EP1361972A1 - Device for automatically cleaning windows - Google Patents

Device for automatically cleaning windows

Info

Publication number
EP1361972A1
EP1361972A1 EP01989378A EP01989378A EP1361972A1 EP 1361972 A1 EP1361972 A1 EP 1361972A1 EP 01989378 A EP01989378 A EP 01989378A EP 01989378 A EP01989378 A EP 01989378A EP 1361972 A1 EP1361972 A1 EP 1361972A1
Authority
EP
European Patent Office
Prior art keywords
signal
cleaning
sensor
cleaning device
control device
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Withdrawn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
EP01989378A
Other languages
German (de)
French (fr)
Inventor
Achim Neubauer
Martin-Peter Bolz
Jochen Moench
Hartmut Krueger
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 EP1361972A1 publication Critical patent/EP1361972A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
    • G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • 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
    • B60S1/0855—Ultrasonic rain sensor
    • 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
    • B60S1/46—Cleaning windscreens, windows or optical devices using liquid; Windscreen washers
    • B60S1/48—Liquid supply therefor
    • B60S1/481—Liquid supply therefor the operation of at least part of the liquid supply being controlled by electric means
    • B60S1/486—Liquid supply therefor the operation of at least part of the liquid supply being controlled by electric means including control systems responsive to a vehicle driving condition, e.g. speed
    • 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
    • B60S1/56—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens
    • B60S1/58—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens for rear windows
    • B60S1/583—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens for rear windows including wiping devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/539—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/885—Meteorological systems

