WO2009059978A1 - Dispositif détecteur optoélectronique pour un véhicule à moteur - Google Patents

Dispositif détecteur optoélectronique pour un véhicule à moteur Download PDF

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Publication number
WO2009059978A1
WO2009059978A1 PCT/EP2008/064955 EP2008064955W WO2009059978A1 WO 2009059978 A1 WO2009059978 A1 WO 2009059978A1 EP 2008064955 W EP2008064955 W EP 2008064955W WO 2009059978 A1 WO2009059978 A1 WO 2009059978A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
vehicle window
sensor device
optoelectronic sensor
light receiver
Prior art date
Application number
PCT/EP2008/064955
Other languages
German (de)
English (en)
Inventor
Alexander Braun
Matthias Richwin
Thomas Weber
Original Assignee
Leopold Kostal Gmbh & 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 Leopold Kostal Gmbh & Co. Kg filed Critical Leopold Kostal Gmbh & Co. Kg
Publication of WO2009059978A1 publication Critical patent/WO2009059978A1/fr

Links

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/43—Refractivity; Phase-affecting properties, e.g. optical path length by measuring critical angle
    • 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
    • B60S1/0837—Optical rain sensor with a particular arrangement of the optical elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • G01N2021/9586—Windscreens

Definitions

  • Optoelectronic sensor device for a motor vehicle
  • the invention relates to an optoelectronic sensor device for a motor vehicle for the differential detection of moisture and salt solutions on a vehicle window, with a lighting unit for irradiating light in a vehicle window and with a light receiver, which detects light reflected from the vehicle window, as well as with a coupling element for insertion. and coupling of light into and out of the vehicle window.
  • the light falls on the vehicle window at mainly a single angle of incidence. This angle is chosen so that the light is totally reflected on a dry vehicle window. When wetted, a portion of the light is extracted from the vehicle window, which reduces the intensity of the total reflected light. Although such a system recognizes wetting with both water and saline solutions, it does not distinguish between these types of wetting.
  • the first reflection path is provided for detecting a wetting of the vehicle window with water or salt
  • the second reflection path specifically allows the detection of a saline solution on the vehicle window.
  • Dissolved salts are also recognized only above a certain concentration, the value of which depends on the geometry of the reflection path provided for this purpose.
  • the illumination device irradiates light over an incident angle range in the vehicle window, which extends over several degrees that the light receiver has a plurality of receiving elements that an optical system reflects the light reflected by the vehicle window in a Ausfallswinkel Scheme light on receiving elements of the light receiver, and that the light receiver generates a signal from which an evaluation device determines the critical angle of total reflection on the vehicle window.
  • the optoelectronic sensor arrangement according to the invention provides a refractometer functionality in the manner of an Abbe refractometer. Depending on the refractive index of a wetting liquid, the maximum total reflection angle changes. This critical angle translates through the imaging optics in a local limit on the sensor, up to which a signal reduction takes place by canceling the total reflection. The location of this local limit on the sensor is again a direct measure of the salt concentration of the liquid on the vehicle window.
  • the wiping frequency and the wiping speed of the windshield wiper can be adjusted and thus a streaking on the disk can be reduced. Furthermore, it is possible to provide a control of the amount of washing water discharged by the mop washer.
  • the plurality of receiving elements can be realized in a particularly simple and cost-effective manner by a single CCD line.
  • a particularly advantageous embodiment of the optoelectronic sensor device is to provide an image sensor as a light receiver, which is embodied for example as a CCD matrix or generally as a camera chip.
  • Such an imaging sensor additionally allows a pictorial detection of the vehicle exterior, which can function unaffected by the rain and salt sensors described here.
  • FIG. 1 shows a schematic representation of an optoelectronic sensor device
  • Figure 2 shows the image of light bundles with different
  • FIG. 3 different angular ranges when light is transmitted to a vehicle window
  • Figure 4 optical sensor areas on a camera chip.
  • a lighting unit 1 couples via a coupling element 2, shown here as a simple prism, light in the vehicle window 3 of a motor vehicle.
