DE2420594A1 - Sensor system for detecting wetting of motor vehicle windscreen - uses light beam which is totally internally reflected when windscreen is dry - Google Patents

Sensor system for detecting wetting of motor vehicle windscreen - uses light beam which is totally internally reflected when windscreen is dry

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Publication number
DE2420594A1
DE2420594A1 DE2420594A DE2420594A DE2420594A1 DE 2420594 A1 DE2420594 A1 DE 2420594A1 DE 2420594 A DE2420594 A DE 2420594A DE 2420594 A DE2420594 A DE 2420594A DE 2420594 A1 DE2420594 A1 DE 2420594A1
Authority
DE
Germany
Prior art keywords
prism
optical
cathetus
wetting
windscreen
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.)
Pending
Application number
DE2420594A
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German (de)
Inventor
Bernd Ing Grad Korndoerfer
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE2420594A priority Critical patent/DE2420594A1/en
Publication of DE2420594A1 publication Critical patent/DE2420594A1/en
Pending legal-status Critical Current

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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
    • B60S1/0837—Optical rain sensor with a particular arrangement of the optical elements
    • 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
    • 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
    • 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

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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)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

A light source is placed on one side of a rectangular optical prism, and a photoelectric transducer on the other, so that by use of additional means, such as mirrors and lenses with a diaphragm, a parallel light beam is produced perpendicular to the prism cathetuses and spread if possible over the whole cathetus surface; it is reflected by total reflection from the outer surface of the tested glass plate, to whose inner surface the prism hypotenuse surface is cemented by an optical cement; the beam is partly diverted outward by wetting of the outer surface. Alternatively, two similar prisms with the same auxiliary equipment are used, so that the beam of light is reflected several times by the glass plate surfaces before it emerges from the second prism.

Description

Vollautomatische Sc-heibenwischersteuerung für Kraftfahrzeuge Die Erfindung betrifft Sensorandordnungen zur Messung von optischen Oberflächenveränderungen auf Glasscheiben infolge von Benetzung mit Flüssigkeiten.Fully automatic windshield wiper control for motor vehicles The The invention relates to sensor arrangements for measuring optical surface changes on glass panes as a result of wetting with liquids.

Durch die starke Verkehrsbelastung des Fahrzeugführers bedeutet die laufende Betätigung des Scheibenwischers bei leichtem Regen in Verbindung mit plötzlichem Bespritzen der Windschutzscheibe durch nasse Straßen während Ùberhol- oder Gegenverkehr eine unnötige Mehrbelastung.Due to the heavy traffic of the vehicle driver, this means continuous operation of the windscreen wiper in light rain combined with sudden Splashing of the windshield from wet roads while overtaking or oncoming traffic an unnecessary additional burden.

Durch ein selbständiges Ein- und Ausschalten des Scheibenwischers in Abhängigkeit von der Transparenz der Windschutzscheibe kann dies vermieden werden.By automatically switching the windshield wiper on and off depending on the transparency of the windshield, this can be avoided.

Seit längerem sind im Handel sogenannte Intervallschalter erhältlich, mit deren Hilfe in vorwählbaren Abständen der Scheibenwischer betätigt wird.So-called interval switches have been available in stores for a long time, with the help of which the windshield wiper is operated at preselectable intervals.

Eine Weiterentwicklung des Intervallschalters in Form einer besseren Erfassung des benötigten Intervalls aus der Schalterbetätigung des Fahrzeugführers wurde in letzter Zeit angemeldet (Fachhochschule Ulm, Dr. Künzel).A further development of the interval switch in the form of a better one Acquisition of the required interval from the switch actuation by the vehicle driver has recently been registered (University of Applied Sciences Ulm, Dr. Künzel).

Alle Intervalltechniken funktionieren nur gut bei gleichbleibendem Benetzungsgrad der Scheibe. Durch die Dynamik des Verkehrs besteht jedoch ständig die Gefahr des überraschenden Bespritzens der Windschutzscheibe und im Extremfall genau dann, wenn der Fahrer keine Hand frei hat (Schaltvorgang), was unter Umständen sogar zur Katastrophe führen könnte.All interval techniques only work well if they stay the same Degree of wetting of the pane. However, due to the dynamics of traffic persists constantly the risk of unexpected splashing of the windshield and in extreme cases exactly when the driver does not have a free hand (switching process), which may be could even lead to disaster.

Der Erfindung liegt die Aufgabe zugrunde, den Fahrzeugführer von der Betätigung der Scheibenwischeranlage vollständig zu entlasten.The invention is based on the object of the vehicle driver To completely relieve the operation of the windshield wiper system.