Definitions

  • the invention relates to a device for the automatic cleaning of panes of the type of independent
  • the device according to the invention for the automatic cleaning of panes has the advantage that by using a sensor device which is able to emit signals, which are dependent on the distances between it and other fixed objects in its detection area on the one hand and on environmental parameters on the other hand, only one sensor device is necessary for various possible uses in the motor vehicle.
  • the sensor device can thus detect solid objects, such as other vehicles, walls, posts or pillars, which is advantageous at low driving speeds, for example when parking or in very narrow construction areas, but also recognize environmental parameters such as rain, drizzle, snow or hail.
  • the activities of the windshield wiper can then be matched to these measurement results, which is particularly advantageous at higher driving speeds.
  • Ultrasonic sensor trained because they are reliable and durable and emit signals that are easy to process.
  • the sensor device is part of a parking pilot system.
  • ultrasonic sensors are used to estimate the distance of a vehicle from an obstacle with the aid of ultrasonic pulses based on the echo sounder principle and to provide the driver of the vehicle with a warning signal if a certain critical minimum distance is undershot.
  • these sensors can not only be used to monitor the wetness of the road, but in particular also to detect a precipitation density.
  • the device for detection of precipitation in a motor vehicle is needed especially when driving at normal cruising speed, whereas the parking aid system only has to work when the vehicle is moving at walking speed or even slower.
  • the signals from the sensors can therefore be dynamically assigned to the parking aid system or the control device for controlling the cleaning device as a function of the vehicle speed, without conflicts between the two occurring.
  • controller for controlling the cleaning device is connected to other driving status information transmitters. In this way, a maximum number of signals about the driving state can be used to control the cleaning device, as a result of which its function is further optimized.
  • control device is still connected to a windscreen rain sensor. and controls the cleaning device as a function of its signals.
  • an optimal wiping strategy for the vehicle window can be determined from these signals.
  • the wiping strategy can be determined without taking into account the sensor signals, since the sensor device is used as a parking pilot.
  • the wiping strategy can be carried out taking into account the signals of the sensor device, despite the reverse gear being engaged, since it is of a longer duration Reverse drive - for example in a parking lot - is assumed.
  • Taking the ambient temperature into account is particularly advantageous, since the rate of evaporation of moisture on the windows of the vehicle also increases with increasing temperature.
  • the sensor device has integrated signal processing, shielding is saved in the connections between the sensor device and the control device, as a result of which costs can be reduced.
  • the cleaning device is designed as a wiping-washing system, the device can be retrofitted into an existing vehicle at low cost.
  • the inventive method according to claim 9 has the advantage that the method for controlling a cleaning device is efficient and reliable. The process is also easy to implement.
  • Figure 2 shows an ultrasonic sensor in perspective
  • Figures 3a and 3b signals from a sensor in the rain and drizzle. Description of the embodiment
  • FIG. 1 shows a schematic representation of a device according to the invention.
  • the sensor device 10 has a plurality of ultrasonic sensors which are part of a parking pilot system of a motor vehicle. Depending on the system, these parking pilot systems are usually only active when driving slowly or in reverse and emit an ultrasonic signal. If this ultrasound signal is reflected on fixed, in particular stationary objects, this is detected in sensor device 10 and an acoustic or optical signal is sent to the vehicle driver when certain distances between sensor device 10 and the fixed, stationary object are reached or undershot. This detection range is usually around one meter.
  • the sensor device 10 is also active during normal driving operation, however, in this device it does not emit ultrasound signals, but only receives incoming signals from other signal sources.
  • the sensor device 10 is connected to a multiplexer 12 which multiplexes the signals of the individual ultrasound sensors on two output channels 18.
  • the multiplexer 12 is connected to a counter 14 which is clocked via a clock generator 16.
  • the two output channels 18 of the multiplexer 12 are each connected to a high-pass filter 20, which forwards the signal to an amplifier 22.
  • the outputs of these amplifiers 22 are in turn connected to the inputs of the integrators 24, which are the signal in one Integrate a time window of a few ⁇ s.
  • the integrators 24 have a further input which is set to ground in the cycle which is predetermined by a further clock generator 26, which causes a reset.
  • the counter 14 receives the inverted output signal of the further clock generator 26, which also causes the integrators 24 to be reset.
  • the outputs of the integrators 24 are connected to comparators 28 which compare these summed or integrated signals with thresholds S1, S2, respectively. At the output of these comparators, the signal is supplied to the control device 32 via onostable flip-flops 30. The output of the control device 32 is connected to the cleaning device 34. This has a wiper motor 36, the output shaft of which is directly or indirectly connected to a wiper 38.
  • the sensor device 10 emits signals which are processed by the multiplexer 12. Typically, eight ultrasonic sensors are used, four of which are attached to the front of the vehicle and another four are attached to the rear of the vehicle. These are fed via two output channels 18 to the high passes 20, which may be present. Filter out the DC voltage level and low-frequency interference pulses. The signal is then amplified by the amplifiers 22 and fed to the integrators 24. The signal supplied to the integrators 24 is integrated over a period of time predetermined by the further clock generator 26. After the time period, the integrators 24 are reset and the integrated signal is forwarded to the comparators 28. These compare these integrated signals with thresholds S1 and S2. The integrated Sum signals can of course also be processed in further steps or can be fed directly to the control device 32, which can control the cleaning device 34 as a function of these input signals.
  • FIG. 1 An ultrasonic sensor with an open housing is shown schematically in FIG. This essentially consists of a printed circuit board 40 on which an IC 42 is arranged.
  • the circuit board is connected to a piezo element 45 on the side facing the detection area by means of a flexible film 43.
  • a matching coil 47 and - on the side facing away from the flexible film 43 - plug contacts 49 are arranged on the printed circuit board 40.
  • This ultrasonic sensor is encased in a metal or plastic housing 51 and is typically built into the bumpers of a motor vehicle.
  • the plug contacts 49 have four pins, one of which can be used to unamplify an analog signal that is normally only available for measuring purposes and cannot be processed.
  • This signal provides information about environmental parameters in the detection range of the sensor device. These environmental parameters can be, for example, rain or snow, but also splash water which has been whirled up by the tires of the motor vehicle.
  • FIGS. 3a and 3b show the signal which is tapped at the connector pins 49 for two different situations.
  • Figure 3a shows the signal of an ultrasonic sensor over time in the rain, which is characterized by many individual needle peaks.
  • Figure 3b shows the same signal for drizzle / spray, which has only a few individual needle peaks above a noise.
  • the control device 32 can also be connected to other driving status information transmitters 53, which provide information about the driving status, for example the ambient temperature, in particular as a measure of the driving status
  • Driving state information is also used by the control device 32 to control the cleaning device 34.
  • control device 32 calculates, depending on the amplitude spectrum of the signal from the sensor device 10, the intensity of the signal and the vehicle speed, the amount of water that will get onto the window of the vehicle, specific to the vehicle.
  • Drip precipitation increases on the rear window of the vehicle with increasing droplet size.
  • a surge detection in the control device in order to recognize suddenly occurring surge of water, for example of a truck driving past, before they reach the window of the vehicle.
  • additional ultrasonic sensors can be arranged on the side of the vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Mechanical Engineering (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Water Supply & Treatment (AREA)
  • Acoustics & Sound (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

The invention relates to a method and a device for controlling a cleaning device of a vehicle. Said device comprises a sensor device (10) which uses ultrasonic sensors for recognising fixed objects for detecting environmental parameters, such as rain or snow.