  • the term "light” here does not refer exclusively to electromagnetic radiation in the visible wavelength range, but also to radiation in the adjacent wavelength ranges, and in particular to near infrared radiation It is advantageous if the light used has a relatively narrow spectrum, which by the use of one or more LED as a component (s) of the lighting unit 1 is easily and inexpensively feasible.
  • This lighting unit 1 may also have not shown here optical elements such.
  • a diffuser one or more imaging elements (lenses), optical filters or a holographic plate (Diffractive Optical Element, DOE).
  • the prism 2 has the function of light almost refraction in the
  • the wedge-shaped prism shown here 2 can of course have a much more complex structure in realizations, and be designed for example as a light guide, consisting of a plurality of individual prisms. A refraction of the light when entering and exiting the prism 2 is not shown in FIG.
  • the illumination device 1 does not emit the light at a single angle and not at a plurality of discrete angles, but instead as uniformly as possible over a relatively large angle of incidence range ⁇ in the vehicle window 3.
  • this incident angle range ⁇ corresponds at least to that angular range in which the incident light is totally reflected on a dry vehicle window 3.
  • the incident angle range ⁇ in this case has a size of about 25 ° or more.
  • the angle of incidence range ⁇ is chosen so that the total light incident on the vehicle window 3 is totally reflected on a dry vehicle window 3, the light falling in the angle of incidence ⁇ is reflected by the vehicle window 3 into a angle of emergence range ⁇ ', which is directly dependent on ⁇ ,
  • the light strikes an optical system 4 and then falls on a light receiver 5 having a plurality of individual receiving elements (not shown) and illuminates an area 8 on the light receiver 5.
  • the light receiver 5 is designed, for example, as a CCD line or preferably as a camera chip.
  • the optical system 4 can advantageously be formed by a camera lens or generally a lens system consisting of one or more lenses.
  • FIG. 2 schematically shows the beam path of light which strikes the optical system 4 from different directions.
  • a first Light bundle 6a which is shown by solid lines and a second light bundle 6b, which is shown by dashed lines fall from different directions of incidence on the optical system 4 and are imaged by the optical system 4 at different locations (9a, 9b) of the light receiver 5 , Consequently, the optical system 4 has the property of translating the angle information given by the incident direction of a light beam (6a, 6b) into a location information.
  • a substance wetting the outside of the vehicle window 3 can decouple light from the vehicle window 3, which would be totally reflected by the vehicle window 3 on an unwetted outside. Whether or not light is coupled out depends on the one hand on the direction of irradiation of the light in the vehicle window 3 and on the other hand on the refractive index of the wetting substance (and also on the refractive index of the vehicle window 3, which is to be assumed to be a constant size). Therefore, two light paths are provided in the German patent application DE 10 2005 013 021 A1, in order to be able to distinguish a wetting of the vehicle window with water and with a saline solution. The underlying functional principle is briefly described below.
  • the critical angle of total reflection ß c is given by the refractive indices of the inner medium n, and outer medium n a :
  • the refractive index n of pure water just above 0 ° C is about 1.329.
  • the relative change of the refractive index by changing the concentration c of the dissolved NaCl can be described by
  • dnldc 0.178.
  • the maximum concentration is about 26 mass percent. This results in a range of the refractive index of saline solutions near 0 ° C of about 1.329 to 1.375.
  • Range a from 0 ° to about 41, 8 ° to the slotted solder. There is no here
  • Total reflection takes place. Range b from about 41, 8 ° to about 62.3 ° to the Scheibenlot. Total reflection takes place only with a dry disc. Any wetting with water or saline will couple light. Range c from about 62.3 ° to about 66.5 ° to the Scheibenlot. Total reflection takes place with a dry disc and wetting with pure water. Only when wetting with a saline solution takes place coupling.
  • Range d from about 66.5 ° to 90 ° to the Scheibenlot.
  • the concretely chosen irradiation angle in the region c determines the minimum necessary salt concentration at which decoupling takes place. At an angle just above 62.3 °, a low salt concentration is sufficient; at an angle just below 66.5 °, a high salt concentration must be present.
  • concentration of the saline solution on the vehicle window is dried, the concentration of the saline solution increases monotonically, so that in any case a range of high salt concentration is achieved.
