WO2006015905A1 - Module optique pour un systeme d'assistance au conducteur operant une detection dans l'espace exterieur avant, dans le sens de roulement, d'un vehicule a moteur - Google Patents

Module optique pour un systeme d'assistance au conducteur operant une detection dans l'espace exterieur avant, dans le sens de roulement, d'un vehicule a moteur Download PDF

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Publication number
WO2006015905A1
WO2006015905A1 PCT/EP2005/052942 EP2005052942W WO2006015905A1 WO 2006015905 A1 WO2006015905 A1 WO 2006015905A1 EP 2005052942 W EP2005052942 W EP 2005052942W WO 2006015905 A1 WO2006015905 A1 WO 2006015905A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical module
motor vehicle
windshield
semiconductor element
sensitive surface
Prior art date
Application number
PCT/EP2005/052942
Other languages
German (de)
English (en)
Inventor
Henryk Frenzel
Thorsten KÖHLER
Stephan Voltz
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2006015905A1 publication Critical patent/WO2006015905A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
    • B60S1/0833—Optical rain sensor
    • B60S1/0844—Optical rain sensor including a camera
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V20/00—Scenes; Scene-specific elements
    • G06V20/50—Context or environment of the image
    • G06V20/56—Context or environment of the image exterior to a vehicle by using sensors mounted on the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
    • B60R2300/10—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used
    • B60R2300/108—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used using 'non-standard' camera systems, e.g. camera sensor used for additional purposes i.a. rain sensor, camera sensor split in multiple image areas