Die Lösung dieser Aufgabe ist in den Patentansprüchen gekennzeichnet.The solution to this problem is characterized in the claims.

Zum besseren Verständnis folgt die Beschreibung von zwei Ausführungsbeispielen: Das erste Ausführungsbeispiel der Erfindung ist in der Zeichnung Fig. 1 dargestellt und zeigt einen optischen Sensor zur Messung von optischen Oberflächenveränderungen auf Glasscheiben durch Benetzung mit Flüssig keiten, bestehend aus einem rechtwinkeligen optischen Prisma 1, einer auf der einen Kathetenfläche angeordneten Lichtquelle 2 und mit einem lichtelektrischen Wandler 3 auf der anderen Kathetenfläche.For a better understanding, the description of two exemplary embodiments follows: The first embodiment of the invention is shown in the drawing FIG and shows an optical sensor for measuring optical surface changes on glass panes by wetting with liquids, consisting of a right-angled optical prism 1, a light source arranged on one cathetus surface 2 and with a photoelectric converter 3 on the other cathetus surface.

Durch geeignete optische Hilfsmittel, wie Parabolspiegel 4, Blende 6 und Linsen 5 ist dafür zu sorgen, daß der Strahlengang über der gesamten Kathetenfläche gleichmäßig verteilt und senkrecht zu den Flächen verläuft.Using suitable optical aids, such as parabolic mirrors 4, diaphragms 6 and 5 lenses ensure that the beam path over the entire cathetus surface evenly distributed and perpendicular to the surfaces.

Diese Anordnung ist mit Hilfe eines optischen Kitts 11 auf der Innenseite 9 der von den Scheibenwischern überstrichenen Scheibe 8 anzukleben. Nach dem optischen Gesetz der Totalreflexion in einem Prisma wird nun der Strahlengang aus der Lichtquelle an der ungestörten Außenfläche 7 voll reflektiert und dem lichtelektrischen Wandler 3 zugeführt.This arrangement is with the help of an optical cement 11 on the inside 9 to glue the window 8 swept over by the windshield wipers. According to the optical Law of total internal reflection in a prism now becomes the beam path fully reflected from the light source on the undisturbed outer surface 7 and the photoelectric Converter 3 supplied.

Eine Störung durch einen Wassertropfen 12 verursacht sodann eine teilweise Ablenkung des Lichtstrahles an die äußere Umgebung, wodurch eine Lichtreduzierung und damit änderung der elektrischen Werte am Wandler 3 entsteht.A disturbance by a water drop 12 then causes a partial Deflection of the light beam to the outside environment, thereby reducing the light and thus a change in the electrical values at the converter 3 occurs.

Fig. 2 zeigt das Prinzip nach Fig. 1, jedoch besteht der Unterschied in der Verwendung von 2 Prismen 13, Ilc, wobei auf dem einen nur die Lichtquelle 15-und dem-anderen-nur der lichtelektrische Wandler 16 angeordnet sind. Die so geteilte Anordnung muß räumlich voneinander getrennt so an der zu vermessenden Scheibe 17 angebracht werden, daß sich der Strahlengang durch Mehrfachreflektion 18 an der Außen- und Innenfläche der Scheibe trifft.Fig. 2 shows the principle of Fig. 1, but there is a difference in the use of 2 prisms 13, Ilc, with only the light source on one 15-and the-other-only the photoelectric converter 16 are arranged. The so divided The arrangement must be spatially separated from one another so on the pane 17 to be measured be attached that the beam path by multiple reflection 18 at the The outer and inner surfaces of the disc meet.

Die Erfindung entbindet den Fahrzeugführer nach dem einmaligen Inbetriebsetzen der erfindungsgemäßen Einrichtung von jeder weiteren Betätigung des Scheibenwischers, wobei eine ständig ausreichend transparente Windschutzscheibe gesichert ist. Die Erfindung ist sehr einfach und preiswert durch Verwendung von optischen Elementen aus Kunststoff infolge geringer Präzisionsans#prüche herstellbar. Die Elektronik zur Auswertung der Sensormeßwerte ist ebenfalls mit wenigen einfachen Mitteln realisierbar.The invention relieves the driver of the vehicle after it has been put into operation once the device according to the invention of any further actuation of the windshield wiper, a windshield that is always sufficiently transparent is ensured. the Invention is very simple and inexpensive through the use of optical elements Can be manufactured from plastic due to low precision requirements. The Electronic for evaluating the measured sensor values can also be implemented with a few simple means.