  • Solid sodium chloride on the vehicle window causes complete suppression of total reflection since its refractive index is greater than that of glass unless an air gap forms between the glass and the NaCl crystallites. Due to the generally rough surface of the salt layer, the light is scattered, so that the intensity at the receiver of the optical path decreases greatly.
  • the optical system 4 forms the angle of incidence range ⁇ ', under which light is reflected by the vehicle window 3, onto a region 8 on the sensor surface of the light receiver 5. If now by wetting of the vehicle window 3 the Ausfallswinkel Scheme ⁇ ', under the light from the vehicle window 3 is totally reflected, so decreases in accordance with the lit on the light receiver 5 area 8. Since the critical angle of total reflection is a function of the refractive index of the wetting material the vehicle window 3 is the width of the illuminated
  • Area 8 on the light receiver 5 suitable for determining the refractive index.
  • vehicle window 3 wetting medium is generally only water or, possibly slightly contaminated, saline in
  • the salt concentration of a wetting of the vehicle window can be determined quantitatively from the refractive index.
  • the salt concentration thus results directly from the critical angle of total reflection, which in turn can be determined from the position of the light-dark boundary on the surface of the light receiver 5.
  • the quantitative value of the salt concentration of the wetting is determined by the
  • Evaluation device 7 determines and can be used, for example, for an adapted control of the windshield wipers and the mop wash. Examples include the control of the windshield wiper frequency and the automatic control of the amount of wash water. In addition, the evaluation device 7 can provide the data of the vehicle windscreen wetting to other devices, not described here, in the motor vehicle.
  • a camera chip can be used. It is particularly advantageous that a part of the sensor surface of the camera chip for the pictorial detection of the vehicle exterior 10 may be provided. As FIG. 1 illustrates on the basis of the beam path illustrated by means of a dotted line, this area of the camera chip 5 is not influenced by the area 8 for detecting the total reflection on the vehicle window 3.
  • the area B is illuminated by light in the angular range of about 41, 8 ° to about 62.3 °.
  • the wetting of the vehicle window 3 with both water and saline solution leads to a reduction in the amount of light falling on the area B.
  • a salt-crystal layer also reduces the amount of light.
  • the area D on the camera chip 5 remains always illuminated when moistened with water or saline, as the total reflection is not canceled.
  • a solid salt-crystal layer reduces the amount of light.
  • a suitable evaluation algorithm can now distinguish between a wetting of the vehicle window 3 with normal water or a saline solution by considering the signal break-in both in the area B and in the area C.
  • the salt content in the salt solution can be determined quantitatively.
  • the refractive index depends on the exact salt concentration, and thus defines a spatial limit of the area C on the camera chip 5. Based on this insight, for example, the wiper speed can be adjusted to the salinity with better efficiency.
  • the area D it can be ascertained whether a liquid is still present on the vehicle window 3 or whether a solid salt-crystal layer has already formed. Only in the case of a salt layer is from the Vehicle window 3, the light for area D decoupled, otherwise the area must always remain illuminated.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un dispositif détecteur optoélectronique pour véhicule à moteur, destiné à une détection différenciée de l'humidité et des solutions salines sur une vitre d'un véhicule, dispositif comprenant une unité d'éclairage pour le rayonnement de lumière dans une vitre du véhicule, et un récepteur de lumière qui détecte la lumière réfléchie, ainsi qu'un élément de couplage pour l'entrée et la sortie dans la vitre du véhicule ou à partir de cette vitre. L'invention est caractérisée en ce que l'unité d'éclairage émet un rayonnement dans la vitre du véhicule, via une plage d'angles d'incidence s'étendant sur de multiples degrés d'angle, en ce que le récepteur de lumière présente une pluralité d'éléments récepteurs, en ce qu'il est prévu un système optique reproduisant, sur des éléments récepteurs du récepteur de lumière, la lumière réfléchie par la vitre du véhicule, sur une plage d'angles de sortie, et en ce que le récepteur de lumière génère un signal à partir duquel un dispositif d'évaluation détermine l'angle limite de réflexion totale sur la vitre du véhicule.
PCT/EP2008/064955 2007-11-06 2008-11-04 Dispositif détecteur optoélectronique pour un véhicule à moteur WO2009059978A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007052704.9 2007-11-06
DE102007052704.9A DE102007052704B4 (de) 2007-11-06 2007-11-06 Optoelektronische Sensoreinrichtung für ein Kraftfahrzeug

