WO1995010434A1 - Einrichtung für die automatische steuerung eines scheibenwischermotors - Google Patents
Einrichtung für die automatische steuerung eines scheibenwischermotorsInfo
- Publication number
- WO1995010434A1 WO1995010434A1 PCT/DE1994/001134 DE9401134W WO9510434A1 WO 1995010434 A1 WO1995010434 A1 WO 1995010434A1 DE 9401134 W DE9401134 W DE 9401134W WO 9510434 A1 WO9510434 A1 WO 9510434A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- threshold
- curve
- function curve
- moisture
- Prior art date
Links
- 230000008859 change Effects 0.000 claims abstract description 20
- 238000011156 evaluation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000006870 function Effects 0.000 description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 241000238631 Hexapoda Species 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 241000254173 Coleoptera Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S318/00—Electricity: motive power systems
- Y10S318/02—Windshield wiper controls
Definitions
- the invention relates to a device according to the preamble of patent claim 1.
- windshield wiper controls have also been proposed which have a sensor which detects the moisture on the windshield and automatically controls the windshield wiper as a function of the moisture.
- Such a windshield wiper control has the disadvantage, however, that wiping is also carried out when it has stopped raining, because the set threshold value can then still be exceeded. As a result, the windshield wiper would be switched off too late and wipe dry.
- Windshield wiper motor causes.
- a sensor which differentiates the water drops hitting the windshield according to their size (EP-A-0 549 010).
- This sensor has two electrodes, between which there are gaps that change in size. As a result, large gaps are only bridged by large drops.
- an optical rain sensor for a windshield wiper control which contains a plurality of light transmitters and receivers, the light signals received by a light receiver being compared with a reference level. If the reference level is exceeded, the sensor emits a signal. On the basis of the number of level violations, the state on the outside of the windshield is inferred (US Pat. No. 4,867,561).
- the disadvantage here is that about fifteen Light transmitters and receivers must be used.
- a device for the automatic control of a windshield wiper motor which is equipped with a moisture sensor which is dependent on
- This device also has an evaluation device which evaluates the signal of the moisture sensor, the sensor output signal changing over time.
- a circuit arrangement is provided, which is provided with a switch-on threshold dependent on the sensor signal.
- Jump behavior of a direct or alternating current and amplifies it.
- a counter is provided in the known control, which is reset to zero after each triggering of the windshield wiper motor. However, the number of times a threshold value curve has been exceeded by a curve generated by the sensor is not counted.
- the invention is based on the object of evaluating the output signal of only one moisture sensor in such a way that different moisture states on a windshield can be distinguished.
- the advantage achieved by the invention is, in particular, that the mere counting of events on the windshield that lead to a change in moisture can be used to infer various moisture states.
- the windscreen wiper motor is activated in accordance with these moisture conditions.
- Fig. 1 shows the output signal of a moisture sensor with one of these
- FIG. 2 shows an output signal and a function value signal corresponding to FIG. 1, but in the output signal there is a pulse-like change with a large amplitude
- 3 shows a sensor output signal with an associated function value signal, two pulse-like changes with large amplitude occurring in close proximity to one another in the sensor output signal
- Fig. 4 shows a sensor output signal with associated function value signal, the sensor output signal constantly approaching the function value signal.
- FIG. 1 shows the output signal 1 of a moisture sensor, not shown, which changes as a function of the moisture present on the outside of a windshield.
- This moisture sensor can be designed, for example, as it is shown in FIG. 3 of WO 90/08680, ie. H. consist of an ohmic resistance, which is located on the outside of a windshield and changes depending on the moisture present.
- This sensor is wiped by at least one wiper blade.
- this sensor optically, capacitively or in some other way.
- the figures described below relate to an ohmic resistance, which can change in the range from 0 to ⁇ ohms.
- the resistance range which occurs in practice extends from approximately 10 k ⁇ to 100 M ⁇ , which is indicated on the non-linear ordinate of FIG. 1.
- the time period considered in FIG. 1 is approximately 10 seconds. Similar representations would result if the conductance was given on the ordinate instead of the resistance.
- the term “threshold value violation” or “threshold value violation” used below is therefore only clearly defined in connection with the seconds considered in each case.
- the ordinate on which the resistance is plotted is not linear, but quasi-logarithmic.
- the amplitude of the output signal S is sampled cyclically, for example with a clock frequency of 10 kHz.
- a function wide curve F which represents a threshold value curve.
- this threshold value curve is a straight line running parallel to the abscissa. However, it can be changed so that it is basically a variable threshold value curve that can be generated with specific switching elements (WO 90/08680) or by means of a programmed computer.
- the respectively valid threshold value is based on the maximum value occurring with output signal 1.
