WO2014127776A1 - Dispositif optique de détection de pluie pour un véhicule - Google Patents

Dispositif optique de détection de pluie pour un véhicule Download PDF

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Publication number
WO2014127776A1
WO2014127776A1 PCT/DE2014/200045 DE2014200045W WO2014127776A1 WO 2014127776 A1 WO2014127776 A1 WO 2014127776A1 DE 2014200045 W DE2014200045 W DE 2014200045W WO 2014127776 A1 WO2014127776 A1 WO 2014127776A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
radiation source
vehicle
wavelength range
sensor device
Prior art date
Application number
PCT/DE2014/200045
Other languages
German (de)
English (en)
Inventor
Stefan Bix
Dieter KRÖKEL
Dirk Ulbricht
Marc Fischer
Stefan Menzel
Boris Werthessen
Original Assignee
Conti Temic Microelectronic 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 Conti Temic Microelectronic Gmbh filed Critical Conti Temic Microelectronic Gmbh
Priority to DE112014000929.6T priority Critical patent/DE112014000929A5/de
Publication of WO2014127776A1 publication Critical patent/WO2014127776A1/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
    • 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
    • G01N21/55—Specular reflectivity

Definitions

  • the invention relates to an optical rain sensor device for a vehicle according to the preamble of patent claim 1.
  • Rain sensor devices for vehicles are known and are usually arranged in the region of the interior mirror behind the windshield of a vehicle and are optically coupled to this.
  • a light reflected at the outer side of the disk portion is one of a light source, he testified ⁇ light beam is de- tektiert of a photovoltaic element as a detector. Since there is a moisture covering on the outside of the pane for partial decoupling of the
  • a measure of the amount of moisture on the disk is obtained, which can be used to generate a signal for controlling a windshield wiper of the vehicle.
  • light sources are usually infrared or white light emitting
  • LED Light emitting diodes
  • the light beam generated as a measuring beam can be coupled into the windshield of the vehicle so that when the windshield is dry at the interface to the outside
  • WO 2012/092911 AI Another measuring principle is disclosed in WO 2012/092911 AI by the applicant, which relates a rain sensor device with a camera applied for driver assistance functions with an image sensor designed as a CCD or CMOS sensor and a sensor which is directed onto a windshield of a vehicle
  • Light beam generating light source describes.
  • the light beam generated by the light source is so directed to the wafer so that each part beam is reflected both on the inside and on the Au ⁇ zseite incident as spatially separated beams on the image sensor of the camera.
  • the amounts of light of these two partial beams are measured by the camera, wherein the partial beam reflected on the inside of the disc serves as a reference signal, since the amount of light of this partial beam remains constant in the presence or absence of raindrops on the outside of the disc.
  • the object of the invention is therefore to provide an optical rain sensor device of the type mentioned in such a way that under all environmental conditions, the emergence of disturbing for the driver and other road users
  • Such an optical rain sensor device for a vehicle comprising at least one optical radiation source and a detector, wherein a vehicle wheel in a measuring section ⁇ is arranged reasonable between the radiation source and the detector and at least one of the radiation source it ⁇ witnessed light beam at an interface of the Vehicle window to the outside of the detector in the detector as a moisture ⁇ keitsmenge indicating on the vehicle windshield first part ⁇ beam
  • the radiation source is designed to emit light ⁇ rays with different wavelengths such that at large Ambient brightness a light beam at least substantially in the green wavelength range and at low ambient brightness, a light beam substantially in the blue wavelength range to the near UV wavelength range and / or substantially in the red wavelength range to the near IR wavelength range is generated.
  • this solution according to the invention exploits the knowledge that scattered light at high ambient brightness, that is to say in the day
  • the coupled light beam having wavelengths from the green wavelength range is generated (about 490 nm to about 575 nm), can not be perceived by the human eye because its sensitivity due to the adaptation to light is interpreting ⁇ Lich reduced and therefore the active illumination in the measuring section is not perceptible or at least only so perceivable that this can not be distracting.
  • the invention makes use of the knowledge that the sensitivity of the human eye is rich in the near UV range or in the transition to this UV range as well as in the near IR range or in the transition to this near IR range is significantly reduced, so that in particular at night, so with low ambient brightness such light with Wavelengths from these areas is barely perceptible to the human eye.
  • the Wel ⁇ lenus of the light beam generated by the radiation source is adjusted in function of the ambient brightness, that the set is ⁇ on the ambient brightness sensitivity of the human eye, the scattered light generated from the injected light beam is not, or at least perceived only slightly.
  • the radiation source is designed such that at high ambient brightness ⁇ a light beam in the visible wavelength range is generated.
  • a scattered light generated by such a light beam which appears at high brightness, ie during the day as white light, can hardly be perceived by the human eye .
  • the sensitivity of the detector increases with such a light beam in the visible range, in particular if an image sensor of a vehicle camera is used as the detector.
  • a measuring device for generating an ambient light ⁇ nals depending on the ambient brightness of the vehicle and a control unit which controls the light output of the radiation source in response to the ambient light signal, that with increasing ambient brightness, the light output of the radiation source increases and with decreasing ambient brightness, the light output of the radiation source is lowered.
