GB2208433A - Detecting water droplets on a vehicle window and controlling windscreen wiper in response thereto - Google Patents

Detecting water droplets on a vehicle window and controlling windscreen wiper in response thereto Download PDF

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Publication number
GB2208433A
GB2208433A GB8818111A GB8818111A GB2208433A GB 2208433 A GB2208433 A GB 2208433A GB 8818111 A GB8818111 A GB 8818111A GB 8818111 A GB8818111 A GB 8818111A GB 2208433 A GB2208433 A GB 2208433A
Authority
GB
United Kingdom
Prior art keywords
window
edge
photodetector
fact
windscreen wiper
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Withdrawn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
GB8818111A
Other versions
GB8818111D0 (en
Inventor
Sergio Stibelli
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.)
Veglia Borletti SRL
Original Assignee
Veglia Borletti SRL
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 Veglia Borletti SRL filed Critical Veglia Borletti SRL
Publication of GB8818111D0 publication Critical patent/GB8818111D0/en
Publication of GB2208433A publication Critical patent/GB2208433A/en
Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
    • B60S1/0833—Optical rain sensor
    • B60S1/0837—Optical rain sensor with a particular arrangement of the optical elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—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
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/94—Investigating contamination, e.g. dust
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/94—Investigating contamination, e.g. dust
    • G01N2021/945—Liquid or solid deposits of macroscopic size on surfaces, e.g. drops, films, or clustered contaminants
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • G01N2021/9586—Windscreens