- the criterion for triggering the windshield wiper motor is the number of moisture events on the windshield that exceed a certain threshold value. This number can be set freely. According to the example in FIG. 1, six events are required in order to activate the windshield wiper motor.
- the sensor output signal S is approximately constant, ie there is no moisture event on the windshield.
- a raindrop or an insect on the sensor and causes the ohmic resistance to drop suddenly by a certain amount.
- the resistance does not only change in general, but by a certain amount. This amount of change is so large that the function value curve F is undershot.
- To take an amount of change for the decisive criterion is already known from the mentioned WO 90/08680.
- the drop below the threshold F is determined and stored. Although the amount of change in moisture has reached the value required for switching on the windshield wiper, it should not be switched on because the reduction in resistance could be a one-time event which did not involve switching on the wiping process worth it.
- the moisture evaporates due to the wind, heat or other factors. what is expressed by curve section I.
- the wiper which in the present case is a single-arm wiper, now begins to wipe. At the beginning of the wiping process, the memory that counted and saved the previous events is deleted.
- a new function threshold F is calculated.
- the distance a between the curve V and the new threshold value F is determined by a predetermined formula, which, however, allows adjustable parameters, i. H. the distance a can be adjusted according to the respective requirements or needs. It is thus also possible to accommodate individual requests and to set the automatic wiper system to be “sensitive” or “less sensitive”.
- Another event occurs at time t ⁇ , but this time it is above the new threshold. However, no attention is paid to wiper activity. However, the sensor value S represents a new maximum after the threshold value has been reset to F ', so that a new threshold value F "is calculated again. The further event which occurs at time tg lies above this new threshold value , whereby neither the windshield wiper is influenced nor a new threshold value is calculated.
- flank D The start of sweeping over the sensor on the way back of the wiper blade
- the flank labeled E characterizes the moisture state when the wiper blade leaves the sensor.
- edge G The end of the wiping process is identified by edge G.
- the time period between the flanks G and A is generally predetermined by the respective wiper installed in the motor vehicle. Since the arrangement according to the invention can also be used retrospectively with existing windshield wipers of any kind, the respective time segment A - G is irrelevant. Rather, the essential information is obtained from the flanks D and E, the steepness in the curve region X possibly also being determined.
- a high resistance value is established, which is characterized by the curve piece XI.
- the threshold value F rises to its old level.
- the new event occurring at time t j 2 remains irrelevant because it does not reach the threshold value F.
- FIG. 2 shows the change in a sensor output signal S when a unique and thick one occurs
- the resistance increases again after the rapid decrease, which is characterized by the edge H.
- the deep drop in the resistance value according to edge M does not trigger the windshield wiper however, that the function value threshold is redefined.
- the curve area N of the function value F ' the curve has a staircase shape, which results from the digital extrapolation of the new threshold value.
- threshold F ' Do not fall below threshold F '. They also do not form a new threshold since they do not contain any new maxima.
- FIG. 3 shows curve profiles which largely correspond to the curve profile in FIG. 2. Unlike there, however, the wiper is operated. As can be seen from FIG. 3, a large event occurs at time t j . This major event is followed by another major event at time t2. The windshield wiper is then activated immediately, which means that it does not count up until six events have occurred, but switches to two events. The number Z of moisture events that lead to the triggering of the windshield wiper is therefore itself a function of the magnitude of the moisture change. The function value F is newly determined, which results in the function value F '.
- the flanks K and L at times t and i ⁇ indicate the changes in resistance which result when the wiper blade sweeps over the sensor on its way out.
- flanks P and Q indicate that the sensor is swept by the wiper blade on the way back.
- S and F are back on their old one
- the wiper is activated between t $ and t2-
- Curve R denotes the sensor output signal when the wiper touches the sensor on the way there.
- the curve T denotes the signal when the wiper has left the sensor on the way there.
- the functional threshold value F " is adapted to the curve T. If the wiper touches the sensor on the way back, the resistance value drops again rapidly, which is indicated by the edge U. If the sensor is exited by the wiper blade on the way back , the resistance curve rises, which is characterized by the curve section W. As the resistance curve rises, the functional curve is also extrapolated, which is represented by the curve section X. The windshield wiper is switched on between times t3 and t2.
- the curve section X has a staircase shape which results from the fact that each new maximum value of W requires a digital recalculation of the function value F.
- the invention can be implemented with the aid of discrete switching elements or with the aid of programmed computers. Since the discrete switching means for implementing the invention are known, they need not be described in more detail.
- the sensor signal represents a change in resistance, capacitance or a light reflection factor. It is only essential that there is a functional relationship between the sensor signal and the moisture on the windshield.
