WO2008116697A1 - Dispositif optique de sécurité antipincement - Google Patents

Dispositif optique de sécurité antipincement Download PDF

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Publication number
WO2008116697A1
WO2008116697A1 PCT/EP2008/051768 EP2008051768W WO2008116697A1 WO 2008116697 A1 WO2008116697 A1 WO 2008116697A1 EP 2008051768 W EP2008051768 W EP 2008051768W WO 2008116697 A1 WO2008116697 A1 WO 2008116697A1
Authority
WO
WIPO (PCT)
Prior art keywords
array
unit
photodiodes
optical anti
detect
Prior art date
Application number
PCT/EP2008/051768
Other languages
German (de)
English (en)
Inventor
Bernhard Sofaly
Original Assignee
Continental Automotive Gmbh
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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2008116697A1 publication Critical patent/WO2008116697A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
    • 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
    • E05F15/43—Detection using safety edges responsive to disruption of energy beams, e.g. light or sound
    • E05F15/431—Detection using safety edges responsive to disruption of energy beams, e.g. light or sound specially adapted for vehicle windows or roofs
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/50—Application of doors, windows, wings or fittings thereof for vehicles
    • E05Y2900/53—Application of doors, windows, wings or fittings thereof for vehicles characterised by the type of wing
    • E05Y2900/55—Windows