Description

Vorrichtung zum automatischen Reinigen von ScheibenDevice for automatically cleaning windows
Stand der TechnikState of the art
Die Erfindung betrifft eine Vorrichtung zum automatischen Reinigen von Scheiben nach Gattung des unabhängigenThe invention relates to a device for the automatic cleaning of panes of the type of independent
Anspruchs. Es sind schon zahlreiche Vorrichtungen zum automatischen Reinigen von Scheiben, beispielsweise aus der DE 40 06 420 AI bekannt. Diese funktionieren nach einem optischen Prinzip, bei dem Licht eines Senders in die Windschutzscheibe eingekoppelt wird, an der benetzten Fläche zumindest partiell reflektiert wird und anschließend zu einem Empfänger ausgekoppelt wird.Claim. There are already numerous devices for automatically cleaning windows, for example from DE 40 06 420 AI. These work according to an optical principle in which light from a transmitter is coupled into the windshield, is at least partially reflected on the wetted surface and is then coupled out to a receiver.
Weiters ist aus der DE 198 43 563 AI bekannt, mit Hilfe eines Ultraschallsensors eines Parkpilotsystems aufgewirbelte Sprühnässe im Heckbereich eines Kraftfahrzeuges zu dete'ktieren und die Lichtverteilung der Scheinwerfer des Kraftfahrzeugs in Abhängigkeit vom daraus bestimmten Fahrbahnzustand anzupassen.It is also known from DE 198 43 563 AI, with the aid of an ultrasonic sensor of a parking pilot system swirled Sprühnässe in the rear area ktieren of a motor vehicle to an end 'and to adjust the light distribution of the headlight of the motor vehicle in dependence on the determined therefrom road condition.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Vorrichtung zum automatischen Reinigen von Scheiben hat den Vorteil, daß durch die Verwendung einer Sensoreinrichtung, die in der Lage ist Signale abzugeben, die von den Abständen zwischen ihr und anderen festen Gegenständen in ihrem Erfassungsbereich einerseits und von Umweltparametern andererseits abhängig sind, nur eine Sensoreinrichtung für verschiedene Nutzmöglichkeiten im Kraftfahrzeug notwendig ist. So kann die Sensoreinrichtung feste Gegenstände, wie andere Fahrzeuge, Wände, Pfosten oder Pfeiler erkennen, was bei niedrigen Fahrgeschwindigkeiten, beipielsweise beim Einparken oder in sehr engen Baustεllenbereichen von Vorteil ist, aber auch Umweltparameter wie beispielsweise Regen, Nieselregen, Schnee oder Hagel erkennen. Die Aktivitäten des Scheibenwischers können daraufhin auf diese Meßergebnisse abgestimmt werden, was besonders bei höheren Fahrgeschwindigkeiten vorteilhaft ist.The device according to the invention for the automatic cleaning of panes has the advantage that by using a sensor device which is able to emit signals, which are dependent on the distances between it and other fixed objects in its detection area on the one hand and on environmental parameters on the other hand, only one sensor device is necessary for various possible uses in the motor vehicle. The sensor device can thus detect solid objects, such as other vehicles, walls, posts or pillars, which is advantageous at low driving speeds, for example when parking or in very narrow construction areas, but also recognize environmental parameters such as rain, drizzle, snow or hail. The activities of the windshield wiper can then be matched to these measurement results, which is particularly advantageous at higher driving speeds.
Durch die in den Unteransprüchen aufgeführten Maßnahmen, ergeben sich vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Merkmale.The measures listed in the subclaims result in advantageous developments and improvements of the features specified in the main claim.
Vorteilhafterweise ist die Sensoreinrichtung alsThe sensor device is advantageously a
Ultraschallsensor ausgebildet, da diese zuverlässig und langlebig sind und Signale abgeben, die gut zu verarbeiten sind.Ultrasonic sensor trained because they are reliable and durable and emit signals that are easy to process.