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Control Of Multiple Motors (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9407772A BR9407772A (pt) | 1993-10-08 | 1994-09-27 | Dispositivo para o controle automático de motor de um limpador de para-brisa |
EP94928261A EP0720547B1 (de) | 1993-10-08 | 1994-09-27 | Einrichtung für die automatische steuerung eines scheibenwischermotors |
JP7511155A JPH09503464A (ja) | 1993-10-08 | 1994-09-27 | ウインドシールドワイパーモータの自動制御用デバイス |
US08/624,594 US5729105A (en) | 1993-10-08 | 1994-09-27 | Moisture actuated device for automatic control of a windscreen wiper motor |
DE59403200T DE59403200D1 (de) | 1993-10-08 | 1994-09-27 | Einrichtung für die automatische steuerung eines scheibenwischermotors |
KR1019960701829A KR100348028B1 (ko) | 1993-10-08 | 1994-09-27 | 자동차앞유리와이퍼모터의자동제어장치 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4334381.3 | 1993-10-08 | ||
DE4334381A DE4334381C2 (de) | 1993-10-08 | 1993-10-08 | Einrichtung für die automatische Steuerung eines Scheibenwischermotors |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995010434A1 true WO1995010434A1 (de) | 1995-04-20 |
Family
ID=6499741
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1994/001134 WO1995010434A1 (de) | 1993-10-08 | 1994-09-27 | Einrichtung für die automatische steuerung eines scheibenwischermotors |
Country Status (10)
Country | Link |
---|---|
US (1) | US5729105A (de) |
EP (1) | EP0720547B1 (de) |
JP (1) | JPH09503464A (de) |
KR (1) | KR100348028B1 (de) |
AT (1) | ATE154557T1 (de) |
BR (1) | BR9407772A (de) |
CA (1) | CA2172621A1 (de) |
DE (2) | DE4334381C2 (de) |
ES (1) | ES2105756T3 (de) |
WO (1) | WO1995010434A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5568027A (en) * | 1995-05-19 | 1996-10-22 | Libbey-Owens-Ford Co. | Smooth rain-responsive wiper control |
DE19519566C1 (de) * | 1995-05-27 | 1996-07-11 | Bosch Gmbh Robert | Vorrichtung zum Betreiben eines Scheibenwischers |
DE19519567B4 (de) * | 1995-05-27 | 2004-04-15 | Robert Bosch Gmbh | Vorrichtung zum Betreiben eines Scheibenwischers |
DE19614100C2 (de) * | 1996-04-10 | 2000-12-07 | Bosch Gmbh Robert | Vorrichtung zur Ermittlung des Zustandes eines Wischerblattes |
DE19742657A1 (de) * | 1997-09-26 | 1999-04-01 | Bosch Gmbh Robert | Wischvorrichtung |
US5894265A (en) * | 1998-02-05 | 1999-04-13 | Hemingway; David | Driving condition dependent braking light |
DE10009797B4 (de) * | 2000-03-01 | 2008-05-15 | Valeo Auto-Electric Wischer Und Motoren Gmbh | Scheibenwischervorrichtung zum Wischen von Scheiben |
DE10152998C2 (de) * | 2001-10-26 | 2003-12-04 | Preh Elektro Feinmechanik | Sensoreinheit zur Detektion einer inneren und äußeren Benetzung einer Scheibe |
GB2471674A (en) * | 2009-07-07 | 2011-01-12 | Nissan Motor Mfg | A wash-wipe system for a vehicle transparent member |
US9561806B2 (en) * | 2015-02-25 | 2017-02-07 | Electro-Motive Diesel, Inc. | Visibility control system and method for locomotive |
US10970947B1 (en) * | 2020-03-13 | 2021-04-06 | Gm Global Technology Operations, Llc | System and method to provide a rear window wiper usage notification |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4867561A (en) * | 1986-08-22 | 1989-09-19 | Nippondenso Co., Ltd. | Apparatus for optically detecting an extraneous matter on a translucent shield |
WO1990008680A2 (de) * | 1989-01-26 | 1990-08-09 | Etablissement Voralp | Einrichtung für die steuerung eines antriebsmittels für ein fahrzeugzubehör |
EP0443080A1 (de) * | 1990-01-12 | 1991-08-28 | VDO Adolf Schindling AG | Verfahren und Anordnung zur Steuerung eines Scheibenwischers |
EP0547337A1 (de) * | 1991-12-14 | 1993-06-23 | Leopold Kostal GmbH & Co. KG | Einrichtung zur Steuerung einer Scheibenwischanlage |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2630470A1 (de) * | 1976-07-07 | 1978-01-12 | Schmidt Karl Heinz | Selbsttaetige steuerung von kraftfahrzeug-scheibenwischanlagen |