Definitions

  • the invention relates to an optical anti-pinch device, in particular in use for curved or irregularly shaped monitoring areas, for example for the U- monitoring of windows, sliding doors or tailgates in motor vehicles.
  • light barriers which can detect an obstacle on the connecting line between a transmitter and a receiver.
  • the receiver is designed to receive a signal from the transmitter during normal operation, and to detect the presence of the obstacle in the event of an obstacle in the monitoring area, by means of a reduction or collapse of the signal arriving at the receiver.
  • the transmitter and receiver of a light barrier can be linearly formed and positioned on the edge lines of the monitoring area.
  • the constructional outlay for the formation of such transmitter-receiver systems in which a respective transmitter and a receiver or a transmitter-receiver unit and a reflector lie on a straight line relative to one another, also increases have to.
  • sensors with transceiver systems based on a reflection of a signal by the obstacle to be detected are used, similar to the principle of a radar or echosounder.
  • the receiver of such a system is adapted to a To identify obstacles by the backscattered or reflected by this portion of a signal of the transmitter.
  • the document DE 696 34 151 T2 discloses an optical anti-pinch system with a sensor technology which is based on the reflection of infrared light. The intensity of the reflected infrared radiation from an obstacle is measured. Increasing the intensity of this incoming radiation on the receiver detects an obstacle.
  • the monitored area can not be adapted sufficiently well to curved surfaces in order, for example, to image a vehicle contour.
  • the known system is sensitive to temperature fluctuations as well as to a background radiation, which is included in the measurement.
  • an optical anti-jamming device comprising an emitter unit which is set up for radiation emission in a spatial area and a detector unit which is set up to detect a radiation field from the spatial area.
  • the device further comprises a control unit, which is designed to detect an obstacle in a predetermined monitoring area in the spatial area by evaluating output signals of the detector unit.
  • the detector unit comprises a sensor chip with a two-dimensional array of photosensors, that is to say a plurality of photosensors which are arranged in a predetermined two-dimensional geometry. see arrangement are arranged in particular on a common substrate.
  • the photosensor array is preceded by an imaging optic.
  • a series of photosensors arranged along a curved spatial line is understood as a two-dimensional array of photosensors.
  • imaging optics is understood to mean an optical component, for example a lens, a mirror or the like, or an arrangement of a plurality of such components, which in turn images the light beams incident on the optics from a point in space into a defined point of an image space.
  • Photodiodes are used in particular as photosensors.
  • the control unit is in particular formed by one or more software modules that are implemented on one or more hardware modules, in particular microcontrollers or the like.
  • an imaging optic is connected upstream of a photodiode array, each point in the monitoring area is unambiguously imaged onto a pixel in the vicinity of the sensor chip, and detected in a spatially selective manner by the photodiode array there.
  • This makes it possible to distinguish characteristic magnitudes of an incident radiation field-for example the intensity-as a function of the angle of incidence.
  • the embodiment of the device according to the invention thus enables a spatial segmentation of the monitoring area in that light beams from different spatial segments of the monitoring area are imaged onto different diodes of the array and can be detected independently by these diodes.
  • the array comprises at least two, but preferably a significantly larger number of photodiodes.
  • the resolution of spatial segmentation depends on the number and density of photodiodes on the array. The denser the photodiodes are arranged on the array and the greater the number of photodiodes, the finer the segmentation and the higher the resolution of the cha characteristic of an incident radiation field according to the angle of incidence.
  • a photodiode array can have a relatively high number and density of photodiodes, for example in the form of a segmented photosensitive layer.
  • the control unit is designed to control the emitter unit.
  • control unit By controlling the emitter unit by the control unit, it is first possible to activate the emitter unit only if, for example, by other means an increased probability for a trapping case is verified or this is increased by system state itself. For example, for a vehicle window, optical anti-jamming protection need only be active when the window is just closed, still open, and less than a predetermined minimum amount from the closed position, but not in the steady state closed state, or when the window is being opened ,
  • the control unit is expediently designed to trigger the emitter unit in a pulsed manner.
  • control unit By pulsed control of the emitter unit via the control unit, it is possible to emit reference signals with a special signature, for example with a special intensity modulation, via the emitter unit, which are identified by the detector unit and classified accordingly, so that storerooms - such as background radiation - can be hidden.
  • the control unit functions in this sense as an electronic interface between the control unit and the detector unit.
  • the emitter unit comprises a number of light-emitting diodes or a number of laser diodes, which preferably radiate in the infrared range.
  • the emitter unit comprises an optical system for directional radiation, so that the spatial area detected by the emission field can already be restricted to such an extent that both the predetermined monitoring area is completely detected and the deviation between the detected area is completely determined.
  • the area covered and the surveillance area are as small as possible. Focussing the emission field makes sense to keep the energy and processing costs as low as possible.
  • this optic which is realized in this embodiment preferably in the form of a cylindrical lens, is designed to produce a substantially fan-shaped beam.
