EP2304751A1 - Baguette de commutation pour la détection d'obstacles et dispositif pour la détection d'obstacles - Google Patents

Baguette de commutation pour la détection d'obstacles et dispositif pour la détection d'obstacles

Info

Publication number
EP2304751A1
EP2304751A1 EP09777588A EP09777588A EP2304751A1 EP 2304751 A1 EP2304751 A1 EP 2304751A1 EP 09777588 A EP09777588 A EP 09777588A EP 09777588 A EP09777588 A EP 09777588A EP 2304751 A1 EP2304751 A1 EP 2304751A1
Authority
EP
European Patent Office
Prior art keywords
conductor
profile
switching strip
detection
profile body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09777588A
Other languages
German (de)
English (en)
Inventor
Gerd Reime
Thomas Wiest
Marc Scherraus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mayser GmbH and Co KG
Original Assignee
Mayser GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mayser GmbH and Co KG filed Critical Mayser GmbH and Co KG
Publication of EP2304751A1 publication Critical patent/EP2304751A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/14—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for operation by a part of the human body other than the hand, e.g. by foot
    • H01H3/141—Cushion or mat switches
    • H01H3/142—Cushion or mat switches of the elongated strip type
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/40—Safety devices, e.g. detection of obstructions or end positions
    • E05F15/42—Detection using safety edges
    • E05F15/46—Detection using safety edges responsive to changes in electrical capacitance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/50—Application of doors, windows, wings or fittings thereof for vehicles
    • E05Y2900/53—Type of wing
    • E05Y2900/546—Tailboards, tailgates or sideboards opening upwards
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960755—Constructional details of capacitive touch and proximity switches
    • H03K2217/96078—Sensor being a wire or a strip, e.g. used in automobile door handles or bumpers

Definitions

  • the invention relates to a switching strip profile for a switching strip for detecting obstacles, with a profile body of electrically non-conductive material, a first conductor, which is arranged in a detection direction seen in the rear portion of the profile body, and a second conductor, seen in a detection direction front region of the profile body is arranged.
  • the invention also relates to a device for detecting obstacles with a switching strip profile according to the invention.
  • a safety edge for the detection of obstacles is known, which is intended for the capacitive detection of obstacles.
  • a first conductor which is arranged in a rear region of the profile body viewed in the detection direction, serves there as a so-called shield electrode and a second conductor, which is arranged in a front region of the profile body viewed in the detection direction, serves to generate an electric field.
  • Starting from the second conductor will be Field lines through the profile body through and to a reference electrode, such as a motor vehicle body, extend.
  • the first conductor is intended to prevent the field from extending from the second conductor directly opposite to the detection direction to the reference potential.
  • the first conductor is held for this purpose as a shield electrode at a potential which approximately corresponds to the potential of the second conductor. If an obstacle moves into the field between the second conductor and the motor vehicle body, the capacitance between the second conductor and the motor vehicle body changes, which can be detected, for example, by monitoring the voltage on the second conductor. Extremely problematic in these known switching strips that the generation of the electric field and the evaluation of a change in the capacitance between the switching strip and reference potential takes place on one and the same electrode. This has the consequence that, for example, a wetting of the switching strip with water already leads to a strong Signalvertigschung and possibly thwarted the detection of an obstacle.
  • a switching strip profile for the detection of obstacles is to be provided, with the capacitive detection of a reliable detection of obstacles can be achieved and is insensitive to interference, such as wetting the safety edge.
  • a switching strip profile for a switching strip for detecting obstacles with a profile body of electrically non-conductive material a first conductor which is arranged in a detection direction seen in the rear area of the profile body, and a second conductor is provided, which seen in a detection direction is arranged at the front region of the profiled body, in which the first conductor has, seen in a cross-section of the profile, two lateral surfaces which are substantially parallel and at a slight distance. stood to a respective outer wall of the profile body.
  • the first conductor on its underside, which faces a mounting surface of the profile body have a U-like shape, which is open to the mounting surface.
  • the switching strip profile according to the invention is provided for the capacitive detection of obstacles, wherein the electric field whose influence is used by obstacles to detect these obstacles is generated by the first conductor and the second conductor receives or receives this field and then also radiates.
  • the first conductor is connected in a low-impedance manner to a control unit
  • the second conductor is connected to the control unit in a high-impedance manner and thus is not supplied by the control unit with a signal which is used to generate the electric field. Rather, only a high-impedance signal is picked up on the second conductor, which is an indicator of a change in the capacitance between the second conductor and the reference electrode.
  • any wetting of the profile body with water, ice or the like no longer plays a role and can not affect the detection of obstacles.
