EP1578648A1 - Detecteur de pluie, destine notamment a un vehicule automobile - Google Patents

Detecteur de pluie, destine notamment a un vehicule automobile

Info

Publication number
EP1578648A1
EP1578648A1 EP03797944A EP03797944A EP1578648A1 EP 1578648 A1 EP1578648 A1 EP 1578648A1 EP 03797944 A EP03797944 A EP 03797944A EP 03797944 A EP03797944 A EP 03797944A EP 1578648 A1 EP1578648 A1 EP 1578648A1
Authority
EP
European Patent Office
Prior art keywords
rain sensor
receiver
transmitter
sensor according
module unit
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Withdrawn
Application number
EP03797944A
Other languages
German (de)
English (en)
Inventor
Stefan Stampfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1578648A1 publication Critical patent/EP1578648A1/fr
Withdrawn legal-status Critical Current

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
    • B60S1/0874—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 characterized by the position of the sensor on the windshield
    • B60S1/0888—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 characterized by the position of the sensor on the windshield characterized by the attachment of the elements in a unit
    • 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
    • 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

Definitions

  • the invention relates to a rain sensor, in particular for a motor vehicle according to the type of the independent claim.
  • Rain sensors in numerous different embodiments are known. Such a sensor usually consists of an optical transmission / reception path. A light coupled into the vehicle window at an angle of approximately 45 degrees is reflected under total reflection at the dry outer interface and strikes an optical receiver that is oriented at a suitable angle. If there are drops of water or if there is a film of water on the outer surface of the pane, total reflection no longer occurs, but a considerable part of the light is emitted to the outside. This significantly weakens the reception signal. The degree of this weakening can be used as a measure of the wetting of the pane with water. The signal obtained can serve, for example, as an input signal for a switch-on control of a windshield wiper device. Generic rain sensors with optical transmission / reception sections are, for example, from the DE 100 41 776 AI and known from DE 100 60 964 AI.
  • the known rain sensors differ in terms of their attachment to the windshield and in terms of their structure.
  • One-piece and two-piece designs are known.
  • a one-piece rain sensor is usually pressed onto the pane via a fastening element to be additionally attached to the pane, which is also referred to as a pressure coupling.
  • a two-part rain sensor is usually used for the so-called adhesive coupling. Part of it is glued directly to the window. This part is usually referred to as a carrier plate in which a lens system is integrated.
  • the adhesive connection can be made using a so-called coupling pad, which is typically an approximately 1.5 to 2 mm thick and optically transparent pressure-sensitive adhesive film made of polyacrylate or the like. is. After the optical part has been glued, the electronic unit with the transmitter and the receiver is connected to the latter, for example by means of snap hooks or by means of a sliding mechanism.
  • a glass pane which influences the wave propagation between the transmitter and the receiver is arranged in the measuring section.
  • the influencing takes place in such a way that when a coating is formed on the disk, an output signal detected by the receiver nal changes.
  • the rain sensor also has structures for coupling and decoupling the electromagnetic waves, which have radiation-concentrating properties.
  • the rain sensor is constructed from at least two module units that can be connected to one another.
  • the electromagnetic waves are light waves. These can essentially have wavelength components in the visible range and in the non-visible range. Infrared light in particular is well suited for the present application.
  • the glass pane is preferably a windshield of a motor vehicle, in which the rain sensor is preferably used.
  • the coating on the windshield can in particular be wet precipitation, for example rain or fog.
  • a first module unit can be connected to a second module unit by means of a detachable latching or plug connection.
  • the second module unit preferably has a joining surface that can be connected to the windshield. This joint surface can be attached to the windshield using a transparent adhesive layer.
  • the carrier plate is at least partially transparent and can be glued to the windshield by means of a transparent adhesive film or the like.
  • a transparent reaction or hot melt adhesive can optionally also be used for the adhesive connection.
  • the first module unit essentially comprises an upper part with a housing cover and electronic components located therein. A circuit board as well as the optical transmitter and receiver are attached in the housing cover. The first module unit thus contains the actual sensor part and is to be mounted on the carrier part separately from it.
  • the carrier part or the carrier plate contains no lenses or other optical components that deflect the radiation path.
  • the carrier part thus has no complex lens geometry.
  • the beam path until it enters the carrier part or after it emerges from the carrier part can be configured by light-influencing components such as lenses, light guides and mirrors, which are connected to the sensor unit and thus closely to the light-emitting and light-detecting components on the circuit board of the sensor unit are. In this way, an increased luminous efficacy can be achieved due to low scattering losses within the sensor and a better separation of the emitted beam from the received beam within the sensor.
  • the carrier plate can have latching webs on a side facing away from the joining surface for releasable latching connection to the first module unit. Alternatively, the carrier plate can also be connected to the upper part by means of a sliding catch or the like.