  • a fan-shaped focused beam bundle makes sense, which can be achieved, for example, by means of a cylindrical lens.
  • the radiation beam of the emission field can be fanned out in two dimensions to such an extent that the Monitoring range is just within the space area, which is detected by the beam bundle.
  • control unit is advantageously configured to detect an obstacle in a monitoring area by an intensity distribution deviating from a reference pattern predetermined as a function of the angle of incidence and / or a spatially inhomogeneous intensity change of the radiation field incident from the spatial area on the basis of a Comparing the output signals of different photodiodes of the array to capture.
  • a spatially inhomogeneous change in intensity is referred to as a temporal change in the incident light radiation on the photodiode array, which precipitates differently for different spatial regions of the photodiode array, in particular for different photodiodes of the array. This criterion is fulfilled in particular when the light intensities registered for different photodiodes change simultaneously in a significantly non-proportional manner.
  • the respective intensities determine the current strengths of the output signals of the respective photodiodes, which are further processed for evaluation.
  • the anti-pinch protection device is independent of the absolute incident light intensity and thus independent of the illumination energy due to the comparative intensity evaluation.
  • the sensitivity of the device to absolute fluctuations in brightness and temperature-dependent varying operating characteristics of the emitter unit and the detector unit is thus effectively reduced.
  • the detection of spatially inhomogeneous intensity changes makes it easier to distinguish between locally limited obstacles, for example a hand held in the closing path of a vehicle window, with respect to defects such as a sudden change in background brightness.
  • a stationary illumination determined by the circumstances of the surroundings or for the background radiation, it is characteristic that the radiation intensity varies substantially spatially homogeneously in time.
  • a spatially inhomogeneous temporal change in the radiation conditions is caused by a spatially limited, moving obstacle in the monitoring area, which leads to a different, non-proportional temporal change in the registered intensity at different photodiodes of the array.
  • the comparative intensity evaluation has an especially advantageous effect on reliable detection of comparatively small and / or weakly reflecting obstacle objects whose influence is easily masked by strong background radiation during an absolute evaluation of the radiation detected in the detector unit, and thus can be overlooked.
  • the comparative Intensitatsausêt is therefore an effective tool to distinguish temporal changes in the background radiation per se of temporal changes of the radiation field by a movable obstacle in the monitoring area and thus better to detect a possible obstacle case even in unfavorable lighting conditions.
  • a further advantageous embodiment of the optical anti-pinching device relates to the configuration of the sensor chip of the detector unit.
  • the sensor chip comprises a number of integrated preprocessing circuits, each preprocessing circuit being set up for independent preprocessing of an output signal of a photodiode of the array.
  • the mutual association of photodiodes and preprocessing circuits is selectable or adjustable by a programmable interface interposed between the photodiode array and the circuits.
  • the interface is preferably designed such that by programming always exactly one (in particular any) photodiode can be uniquely assigned to a preprocessing circuit.
  • the interface can also be embodied such that a plurality of photodiodes connected in parallel can be assigned to a common preprocessing circuit.
  • the pre-processing contains one or more processing steps with which the output signal of the associated photodiode is prepared for the subsequent evaluation in the control unit.
  • the pre-processing comprises in particular - individually or in any combination - an analog-to-digital conversion, a gain or a temporal cumulation of the output signal.
  • Accumulation is understood as meaning a summation of the output signal of the assigned photodiode over a predetermined number of readout cycles. The cumulation thus essentially corresponds to an exposure time setting.
  • each of the preprocessing circuits is designed to generate and output a measurement signal characteristic for the duration of a reflected light pulse by correlating the output signal of the associated photodiode with a reference signal.
  • Such a monitoring area is imaged into a substantially one-dimensional image area, ie in a more or less broad line on the photodiode array, but which is usually curvilinear in accordance with the geometry of the monitoring space.
  • the monitoring area, and thus also the image area are generally different for each specific application of the anti-pinch device, for example for the type of vehicle in which the device is to be used. To be able to use the device while avoiding custom-made for as many cases of application, it is therefore recognized in the sense of efficient production makes sense to provide the photodiode array with a sufficiently large-sized photodiode array covering the image areas of the usual monitoring application areas to be monitored areas.
  • a two-dimensional array having a rectangular photodiode array comprising a number of rows and a number of columns
  • one photodiode from each row or column of the array can be uniquely assigned to a preprocessing circuit.
  • FIG. 1 shows in a block diagram an optical anti-pinch device with an optoelectronic assembly, comprising an emitter unit and a detector unit, and with a control unit
  • FIG. 2 shows a perspective view of a first embodiment of the anti-pinch device in which a sensor peripheral board comprising the control unit is laterally parallel to a sensor surface the optoelectronic assembly is applied to the same,
  • FIG. 3 in an illustration according to FIG. 2 an alternative embodiment of the anti-pinch device, in which the sensor peripheral board lies laterally orthogonal to the sensor surface on the optoelectronic assembly,
  • FIG 4 shows a detailed perspective view of the optoelectronic assembly