  • the first conductor seen in a cross section of the profile on two side surfaces which extend substantially parallel and at a small distance from a respective outer wall of the profile. With such a design of the two side surfaces of the first conductor, a comparatively large capacity is created between the first conductor and the lateral outer walls of the profile body. A possible film of water, which rests on the outside of the profile body, is thereby detected by the field lines emanating from the first conductor and may possibly redirect these field lines in the direction of the reference electrode.
  • the first conductor By having the first conductor on its underside, which faces a mounting surface of the profile body, having a U-like shape, which is open to the mounting surface, a reduction of the capacitance between the first conductor and the mounting surface against a rectilinear formation of the first conductor in this Area reached.
  • safety edges are fixed in applications in the motor vehicle on the electrically conductive vehicle body, which also forms the reference electrode.
  • the smallest possible capacitance between the first conductor and the reference electrode prevents interference of the transmitting system with the first conductor due to an undesired low-pass effect through the capacitance between the first conductor and the reference electrode.
  • the first conductor has a U-like shape on its upper side facing the second conductor, which is open toward the second conductor.
  • a comparatively small capacity is achieved between the first conductor and the second conductor.
  • Such a small capacitance between the first conductor and the second conductor favors the sensitivity in the capacitive detection of obstacles.
  • An obstacle in the detection area of the safety edge changes the capacitance between the second conductor and a reference electrode.
  • This change in capacity is due to a change in the second conductor detected high-impedance tapped signal, the second conductor forms the tapping point of a capacitive voltage divider.
  • the capacitance between the first conductor and the second conductor is rather small, this improves the sensitivity of detection because the capacitance between the second conductor and the reference electrode is also small because of the inevitably large distance between the second conductor and the reference electrode.
  • a front surface of the second conductor which is seen in the detection direction forward, arranged substantially parallel to an outer surface of the profile body.
  • the front surface of the second conductor is arranged at a distance from the outer surface of the profile body, which is greater than a distance of the side surfaces of the first conductor to a respective lateral outer wall of the profile body.
  • a capacitance between the second conductor and the outer surface of the profile body is smaller than a capacitance between the first conductor and the outer surfaces of the profile body, so that an e- ventuelle wetting of the outer surface of the profile body, such as a water film, rather through the first conductor is affected by the second conductor.
  • the influence of wetting on the electric field generated by the second conductor thus remains low.
  • a front surface of the second conductor is formed as a circular arc in the cross section of the profile seen.
  • the surface of this front surface is increased relative to a rectilinear configuration. This also increases the detection area of the safety edge and the sensitivity to the detection of obstacles can be improved.
  • the profile body has a cavity adjoining an underside of the second conductor and an upper side of the first conductor.
  • Such a cavity, typically filled with a gas, for example air, between the first conductor and the second conductor contributes to a reduction in the capacitance between the first conductor and the second conductor. As already explained, this can improve the sensitivity of the safety edge over the detection of obstacles.
  • the second conductor and / or the first conductor have a projection which projects into the cavity in the direction of the first conductor or the second conductor.
  • a device for detecting obstacles with a switching strip in which a control unit is provided, which is low-impedance coupled to the first conductor and high impedance to the second conductor, wherein in operation by means of the control unit and the first conductor generates an electric field, wherein due to the electric field generated by the first conductor by capacitive coupling between the first conductor and the second conductor an electric field between the second conductor and a reference potential is formed and wherein by means of the control unit, a change in the capacity between the second Conductor and reference potential, caused by an obstacle, is detected.
  • the device according to the invention for detecting obstacles is insensitive to wetting of an outer side of the switching strip, for example by raindrops. Because the second conductor is not fed by the control unit with a signal, but receives by the capacitive coupling between the first conductor and the second conductor emitted from the first conductor signal. Due to the high-impedance coupling of the second conductor to the control unit, the potential at the second conductor essentially follows the signal pattern on the first conductor, and the second conductor also emits a signal, in that an electric field is formed between the second conductor and the reference electrode.
  • the second conductor is high-impedance coupled to the control unit and by means of the control unit is tapped only a signal from the second conductor, for example a voltage on the second conductor, which characterizes a capacitance or a change in the capacitance between the second conductor and the reference electrode.
  • the device according to the invention is thus insensitive to environmental influences, such as wetting of an outer surface of the switching strip, and a reliable detection of obstacles can take place without contact.
  • a resistance of less than 200 ⁇ is considered low resistance
  • a resistance of more than 50 k ⁇ is considered high-impedance.
  • the high-resistance connection thus has a resistance which is at least 250 times the low-resistance connection.
  • the control unit may comprise a bridge circuit having a low-resistance branch and a high-resistance branch, wherein the first conductor is connected to the low-resistance branch and the second conductor to the high-resistance branch.