  • a green or white light beam with high light output can be generated whose scattered light can no longer be perceived at such a high ambient brightness.
  • a light beam with high light output leads to increased sensitivity of the detector, in particular when an image sensor of a vehicle camera is used as the detector.
  • Versa ⁇ is at low ambient brightness, particularly at night reduces the light output of the light beam and thereby further reduces the visibility of the scattered light of such a light beam by the human eye, WO-in, however, a sufficient useful signal for the detector on ⁇ due to the wavelengths used at low Ambient brightness (in the blue wavelength range up to the near UV wavelength range and / or in the red wavelength range up to the near IR wavelength range) is maintained.
  • Light beam is reflected at an interface of the inside of the vehicle ⁇ disc as a second partial beam into the detector. Since the luminous intensity of this second partial beam does not depend on the amount of moisture on the windshield, the value of the light intensity detected by the detector can be used as a measure of the light output of the radiation source.
  • the image sensor of a vehicle assistant camera associated with a driver assistance system of the vehicle for the rain sensor device according to the invention.
  • the evaluation of the two sub-beams as well as the evaluation of the image data recorded by the vehicle environment is not spatially separated, but temporally separated.
  • the radiation source is driven at intermittent time intervals and the image data of the vehicle surroundings are detected and evaluated by means of an image evaluation unit for the first and second partial beams reflected on the image sensor as detector during the time intervals and outside these time intervals.
  • the measuring device for generating the ambient light Signals represents.
  • a separate ambient light sensor can be used as a radiation source for the rain sensor device
  • LED Light emitting diodes
  • these light emitting diodes of the radiation source are controlled such that at high ambient brightness of the blue and yellow LEDs together the light beam is generated, which has a white color substantially ⁇ , and at low ambient brightness is generated only by the blue light emitting diodes of the light beam.
  • Figure 1 is a schematic block diagram of a Regensen ⁇ sorvoroplasty as an embodiment of the invention.
  • Figure 2 is a schematic representation of an image sensor of a camera of the rain sensor device of Figure 1 with for rain sensing and the
  • the rain sensor device 1 according to FIG. 1 is located on a windshield 4 of a schematically indicated one
  • Vehicle 10 and comprises a radiation source 2 and a vehicle camera 3, which in a common housing (not shown) housed and attached to the windshield is coupled.
  • This vehicle camera 3 with an image evaluation ⁇ unit 6 and an image sensor 3.1, eg., A CCD or CMOS image chip detects the lying ahead of the vehicle 10 around part of a driver assistance system (eg. Fernlichtassis- assistance system, traffic sign recognition system, lane recognition system, etc.) and therefore focused on the far range.
  • a driver assistance system eg. Fernlichtassis- assistance system, traffic sign recognition system, lane recognition system, etc.
  • the rain sensor function of this rain sensor device 1 is produced by means of the signal generated by the radiation source 2 and bundled punched light beam a which is directed onto the windshield ⁇ disc 4, that on the outside, the Grenzflä of the ⁇ surface of the interface 4.2 of the windscreen 4 4.1 of the windshield 4 rays reflected to the inside as two spatially separated partial beams e (first partial beam) and b (second partial beam) of the generated by the radiation source 2 beam a impinge on the image sensor 3.1 of the camera 3. Only one light beam a is shown in FIG. 1, but a plurality of light beams a generated by a plurality of light-emitting diodes are generated, as will be explained in greater detail below.
  • Partial beam d or d y decoupled amount of light depends on the Benet degree of the windshield 4 with moisture, symbolically indicated in Figure 1 with a water droplet 5 from.
  • a clotting ⁇ ger proportion of light of the partial beam c with the light beam d from ⁇ is only coupled, while when wetting with water, 5 of the predominant part of the partial beam c from the windscreen 4 is coupled out with the partial beam d y , whereby the amount of light arriving in the image sensor 3.1 with the partial beam e is reduced in comparison with a dry windshield 4.
  • the reflected at the inner boundary surface 4.1 partial beam b is not affected by whether the windshield 4 is wet with moisture or not, but has a constant light intensity of only the Lichtintensi ⁇ ty of the light beam a, that of the light output
  • Radiation source 2 depends.
  • the measured amount of light of the partial beam e is a measure of the Benet degree of the windshield 4 with moisture and can be used by comparison with thresholds for controlling a windshield wiper.
  • An evaluation is also possible by using both partial beams b and e by comparing their light intensities and thus in the case of wetting of the windshield 4 with moisture, the reduced amount of light of the partial beam e can be determined.
  • the image sensor is 3.1 of the vehicle camera 3 both for the realization of a driver assistance ⁇ tenzfunktion as part of a driver assistance system as well as the rain sensor function described.
  • this image sensor 3.1 serves on the one hand to detect the surroundings of the vehicle 10 and on the other hand to detect the reflected partial beams b and e.
  • the camera image for the driver assistance function must not be disturbed by the light bundle pairs b and e. Therefore, these detection ranges for the driver assistance function and the rain sensor function on the image sensor 3.1 are spatially separated, as example, ⁇ is shown in Figure 2.
