DE102005027087A1 - Fog sensor, for motor vehicle, has light receiver detecting light that is reflected from inner side of windscreen, where light receiver is arranged behind of black impression of windscreen - Google Patents
Fog sensor, for motor vehicle, has light receiver detecting light that is reflected from inner side of windscreen, where light receiver is arranged behind of black impression of windscreen Download PDFInfo
- Publication number
- DE102005027087A1 DE102005027087A1 DE102005027087A DE102005027087A DE102005027087A1 DE 102005027087 A1 DE102005027087 A1 DE 102005027087A1 DE 102005027087 A DE102005027087 A DE 102005027087A DE 102005027087 A DE102005027087 A DE 102005027087A DE 102005027087 A1 DE102005027087 A1 DE 102005027087A1
- Authority
- DE
- Germany
- Prior art keywords
- light
- light receiver
- sensor according
- fitting
- windshield
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000011156 evaluation Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 4
- 230000005693 optoelectronics Effects 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000002313 adhesive film Substances 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000001953 sensory effect Effects 0.000 description 2
- 206010047571 Visual impairment Diseases 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 208000029257 vision disease Diseases 0.000 description 1
- 230000004393 visual impairment Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
- B60H1/00785—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models by the detection of humidity or frost
-
- 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
- G01N21/552—Attenuated total reflection
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
- G01N2021/155—Monitoring cleanness of window, lens, or other parts
- G01N2021/157—Monitoring by optical means
-
- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/062—LED's
- G01N2201/0624—Compensating variation in output of LED source
Landscapes
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft einen Beschlagsensor für ein Kraftfahrzeug, mit einem auf die Innenseite der Windschutzscheibe strahlenden Lichtsender und einem das von der Innenseite der Windschutzscheibe reflektierte Licht erfassenden Lichtempfänger.The The present invention relates to a hardware sensor for a motor vehicle, with a light emitter radiating on the inside of the windshield and one that reflected off the inside of the windshield Light-detecting light receiver.
Durch Beschlag an der Windschutzscheibe wird die Sicht des Fahrers verschlechtert, da kleine Wassertröpfchen zu diffuser Lichtstreuung führen und so die Erkennbarkeit des Außenraumes für den Fahrer sicherheitsrelevant eingeschränkt werden kann. Die diffuse Lichtstreuung bedeutet, daß weniger Lichtintensität aus den ursprünglichen Transmissions- und Reflexionsrichtungen der Scheibe, aber mehr Lichtintensität aus anderen Richtungen auf die Augen des Fahrer fällt.By Fog on the windscreen worsens the driver's vision, there small water droplets lead to diffuse light scattering and so the recognizability of the outside space for the driver safety relevant restricted can be. Diffuse light scattering means less Light intensity from the original ones Transmission and reflection directions of the disc, but more light intensity from others Directions for the driver's eyes.
In modernen Kraftfahrzeugen werden oftmals Feuchtesensoren mit kapazitiven oder resistiven Wirkprinzipien eingesetzt, die aufkommenden Beschlag an der Windschutzscheibe erkennen sollen. Dadurch können Geräte (Gebläse, Heizung, Klimaanlage, Frontscheibenheizung o. ä.) aktiviert und so der Beschlag automatisch entfernt werden.In Modern motor vehicles are often moisture sensors with capacitive or resistive principles of action, the emerging fitting to recognize the windshield. This allows devices (fans, heating, Air conditioning, windshield heating o. Ä.) Activated and so the fitting be removed automatically.
Der Einsatz von Feuchtesensoren zur Erkennung von Beschlag hat Nachteile:
- – Feuchte ist nur ein indirekter Indikator von Beschlag,
- – Feuchtesensoren messen an einer speziell präparierten Sensoroberfläche, nicht an der Windschutzscheibe, so daß von einer unterschiedlichen Benetzung mit Feuchtigkeit auszugehen ist,
- – Feuchtesensoren reagieren üblicherweise recht träge.
- – Feuchtesensoren sind recht kostenaufwendig.
- - humidity is just an indirect indicator of fogging,
- - Humidity sensors measure on a specially prepared sensor surface, not on the windshield, so that a different wetting with moisture is assumed,
- - Humidity sensors usually react quite slowly.