Landscapes

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

Description

---1.. 1 A 0 k 1 1 2 2 0 8 4 -3) 3 A SENSOR DEVICE FOR DETECTING THE
PRESENCE OF WATER DROPLETS ON A VEHICLE WINDOW AND WINDSCREEN WIPER CONTROL APPARATUS PROVIDED WITH SAID DEVICE The present invention relates to a sensor device for detecting the presence of water droplets on a window. The present invention further relates to windscreen wiper control apparatus provided with said device.
An object of the present invention is that of providing a sensor device for detecting the presence of water droplets on a vehicle window which can be simple to produce and assemble and of low production cost.
is A further object of the present invention is that of providing windscreen wiper control apparatus provided with the said device,'which can be simple to produce and of low production cost.
According to the present invention there is provided a sensor device for detecting the presence of water droplets on a vehicle window, characterised by the fact that it comprises:
a light source adapted to be installed close to the lower edge of the said window, which emits light rays which enter, through the said lower edge, into the said 2 window; and a photodetector adapted to be installed close to the upper edge of the said window, the said photodetector emitting an electrical signal dependent on the intensity of the light rays which reach it after having traversed the said window.
According to the present invention there is further provided apparatus characterised by the fact that it comprises: at least one sensor device for detecting the presence of water droplets on a window, of the type comprising a light source installed close to the lower edge of the said window and operable to emit light rays which enter through the said lower edge into the said window, which guides the said light rays and conveys them towards a photodetector installed close to the upper edge of the said window, and which is operable to emit an electrical signal corresponding to the intensity of light which strikes it; electrical processing means for processing the said electrical signal generated by the said photodetector; and electrical control means for actuating the said windscreen wiper.
For a better understanding of the present invention a -t 1 3 preferred embodiment is now described by way of non-limitative example and with reference to the attached drawings, in which:
Figures 1 and 2 illustrate the operation of a sensor device formed according to the principles of the present invention in two different working conditions; and Figure 3 is an electrical block diagram of windscreen wiper control apparatus provided with the 10 device of Figure 1.
is As illustrated in Figures 1 and 2, the reference numeral 1 indicates a sensor device -for detecting the presence of water droplets 2 on a window 3 of a vehicle. The device 1 can be applied to the windscreen and/or the rear window of the vehicle.
The device 1 comprises a light source 4 mounted facing the lower edge of the window 3 in such a way that the light rays emitted thereby enter into the window 3 through this lower edge, and a photodetector 5 installed along the upper edge of the window 3 and able to receive the light rays emitted by the source 4 and reflected along the window.
With reference to Figure 1, according to the known laws 4 of optics, if the light rays are emitted with a low angle of incidence to the face of the window 3 they propagate along it, whilst if emitted with a high angle of incidence they are attenuated in that each ray is in part refracted towards the outside and in part reflected along the window 3. However such reflection takes place always with a high angle of incidence so that gradually as it propagates upwards each light ray is even more attenuated. For this reason the intensity of light conveyed towards the photodetector 5 is represented almost exclusively by the light rays emitted with a low angle of incidence.
With reference to Figure 3, in-the case in which the is outer face of the windscreen 3 has water droplets 2 present, these operate as spherical dioptric surfaces so that even the light rays emitted with a low angle of incidence are attenuated in that each of these, when incident on a zone in which a waterdroplet is present, is partly refracted outwardly and partly reflected along the windscreen 3. Consequently, if there are water droplets 2 present on the window 3 the intensity of light which the window 3 conveys towards the photodetector 5 is less than that conveyed when there are no water droplets 2 on the window 3.
tf 4 1 1 As illustrated in Figure 3, the reference numeral 6 generally indicates electrical apparatus which, on the basis of the light intensity conveyed to the photodetector 5, is operable to control actuation of a windscreen wiper, not illustrated for simplicity, but operable to wipe the window 3.
The apparatus 6 includes the sensor device 1 which, in this embodiment, has a light source 4 constituted by a light emitting diode (LED) 7 and a photodetector 5 constituted by a phototransistor 8. The apparatus 6 further includes an electric current source 11 operable to supply the diode 7 and a processing and control circuit which has, in succession from the phototransistor is 8, a capacitor 12, a signal amplifier block 13, a detector block 14, a comparator block 15, a power amplifier block 16, and a block 17 for controlling an electric motor 18 operable to drive the windscreen wiper. Therefore, the value of the light intensity conveyed to the phototransistor 8 has a corresponding proportional electrical signal which is amplified by the block 13. The block 14 detects the presence of this signal and transmits it to the block 15 which effects a comparison of the amplitude of the signal itself with a predetermined reference signal.
6 If the signal coming from the block 14 is less than the reference value (which signifies that there are droplets of water 2 on the window 3) the apparatus 6, via the blocks 16 and 17, controls the electrical supply of the motor 18 which in turn puts the windscreen wiper in motion, for example for a single wipe across the window 3.
Naturally it is possible to modify the apparatus 6 in such a way that it controls the actuation of the windscreen wiper for example for two or more wipes upon each detection of water droplets.
From what has been explained above the advantages achieved with the embodiment of the present invention are apparent.
In particular, the apparatus 6 detects the possible presence of water droplets on the window, without any action by the driver, and automatically provides for the removal of these. The driver therefore does not have to do anything and can therefore concentrate solely on driving the vehicle. This advantage is more apparent in particular conditions such as, for example, in the case of intermittent rain and in the case of a wet road in which water spray thrown up from other vehicles strikes 5, t V 7 the windscreen, and in which the driver, in the absence of the apparatus 6, must operate the windscreen wiper often but with irregular frequency. Further, the constructional simplicity of the device 1 and the apparatus 6, which allows their production at low cost is emphasised.
Finally, it is clear that the device 1 and the apparatus 6 described and illustrated here can have modifications and variations introduced thereto without by this departing from the protective ambit of the present invention.
In particular, the apparatus 6 could include a plurality of devices 1 connected in parallel and disposed along a window 3 at a predetermined distance. This arrangement allows the actuation of the windscreen wiper to be controlled even when the water droplets are deposited, for example in the case of the condition of Figure 2 first described, only on a zone of the window 3 of limited extent but which could be important for correct visibility (thinking, for example, of the wide windows of industrial vehicles or of goods or passenger transports).

Claims (9)