DK146959C (da) * | 1981-12-08 | 1984-08-06 | Boeegh Petersen Allan | Viskerrobot med foeler |
DE3314770A1 (de) * | 1983-04-23 | 1984-10-31 | Sidler GmbH & Co, 7400 Tübingen | Einrichtung zum steuern eines scheibenwischermotors |
DE3722510A1 (de) * | 1987-07-08 | 1989-01-26 | Bosch Gmbh Robert | Vorrichtung zum regenabhaengigen ein- und ausschalten eines elektrischen scheibenwischermotors |
US5057754A (en) * | 1988-10-14 | 1991-10-15 | Mist-Defy'r, Inc. | Moisture-sensing window cleaning control system |
US5216341A (en) * | 1988-12-19 | 1993-06-01 | Fujitsu Ten Limited | Windshield wiper control apparatus |
US4916374A (en) * | 1989-02-28 | 1990-04-10 | Donnelly Corporation | Continuously adaptive moisture sensor system for wiper control |
US5059877A (en) * | 1989-12-22 | 1991-10-22 | Libbey-Owens-Ford Co. | Rain responsive windshield wiper control |
US5319293A (en) * | 1991-12-14 | 1994-06-07 | Leopold Kostal Gmbh & Co. | Apparatus and method for controlling a windshield wiping system |
EP0549010B1 (de) * | 1991-12-20 | 1996-02-07 | General Motors Corporation | Wassertropfensensor |
US5453670A (en) * | 1994-01-03 | 1995-09-26 | Schaefer; Eric G. | Method of controlling a windshield wiper system |
DE4421906C2 (de) * | 1994-06-24 | 1996-10-24 | Vdo Schindling | Verfahren und Schaltungsanordnung zur Messung des Widerstandes eines Widerstandssensors |
US5568027A (en) * | 1995-05-19 | 1996-10-22 | Libbey-Owens-Ford Co. | Smooth rain-responsive wiper control |
-
1993
- 1993-10-08 DE DE4334381A patent/DE4334381C2/de not_active Expired - Fee Related
-
1994
- 1994-09-27 WO PCT/DE1994/001134 patent/WO1995010434A1/de not_active Application Discontinuation
- 1994-09-27 KR KR1019960701829A patent/KR100348028B1/ko not_active IP Right Cessation
- 1994-09-27 CA CA002172621A patent/CA2172621A1/en not_active Abandoned
- 1994-09-27 US US08/624,594 patent/US5729105A/en not_active Expired - Lifetime
- 1994-09-27 JP JP7511155A patent/JPH09503464A/ja active Pending
- 1994-09-27 EP EP94928261A patent/EP0720547B1/de not_active Revoked
- 1994-09-27 AT AT94928261T patent/ATE154557T1/de not_active IP Right Cessation
- 1994-09-27 BR BR9407772A patent/BR9407772A/pt not_active IP Right Cessation
- 1994-09-27 ES ES94928261T patent/ES2105756T3/es not_active Expired - Lifetime
- 1994-09-27 DE DE59403200T patent/DE59403200D1/de not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4867561A (en) * | 1986-08-22 | 1989-09-19 | Nippondenso Co., Ltd. | Apparatus for optically detecting an extraneous matter on a translucent shield |
WO1990008680A2 (de) * | 1989-01-26 | 1990-08-09 | Etablissement Voralp | Einrichtung für die steuerung eines antriebsmittels für ein fahrzeugzubehör |
EP0443080A1 (de) * | 1990-01-12 | 1991-08-28 | VDO Adolf Schindling AG | Verfahren und Anordnung zur Steuerung eines Scheibenwischers |
EP0547337A1 (de) * | 1991-12-14 | 1993-06-23 | Leopold Kostal GmbH & Co. KG | Einrichtung zur Steuerung einer Scheibenwischanlage |
DE4217391A1 (de) * | 1991-12-14 | 1993-12-02 | Kostal Leopold Gmbh & Co Kg | Einrichtung zur Steuerung einer Scheibenwischanlage |
Also Published As
Publication number | Publication date |
---|---|
DE4334381A1 (de) | 1995-04-13 |
US5729105A (en) | 1998-03-17 |
DE59403200D1 (de) | 1997-07-24 |
JPH09503464A (ja) | 1997-04-08 |
ES2105756T3 (es) | 1997-10-16 |
DE4334381C2 (de) | 2001-06-28 |
BR9407772A (pt) | 1997-03-18 |
KR100348028B1 (ko) | 2002-11-29 |
ATE154557T1 (de) | 1997-07-15 |
EP0720547B1 (de) | 1997-06-18 |
EP0720547A1 (de) | 1996-07-10 |
CA2172621A1 (en) | 1995-04-20 |
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