Definitions

  • Optical module for an assistance system which detects the outer vestibule in the direction of travel of a motor vehicle
  • the invention relates to an optical module of an outer space in the direction of travel of a motor vehicle detecting assistance system, with a circuit carrier; a semiconductor element arranged on the circuit carrier; and a lens unit for projecting electromagnetic radiation onto a sensitive surface of the semiconductor element.
  • Camera applications are finding more and more application in the motor vehicle of the near future. Many assistive systems are conceivable for which one or more cameras must look ahead through the windshield. Examples include: lane detection or monitoring applications, night vision applications, obstacle warning, pre-crash sensing, automatic speed adaptation, congestion assist, pedestrian and cyclist protection, traffic sign recognition, parking assistance and the like.
  • the optical module of a monocamera or the optical modules must have a "clear view" to the front. They should also be protected from contamination, i. as uninfluenced by rain, snow and dirt can work. A preferred place is therefore in the interior behind the windshield.
  • rain sensors in the foot section of the holder for the mirror surface of an interior rear-view mirror.
  • These emit, for example, an infrared light directed obliquely through the pane, which is guided through the windshield and reflected on the outer pane surface.
  • Receiver diodes especially photodiodes, receive the reflected light.
  • the infrared light reaches the receiving diode almost at full strength, so-called total reflection.
  • An electronic control recognizes die ⁇ this S ⁇ gnaldifferenz that there are drops of water on the windshield and controls accordingly the wiper system.
  • the sensor system Since these measurements are to be made permanently within the wiping range, the sensor system detects the intensity of the precipitate. Accordingly, it controls single wiping operations as well as wiping intervals with optimal interval cycles and continuous wiping at different speeds. After current generations of rain sensors work with infrared light, the sensor can also be housed in a blackened area of the windscreen. This makes the rain sensor virtually invisible from the outside.
  • an optical module that is to say an optical lens system with a sensor for recording two-dimensional or three-dimensional images
  • image acquisition sensors in the foot section of the support for the mirror surface of an interior rear-view mirror are therefore much more problematic.
  • the rain sensor has already been placed at this point; in general, very little installation space is present at this point, if, for example, the entire electronics, in particular from cost and production points of view, should be arranged in the mirror base or not close to it.
  • the line length can not be arbitrarily long, because the driver power is regularly limited.
  • the invention is based on generic optical modules in that the sensitive surface of the semiconductor element has a multiplicity of light-sensitive cells (pixels) which temporarily and / or at least partly also detect the proximity of the windshield of the motor vehicle, advantageously also in the so-called Blurred area.
  • pixels light-sensitive cells
  • the present invention is based on the idea that one and the same sensitive surface is used cyclically, ie temporarily, advantageously for realizing an exterior space assist function and a rain functionality, namely according to the invention alternatively or cumulatively for the partial use of light-sensitive cells (US Pat. Pi ⁇ xel), eg the use of partial image areas.
  • an optical exposure means is provided for this purpose, for example a focal plane shutter which cyclically alternately alternates at least part of the light-sensitive cells (pixels) of the sensitive area of the semiconductor element for the outer vestibule .
  • the motor vehicle sometimes exposed to the vicinity of the windshield.
  • the present invention makes use of the idea that often only a relatively few lines of photosensitive cells (pixels) of the sensitive area of the semiconductor element of an optical module are required for the aforementioned assistance systems, but the full number of gaps.
  • Conventional sensitive surfaces of the semiconductor element often simply referred to as an image sensor, have, for example, a ratio of columns to rows of 4: 3 (eg VGA640x480).
  • the present invention therefore also proposes, for the first time, the partial image area which is not needed for the assistance function.
  • at least one second projection means is arranged in the beam path of the optical module, which focuses at least part of the light-sensitive cells (pixels) of the sensitive surface of the semiconductor element onto the near zone of the windshield of the motor vehicle.
  • the second projection means is designed as a close-up optics.
  • the second projection means is a partial conversion lens.
  • the focusing of at least part of the photosensitive cells (pixels) of the sensitive area of the semiconductor element onto the near area of the windshield of the motor vehicle can finally also be achieved by means of an optical beam splitter or a semitransparent mirror.
  • a robust rain sensor functionality can be realized when the light source and optics are arranged accordingly.
  • the effect is exploited that at the points where a Re- grafting, no total reflection at the disc takes place, but that light is deflected in different directions and thus a lower signal is detectable.
  • infrared light sources have proven to be suitable as sources of illumination for the near field.
  • suitable projection means or sequences have been realized for the first time, which i.a. the viewing area, which is required for the driver assistance maps to a sensor area with a suitable depth of focus and at the same time a sufficiently large area of Wind ⁇ protection disc of the motor vehicle partially maps to another ⁇ sensor area.
  • This has the advantage that the camera system for driver assistance completely assumes the functions of the rain sensor.