- - Humidity sensors are quite expensive.
Zur
Detektion des Beschlages kann die Verminderung der direkten Lichtreflexion
oder die Erhöhung
der diffusen Lichtreflexion an der Scheibeninnenseite gemessen werden.
Aus der
Die Aufgabe der Erfindung bestand darin, einen Beschlagsensor für ein Kraftfahrzeug zu schaffen, der sich durch einen einfachen und kostengünstigen Aufbau sowie durch eine hohe Meß- und geringe Störempfindlichkeit auszeichnet.The The object of the invention was a fitting sensor for a motor vehicle to create, through a simple and inexpensive Structure as well as a high measuring and low susceptibility to interference distinguished.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Sensor hinter der Schwarzbedruckung der Windschutzscheibe angeordnet ist.These Task is inventively characterized solved, that the Sensor located behind the black print of the windshield is.
Der vorgeschlagene Beschlagsensor mißt beispielsweise die Intensität des von der Windschutzscheibeninnenseite reflektierten Lichts. Wenn für den Menschen erkennbarer und damit störender Beschlag auftritt, nimmt diese Intensität ab, weil Licht vermehrt in andere Richtungen gestreut wird. Dabei ist die Meßempfindlichkeit so hoch, daß Maßnahmen gegen den Beschlag aktiviert werden können, noch bevor die Sichtbeeinträchtigung vom Fahrer bewußt wahrgenommen wird.Of the proposed fitting sensor measures, for example, the intensity of the windshield inside reflected light. If for man recognizable and thus disturbing fitting occurs, this intensity decreases because light is increasingly scattered in other directions. It is the measuring sensitivity so high that measures against the fitting can be activated, even before the visual impairment consciously perceived by the driver becomes.
Erfindungsgemäß können Fremdlichteinflüsse minimiert werden, indem im Bereich der Schwarzbedruckung gemessen wird. Dabei wird zudem eine Beeinflussung der Messung durch Regen, Verschmutzung o.ä. auf der Scheibenaußenseite durch die Schwarzbedruckung ausgeschlossen.According to the invention, extraneous light influences can be minimized by measuring in the area of black printing. there will also affect the measurement by rain, pollution etc. on the outside of the window excluded by the black printing.
Vorteilhaft ist, daß der Beschlagsensor aus nur wenigen optoelektronischen und elektronischen Bauelementen besteht, so daß er kostengünstig herstellbar ist.Advantageous is that the Fog sensor from only a few optoelectronic and electronic components exists, so that he economical can be produced.
Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen beschrieben.advantageous Refinements and developments of the invention are described in the dependent claims.
Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung dargestellt und näher erläutert. Die einzige Figur zeigt in einer schematischen Darstellung den Aufbau eines Beschlagsensors.in the The following will be an embodiment of Invention illustrated with reference to the drawing and explained in more detail. The only figure shows in a schematic representation of the structure of a fitting sensor.
Auf
einer ebenen Leiterplatte (
Neben
der LED (
Eine
erste auf der Leiterplatte (
Eine
zweite Fotodiode (
Hierzu
kann beispielsweise entweder das Meßsignal der ersten Fotodiode
(
Das
Meßprinzip
des Beschlagsensors besteht darin, daß die LED (
Bei
Beschlagbildung auf der Innenseite der Windschutzscheibe (
Hierdurch
wird die auf die sensierende Fläche
der ersten Fotodiode (
Alternativ kann auch vorgesehen werden, den Lichtempfänger in einem größeren Abstand zum Lichtsender oder vom Lichtsender durch eine optische Abschirmung getrennt so anzuordnen, daß kein oder nur sehr wenig direkt reflektiertes Licht auf ihn fällt. In diesen Ausführungen wird nicht die Abnahme einer von der Windschutzscheibe auf den Lichtempfänger reflektierten Lichtintensität, sondern statt dessen die Zunahme der von der Windschutzscheibe diffus in Richtung auf den Lichtempfänger gestreuten Lichtintensität zur Beschlagserkennung herangezogen.alternative can also be provided, the light receiver at a greater distance to the light emitter or the light emitter through an optical shield to be arranged separately so that no or only very little directly reflected light falls on him. In these statements is not the decrease of a reflected from the windshield on the light receiver Light intensity, but instead the increase of the windshield diffused towards the light receiver scattered light intensity used for detection of fittings.