Claims (3)

PatentansprücheClaims 1. Sensoranordnung zur Messung von optischen Oberflächenveränderungen auf Glasscheiben infolge von Benetzung mit Flüssigkeiten, dadurch gekennzeichnet, daß auf den Kathetenflächen eines rechtwinkeligen optischen Prismas (1) einerseits eine Lichtquelle (2) und andererseits ein Lichtelektrischer Wandler (3) so angeordnet sind, daß unter Zuhilfenahme weiterer optischer Elemente, wie Spiegel (4) und Linsen (5) mit Blende (6) ein über möglichst die ganzen Kathetenflächen senkrecht dazu verlaufender, paralleler Strahlengang entsteht, der von der Außenfläche (7) der zu vermessenden Scheibe (8), auf deren Innenseite (9) die Hypotenusenfläche (10) des Prismas mit Hilfe eines optischen Kitts (11) anzubringen ist, durch Totalreflektion voll umgelenkt und durch Flüssigkeitsbenetzung (12) der Außenfläche (7) teilweise nach außen abgelenkt wird.1. Sensor arrangement for measuring optical surface changes on glass panes as a result of wetting with liquids, characterized in that that on the cathetus surfaces of a right-angled optical prism (1) on the one hand a light source (2) and on the other hand a photoelectric converter (3) so arranged are that with the help of other optical elements, such as mirrors (4) and lenses (5) with diaphragm (6) over the entire cathetus surfaces as possible perpendicular to it running, parallel beam path arises from the outer surface (7) of the disk to be measured (8), on the inside (9) of which the hypotenuse surface (10) of the prism is to be attached with the help of an optical cement (11), by total reflection fully deflected and partially due to liquid wetting (12) of the outer surface (7) is distracted to the outside. 2. Sensoranordnung zur Messung von optischen Oberflächenveränderungen auf Glasscheiben infolge von Benetzung mit Flüssigkeiten, dadurch gekennzeichnet, daß auf einer Kathetenfläche eines rechtwinkeligen optischen Prismas (13) eine Lichtquelle (15) und auf einer Kathetenfläche eines zweiten gleichartigen Prismas (14) ein lichtelektrischer Wandler (16) so angeordnet sind, daß unter Zuhilfenahme entsprechender optischer Hilfselemente ein über möglichst die ganzen Kathetenflächen senkrecht dazu verlaufender Strahlengang entsteht und daß die beiden Prismenanordnungen räumlich voneinander getrennt so an der zu vermessenden Scheibe (17) angebracht werden, daß sich der Strahlengang durch Mehrfachreflektion (18) an der Außen- und Innenfläche der Scheibe trifft.2. Sensor arrangement for measuring optical surface changes on glass panes as a result of wetting with liquids, characterized in that that on a cathetus surface of a right-angled optical prism (13) a light source (15) and on a cathetus surface of a second similar prism (14) a photoelectric Converter (16) are arranged so that with the aid of appropriate optical Auxiliary elements one that runs perpendicular to it over the entire cathetus surfaces as far as possible Beam path arises and that the two prism arrangements spatially from one another be attached separately to the disc (17) to be measured that the Beam path due to multiple reflections (18) on the outer and inner surface the disc hits. 3. Anwendung von 1. oder 2. zur Steuerung der Scheibenwischeranlage in Kraftfahrzeugen über eine entsprechende Elektronik.3. Use of 1. or 2. to control the windshield wiper system in motor vehicles via appropriate electronics. LeerseiteBlank page
DE2420594A 1974-04-27 1974-04-27 Sensor system for detecting wetting of motor vehicle windscreen - uses light beam which is totally internally reflected when windscreen is dry Pending DE2420594A1 (en)

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Application Number Priority Date Filing Date Title
DE2420594A DE2420594A1 (en) 1974-04-27 1974-04-27 Sensor system for detecting wetting of motor vehicle windscreen - uses light beam which is totally internally reflected when windscreen is dry

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DE2420594A DE2420594A1 (en) 1974-04-27 1974-04-27 Sensor system for detecting wetting of motor vehicle windscreen - uses light beam which is totally internally reflected when windscreen is dry

