the disadvantage of integrating the sensor electrode, a finished component, into a seal that seals the closing element. This necessitates the use of additional, and often maintenance-intensive, external components for the detection of an anti-pinch event, which is generally considered a drawback. Based on the prior art, the invention therefore aims to provide an efficient, maintenance-free, cost-effective and thus improved device for detecting a jamming event of a motor-operated locking element of a vehicle. This problem is solved according to the invention by designing the motor-operated locking element as a laminated glass pane and embedding the proximity sensor within the laminated glass pane. Further advantageous embodiments of the invention are the subject of the dependent claims. The above and further objectives, properties and other advantages of the invention are explained in detail below in conjunction with the accompanying drawings. They show: 1 : a section of a side window of a vehicle. 2a - 2b : a side window with the capacitive proximity sensors on a laminated glass pane in a detail view. 3a : a first arrangement of the proximity sensors (electrically conductive layer) according to the invention. 3b : a second arrangement of the proximity sensors according to the invention as conductive wires. 4a -b: a further arrangement according to the invention with proximity sensors spaced at different distances from each other. The 1 Figure 1 shows the device according to the invention for detecting entrapment events, for example of a human body part, such as a finger. The in 1 The vehicle door 19 shown is equipped with a locking device 18 and an electric motor integrated therein for opening and closing a locking element 2 provided therein. The window pane 2, which represents a closing element, is movable in a vertical direction of movement within the guide elements 15, 16 attached there. In addition to a window pane 2, other design variants are of course conceivable, such as a rear window or a roof window, provided that these are designed as a composite pane. Furthermore, it is from 1 It is evident that the proximity s