EP1687618A1 - Feuchtigkeitssensor - Google Patents
FeuchtigkeitssensorInfo
- Publication number
- EP1687618A1 EP1687618A1 EP04787029A EP04787029A EP1687618A1 EP 1687618 A1 EP1687618 A1 EP 1687618A1 EP 04787029 A EP04787029 A EP 04787029A EP 04787029 A EP04787029 A EP 04787029A EP 1687618 A1 EP1687618 A1 EP 1687618A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- moisture sensor
- moisture
- windshield
- capacitors
- electrodes
- 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- Withdrawn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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
- B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10165—Functional features of the laminated safety glass or glazing
- B32B17/10174—Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
-
- 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
- B60S1/0825—Capacitive rain sensor
Definitions
- the invention relates to a moisture sensor for a motor vehicle, with at least two separately controllable capacitors whose capacities can be changed by the action of moisture.
- Such moisture sensors are used to automatically, e.g. can be controlled without manual operation by an operator.
- Moisture sensors react to a change in the moisture of the environment in which the moisture sensor is arranged.
- a first development line includes moisture sensors that are based on an opto-electronic principle, the radiation intensity being able to be influenced by moisture. From the change in radiation intensity, conclusions can be drawn as to how wet the sensor area is, for example by exposure to raindrops.
- a second line of development pursues the improvement of more capacitive rain sensors. These sensors are based on the fact that the capacitance of a capacitor changes due to a change in the dielectric. It was initially proposed (for example according to EP 01 92 416 A2) to apply electrodes spaced apart from one another on the outer skin of a windshield. These electrodes form a capacitor, the capacitance of this capacitor being changeable by the action of moisture. In order to increase the capacitance of the capacitor, it is proposed to enlarge the surface of the electrodes by means of a large number of projections. The arrangement of the electrodes in the area of the outer skin of the windshield has proven to be problematic emphasized, since the electrodes are exposed to weather conditions and are also exposed to mechanical stress from windshield wipers brushing over the electrodes.
- the present invention has for its object to provide a moisture sensor with which reliable operation is guaranteed even with a changing degree of contamination of a windshield.
- This object is achieved according to the invention in that an evaluation unit is provided for comparing the capacities with one another.
- a capacity is not compared with a predetermined size. Rather, different capacities are measured and compared with each other. Conclusions about the moisture in the vicinity of the moisture sensor can then be drawn from this comparison. For example, raindrops hitting the moisture sensor lead to an inequality of the measured capacities, so that the evaluation unit can determine a difference value. Differential values can be output as pulses, the duration of the pulse being a measure of the size of the raindrops and the number of pulses being a measure of the intensity of the rain. Due to the comparison of the two capacitances, parasitic effects are not taken into account.
- the area around the moisture sensor is surrounded by a layer of dust, this does not play a role when considering the capacities, since only the differential values of the capacities are included in the control of the windscreen wiper system Need to become. Malfunctions such as dirt, disc inhomogeneity or streaks can thus be corrected.
- the aging of the windshield also plays no role in the reliable operation of the moisture sensor according to the invention.
- a capacitor advantageously has a transmitting electrode and a receiving electrode spaced apart from it.
- These electrodes' can, as known from the prior art, to the outer skin of the windshield, but preferably in an inner layer of a windshield and thus protected from mechanical influences, can be arranged.
- An advantageous embodiment of the invention provides that at least two capacitors have a common transmitting electrode or a common receiving electrode. With such an arrangement, the number of electrodes required can be reduced, the capacities being able to be built up alternately between two transmitting electrodes and a common receiving electrode or between two receiving electrodes and a common transmitting electrode.
- a common receiving electrode is advantageously arranged in particular centrally between two transmitting electrodes. It is also possible to arrange a common transmitting electrode, in particular in the middle, between two receiving electrodes. This makes it possible to form two capacitors with a few electrodes in a relatively small space.
- the installation space can be kept to a minimum within one level by arranging the capacitors or the electrodes of the capacitors.
- the electrodes of the capacitors can be designed essentially in a straight line. They can be strip-shaped and, for example, 10 mm wide and 100 mm long. The distance, ie the free space remaining between the electrodes, can be 4 mm wide, for example. However, the electrodes can also have a multiplicity of projections in order to enlarge the surface of the electrodes.
- the electrodes of a capacitor advantageously delimit at least an area of 1500 mm 2 , in particular from 2000 to 2500 mm 2 .
- the moisture sensor advantageously comprises further components, for example an electrical supply unit for the capacitors and a control unit for the windshield wiper system of the motor vehicle, it being possible for the control unit to be fed by the evaluation unit.
- the evaluation unit is advantageously suitable for detecting the various capacities per se and / or their temporal course and / or quantities derived therefrom. A large number of electrical variables can thus be used to operate a windshield wiper system.
- the invention also relates to a windshield for a motor vehicle with a moisture sensor and a motor vehicle with a windshield with a moisture sensor.
- the invention further relates to a method for operating a moisture sensor, which is characterized in that a first capacitance which can be modified by the action of moisture is built up on a first capacitor, that a second capacitance which can be modified by the action of moisture is built up on a second condenser and that a difference value is formed from the first and second capacitance.
- the capacities can be built up simultaneously or alternately.
- the difference value is advantageously used as an input variable for controlling the windshield wiper system of a motor vehicle.