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2424156A1 (en) * 1978-04-25 1979-11-23 Bayerische Motoren Werke Ag VEHICLE HEADLIGHT EQUIPPED WITH A CLOGGING DETECTOR
DE2833635A1 (en) * 1978-08-01 1980-02-14 Siemens Ag Meter to detect dirtying of optical boundaries - has LED which transmits radiation towards surface, and detects reflected radiation
EP0079645A1 (en) * 1981-11-13 1983-05-25 Paul Kovacs Device for monitoring ice formation
DE3247659A1 (en) * 1982-12-23 1984-06-28 Wolfgang Dr. 7000 Stuttgart Ruhrmann OPTICAL SENSOR
US4477186A (en) * 1981-01-14 1984-10-16 Bifok Ab Photometric cuvette
US4652745A (en) * 1985-12-06 1987-03-24 Ford Motor Company Optical moisture sensor for a window or windshield
US4676638A (en) * 1983-03-31 1987-06-30 Kabushiki Kaisha Tokai Rika Denki Seisakusho Light-transmissible foreign object sensor
US4794266A (en) * 1986-02-04 1988-12-27 Vaisala Oy Method and apparatus for light transmission measurement by sending light, measuring received light and computing transmittance
EP0312919A2 (en) * 1987-10-17 1989-04-26 Hoechst Aktiengesellschaft Device for determining of superficial humidity
US4894532A (en) * 1988-03-28 1990-01-16 Westinghouse Electric Corp. Optical fiber sensor with light absorbing moisture-sensitive coating
DE4006420A1 (en) * 1990-03-01 1991-09-05 Bosch Gmbh Robert Optical detector for foreign bodies or coatings on transparent plate - has transceiver intermediate foil with highly transparent regions only in light path input and output areas with adhesive to prevent peeling
DE4028883A1 (en) * 1990-09-12 1992-03-19 Rheinhuette Gmbh & Co Indicating unwanted operating state of machine, esp. leak - by detecting change in reflectivity of reference surface when moistened
DE4201737A1 (en) * 1992-01-23 1993-07-29 Kostal Leopold Gmbh & Co Kg SENSOR DEVICE
DE4340681A1 (en) * 1993-11-30 1995-06-01 Telefunken Microelectron Sensor system
US6404490B2 (en) * 1998-12-17 2002-06-11 Leopold Kostal Gmbh & Co. Kg Method for detecting and localizing diffuse reflecting coatings situated on a translucent pane

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2424156A1 (en) * 1978-04-25 1979-11-23 Bayerische Motoren Werke Ag VEHICLE HEADLIGHT EQUIPPED WITH A CLOGGING DETECTOR
DE2833635A1 (en) * 1978-08-01 1980-02-14 Siemens Ag Meter to detect dirtying of optical boundaries - has LED which transmits radiation towards surface, and detects reflected radiation
US4477186A (en) * 1981-01-14 1984-10-16 Bifok Ab Photometric cuvette
EP0079645A1 (en) * 1981-11-13 1983-05-25 Paul Kovacs Device for monitoring ice formation
DE3247659A1 (en) * 1982-12-23 1984-06-28 Wolfgang Dr. 7000 Stuttgart Ruhrmann OPTICAL SENSOR
US4676638A (en) * 1983-03-31 1987-06-30 Kabushiki Kaisha Tokai Rika Denki Seisakusho Light-transmissible foreign object sensor
US4652745A (en) * 1985-12-06 1987-03-24 Ford Motor Company Optical moisture sensor for a window or windshield
US4794266A (en) * 1986-02-04 1988-12-27 Vaisala Oy Method and apparatus for light transmission measurement by sending light, measuring received light and computing transmittance
EP0312919A2 (en) * 1987-10-17 1989-04-26 Hoechst Aktiengesellschaft Device for determining of superficial humidity
EP0312919A3 (en) * 1987-10-17 1989-12-13 Hoechst Aktiengesellschaft Device for determining of superficial humidity
US4894532A (en) * 1988-03-28 1990-01-16 Westinghouse Electric Corp. Optical fiber sensor with light absorbing moisture-sensitive coating
DE4006420A1 (en) * 1990-03-01 1991-09-05 Bosch Gmbh Robert Optical detector for foreign bodies or coatings on transparent plate - has transceiver intermediate foil with highly transparent regions only in light path input and output areas with adhesive to prevent peeling
DE4006420C5 (en) * 1990-03-01 2004-02-05 Robert Bosch Gmbh Device for optically detecting foreign bodies or a coating on the surface of an optically transparent pane
DE4028883A1 (en) * 1990-09-12 1992-03-19 Rheinhuette Gmbh & Co Indicating unwanted operating state of machine, esp. leak - by detecting change in reflectivity of reference surface when moistened
DE4201737A1 (en) * 1992-01-23 1993-07-29 Kostal Leopold Gmbh & Co Kg SENSOR DEVICE
US5278425A (en) * 1992-01-23 1994-01-11 Leopold Kostal Gmbh & Co. Kg Lens system for moisture sensor device
DE4340681A1 (en) * 1993-11-30 1995-06-01 Telefunken Microelectron Sensor system
US5572315A (en) * 1993-11-30 1996-11-05 Temic Telefunken Microelectronic Gmbh Optical sensor system
US6404490B2 (en) * 1998-12-17 2002-06-11 Leopold Kostal Gmbh & Co. Kg Method for detecting and localizing diffuse reflecting coatings situated on a translucent pane

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