Eine
weitere Möglichkeit
zur Realisierung eines Beschlagsensors besteht darin, zwei Lichtempfänger vorzusehen,
wobei ein erster Lichtempfänger (
Da
zur Beschlagerkennung gegenläufige Meßsignale
an den Lichtempfängern
auftreten, ist diese Ausführung
vorteilhafterweise unempfindlich gegenüber Intensitätsschwankungen
des Lichtsenders (
Um
die Meßempfindlichkeit
des dargestellten Sensors zu erhöhen
und diesen insbesondere vor störendem
Fremdlichteinfluß und
vor direkten und diffusen Reflexionen von der Außenseite der Windschutzscheiben
(
Aus
Sicherheitsgründen
bestehen Windschutzscheiben von Kraftfahrzeugen bekanntermaßen aus
mehreren miteinander verbundenen Teilscheiben (
Unmittelbar
hinter dieser Schwarzbedruckung (
Durch Ausnutzung der Schwarzbedruckung der Windschutzscheibe kann so ein optischer Beschlagsensor mit einer hohen Meßempfindlichkeit und einer geringen Störempfindlichkeit realisiert werden.By Exploitation of the blackprint of the windshield can be such optical fitting sensor with a high measuring sensitivity and a low susceptibility to interference will be realized.
- 11
- WindschutzscheibeWindshield
- 1a, 1b1a, 1b
- TeilscheibenDividing plates
- 22
- SchwarzbedruckungSchwarzbedruckung
- 33
- Fotodiodephotodiode
- 44
- Lichtsender (LED)light source (LED)
- 55
- optische Abschirmungoptical shielding
- 66
- Fotodiodephotodiode
- 77
- Schaltungsträger (Leiterplatte)Circuit carrier (printed circuit board)
Claims (16)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005027087A DE102005027087A1 (en) | 2005-06-11 | 2005-06-11 | Fog sensor, for motor vehicle, has light receiver detecting light that is reflected from inner side of windscreen, where light receiver is arranged behind of black impression of windscreen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005027087A DE102005027087A1 (en) | 2005-06-11 | 2005-06-11 | Fog sensor, for motor vehicle, has light receiver detecting light that is reflected from inner side of windscreen, where light receiver is arranged behind of black impression of windscreen |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102005027087A1 true DE102005027087A1 (en) | 2006-12-14 |
Family
ID=37440040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102005027087A Withdrawn DE102005027087A1 (en) | 2005-06-11 | 2005-06-11 | Fog sensor, for motor vehicle, has light receiver detecting light that is reflected from inner side of windscreen, where light receiver is arranged behind of black impression of windscreen |
Country Status (1)
Country | Link |
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DE (1) | DE102005027087A1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2020569A3 (en) * | 2007-08-01 | 2010-03-10 | odelo GmbH | Headlamp system with controlled and/or regulated defogging system |
CN104125907A (en) * | 2011-12-24 | 2014-10-29 | 法雷奥开关和传感器有限责任公司 | Optical sensor with integrated moisture sensor |
EP3023768A1 (en) * | 2014-11-21 | 2016-05-25 | Hach Lange GmbH | A nephelometric turbidimeter and method for controlling the humidity of venting air in a nephelometric turbidimeter |
DE102015201188A1 (en) | 2015-01-23 | 2016-07-28 | Automotive Lighting Reutlingen Gmbh | Motor vehicle headlamps |
US10053059B1 (en) | 2017-10-04 | 2018-08-21 | Ford Global Technologies, Llc | Detection and identification of opaqueness of vehicle windows |
US10144356B2 (en) | 2017-03-24 | 2018-12-04 | Ford Global Technologies, Llc | Condensation detection for vehicle surfaces via light transmitters and receivers |
US11230266B2 (en) | 2017-09-11 | 2022-01-25 | Pilkington Group Limited | Sensor and glazing incorporating a sensor |