- a moisture sensor according to the invention is generally designated by reference number 2.
- the moisture sensor 2 is arranged in a windshield 4 of a motor vehicle (not shown further).
- the windshield 4 has an outer layer 6 and an inner layer 8 made of glass.
- a heat-insulating intermediate layer 10 made of a PVB film is provided between layers 6 and 8.
- This PVB film can be provided with an infrared-reflecting layer, which is applied to the intermediate layer 10, for example by vapor deposition.
- a first, elongated transmission electrode 12 is provided between the outer layer 6 and the intermediate layer 10. Comparable to the production of an infrared light reflecting layer, this can be produced by vapor deposition on the intermediate layer 10 or the outer layer 6. Adjacent to the transmitting electrode 12 is a receiving electrode 14 provided, which is also elongated. The first transmission electrode 12 and the reception electrode 14 form a capacitor 16. A second transmission electrode 18 is provided on the side of the reception electrode 14 opposite the transmission electrode 12. The second transmitting electrode 18 and the receiving electrode 14 form a second capacitor 20.
- Electrodes 12, 14 and 18 are arranged parallel to one another, the receiving electrode being arranged centrally between the transmitting electrodes 12 and 18.
- the electrodes 12 and 14 and 14 and 18 each delimit an area of at least 2000 mm 2 , the transmitting electrodes 12 and 18 an area of at least 4000 mm 2 .
- the electrodes 12, 14 and 18 are coupled to a transmitting / receiving unit 30 via electrical lines 24, 26 and 28.
- This unit 30 has a first transmitter 32 for the transmission electrode 12, a receiver 34 for the reception electrode 14 and a second transmitter 36 for the transmission electrode 18.
- the transmitters 32 and 36 and the receiver 34 are in turn connected to an evaluation unit 44 via electrical lines 38, 40 and 42.
- the evaluation unit 44 is supplied with electrical energy by a supply unit 46 via a supply line 48.
- the evaluation unit 44 is connected via a line 50 to a control unit 52 for a windshield wiper system 56.
- the control unit 52 is in turn coupled to the motor of a windshield wiper system 56 via a control line 54.
- the moisture sensor shown can be used regardless of contamination of the outer skin of the outer layer 6 of the windshield 4, since the capacitors 16 and 20 do not have to be compared with previously defined reference values, but rather can be compared with one another.
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003156407 DE10356407A1 (de) | 2003-11-26 | 2003-11-26 | Feuchtigkeitssensor |
PCT/EP2004/010825 WO2005059533A1 (de) | 2003-11-26 | 2004-09-28 | Feuchtigkeitssensor |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1687618A1 true EP1687618A1 (de) | 2006-08-09 |
Family
ID=34625512
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04787029A Withdrawn EP1687618A1 (de) | 2003-11-26 | 2004-09-28 | Feuchtigkeitssensor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1687618A1 (de) |
DE (1) | DE10356407A1 (de) |
WO (1) | WO2005059533A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1830182A1 (de) * | 2006-02-22 | 2007-09-05 | Glaverbel | Verbundverglasung |
DE102011081139A1 (de) * | 2011-08-17 | 2013-02-21 | TAKATA Aktiengesellschaft | Sensorsystem für ein Kraftfahrzeug |
EP3847060A1 (de) * | 2018-09-03 | 2021-07-14 | Saint-Gobain Glass France | Verglasungseinheit |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0192416A3 (de) * | 1985-02-15 | 1988-10-05 | Toyota Jidosha Kabushiki Kaisha | Aufnehmer zum Aufnehmen einer Menge Regen |
US4705998A (en) * | 1987-02-09 | 1987-11-10 | Steven Alpert | Automatic window wiper control |
US4831493A (en) * | 1987-12-28 | 1989-05-16 | Ppg Industries, Inc. | Windshield moisture sensor |
US4827198A (en) * | 1988-02-09 | 1989-05-02 | General Motors Corporation | Vehicle windshield and wiper with rain sensor |
DE3937605C2 (de) * | 1989-11-11 | 1998-09-03 | Mannesmann Vdo Ag | Feuchtigkeitssensor |
US5801307A (en) * | 1995-07-12 | 1998-09-01 | Netzer; Yishay | Differential windshield capacitive moisture sensors |
US5682788A (en) * | 1995-07-12 | 1997-11-04 | Netzer; Yishay | Differential windshield capacitive moisture sensor |
US6094981A (en) * | 1998-09-25 | 2000-08-01 | Itt Automotive Electrical Systems, Inc. | Capacitive rain sensor for windshield |
US6373263B1 (en) * | 2000-04-20 | 2002-04-16 | Millennium Sensors Ltd. | Differential windshield capacitive rain sensor |
-
2003
- 2003-11-26 DE DE2003156407 patent/DE10356407A1/de not_active Withdrawn
-
2004
- 2004-09-28 WO PCT/EP2004/010825 patent/WO2005059533A1/de not_active Application Discontinuation
- 2004-09-28 EP EP04787029A patent/EP1687618A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2005059533A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005059533A1 (de) | 2005-06-30 |
DE10356407A1 (de) | 2005-06-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20060520 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHULER, THOMAS Inventor name: NIES, JUERGEN Inventor name: BRIEM, ROLF |
|
DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20080731 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20081211 |