  • This figure 2 shows schematically the image sensor 3.1 of the vehicle camera 3 with an upper part 3.1a, which serves as a detector for the rain sensor function, and a used for the summarizeassis ⁇ tenzfunktion lower part 3.1b, which shows an image of lying in front of the vehicle 10 environment ,
  • the spectral sensitivity of the image sensor 3.1 is limited to the range sensitive to the human eye, that is to say between approximately 380 nm and approximately 780 nm.
  • the radiation source 2 consists of a plurality of light-emitting diodes (LED), which emit light in different wavelength ranges.
  • LED light-emitting diodes
  • a control unit 7 is controlled such that a signal generated by the light beam a in the windscreen 4 stray light by the driver or by other road part ⁇ holders is not or at least hardly perceptible.
  • a light beam a with wavelengths from the green wavelength range (approx.
  • This green wavelength range for high ambient brightness can also be extended to the wavelength range of visible light with white color. In this wavelength range, the image sensor 3.1 of the Vehicle camera 3 the highest sensitivity, whereby a high useful signal for the rain sensor function is generated.
  • the radiation source 2 is controlled by the control unit 7 such that a light beam a with wavelengths from the near UV range (about 380 nm to about 415 nm) or in the transition to this UV range and / or from the near IR region (about 780 nm to about 1400 nm) or in the transition to this near IR region.
  • the color may be blue (about 420 nm to about 490 nm) emitting ⁇ de LEDs 2a and the color yellow (about 575 nm to about 585 nm) emitting light-emitting diodes are used 2b so that the light-emitting diodes 2a produce a blue light beam al and the yellow light-emitting diodes 2b generate a light beam a2.
  • the control unit 7 controls both the blue light emitting diodes 2a and the yellow light emitting diodes 2b so that a blue light beam a1 and the yellow light beam a2 a light beam a with white Color is generated.
  • the yellow emitting LEDs 2b are turned off by the control unit 7, so that only the blue light ⁇ beam al of the blue light emitting diodes 2a is used as light beam a for rain sensing. Also in this wavelength area of blue light is only a small SENS ⁇ friendliness of the human eye, so that the use of sol ⁇ chen blue light emitting diodes 2a has an Al produced by the light beam scattered light by the driver of the vehicle or check the traffic participants is hardly perceptible, but of the provided for the detection of the light beams b and e part 3.1a of the image sensor 3.1 a sufficient Nutzsig ⁇ nal is delivered.
  • a measure of the ambient brightness in the form of a U Conversely ⁇ bung light signal is supplied from the image sensor 3.1 namely from its intended for the driver assistance function part 3.1b and the control unit 7 is supplied for evaluation. Alternatively, a separate ambient light sensor (not shown in Figure 1) are used for determining the ambient brightness ⁇ U.
  • the number of light-emitting diodes are used to the two sub-beams b and e corresponding lighting reflexes PI and P2 displayed on the upper part of the 3.1a Schmsen ⁇ sors 3.1 according to FIG.
  • each with seven light emitting diodes 2a and 2b are used as the radiation source 2 ⁇ the, so that in each case a pair of blue and yellow light emitting diodes 2a and 2b generate a light beam a, together, are for the two sub-beams b and e are each seven lighting reflexes PI and P2 detected, wherein the upper row of the illumination reflections PI of the partial beam b and the lower row of the illumination reflections P2 of the partial beam e are generated.
  • the amount of light of the illumination reflexes P2 thus serves as a measure of the amount of water on the windshield 4.
  • FIG. 2 shows two pairs of illumination reflexes P3 whose two illumination reflexes P2 each show a lower signal strength, that is to say the associated partial rays e. reason of water 5 on the windshield 5 have a smaller amount of light than the other illumination reflections.
  • the realization of a detector function for the rain sensor function can also by temporal separation of the evaluation of the light reflexes PI and P2 on the one hand and carried out of the Schmaus ⁇ evaluation in the context of driver assistance function.
  • an image of the illumination reflexes PI and P2 can be recorded alternately with the recorded image of the vehicle surroundings.
  • the light emitting diodes 2a and 2b of the radiation source 2 is switched off by the control unit 7, and turned on for receiving the rain sensor image again turned on where ⁇ in function of the ambient brightness, either all light emitting diodes 2a and 2b, or only the light-emitting diodes 2a become.
  • the light output of the radiation source 2 is controlled by means of the control unit 7 as a function of the ambient light signal U generated as a function of the ambient brightness U. This serves to further improve the property of the rain sensor ⁇ device 1 with respect to a non-perception or reduced perception of stray light to the human eye.
  • Radiation source 2 controls such by the control unit 7 that increases with increasing ambient brightness U, the light output of the radiation source 2 and with decreasing ambient ⁇ brightness, the light output 2 of the radiation source ernied ⁇ rigt.
  • the light output of the radiation source 2 is determined on the basis of the inner at the interface 4.1 of the windscreen 4 Reflectors ⁇ oriented partial beam b whose light amount inde- gig of a mecanicsbeet tion of the windshield 4 is.
  • the light output of the light beam a consisting only of the light beam a2 of the light emitting diodes 2a is reduced, thereby further reducing the perceptibility of the scattered light of such a light beam by the human eye, but a sufficient useful signal for the image sensor 3.1 is retained due to the wavelengths used, here the color blue.