1. A sensor device for detecting the presence of water droplets on a window of a vehicle, characterized by the fact that it comprises:
a light source adapted to be installed close to a first edge of the said window, which emits light rays which enter through the said first edge into the said window; and a photodetector which can be installed close to a second edge of the said window opposite the said first edge, the said photodetector emitting an electrical signal dependent on the intensity of the light rays which reach it after having traversed the said window.
J_
2. A sensor device according to Claim 1, characterized by the fact that the said light source comprises a light emitting diode
3. A sensor device according to Claim 1 or Claim 2, characterized by the- fact that the said photodetector comprises a phototransistor
4. Windscreen wiper control apparatus characterized by the fact that it comprises:
at least one sensor device for detecting the presence of water droplets on a window and of the M v - 9 type comprising a light source installed close to one edge of the said window and operable to emit light rays through the said one edge, into the said window which guides these rays and conveys them towards a photodetector installed close to an edge of the said window opposite the said one edge,which acts to emit an eletrical signal corresponding to the intensity of light which strikes it; electrical processing means for processing he said electrical signal generated by the said photodetector; and electrical control means' for controlling the actuation of the said windscreen wiper.
5. Apparatus according to Claim 4, characterized by the fact that the said processing means include a comparator block operable to compare the value of the said elec trical signal with a predetermined reference value.
6. Apparatus according to Claim 5, characterized by the fact that the said processing means comprise, downstream from the said photodetector a signal amplifier bloci, a signal detection block, the said comparator block. and a power amplification block i 1
7. Apparatus according to -. Claims 5 and 6, characterised by the fact that the said control means comprise a block for controlling an electric motor operable to actuate the said windscreen wiper.
8. A sensor device for detecting the presence of water droplets on a window of a vehicle according to one of Claims 1 to 3, essentially as described and illustrated with reference figures- 1, 2 aLnd-3"of the drawings.
9. Windscreen wiper control apparatus according to one of Claims from 4 to 7, essentially as described and illustrated with reference to figure 3 of thedrawings.
Published 1988 at The Patent office. State House. 6671 High Helborn. London WClR 4TP, Further copies may be obtained from 7ne Patent Office. Sales Branch, St Mar7 Crky. Orpington, Kent BE-5 3RD Printed by Multiplex tec=ques ltd. St Mary Cray. Ken, Coi- 187
GB8818111A 1987-07-31 1988-07-29 Detecting water droplets on a vehicle window and controlling windscreen wiper in response thereto Withdrawn GB2208433A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT8753568U IT212332Z2 (en) 1987-07-31 1987-07-31 DEVICE SENSOR OF THE PRESENCE OF WATER DROPS ON A VEHICLE CRYSTAL AND EQUIPMENT OF A WINDSCREEN WIPER EQUIPPED WITH THE SAID DEVICE

Publications (2)

Publication Number Publication Date
GB8818111D0 GB8818111D0 (en) 1988-09-01
GB2208433A true GB2208433A (en) 1989-03-30

Family

ID=11283753

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8818111A Withdrawn GB2208433A (en) 1987-07-31 1988-07-29 Detecting water droplets on a vehicle window and controlling windscreen wiper in response thereto

Country Status (6)

Country Link
BE (1) BE1000828A7 (en)
DE (1) DE3825665A1 (en)
ES (1) ES1009119Y (en)
FR (1) FR2619618B3 (en)
GB (1) GB2208433A (en)
IT (1) IT212332Z2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2229269A (en) * 1989-02-16 1990-09-19 Atomic Energy Authority Uk Surface moisture detection
FR2672124A1 (en) * 1991-01-25 1992-07-31 Thomson Csf METHOD AND DEVICE FOR CONTROLLING THE SURFACE CONDITION OF AN OPTICAL LIGHT TRANSMISSION ELEMENT
GB2309780A (en) * 1996-02-01 1997-08-06 Bosch Gmbh Robert A device for operating a windscreen wiper
EP0999104A3 (en) * 1998-11-02 2003-09-17 Central Glass Company, Limited Water droplet sensor and exposure system for hologram
EP3623797A1 (en) * 2018-09-11 2020-03-18 Rockwell Automation Technologies, Inc. Droplet sensor