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Publication Number Publication Date
WO2009059978A1 true WO2009059978A1 (fr) 2009-05-14

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PCT/EP2008/064955 WO2009059978A1 (fr) 2007-11-06 2008-11-04 Dispositif détecteur optoélectronique pour un véhicule à moteur

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DE (1) DE102007052704B4 (fr)
WO (1) WO2009059978A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9678029B2 (en) 2014-08-22 2017-06-13 Honeywell International Inc. Oxidation catalyst detector for aircraft components

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018206548A1 (de) * 2018-04-27 2019-10-31 Robert Bosch Gmbh Verfahren zur Detektion von Beschädigungen und/oder Verunreinigungen auf einem transparenten Abdeckmaterial eines optoelektronischen Sensors, System, optoelektronischer Sensor und Fortbewegungsmittel
DE102019203230A1 (de) * 2019-03-11 2020-10-22 Robert Bosch Gmbh Sensorvorrichtung umfassend ein Sensorelement und eine Abschlussscheibe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19539422A1 (de) * 1995-10-24 1997-04-30 Docter Optik Wetzlar Gmbh Verfahren und Vorrichtung zur Feststellung der Lichtdurchlässigkeit von lichtdurchlässigen Scheiben
EP0893319A2 (fr) * 1997-07-22 1999-01-27 Nippon Sheet Glass Co. Ltd. Dispositif de contrÔle d'essuie-glace
DE19801745A1 (de) * 1998-01-20 1999-07-22 Itt Mfg Enterprises Inc Vorrichtung zur Überwachung des Zustands einer Fensterscheibe
DE10117397A1 (de) * 2001-04-06 2002-10-10 Valeo Auto Electric Gmbh Sensor zur Detektion von Schmutz und/oder Feuchtigkeit auf einer Außenseite einer Scheibe
EP1705086A1 (fr) * 2005-03-22 2006-09-27 Leopold Kostal GmbH & Co. KG Dispositif de détection opto-électronique pour véhicule automobile

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
JPS62163949A (ja) * 1986-01-14 1987-07-20 Sharp Corp 光学式液体検出センサ
DE10025789A1 (de) * 2000-05-19 2001-11-22 Schmidt & Haensch Gmbh & Co Op Refraktometer
US6396576B1 (en) * 2001-02-27 2002-05-28 Leica Microsystems Inc. Method for determining shadowline location on a photosensitive array and critical angle refractometer employing the method
WO2003012408A1 (fr) * 2001-07-30 2003-02-13 Nippon Sheet Glass Co., Ltd. Capteur optique de condensation et appareil de commande employant ce capteur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19539422A1 (de) * 1995-10-24 1997-04-30 Docter Optik Wetzlar Gmbh Verfahren und Vorrichtung zur Feststellung der Lichtdurchlässigkeit von lichtdurchlässigen Scheiben
EP0893319A2 (fr) * 1997-07-22 1999-01-27 Nippon Sheet Glass Co. Ltd. Dispositif de contrÔle d'essuie-glace
DE19801745A1 (de) * 1998-01-20 1999-07-22 Itt Mfg Enterprises Inc Vorrichtung zur Überwachung des Zustands einer Fensterscheibe
DE10117397A1 (de) * 2001-04-06 2002-10-10 Valeo Auto Electric Gmbh Sensor zur Detektion von Schmutz und/oder Feuchtigkeit auf einer Außenseite einer Scheibe
EP1705086A1 (fr) * 2005-03-22 2006-09-27 Leopold Kostal GmbH & Co. KG Dispositif de détection opto-électronique pour véhicule automobile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9678029B2 (en) 2014-08-22 2017-06-13 Honeywell International Inc. Oxidation catalyst detector for aircraft components

Also Published As

Publication number Publication date
DE102007052704B4 (de) 2021-04-01
DE102007052704A1 (de) 2009-05-07

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