  • the first conductor and the second conductor are connected in a high-impedance manner by means of a terminating resistor.
  • the high-resistance connection between the first conductor and the second conductor must be designed so that it has only a negligible influence on the signal transmission between the first conductor and the second conductor with respect to the capacitive coupling between the first conductor and the second conductor. Nevertheless, such a high-impedance connection by means of a terminating resistor can provide a reliable inspection of the operability of the safety edge. For in a severing of the safety edge no connection could be made at all over the terminating resistor between the first conductor and the second conductor and damage to the switching strip can be detected.
  • the control unit must have means for detecting an interruption of the first and / or the second conductor for this purpose. In a development of the invention, the control unit has means for detecting a mutual contact of the first conductor and the second conductor.
  • an additional tactile detection can be realized by means of the device according to the invention.
  • the capacitance between the first conductor and the second conductor which changes significantly as a result of contact of the first conductor and the second conductor can take place. It is also possible to detect an ohmic resistance or a capacitance between the first conductor and the second conductor, which also changes significantly when touched.
  • the additional tactile detection may be accomplished either by detecting a mutual displacement of the two conductors which changes the capacitance between the first and second conductors, or by a bias current measurement of a quiescent current flowing through the two conductors via the termination resistor or terminating capacitance.
  • the terminating resistor general electrical or electronic components can be used, for example integrated circuits, transponders, diodes, temperature-sensitive resistors, inclination sensors or the like.
  • an evaluation of the amount of quiescent current can provide information about a temperature in the area of the safety edge. Depending on the temperature, a vehicle door can then be moved, for example, quickly or slowly.
  • FIG. 1 is a sectional view of a switching strip profile according to a first embodiment of the invention
  • FIG. 2 is a sectional view of a switching strip profile according to a second embodiment of the invention.
  • FIG. 3 shows a block diagram of a circuit for detecting capacitive changes to a switching strip profile according to the invention
  • FIG. 4 shows a block diagram according to FIG. 3, in which the summation resistances are replaced by impedance converters,
  • FIG. 5 shows a block diagram according to FIG. 3 with a circuit for monitoring the switching strip for mechanical damage and deformations
  • FIG. 6 is a block diagram according to FIG. 4, wherein a further conductor is connected
  • FIG. 7 is a side view of a switching strip profile according to a third embodiment of the invention.
  • FIG. 8 is a sectional view of the switching strip profile of FIG. 7 on the cutting plane VIII-VIII,
  • FIG. 9 is a side view of a switching strip profile according to a fourth embodiment of the invention
  • 10 is a sectional view of the switching strip profile of FIG. 9 on the sectional plane XX
  • FIG. 9 is an isometric view of the contact strip profile of FIG. 9,
  • FIG. 12 is a side view of a switching strip profile according to a fifth embodiment of the invention.
  • FIG. 13 is a sectional view of the switching strip profile of FIG. 12 on the sectional plane XIII-XIII,
  • FIG. 15 shows a side view of a switching strip profile according to the invention according to a sixth embodiment of the invention.
  • FIG. 16 is a sectional view of the switching strip profile of FIG. 15 on the sectional plane XVI-XVI of Fig. 15,
  • FIG. 17 is an isometric view of the contact strip profile of FIG. 15,
  • FIG. 18 is a side view of a switching strip profile according to the invention according to a seventh embodiment of the invention.
  • 19 is a sectional view of the switching strip profile of FIG. 18 on the sectional plane XVIII-XVIII, 20 is an isometric view of the contact strip profile of FIG. 18,
  • FIG. 21 is a side view of a switching strip profile according to an eighth embodiment of the invention.
  • FIG. 22 shows a sectional view of the switching strip profile of FIG. 21 on the sectional plane XXII-XXII 1.
  • FIG. 23 is an isometric view of the contact strip profile of FIG. 21; FIG.
  • FIG. 24 is an isometric view of a switching strip profile according to the invention according to a ninth embodiment of the invention.
  • FIG. 25 is a sectional view of the switching strip profile of Fig. 24,
  • 26 is a sectional view of a switching strip profile according to a tenth embodiment of the invention.
  • FIG. 27 is a sectional view of a contact strip profile according to an eleventh embodiment of the invention.
  • FIG. 28 is a sectional schematic horizontal section through a vehicle in the region of its tailgate the tailgate side is provided with a switching strip profile of FIG. 15, 16 and 17,
  • FIGS. 15, 16 and 17 are schematic, section-wise horizontal section through a vehicle, the raw-body side in the region of its tailgate is provided with a switching strip profile according to FIGS. 15, 16 and 17,
  • FIG. 30 is a sectional, schematic, horizontal section through a vehicle, which is provided in the region of its sliding side door with a switching strip profile of FIG. 15, 16 and 17, and
  • FIG. 31 shows a section-wise, schematic horizontal section through a vehicle in the region of its tailgate, which is provided with a switching strip profile according to FIGS. 15, 16 and 17.