  • FIG 5 shows a perspective view of an execution of the detector unit with a programmable sensor chip.
  • FIG. 1 shows an optical anti-pinch device 1 is shown schematically, which is used for example as part of a power window for a vehicle window.
  • the device 1 comprises an optoelectronic assembly 2 and a control unit 3.
  • the control unit 3 in turn comprises an emitter unit 4 and a detector unit 6.
  • a fan-shaped beam 10 is emitted into a space region 12 with the aid of a focusing optics 8.
  • a monitoring area 14 is defined within which intrusive objects are to be recognized as an obstacle.
  • the detector unit 6 comprises an imaging optical system 16 and a sensor chip 17 connected downstream thereof in the light incident direction.
  • a (light) radiation field 18 incident from the spatial region 12 is imaged onto the sensor chip 17.
  • the radiation field 18 usually contains reflected portions of the radiation beam 10 as well Shares of coming from the space area 12 background radiation.
  • a radiation pulse 22 of the radiation beam 10 emitted by the emitter unit 4 strikes the obstacle 20 and is scattered by it. A portion 24 of the beam pulse 22 is reflected back to the detector unit 6.
  • the radiation pulse 22 and thus also its reflected component 24 have as a signature a short-time intensity modulation, so that the detector unit 6 can identify the component 24 in the incident radiation field 18 with a uniform or at most long-term varying background radiation.
  • the portion 24 is directed by the imaging optics 16 on the sensor chip 17 and detected there.
  • the control unit 3 controls the emitter unit 4 by means of a modulation voltage U for the emission of periodically intensity-modulated beam pulses whose signature is determined by the modulation voltage U. Furthermore, the modulation voltage U is transmitted as a reference size U ⁇ to the detector unit 6.
  • the detector unit 6 processes (on demand following the near-described manner) a proportion of the detected radiation 24 corresponding measurement signal with the reference Large U ⁇ and derives therefrom a resulting detector output signal U ⁇ ⁇ to the control unit 3 on. It contains information about the amplitude and thus the light intensity of the reflected portion 24, as well as information about the direction of incidence of the portion 24.
  • the control unit 3 determines the distance and location of the obstacle 20 and verifies whether the obstacle 20 is located in the predetermined monitoring area 14. If this is the case, the control unit 3 transmits an identification signal Id to further means, for example the activation of the window lifter, which then stops or inverts the feed of the vehicle window.
  • the optoelectronic assembly 2 has a substantially parallelepiped-shaped housing 25.
  • the emitter unit 4 and the detector unit 6 emerge here with the respectively associated optics 8 and 16 on a side surface of the housing 25, which is referred to below as sensor surface 26 .
  • the device 1 additionally comprises, in addition to the module 2, a sensor peripheral board 28, which comprises at least parts of the control unit.
  • the sensor peripheral board 28 is aligned in this embodiment parallel to the sensor surface 26 and disposed adjacent to one of these opposite side surface 30 of the housing 25.
  • the housing 25 has a height a of 25 mm, a width b of 10 mm, and a length c of about 50 mm.
  • the device 1 is suitable, for example, for the mentioned use as window anti-pinching system in a vehicle.
  • the anti-pinch system 1 is hereby mounted with the adjacent sensor peripheral board 28 on a stationary relative to the vehicle window substrate.
  • the illustrated in Figure 3 embodiment of the device 1 is substantially identical in construction to the embodiment described above, but differs from the latter in that here the sensor peripheral board 28 is orthogonal to the sensor surface 26 of the module 2 is aligned, and thus approximately perpendicular from the side surface 30 of the housing 25 protrudes.
  • the optoelectronic assembly 2 is shown in relation to FIG 1 in detailer representation. Visible are the two spaced apart from the high a Genzoufactwande the
  • the emitter unit 4 comprises a number of light-emitting diodes 32, which are aligned in such a way that they scatter the light emanating from the light-emitting diodes 32 into the fan-shaped beam 10 with the aid of the focusing optics 8 in the form of a cylindrical lens ,
  • the imaging optics 16 of the detector unit 6 is formed according to FIG 4 by a convex lens.
  • the sensor chip 17 comprises a here one-dimensional array 34 of photodiodes 36.
  • the illustration shows the beam paths 38 and 39, which impinge on respectively different photodiodes 36 in the space region 12 via the optical system 16 from one endpoint of the obstacle 20 shown here as an elongated object.
  • the spatial region 12 is segmented, the resolution being determined by the number of photodiodes 36 on the array 34, which each deliver an output signal I.
  • the sensor chip 17 comprises an array 44 of photodiodes 45, 46, which are arranged in rows 47 and columns 48 in the form of a two-dimensional matrix.
  • the array 44 is preceded by a number of preprocessing circuits 49, the number of preprocessing circuits 49 corresponding to the number of lines 47 of the array 44.
  • a programmable interface 50 assigns one photodiode 46 from each of the lines 47 to exactly one of the preprocessing circuits 49.
  • an output signal of such a photodiode 46 is preprocessed in the correspondingly assigned preprocessing circuit 49 and transmitted to the control unit 3.
  • the further photodiodes 45 of the array 44 are decoupled from the preprocessing circuits 49 by the configuration of the interface 49, so that the output signals I of these photodiodes 45 are not further processed.
  • the thus activated photodiodes 46 form a one-dimensional contour on the two-dimensional array 44, by virtue of which the beam path 51 of the imaging optical system 16 defines the correspondingly contoured monitoring region 14 in the spatial region 12.
  • the control unit 3 compares changes in the light intensities measured by different photodiodes 46 with one another, and detects the presence of an obstacle 20 if it detects a significant change in the light intensity which is spatially inhomogeneous, ie not of all the photodiodes 46 in the same or corresponding manner was detected.