  • the rain sensor according to the invention preferably also has an external light barrier, which can be applied as a dimensionally stable or non-dimensionally stable component to the structures for coupling and decoupling the electromagnetic waves and ensures an improvement in the signal quality by shielding external light components.
  • the structures for coupling and decoupling the electromagnetic waves preferably consist essentially of transparent plastic, in particular of injection molded plastic.
  • the structures can be produced particularly advantageously as an integrated structural component.
  • the extraneous light barrier can be applied to this in a simple manner, for example as a plastic layer which is permeable or transparent to the electromagnetic waves only in the regions of the measuring section. In the areas of the measuring section, this plastic layer can preferably be provided with openings, which can be produced in particular by punching out the intended locations.
  • an optically transparent coupling pad can be arranged between the optical components of the carrier plate and the transmitter or the receiver.
  • This coupling cushion is made of an elastomeric and transparent plastic and can Fill air-filled spaces inside the sensor.
  • This coupling cushion can consist, for example, of SEBS or silicone, which can either already be applied to the carrier part, for example by means of injection molding, is inserted during assembly or can already be applied to the lenses, for example by means of injection molding.
  • the elastomer cushion is preferably slightly compressed in the assembled state in order to ensure a flat mutual coupling in all occurring tolerance cases of the carrier part, the sensor unit and their connection.
  • the optical light-influencing components such as lenses and light guides are arranged in the immediate vicinity of light-emitting and light-detecting components and, if appropriate, can also enclose them laterally. This results in an increased luminous efficiency due to less scattering losses and a better separation of the emitted beam from the received beam within the sensor.
  • the rain sensor according to the invention has an optimized lens or light guide geometry so that these reach as close as possible to the carrier part.
  • FIG. 1 shows a schematic representation of an upper part of a rain sensor according to the invention
  • FIG. 2 shows a carrier plate of the rain sensor in a schematic illustration
  • FIG. 3 shows the rain sensor in the assembled state and a schematic illustration
  • FIG. 4 shows a schematic representation of an upper part of an alternative variant of the rain sensor according to the invention
  • Figure 5 shows a carrier plate of the alternative variant of the rain sensor in a schematic
  • Figure 6 shows the alternative variant of the rain sensor in the assembled state.
  • the rain sensor 2 comprises a first module unit 7, which essentially comprises the electronic and optical components (cf. FIG. 1).
  • the first module unit 7 consists of an upper part 4 with a housing cover 6.
  • the first module unit 7 thus contains the actual components of the rain sensor.
  • a second module unit 19 can be connected to the first module unit 7 (cf. FIG. 2).
  • the second module unit 19 essentially comprises a carrier plate 20 which can be attached to a windshield 34 by means of an adhesive connection and onto which the first module unit 7 can be attached by means of a releasable latching connection.
  • the assembled rain sensor 2 is illustrated in FIG. 3.
  • a printed circuit board 10 is fastened in the housing cover 6 of the upper part 4, on which a transmitter 12 and a receiver 14 are arranged.
  • the transmitter 12 can in particular be an LED.
  • the receiver 14 can in particular be a photodiode or the like. his.
  • the wavelength ranges of transmitter 12 and receiver 14 are expediently coordinated with one another in such a way that the transmitter 12 emits a relatively narrow wavelength range and the receiver 14 is essentially only sensitive to this wavelength range.
  • Transmitter 12 and receiver 14 are located at opposite ends of the printed circuit board 10, so that a beam path 36 with obliquely incident and obliquely incident light can be formed.
  • the angle of incidence and angle of emergence are the same and can be in a reasonable range of 42 to 65 degrees.
  • a lens 16 of this type is arranged in each beam path 36 of the transmitter 12 as well as of the receiver 14 and ensures beam bundling.
  • the circuit board 10 preferably has a circuit with the required transmission and evaluation electronics and is connected to the vehicle electrical system via a plug (not shown).
  • the housing cover 6 has a cylindrical or cuboid contour with the side parts 18 pulled down. These are used for connection to lateral latching webs 22 of the carrier plate 20, which forms the lower part or the second module unit 19 of the rain sensor 2.
  • the carrier plate 20 preferably has a round or rectangular shape that is adapted to the contour of the housing cover 6 and is applied to a windshield 34 with an underside.
  • connection to the windshield 34 is expediently made via an adhesive layer 32, with which a joining surface 31 on the underside of the carrier plate 20 can be connected to the windshield.
  • the rain sensor 2 is thus applied flush and firmly to the surface of the glass pane 34.
  • a transparent adhesive film, a reaction or hot melt adhesive or the like is used in particular as the adhesive layer 32. in question.
  • the connection to the housing cover 6 is made via latches 24 protruding laterally from the vertically upward latching webs 22, which snap into corresponding recesses (not shown) on the inner sides of the side parts 18 and in this way for a firm but detachable connection of the upper part if necessary 4 can provide with the lower part of the support plate.