  • a switching strip profile 10 has a first electrical conductor 12 and a second electrical conductor 14, between which an air-filled cavity 16 is arranged.
  • the two conductors 12, 14 are extruded together with an electrically non-conductive profile body 18.
  • the profile body 18 carries on its underside still a fastening strip 20, for example, an adhesive strip.
  • the conductors 12, 14 are each formed by regions of conductive plastic, these regions each having a wire strand 22, 24 in a central region.
  • the switching strip profile shown in FIG. 1 is produced by extrusion. During extrusion, the wire strands 22, 24 are introduced simultaneously.
  • the first conductor 12 has a cross section with a generally H-like or bone-like shape.
  • the first conductor has two side surfaces 26, 28, which are each arranged parallel to and at a small distance from a respective outer surface of the profile body 18.
  • the side surfaces 26, 28 extend approximately over half the height of the profile body 18 parallel to its respective right or left outer surface.
  • the distance between the side surfaces 26, 28 and the respective outer surface of the profile body 18 is comparatively small, in order to see these outer surfaces and the side surfaces 26, 28 to obtain a comparatively large capacity.
  • a lower boundary of the first conductor 12, which faces the fastening strip 20, has a U-like shape, which is open towards the fastening strip 20. Contrary to the detection direction or from the wire strand 22 downwards, as seen from the fastening strip, the lower boundary surface of the first conductor 12 thus has a concave, inwardly curved shape.
  • the safety edge profile 10 is, at least when used in the motor vehicle, usually placed or glued to the metallic vehicle body. Due to the concave design of the lower boundary surface of the first conductor 12, a capacitance between the first conductor 12 and an electrically conductive body can be reduced in order to avoid an undesirable low-pass effect.
  • An upper boundary surface 32 which adjoins the cavity 16 and faces the second conductor 14, is also inwardly curved or concave, viewed from the first conductor. Seen in cross-section, the upper boundary surface 32 of the first conductor 12 thus has a U-like shape.
  • a capacitance between the first conductor 12 and the second conductor 14 can be kept low. This also improves the sensitivity of the capacitive detection of obstacles, since for the detection of obstacles, a capacitive voltage divider from the capacitance between the first conductor 12 and second conductor 14 and the second conductor 14 and a reference electrode, such as ground, is formed.
  • a voltage on the second conductor 14 via a high-impedance connection to a control unit Taken then, for example, a voltage on the second conductor 14 via a high-impedance connection to a control unit.
  • a capacitance between the second conductor 14 and the reference electrode is very small due to the usually large distance, such that a small capacitance between first conductor 12 and second conductor 14 improves the sensitivity.
  • the first conductor 12 would have an H-shape, ie have two lateral strips instead of the side surfaces 26, 28, which would be connected by means of a horizontal transverse strip.
  • the profile body 18, the first conductor 12 and the second conductor 24 are extruded together, wherein the first conductor 12 and the second conductor 14 made of conductive plastic and the profile body 18 are made of non-conductive plastic. Simultaneously with the extrusion, the wire strands 22, 24 are inserted. The attachment of the fastening strip 20 can be done later.
  • the second conductor 14 has approximately the shape of a circular segment in cross-section, with a lower boundary surface 34, which adjoins the cavity 16 and faces the first conductor 12, is approximately planar. Only in the middle of the lower boundary surface 34 is a cylinder-section elevation arranged. This survey serves to embed the wire strand 24 also on the side of the lower boundary surface 34 completely and with a certain material thickness.
  • a front surface 36 of the second conductor 14, which is located at the front as seen in the detection direction, is circular-shaped in cross-section. This results in a total of about the shape of a circle segment in cross section.
  • the front surface 36 which serves as a detection surface and from which emanates the electric field, the change of which then allows the detection of an obstacle, can thus be made larger in area, which also improves the sensitivity of the detection.
  • the front surface 36 is also parallel to an outer surface 38 of the profile body 18 in the upper Area of the switching strip profile 10 is arranged.
  • a capacitance between the front surface 36 of the second conductor 14 and the outer surface 38 of the profile body 18 is thus substantially constant over the front surface 36. Even with a wetting of the outer surface 38 by water droplets, dirt or hoar, thereby form no local field strength maxima that could affect detection.