  • the classic rain sensor is thus superfluous and can advantageously be omitted.
  • FIG. 1 shows a first realization of the invention
  • Fig. 2 shows a second embodiment of the invention
  • Fig. 3 shows a third realization of the invention.
  • Lane detection often requires relatively few lines of a camera 1, but the full number of columns.
  • conventional image sensors 12 have a ratio of columns to rows of e.g. 4: 3 (e.g., VGA640x480).
  • the image area which is not suitable for the driver assistance radio
  • Fig. 1 shows such a realization of the invention according to the principle of beam splitting.
  • the light-sensitive cells (pixels) of the sensitive surface 34 are split up of the semiconductor element 12 to electromagnetic radiation from the main beam path 50 (observation of the road) and to electromagnetic radiation from the sub-beam path 51 (focus on the windshield 40).
  • the mirror 28 directs about 86 to 94% of the electromagnetic radiation from the outer vestibule 50 of the motor vehicle and 6 to 14% of the electromagnetic radiation from the near zone 51 of the windshield 40 on the photosensitive cells (pixels) of the sensitive surface 34 of the semiconductor element 12th from.
  • An alternative solution is, instead of the deflection mirror 28, which can be provided for only a part of the sensor surface 34, to provide a beam splitter, which reads a large part of the light for the far range (eg 90%) and a part of (eg 90 °). coupled (eg 10%), which is focused on an optics 28 on the near zone 51.
  • a reference sensor functionality By means of a suitable illumination source (LED), with a corresponding arrangement of the light source 5 and the optic 28, a reference sensor functionality can be realized.
  • LED illumination source
  • the effect is exploited that at the points on which there is a rain drop, no total reflection takes place on the disk 40, but that light is deflected in different directions and thus a lower signal can be detected.
  • Fig. 2 shows such an implementation of the invention.
  • an additional Nahfeld ⁇ optics 24 introduced, which realizes the focus on a near area 51 of the windshield 40 and at the same time the evaluation of the light beams fed through an LED 5 and thus an evaluation in rain / no rain allowed.
  • the near-vision 24 can also cooperate with a partial objective lens 26. But it can also only one optics 14; 16, 18, 20; 21 used for the distance 50, and a partial front lens 28 are brought into the beam path, which focuses at least parts of the sensor surface 34 to the near zone 51.
  • FIG. 3 shows a further realization of the invention.
  • one or more LEDs 5 are used to temporally define or modulate an evaluable light at the height of the main beam path into the windshield 40.
  • a corresponding blurred image occurs, which as a defined reflection pattern before an evaluation in rain Yes / No allow. Due to the number and size of the reflection patterns, it is also possible to deduce the degree of visual impairment, which permits an "intelligent" control of a windshield wiper (not shown), taking advantage of the fact that when the windshield is dry, all the rays with angle are larger about 42 ° are totally reflected and wet disk 40 total reflection only at angles greater about 62 °.
  • CMOS image sensors By using a sensor with a synchronous shutter, it is also possible to expose all light-sensitive cells (pellets) at a time, and thus to synchronize them with the IR light source 5. This advantageously makes it possible to suppress background light such as sunlight, since the light source 5 is pulsed with increased current only for a short time (eg between 80 ⁇ s and 120 ⁇ s, in particular with 100 ⁇ s) and also the sensitive surface 34 of the semiconductor element 12 only for a short time exposed.
  • a short time eg between 80 ⁇ s and 120 ⁇ s, in particular with 100 ⁇ s
  • the Regensensor ⁇ function possibly only a small part of the sensitive surface 34 of the semiconductor element 12 used and / or only a small exposure time is required, the image data of a few milliseconds can within * "(for example, between 1 ms un, d 2ms) perennial- be men.
  • a relatively low update rate is necessary for a rain sensor system (eg between 500 ms and 1 ms), so that in addition to a driver assistance function, it is advantageously possible to realize a reverse sensor function with relatively little computational effort without adversely affecting the overall timing. influence.
  • the camera is able to extend the windshield wiper function via an intelligent software evaluation. This allows the camera to control the wiping function more intelligently via the size, speed and intensity, etc. of the drops or snow. Furthermore, it is conceivable to counteract the detection of upcoming "water events" on the windshield 40 in advance: if, for example, an overtaking car bends in front of one's own vehicle during rain, rain is to be expected immediately Even when overtaking, especially of trucks in the rain, haze can be detected, so that the windshield wiping process is started before the visibility is poor.
  • the present invention is based on the main idea that a camera system for driver assistance completely assumes the functions of a rain sensor. The rain sensor is thus no longer necessary and deleted.
  • the optical module according to the invention allows a better and more intelligent functionality, since the image of the camera or the module rather corresponds to the human senses. Both, human and camera, try to look through the glass. Only software can be used for a first evaluation - it rains. Finally, predictive windscreen wiping can also be detected, e.g. Retraction in haze of trucks during overtaking or the like.
  • the present invention is excellently suited as an application in existing motor vehicle optical assistance systems such as lane detection or monitoring applications, night vision applications, obstacle warning, pre-crash sensing, automatic speed adaptation, congestion assist, pedestrian and cyclist contactor, Traffic character recognition, or the like more.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Studio Devices (AREA)