WO2023025891A1 (en) * | 2021-08-27 | 2023-03-02 | HELLA GmbH & Co. KGaA | Method and sensor device for detecting deposits on a pane |
EP4275982A1 (en) * | 2022-05-11 | 2023-11-15 | Toyota Jidosha Kabushiki Kaisha | Vehicle controller, method, and computer program for vehicle control |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3623356A (en) * | 1969-12-18 | 1971-11-30 | Eg & G Inc | Dew point hygrometer |
DE19631059A1 (en) * | 1996-08-01 | 1998-02-05 | Teves Gmbh Alfred | Optical sensor with self-monitoring of transparency of light aperture |
DE19716809A1 (en) * | 1997-04-22 | 1998-10-29 | Schwahn Systems Ges Fuer Autom | Measuring scattered light from screens especially vehicle screens |
DE19725287A1 (en) * | 1997-06-14 | 1998-12-17 | Itt Mfg Enterprises Inc | Rain sensor with bonded sensor chips |
EP0999104A2 (en) * | 1998-11-02 | 2000-05-10 | Central Glass Company, Limited | Water droplet sensor and exposure system for hologram |
-
2005
- 2005-06-11 DE DE102005027087A patent/DE102005027087A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3623356A (en) * | 1969-12-18 | 1971-11-30 | Eg & G Inc | Dew point hygrometer |
DE19631059A1 (en) * | 1996-08-01 | 1998-02-05 | Teves Gmbh Alfred | Optical sensor with self-monitoring of transparency of light aperture |
DE19716809A1 (en) * | 1997-04-22 | 1998-10-29 | Schwahn Systems Ges Fuer Autom | Measuring scattered light from screens especially vehicle screens |
DE19725287A1 (en) * | 1997-06-14 | 1998-12-17 | Itt Mfg Enterprises Inc | Rain sensor with bonded sensor chips |
EP0999104A2 (en) * | 1998-11-02 | 2000-05-10 | Central Glass Company, Limited | Water droplet sensor and exposure system for hologram |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2020569A3 (en) * | 2007-08-01 | 2010-03-10 | odelo GmbH | Headlamp system with controlled and/or regulated defogging system |
CN104125907A (en) * | 2011-12-24 | 2014-10-29 | 法雷奥开关和传感器有限责任公司 | Optical sensor with integrated moisture sensor |
EP3023768A1 (en) * | 2014-11-21 | 2016-05-25 | Hach Lange GmbH | A nephelometric turbidimeter and method for controlling the humidity of venting air in a nephelometric turbidimeter |
WO2016079259A1 (en) * | 2014-11-21 | 2016-05-26 | Hach Lange Gmbh | A nephelometric turbidimeter and method for controlling the humidity of venting air in a nephelometric turbidimeter |
US10408729B2 (en) | 2014-11-21 | 2019-09-10 | Hach Lange Gmbh | Nephelometric turbidimeter and method for controlling the humidity of venting air in a nephelometric turbidimeter |
DE102015201188A1 (en) | 2015-01-23 | 2016-07-28 | Automotive Lighting Reutlingen Gmbh | Motor vehicle headlamps |
US10144356B2 (en) | 2017-03-24 | 2018-12-04 | Ford Global Technologies, Llc | Condensation detection for vehicle surfaces via light transmitters and receivers |
US11230266B2 (en) | 2017-09-11 | 2022-01-25 | Pilkington Group Limited | Sensor and glazing incorporating a sensor |
US10053059B1 (en) | 2017-10-04 | 2018-08-21 | Ford Global Technologies, Llc | Detection and identification of opaqueness of vehicle windows |
WO2023025891A1 (en) * | 2021-08-27 | 2023-03-02 | HELLA GmbH & Co. KGaA | Method and sensor device for detecting deposits on a pane |
EP4275982A1 (en) * | 2022-05-11 | 2023-11-15 | Toyota Jidosha Kabushiki Kaisha | Vehicle controller, method, and computer program for vehicle control |
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OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
R005 | Application deemed withdrawn due to failure to request examination |
Effective date: 20120612 |