  • the front surface 36 of the second conductor 14 is located at a greater distance from the outer surface 38 of the profile body 18 than the two side surfaces 26, 28 of the first conductor 12.
  • the capacitance between the front surface 36 and the outer surface 38 is thereby less than the capacitance between the two
  • water droplets that wet the outer surface 38 rather influenced by the first conductor 12 than by the second conductor 14. Due to the low-resistance connection of the first conductor 12th this will not affect the obstacle detection.
  • FIG. 2 shows a sectional view of a further switching strip profile 40 according to a further embodiment of the invention. Only the different designs for the switching strip profile 10 of FIG. 1 are explained. Equally constructed elements are provided with the same reference numerals as in Figure 1.
  • the contact strip profile 40 has a profile body 18 and a first conductor 12 and a fastening strip 20, which are each constructed identically to the respective elements of the contact strip profile 10 of FIG.
  • a second conductor 42 is seen in the detection direction, that is arranged from the first conductor 12 in the direction of the second conductor 42, above the first conductor.
  • a front surface 36 of the second conductor 42 is constructed identically to the front surface 36 of the second conductor 14 of FIG.
  • the second conductor 42 has a projection 44 which in a cavity 46 between the first conductor 12 and protrudes second conductor 42.
  • the projection 44 is formed approximately trapezoidal in cross-section of FIG. 2, wherein a width of the projection 44 in the direction of the first conductor 12 is reduced.
  • the cavity 46 is like the cavity 16 of the contact strip profile 10 of FIG. 1 air-filled and vented.
  • the U-shaped design of the projection 44 facing the top of the first conductor 12 makes it possible that even with oblique compression of the profile body 18, the projection 44 has to travel the same way to contact the first conductor 12, as in exactly vertical admission by the 2 force F. Up to an angle of the force F of ⁇ 45 °, the projection 44 must always cover the same way to touch the second conductor 12.
  • FIGS. 3 to 6 illustrate the operation of a device for detecting obstacles.
  • the switching strip profile 10 of FIG. 1 or the switching strip profile 40 of FIG. 2 is used instead of the switching strip profile 50 shown in FIGS. 3 to 6 in a device according to the invention for detecting obstacles.
  • a first conductor 12 is designated in the illustrations of FIGS. 3 to 6 by the reference numeral 1.5, a second conductor 14, 42 by the reference numeral 1.3.
  • a clock generator 5.8 delivers a first clock signal 5.13 to a first amplitude controller 5.10 and a second inverted clock signal 5.12 to a second amplitude controller 5.9.
  • an electrical alternating signal of eg 70Khz is used.
  • the low-impedance output of the first amplitude regulator 5.10 is connected to the first conductive element 1.5, corresponding to the first conductor 12. Due to capacitive effects, this transmits the first clock signal 5.13 to the conductive element 1.3, corresponding to the second conductor 14, 42. Via the high-impedance summation resistor 5.4, the signal of the conductive element 1.3 is applied to the input of the AC amplifier 5.5. given, the second, to the first clock signal 5.13 inverted clock signal 5.12 is given via the second amplitude controller 5.9 to the reference series capacity 5.1 and a second high-impedance summation resistor 5.2 to the input of the AC amplifier 5.5.
  • the reference series capacitance 5.1 should be approximately the same size as the capacitance of the conductive elements 1.5 and 1.3 to each other. An occurring capacity of the first conductive element 1.3 relative to the environment, for example the vehicle chassis, can be compensated by the parallel capacitor 5.3.
  • the summation resistors 5.2 and 5.4 should preferably be high-impedance and have the same values.
  • the previously summed clock signals 5.12 and 5.13 cancel each other out at the input of the amplifier 5.5, which is preferably designed as an AC amplifier. Since the amplifier 5.5 sees only noise at the input in the ideal case after the mutual cancellation of the clock signals, it can amplify very high or be implemented as a high-gain limiter amplifier.
  • the output signal 5.14 of the amplifier 5.5 is fed to the synchronous demodulator 5.6.
  • the output signals of the synchronous demodulator 5.6 which can be assigned to the two clock signals 5.12 and 5.13 are examined by the integrating comparator 5.7 for amplitude differences.
  • the comparator can be designed as a high-gain comparator circuit. Every little deviation of the input voltages
  • control value 5.16 changes to a higher control value.
  • the deviation in the control value 5.16 will increase or decrease compared to a previous value until the clock signal 5.13 and the inverted clock signal 5.12 are completely canceled again at the input of the AC amplifier 5.5.
  • control value increases with manual approach.
  • An evaluation logic can then make an evaluation of the control value 5.16, for example by means of a threshold value. Becomes If the threshold value is exceeded, this is considered a trapping risk and a mechanical movement can be stopped or reversed accordingly.