Abstract

Module optique (1) d'un système d'assistance au conducteur opérant une détection dans l'espace extérieur avant (50), dans le sens de roulement, d'un véhicule à moteur, qui comporte un support (10) de circuit, un élément semi-conducteur (12) placé sur le support (10) de circuit et une unité à lentilles (14; 16, 18) destinée à projeter un rayonnement électromagnétique sur une surface sensible (34) de l'élément semi-conducteur (12). Ledit module se caractérise en ce que la surface sensible (34) de l'élément semi-conducteur (12) comporte une pluralité de cellules sensibles à la lumière (pixels) qui opèrent une détection temporairement et / ou tout au moins partiellement, également dans la zone (51) située à proximité du pare-brise (40) du véhicule. La présente invention a permis pour la première fois la mise au point de moyens ou séquences de projection adaptés qui reproduisent entre autres la zone optique nécessaire pour assister le conducteur sur une zone de capteur ayant une profondeur de champ adaptée, et reproduisent en même temps partiellement une zone suffisamment importante du pare-brise du véhicule sur une autre zone du capteur. L'avantage est que le système de caméras pour l'assistance au conducteur assume totalement les fonctions de détecteur de pluie, ce qui rend superflu le capteur de pluie classique qui peut donc être avantageusement éliminé.
PCT/EP2005/052942 2004-08-04 2005-06-23 Module optique pour un systeme d'assistance au conducteur operant une detection dans l'espace exterieur avant, dans le sens de roulement, d'un vehicule a moteur WO2006015905A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004037871.1 2004-08-04
DE102004037871A DE102004037871B4 (de) 2004-08-04 2004-08-04 Optisches Modul für ein den Außenvorraum in Fahrtrichtung eines Kraftfahrzeuges erfassendes Assistenzsystem

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WO2006015905A1 true WO2006015905A1 (fr) 2006-02-16

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DE (1) DE102004037871B4 (fr)
WO (1) WO2006015905A1 (fr)

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DE102006008274A1 (de) * 2006-02-22 2007-08-23 Siemens Ag Kraftfahrzeug mit einer optischen Erfassungsvorrichtung
EP1923695A1 (fr) 2006-11-20 2008-05-21 Delphi Technologies, Inc. Dispositif destiné à l'enregistrement de l'humidité sur un disque
EP2062777A1 (fr) 2007-11-21 2009-05-27 Delphi Technologies, Inc. Module optique
EP2020350A3 (fr) * 2007-07-25 2010-05-26 Robert Bosch Gmbh Système d'enregistrement de signaux optiques à l'aide d'un capteur de pluie et procédé
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WO2011153978A3 (fr) * 2010-06-11 2012-02-16 Conti Temic Microelectronic Gmbh Élément optique pour représentation multifocale dans une caméra destinée à des applications automobiles
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DE102021123944A1 (de) 2021-09-16 2023-03-16 Valeo Schalter Und Sensoren Gmbh Kameravorrichtung zum anbringen an einem fenster eines fahrzeugs, fahrzeug und verfahren zum betreiben einer kameravorrichtung

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Cited By (34)

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Publication number Priority date Publication date Assignee Title
DE102006008274A1 (de) * 2006-02-22 2007-08-23 Siemens Ag Kraftfahrzeug mit einer optischen Erfassungsvorrichtung
DE102006008274B4 (de) 2006-02-22 2021-11-25 Continental Automotive Gmbh Kraftfahrzeug mit einer optischen Erfassungsvorrichtung und Verfahren zum Betreiben eines Kraftfahrzeugs
EP1923695A1 (fr) 2006-11-20 2008-05-21 Delphi Technologies, Inc. Dispositif destiné à l'enregistrement de l'humidité sur un disque
EP2020350A3 (fr) * 2007-07-25 2010-05-26 Robert Bosch Gmbh Système d'enregistrement de signaux optiques à l'aide d'un capteur de pluie et procédé
EP2050637A3 (fr) * 2007-10-18 2010-11-03 Valeo Schalter und Sensoren GmbH Module de capteur et son procédé de fonctionnement
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