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

Abstract

L'invention concerne un dispositif optique de détection de pluie (1), destiné à un véhicule (10), qui comprend au moins une source de rayonnement optique (2) et un détecteur (3.1a). Une vitre (4) du véhicule est disposée dans un trajet de mesure entre la source de rayonnement (2) et le détecteur (3.1a) et au moins un rayon lumineux (a) généré par la source de rayonnement (2) est réfléchi au niveau d'une interface (4.2) de la vitre (4) du véhicule en direction de sa face extérieure dans le détecteur (3.1a) en tant que premier rayon partiel (e) indiquant la quantité d'humidité présente sur la vitre (4) du véhicule. Selon l'invention, la source de rayonnement (2) est adaptée pour émettre des rayons lumineux (a) à différentes longueurs d'onde de façon à générer un rayon lumineux (a) au moins en majeure partie dans le domaine de longueur d'onde du vert lorsque la luminosité ambiante est forte et un rayon lumineux (a) en majeure partie dans le domaine de longueur d'onde du bleu au proche ultraviolet et/ou en majeure partie dans le domaine de longueur d'onde du rouge au proche infrarouge lorsque la luminosité ambiante est faible.
PCT/DE2014/200045 2013-02-21 2014-02-05 Dispositif optique de détection de pluie pour un véhicule WO2014127776A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112014000929.6T DE112014000929A5 (de) 2013-02-21 2014-02-05 Optische Regensensorvorrichtung für ein Fahrzeug

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310101746 DE102013101746A1 (de) 2013-02-21 2013-02-21 Optische Regensensorvorrichtung für ein Fahrzeug
DE102013101746.0 2013-02-21

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WO2014127776A1 true WO2014127776A1 (fr) 2014-08-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110217069A (zh) * 2018-03-01 2019-09-10 法雷奥开关和传感器有限责任公司 用于机动车的传感器装置及具有传感器装置的机动车

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9245333B1 (en) 2014-12-10 2016-01-26 Semiconductor Components Industries, Llc Systems and methods for detecting obstructions within the field-of-view of an image sensor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006008274A1 (de) * 2006-02-22 2007-08-23 Siemens Ag Kraftfahrzeug mit einer optischen Erfassungsvorrichtung
EP2189340A2 (fr) * 2008-11-24 2010-05-26 Robert Bosch GmbH Module de caméra doté de fonctions multiples
WO2012092911A1 (fr) 2010-11-30 2012-07-12 Conti Temic Microelectronic Gmbh Détection de gouttes de pluie sur une vitre au moyen d'une caméra et d'un éclairage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006008274A1 (de) * 2006-02-22 2007-08-23 Siemens Ag Kraftfahrzeug mit einer optischen Erfassungsvorrichtung
EP2189340A2 (fr) * 2008-11-24 2010-05-26 Robert Bosch GmbH Module de caméra doté de fonctions multiples
WO2012092911A1 (fr) 2010-11-30 2012-07-12 Conti Temic Microelectronic Gmbh Détection de gouttes de pluie sur une vitre au moyen d'une caméra et d'un éclairage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110217069A (zh) * 2018-03-01 2019-09-10 法雷奥开关和传感器有限责任公司 用于机动车的传感器装置及具有传感器装置的机动车

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DE112014000929A5 (de) 2015-11-26
DE102013101746A1 (de) 2014-08-21

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