  • the summation resistors 5.2 and 5.4 can also be implemented by impedance converters 6.3 and 6.4 with a high-impedance input. Due to the active circuitry, the useful signal is not loaded on the second conductive element 1.3.
  • the evaluation electronics of the line monitoring 7.4 provide a voltage which is available via the resistors 7.2 and 7.3 at the input of an evaluation circuit
  • FIG. 6 shows an embodiment of a device according to the invention, which is provided for example for a closing tailgate of a motor vehicle, in which the movable tailgate 3.1 can move to the switching strip 50 and back away from it.
  • the use is also possible in all types of power-operated doors, gates and flaps. If the closing tailgate, the movable element 3.1, is provided only with a thin conductive planar element 4.2, there is a simplification of the circuit arrangement.
  • a non-conductive surface for example an adhesive strip 4.1 insulates the conductive planar element 4.2 relative to the metal surface of the movable element 3.1. Electrically, the conductive element 4.2 and the first conductive element 1.5 are connected via a line 8.1. However, the conductive element 4.2 can also be connected via a voltage divider to the signal for the conductive element 1.5 in order to compensate for any signal attenuation, for example by a summation resistor 5.4, cf. FIG. 3. Another possibility is to apply the conductive element 4.2 to the same electrical potential as the second conductive element 1.3. For this purpose, the signal at the second conductive element 1.3 is removed high impedance and placed on an impedance transformer to the conductive element 4.2.
  • FIG. 7 shows a switching strip profile 60 according to the invention, which is shown in section in FIG. 8.
  • the switching strip profile 60 is provided with a sealing lip 62 and a locking projection 64. With the latching projection 64, the switching strip profile 60 can be drawn, for example, into an undercut groove, and the sealing lip 62 can be used for sealing window frames or door frames.
  • the switching strip profile 60 is provided with two conductors 66, 68.
  • the first conductor 66 has a cross-sectionally M-like shape and is extruded of conductive, resilient material. In the middle of the first conductor 66, a wire strand 70 is arranged, which can also be seen in Fig. 7 and which protrudes at one end of the switching strip profile 60 and thereby can be connected to a control electronics.
  • the second conductor 68 consists exclusively of a strand of wire which is embedded in the elastic, non-conductive material of the switching strip profile 60.
  • an air-filled cavity 72 is disposed, and also the side of the wire strand 70 within the first conductor 66 are further air-filled cavities 74, 76 are arranged.
  • the air-filled cavity 72 provides a small capacitance between the first conductor 66 and the second conductor 68.
  • the air-filled cavities 74, 76 reduce capacitance between the first conductors 66 and a reference potential, not shown.
  • FIG. 9 shows a further switching strip profile 80 according to the invention.
  • the switching strip profile 80 is shown in section in FIG. 10 and in an isometric view in FIG. 11.
  • the contact strip profile 80 of FIGS. 9, 10 and 11 differs from the contact strip profile 60 of FIGS. 7 and 8 by omitting the sealing lip 62 and by providing a carrier web 82 instead of the locking projection 64. With the carrier web 82, the contact strip profile 80, for example, on a support glued on.
  • the illustration of FIG. 12 shows in a side view a further inventive switching strip profile 84, which is shown in a sectional view in Fig. 13 and in isometric view in Fig. 14.
  • the switching strip profile 84 differs from the switching strip profile 80 of FIGS.
  • FIG. 15 shows a further switching strip profile 90 according to the invention.
  • the switching strip profile 90 is shown in a sectional view in FIG. 16 and in an isometric view in FIG. 17.
  • the switching strip profile 90 has a first, strip-shaped conductor 92 with a rectangular cross-section. In the middle of the first conductor 92, a wire strand 94 is arranged.
  • the first conductor 92 is made of conductive, elastic material.
  • two different elastic materials are extruded, namely the conductive material of the first conductor 92 and the nonconductive elastic material surrounding the first conductor 92, in which a wire strand 96 is inserted which forms a second conductor.
  • the safety edge profile 90 is provided on its underside with a carrier web 98, which can then be glued, for example, to a body structure or other carrier.
  • an upper side of the first conductor 92 is arranged parallel to and at a small distance from the outer surface 100 of the switching strip profile 90. In the area of this outer surface 100 lies by a large capacity between the first conductor 92 and the outer surfaces 100. If moisture collects on these outer surfaces 100, for example in the form of drops or frost, the output signal of the switching strip 90 according to the invention is not or only insignificantly impaired thereby.
  • the outside of the switching strip profile 90 can be provided with a hydrophobic coating.