  • the carrier plate 20 is also provided with a transparent structural component 26 for coupling the light beams in and out of the rain sensor 2 and into the glass pane 34.
  • a drop of water 40 is indicated, which ensures a change in the refraction conditions at the interface with the air. This changed light refraction results in a variable signal weakening of the light component detected by the receiver and is a measure of the wetting of the windshield 34 with wet precipitation.
  • the structural component 26 of the carrier plate 20 has a first external light barrier 28 which covers an inner region lying between a coupling-out point for light emitted by the transmitter 12 and a coupling-in point for light detected by the receiver 14 and which is impermeable to the light processed by the transmitter 12 and receiver 14 is.
  • the first extraneous light barrier 28 can ensure that as far as possible all ambient light components are filtered out in the light hitting the receiver 14 remain, whereby the reliability of the signals supplied by the rain sensor 2 can be increased.
  • a second external light barrier 30 is located on the underside of the carrier plate 20 in an area outside the coupling and decoupling point and thus in an area around the first external light barrier 28.
  • the second external light barrier 30 can be made of the same material as the first external light barrier 28 second extraneous light barrier, however, an aluminum sheet or the like is also particularly suitable. , which is provided with the necessary breakthroughs.
  • the first external light barrier 28 can be implemented, for example, with a lacquer layer or with a plastic layer, which are preferably applied to the structural component 26 by means of an IMD method (in-mold decoration method).
  • the lacquer or plastic layer is already introduced into the injection mold before it is filled with plastic under pressure.
  • the finished lacquer or plastic layer is then located on the finished plastic component.
  • the plastic layer can in particular have a two-layer structure with a first layer made of a plastic mask and a second layer made of an optically active plastic film.
  • the aluminum sheet of the second external light barrier 30 can optionally be glued to the carrier plate 20 or connected to it by means of the injection molding process.
  • the plastic mask can preferably have punched-out openings at the coupling and decoupling points of the beam path 36, as a result of which the light exit and light entry regions of the mask film are defined.
  • the color film can in particular have a filter effect for extraneous light with a different wavelength range. In this way, the signal quality of the rain sensor 2 can be further improved.
  • the first extraneous light barrier 28 can optionally be applied to the inside of the carrier plate 20 facing the transmitter 12 and receiver 14. However, it can also be attached to the underside facing the glass pane 34.
  • the second external light barrier 30 can also be optionally applied outside or inside.
  • FIGS. 4 to 6 show a variant of the rain sensor 2 according to the invention, in which coupling cushions 38 are provided in the beam path 36 on the structural component 26.
  • These transparent and flexible coupling cushions 38 can ensure that the beam path 36 inside the rain sensor 2 runs exclusively in transparent solid bodies and no longer in air.
  • the coupling cushions 38 which are preferably made of transparent and elastomeric plastic, can optionally also be introduced using an injection molding process and firmly connected to the structural component 26 of the carrier plate 20.
  • the lenses 16 mounted in the light guide carrier 8 are extended correspondingly far in the direction of the structural component 26 (cf. FIG. 4) and have in this variant ante a cylindrical extension that follows the beam path 36.
  • the coupling cushions 38 each fill the entire space between the lenses 16 and the structural component 26 (cf. FIG. 6). Only in this way can the entire beam path 36 be filled with the coupling cushion 38. As a result, interfaces to air are avoided in the transition from the sensor unit to the carrier part, and thus scattering and reflection losses are avoided or reduced.
  • a further alternative variant can provide that the interspaces between transmitter 12 and associated lens 16 and / or between receiver 14 and associated lens are each provided with coupling cushions (not shown). This variant excludes any possible further boundary layer transition of the beam path between air and transparent structures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un détecteur de pluie (2), destiné notamment à un véhicule automobile, comportant une section de mesure qui présente au moins un émetteur (12) et au moins un récepteur (14) pour des ondes électromagnétiques (ondes lumineuses). Dans cette section de mesure se trouve un pare-brise qui influe sur la propagation des ondes entre le ou les émetteurs (12) et le ou les récepteurs (14) de sorte qu'un signal de sortie détecté par le récepteur (14) est modifié lors de la formation d'un dépôt sur le pare-brise, notamment lors de la formation d'humidité sur ce dernier, provoquée par une précipitation. Ledit détecteur de pluie (2) présente en outre des structures servant à injecter et à extraire des ondes électromagnétiques, qui présentent des propriétés de concentration de rayonnements. Selon l'invention, ledit détecteur de pluie (2) est constitué d'au moins deux unités modulaires (7) et (19) pouvant être raccordées l'une à l'autre, une de ces unités modulaires (7, 19) présentant des composants optiques et électroniques.
EP03797944A 2002-12-20 2003-06-04 Detecteur de pluie, destine notamment a un vehicule automobile Withdrawn EP1578648A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10261244 2002-12-20
DE2002161244 DE10261244A1 (de) 2002-12-20 2002-12-20 Regensensor, insbesondere für ein Kraftfahrzeug
PCT/DE2003/001926 WO2004060730A1 (fr) 2002-12-20 2003-06-04 Detecteur de pluie, destine notamment a un vehicule automobile