Abstract

L'invention concerne un dispositif optique de sécurité antipincement (1), comprenant une unité émettrice (4) qui, aux fins d'émission de rayonnement, est installée dans une zone spatiale (12), une unité détectrice (6) pour détecter un champ de rayonnement (18) provenant de la zone spatiale (12), et une unité de commande (3) pour déceler un obstacle (20) situé dans une zone de surveillance (14) prédéterminée dans la zone spatiale (12) par évaluation des signaux de sortie (U'') de l'unité détectrice (6). L'unité détectrice (6) comprend une optique d'imagerie (16) et une puce de capteur (17) dotée d'un réseau bidimensionnel (34) de photodétecteurs (36).
PCT/EP2008/051768 2007-03-23 2008-02-14 Dispositif optique de sécurité antipincement WO2008116697A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007014033.0 2007-03-23
DE102007014033A DE102007014033A1 (de) 2007-03-23 2007-03-23 Optische Einklemmschutzvorrichtung

Publications (1)

Publication Number Publication Date
WO2008116697A1 true WO2008116697A1 (fr) 2008-10-02

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Application Number Title Priority Date Filing Date
PCT/EP2008/051768 WO2008116697A1 (fr) 2007-03-23 2008-02-14 Dispositif optique de sécurité antipincement

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DE (1) DE102007014033A1 (fr)
WO (1) WO2008116697A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19907547A1 (de) * 1998-03-17 1999-09-30 Leuze Electronic Gmbh & Co Optoelektronische Vorrichtung
WO2001056142A1 (fr) * 2000-01-31 2001-08-02 Prospects, Corp. Verrouillage de securite pour dispositif de fermeture mecanique
US6271512B1 (en) * 1998-04-13 2001-08-07 Infineon Technologies Corporation Optical system for detecting obstruction
DE10025897A1 (de) * 2000-05-25 2001-12-06 Sick Ag Optoelektronische Sensoranordnung sowie Verfahren zum Betreiben einer optoelektronischen Sensoranordnung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5955854A (en) 1992-09-29 1999-09-21 Prospects Corporation Power driven venting of a vehicle
DE19742093A1 (de) * 1997-09-24 1999-03-25 Kostal Leopold Gmbh & Co Kg Photoelektrisches Sensorarray
FR2845165B1 (fr) * 2002-09-26 2004-12-24 Arvinmeritor Light Vehicle Sys Detecteur d'obstacle pour ouvrant de vehicule automobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19907547A1 (de) * 1998-03-17 1999-09-30 Leuze Electronic Gmbh & Co Optoelektronische Vorrichtung
US6271512B1 (en) * 1998-04-13 2001-08-07 Infineon Technologies Corporation Optical system for detecting obstruction
WO2001056142A1 (fr) * 2000-01-31 2001-08-02 Prospects, Corp. Verrouillage de securite pour dispositif de fermeture mecanique
DE10025897A1 (de) * 2000-05-25 2001-12-06 Sick Ag Optoelektronische Sensoranordnung sowie Verfahren zum Betreiben einer optoelektronischen Sensoranordnung

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Publication number Publication date
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