  • a hydrophobic coating For example, it is possible to provide the switching strip profile 90 on its outside with a so-called nano-coating. By providing such a nano-coating, water droplets form a critical angle of more than 90 °, so that a surface with superhydrophobic properties is formed. Ideally, a so-called lotus effect with contact angles of approximately 160 ° is erected. As a result, drops of water pearl off immediately and the disturbing effects of moisture and dirt on the outer surfaces of the safety edge profile 90 are prevented.
  • Such superhydrophobic coatings can, for example, be sprayed on, wiped on or already applied during production.
  • FIG. 18 shows a switching strip profile 102 according to the invention in a side view, which is shown in section in FIG. 19 and in isometric view in FIG. 20.
  • the switching strip profile 102 has a first conductor 104 and a second conductor 106.
  • the first conductor 104 consists of a slightly trapezoidal in cross section region of extruded, conductive elastic material, in the middle of a wire strand 108 is provided.
  • the second conductor 106 consists only of a strand of wire which is embedded in non-conductive elastic material of the switching strip profile 102.
  • the switching strip profile 102 has a reverse T-shape in cross section, wherein both conductors 104, 106 are arranged in an upwardly extending web of the switching strip profile 102.
  • the base of the T-shaped cross section is made of non-conductive elastic material and is provided on its, opposite the web bottom with a carrier web 110.
  • the side surfaces of the second conductor 104 are parallel and at a small distance from the lateral surfaces of the upwardly extending web.
  • FIG. 21 shows another switching strip profile 112 according to the invention, which is shown in the sectional view in FIG. 22 and in isometric view in FIG.
  • the contact strip profile 112 has a trapezoidal in cross section of Fig. 22 basic shape, which, starting from a bottom to which a carrier web 1 14 is fixed, upwards, ie in the detection direction, tapers.
  • the contact strip profile 112 is provided with a first conductor 116 and a second conductor 118.
  • the first conductor 116 consists of an approximately U-shaped region conductive, elastic material, in the base of a wire strand 120 is embedded. A distance of the legs of the second conductor 116 tapers parallel to the trapezoidal shape of the switching strip profile 112.
  • the second conductor 118 consists solely of a strand of wire which is embedded in the non-conductive elastic material of the switching strip profile 112.
  • the U-shaped configuration of the first conductor 116 favors a small capacitance between the first conductor 116 and the second conductor 118.
  • the upper free ends of the legs of the first conductor 116 are rounded to avoid field strength maxima between the first conductor 116 and the second conductor 118.
  • the respective outer side surfaces of the legs of the first conductor 116 are arranged parallel to and at a small distance from the outer surfaces of the switching strip profile 112.
  • a further embodiment of a sliding guide profile according to the invention is shown in an isometric view in FIG. 24 and in a front view in FIG. 25.
  • the contact strip profile 120 is not extruded but laminated. For this purpose, different layers are brought together and connected together in a suitable manner.
  • the switching strip profile 120 has a strip-shaped first conductor 122, which may for example consist of a metal track. Above the first conductor 122, a second conductor 124 is arranged in the form of a wire strand. Elastic non-conductive material is disposed between the first conductor 122 and the second conductor 124 and both the first conductor 122 and the second conductor 124 are laterally completely enveloped by the nonconductive elastic material. Only at the front and rear ends of the contact strip profile 120, the first conductor 122 and the second conductor 124 are accessible for a contact, if necessary. As can be seen in the front view of FIG. 25, the first conductor 122 is for the most part arranged in parallel and at a small distance from an outer surface of the switching strip profile 120.
  • FIG. 26 shows a front view of a further switching strip profile according to the invention.
  • a first conductor consists here of two metal strips 128, 130 which are arranged side by side and have a distance between them.
  • the second conductor 132 is arranged in the form of a wire strand, wherein the second conductor 132 is additionally displaced upward, in the detection direction, with respect to the two metal strips 128, 130.
  • the two metal strips 128, 130 and the second conductor 132 are completely surrounded by elastic, non-conductive material with the exception of their front and rear ends.
  • a first conductor of the switching strip profile 132 consists of a total of three metal strips 134, 136 and 138.
  • a second conductor is formed by a wire strand 140.
  • a first metal strip 134 extends substantially over the entire width of the switching strip profile 132.
  • Each of the metal strips 136, 138 each has slightly less than one third of the width of the metal strip 134 and is arranged parallel thereto.
  • An area remains free between the two metal strips 136, 138. In this area, the wire strand 140 is arranged centrally between the two metal strips 138, 136.
  • the three metal strips 134, 136, 138 and the wire strand 140 are completely surrounded by non-conductive, elastic material except for their front and rear ends.