Publications (1)

Publication Number Publication Date
EP1578648A1 true EP1578648A1 (fr) 2005-09-28

Family

ID=32404333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03797944A Withdrawn EP1578648A1 (fr) 2002-12-20 2003-06-04 Detecteur de pluie, destine notamment a un vehicule automobile

Country Status (3)

Country Link
EP (1) EP1578648A1 (fr)
DE (1) DE10261244A1 (fr)
WO (1) WO2004060730A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007039349A1 (de) 2007-08-01 2009-02-05 Robert Bosch Gmbh Vorrichtung zur Bestimmung der Reflexionseigenschaften einer Grenzfläche
DE102007037548A1 (de) 2007-08-09 2009-02-12 Robert Bosch Gmbh Optische Regensensorvorrichtung für ein Kraftfahrzeug
DE102007061725A1 (de) 2007-12-20 2009-06-25 Robert Bosch Gmbh Verfahren zur Plausibilitätsprüfung wenigstens eines Lichtdetektors einer Fahrlichtassistenzvorrichtung eines Kraftfahrzeugs
DE102007062258A1 (de) * 2007-12-21 2009-06-25 Robert Bosch Gmbh Optische Regensensorvorrichtung für ein Kraftfahrzeug
DE102008000599A1 (de) 2008-03-11 2009-09-17 Robert Bosch Gmbh Vorrichtung zur Bestimmung der Reflexionseigenschaften einer Grenzfläche mit verbesserter Fremdlichtunterdrückung
DE102009026872A1 (de) * 2009-06-10 2010-12-16 Robert Bosch Gmbh Sensoreinrichtung mit Optikeinheit
PL2802488T3 (pl) 2012-01-11 2017-01-31 Saint-Gobain Glass France Sterowanie wycieraczką
JP2015052496A (ja) 2013-09-06 2015-03-19 株式会社リコー 導光体、物体検出装置
US11953343B2 (en) * 2017-07-07 2024-04-09 Marcy Enterprises, Inc. Packaged sensor pad

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4027367C1 (en) * 1990-08-30 1991-07-04 Robert Bosch Gmbh, 7000 Stuttgart, De Deposit detector for outer surface of pane - uses radiation source and receiver at right angles to pane esp. windscreen to detect rain drops
JPH09257952A (ja) * 1996-03-27 1997-10-03 Yazaki Corp 結露および雨滴検出センサとその検出方法
US5661303A (en) * 1996-05-24 1997-08-26 Libbey-Owens-Ford Co. Compact moisture sensor with collimator lenses and prismatic coupler
JPH10318912A (ja) * 1997-05-20 1998-12-04 Yazaki Corp 液滴検知装置
US5898183A (en) * 1997-10-16 1999-04-27 Libbey-Owens-Ford Co. Compact moisture sensor with efficient high obliquity optics

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004060730A1 *

Also Published As

Publication number Publication date
WO2004060730A1 (fr) 2004-07-22
DE10261244A1 (de) 2004-07-01

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