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3902231A1 (en) * 1989-01-26 1990-08-09 Voralp Ets Device for controlling a windscreen wiper
DE4036407C2 (en) * 1990-11-15 1994-06-01 Telefunken Microelectron Sensor system
EP0706648B1 (en) * 1993-07-02 1997-09-03 Gerd Reime Arrangement for measuring or detecting a change in a retro-reflective component
DE4339574C2 (en) * 1993-11-19 1999-07-15 Gerd Reime Evaluation device for signals, which were determined by a measuring arrangement for measuring or recognizing the wetting of a surface
ES2102230T5 (en) * 1993-07-02 2003-05-01 Gerd Reime DEVICE FOR CONTROLLING A WINDSHIELD CLEANING SYSTEM.
DE9309837U1 (en) * 1993-07-02 1993-09-02 Reime, Gerd, 75328 Schömberg Arrangement for measuring or detecting the wetting of a wall or plate which is permeable to a specific radiation
EP0911231B1 (en) * 1997-10-18 2003-07-09 Volkswagen Aktiengesellschaft Rain sensor
DE19818643A1 (en) * 1998-04-25 1999-10-28 Reitter & Schefenacker Gmbh Lights, in particular rear lights, for motor vehicles
DE10352235A1 (en) * 2003-11-08 2005-06-09 Robert Bosch Gmbh Rain sensor for glass panes, in particular for windscreens of motor vehicles
DE10358199B3 (en) * 2003-12-12 2005-05-25 Leoni Ag Device for detecting fouling on object surfaces in Xenon headlamps for motor vehicles has optical element directly integrated into object surface without cover, at least one coupling point for coupling light in and/or out of optical element
DE102004054465A1 (en) * 2004-11-11 2006-05-24 Robert Bosch Gmbh Optical sensor for detecting moisture on a window of a motor vehicle
FR3122495A1 (en) * 2021-04-30 2022-11-04 Saint-Gobain Glass France GLASS ASSEMBLY INCLUDING A MIST DETECTOR

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1242621A (en) * 1968-03-27 1971-08-11 Eltro Gmbh Improvements in or relating to the detection of dirt or condensation on windows
GB1484613A (en) * 1973-10-29 1977-09-01 Karl G Windscreen soiling sensor
US4589771A (en) * 1983-06-28 1986-05-20 Nippondenso Co., Ltd. Electro-optical liquid detector assembly
US4652745A (en) * 1985-12-06 1987-03-24 Ford Motor Company Optical moisture sensor for a window or windshield
US4701613A (en) * 1984-11-09 1987-10-20 Nippondenso Co., Ltd. Electro-optical rain detector for windshields

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1242621A (en) * 1968-03-27 1971-08-11 Eltro Gmbh Improvements in or relating to the detection of dirt or condensation on windows
GB1484613A (en) * 1973-10-29 1977-09-01 Karl G Windscreen soiling sensor
US4589771A (en) * 1983-06-28 1986-05-20 Nippondenso Co., Ltd. Electro-optical liquid detector assembly
US4701613A (en) * 1984-11-09 1987-10-20 Nippondenso Co., Ltd. Electro-optical rain detector for windshields
US4652745A (en) * 1985-12-06 1987-03-24 Ford Motor Company Optical moisture sensor for a window or windshield

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2229269A (en) * 1989-02-16 1990-09-19 Atomic Energy Authority Uk Surface moisture detection
GB2229269B (en) * 1989-02-16 1993-04-21 Atomic Energy Authority Uk Surface moisture detection
FR2672124A1 (en) * 1991-01-25 1992-07-31 Thomson Csf METHOD AND DEVICE FOR CONTROLLING THE SURFACE CONDITION OF AN OPTICAL LIGHT TRANSMISSION ELEMENT
EP0497649A1 (en) * 1991-01-25 1992-08-05 Thomson-Csf Method and device for testing the surface condition of a light transmitting optical element
GB2309780A (en) * 1996-02-01 1997-08-06 Bosch Gmbh Robert A device for operating a windscreen wiper
GB2309780B (en) * 1996-02-01 1998-03-25 Bosch Gmbh Robert A device for operating a windscreen wiper
US5847654A (en) * 1996-02-01 1998-12-08 Robert Bosch Gmbh Device for operating a windshield wiper
EP0999104A3 (en) * 1998-11-02 2003-09-17 Central Glass Company, Limited Water droplet sensor and exposure system for hologram
EP3623797A1 (en) * 2018-09-11 2020-03-18 Rockwell Automation Technologies, Inc. Droplet sensor
US10654450B2 (en) 2018-09-11 2020-05-19 Rockwell Automation Technologies, Inc. Droplet sensor

Also Published As

Publication number Publication date
IT8753568V0 (en) 1987-07-31
DE3825665A1 (en) 1989-02-09
IT212332Z2 (en) 1989-07-04
BE1000828A7 (en) 1989-04-11
ES1009119U (en) 1989-07-16
GB8818111D0 (en) 1988-09-01
ES1009119Y (en) 1990-01-01
FR2619618B3 (en) 1989-10-20
FR2619618A1 (en) 1989-02-24

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