  • FIG. 28 shows schematically and in sections a horizontal section through a motor vehicle, which is provided with a switching strip profile 90 according to the invention, as shown in FIGS. 15, 16 and 17.
  • a bodyshell structure 142 of the motor vehicle is shown in the area of a rear opening, which can be closed by means of a tailgate 144.
  • a rear window 146 is arranged on the tailgate 144.
  • the tailgate 146 can be opened or closed by an electric motor.
  • the contact strip profile 90 is disposed on the tailgate 144 so as to project furthest toward the body shell 142 as seen from the tailgate 144.
  • the safety edge profile 90 is connected with its carrier web 98 with a carrier 148, which in turn is secured by means of at least one expansion anchor 150 to the tailgate 144.
  • FIG. 29 shows a schematic and sectional horizontal section through a motor vehicle with a tailgate 144 that is comparable to FIG. 28.
  • the safety edge profile 90 is fixed by means of a carrier 152 on the shell body 142 of the motor vehicle according to FIG. 29.
  • the carrier 152 is connected to the bodyshell 142 by means of one or more expansion dowels 150.
  • the shift rail profile 90 is arranged to project furthest from the body shell 142 toward the tailgate 144.
  • FIG. 30 a further section-wise and schematic horizontal section through a motor vehicle is shown, which is provided with a lateral sliding door 154 with the switching strip profile 90 according to the invention.
  • the contact strip profile 90 is fastened by means of a carrier 156 to a front end of the sliding door 154, viewed in the direction of travel, by means of one or more expansion dowels 150. Seen from the sliding door 154 in the direction of a driver's door 158, the safety edge profile 90 therefore protrudes furthest.
  • the driver's door 158 and the sliding door 154 pivot or drive against a B-pillar 160 of the motor vehicle.
  • FIG. 31 shows a further schematic and sectional horizontal section through a motor vehicle, which is provided with a switching strip profile 162 according to the invention.
  • the switching strip profile 162 has a form comparable to the switching strip profile 90, but instead of a carrier web, a clamping section 164 is provided.
  • the clamping portion 164 is designed in the form of an open U-profile and has an approximately U-shaped clamping rail, which is embedded in elastic rubber material.
  • elastic fingers 166 protrude, complicate the type of barbs after sliding onto a strip-like projection, the removal of the switching strip profile 162.
  • the switching strip profile 162 is pushed onto a strip-like projection 168 which is formed at the rear end of a side wall 170 of the motor vehicle.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

1. Profil de baguette de commutation pour une baguette de commutation pour la détection d'obstacles et dispositif pour la détection d'obstacles. 2.1. L'invention concerne un profil de baguette de commutation pour une baguette de commutation destinée à détecter les obstacles, avec un corps profilé (18) en matériau électriquement non conducteur, un premier conducteur (12) qui est placé dans une partie arrière du corps profilé si l'on considère la direction de détection et un deuxième conducteur (14, 42) qui est placé dans une partie avant du corps profilé si l'on considère la direction de détection. 2.2. Selon l'invention, le premier conducteur possède, si l'on considère une coupe transversale du profil, deux surfaces latérales (26, 28) qui sont essentiellement parallèles et se situent à une faible distance de la paroi extérieure considérée (38) du corps profilé. Le premier conducteur possède sur sa face inférieure, qui est tournée vers une surface de fixation du profil, une forme en U s'ouvrant vers la surface de fixation. 2.3. L'invention concerne en outre l'utilisation, par exemple pour la protection des hayons arrières motorisés de véhicules automobiles.
EP09777588A 2008-07-31 2009-07-31 Baguette de commutation pour la détection d'obstacles et dispositif pour la détection d'obstacles Withdrawn EP2304751A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008035634.4A DE102008035634B4 (de) 2008-07-31 2008-07-31 Schaltleiste für die Erfassung von Hindernissen und Vorrichtung zum Erfassen von Hindernissen
PCT/EP2009/005576 WO2010012492A1 (fr) 2008-07-31 2009-07-31 Baguette de commutation pour la détection d'obstacles et dispositif pour la détection d'obstacles

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EP2304751A1 true EP2304751A1 (fr) 2011-04-06

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US (1) US20110128018A1 (fr)
EP (1) EP2304751A1 (fr)
DE (1) DE102008035634B4 (fr)
WO (1) WO2010012492A1 (fr)

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JP2022115412A (ja) * 2021-01-28 2022-08-09 日立金属株式会社 感圧センサ
JP2022160782A (ja) * 2021-04-07 2022-10-20 西川ゴム工業株式会社 センサー付きプロテクター

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DE102008035634A1 (de) 2010-02-04
WO2010012492A1 (fr) 2010-02-04
US20110128018A1 (en) 2011-06-02

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