Besonders vorteilhaft ist dabei, wenn die Sensoreinrichtung Teil eines Parkpilotsystems ist. Bei diesen Systemen werden Ultraschallsensoren eingesetzt, um mit Hilfe von Ultraschallimpulsen nach dem Echolotprinzip den Abstand eines Fahrzeuges von einem Hindernis abzuschätzen und dem Fahrer des Fahrzeugs ein -Warnsignal zu liefern, wenn ein bestimmter kritischer Mindestabstand unterschritten wird. Diese Sensoren können gleichzeitig nicht nur zur Überwachung der Fahrbahnnässe eingesetzt werden, sondern insbesondere auch zur Erkennung einer Niederschlagsdichte. Dabei ist insbesondere vorteilhaft, daß die Vorrichtung zur Erfassung von Niederschlag in einem Kraftfahrzeug vor allem beim Fahren mit normaler Reisegeschwindigkeit benötigt wird, während das Einparkhilfesystem nur arbeiten muß, wenn sich das Fahrzeug mit Schrittgeschwindigkeit oder noch langsamer bewegt. Die Signale der Sensoren können daher in Abhängigkeit von der Fahrzeuggeschwindigkeit dynamisch dem Einparkhilfesystem oder der Steuereinrichtung zur Steuerung der Reinigungseinrichtung zugeordnet werden, ohne daß Konflikte zwischen diesen beiden auftreten.It is particularly advantageous if the sensor device is part of a parking pilot system. In these systems, ultrasonic sensors are used to estimate the distance of a vehicle from an obstacle with the aid of ultrasonic pulses based on the echo sounder principle and to provide the driver of the vehicle with a warning signal if a certain critical minimum distance is undershot. At the same time, these sensors can not only be used to monitor the wetness of the road, but in particular also to detect a precipitation density. It is particularly advantageous that the device for detection of precipitation in a motor vehicle is needed especially when driving at normal cruising speed, whereas the parking aid system only has to work when the vehicle is moving at walking speed or even slower. The signals from the sensors can therefore be dynamically assigned to the parking aid system or the control device for controlling the cleaning device as a function of the vehicle speed, without conflicts between the two occurring.
Besonders vorteilhaft ist dabei, wenn die Steuerung zur Steuerung der Reinigungseinrichtung mit weiteren Fahrzustandsinformationsgebern verbunden ist. Auf diese Weise kann eine maximale Anzahl von Signalen über den Fahrzustand zur Steuerung der Reinigungseinrichtung herangezogen werden, wodurch deren Funktion weiter optimiert wird.It is particularly advantageous if the controller for controlling the cleaning device is connected to other driving status information transmitters. In this way, a maximum number of signals about the driving state can be used to control the cleaning device, as a result of which its function is further optimized.
Besonders vorteilhaft ist es, wenn die Steuereinrichtung noch mit einem Frontscheibenregensensor verbunden ist. und die Reinigungseinrichtung in Abhängigkeit von dessen Signalen steuert.It is particularly advantageous if the control device is still connected to a windscreen rain sensor. and controls the cleaning device as a function of its signals.
Werden als Fahrzustandsinformationen die Signale der Fahrzeuggeschwindigkeit, der Getriebestellung sowie der Umgebungstemperatur der Steuereinrichtung zugeleitet, so kann aus diesen Signalen eine optimale Wischstrategie für die Fahrzeugscheibe bestimmt werden. So kann bei langsamer Fahrzeuggeschwindigkeit mit eingelegtem Rückwärtsgang die Wischstrategie ohne Berücksichtigung der Sensorsignale bestimmt werden, da die Sensoreinrichtung als Parkpilot verwendet wird. Bei höherer FahrZeuggeschwindigkeit kann im Gegensatz dazu, trotz eingelegtem Rückwärtsgang die Wischstrategie unter Berücksichtigung der Signale der Sensoreinrichtung erfolgen, da von einer längeren Rückwärtsfahrt - beispielsweise auf einem Parkplatz - ausgegangen wird. Die Berücksichtigung der Umgebungstemperatur ist insbesondere vorteilhaft;, da die Verdunstungsrate von Feuchtigkeit auf den Scheiben des Fahrzeugs mit steigender Temperatur ebenfalls steigt.If the signals of the vehicle speed, the gearbox position and the ambient temperature are fed to the control device as driving state information, an optimal wiping strategy for the vehicle window can be determined from these signals. Thus, when the vehicle speed is slow and reverse gear is engaged, the wiping strategy can be determined without taking into account the sensor signals, since the sensor device is used as a parking pilot. In contrast, at higher vehicle speed, the wiping strategy can be carried out taking into account the signals of the sensor device, despite the reverse gear being engaged, since it is of a longer duration Reverse drive - for example in a parking lot - is assumed. Taking the ambient temperature into account is particularly advantageous, since the rate of evaporation of moisture on the windows of the vehicle also increases with increasing temperature.
Weist die Sensoreinrichtung eine integrierte Signalaufbereitung auf, so werden Abschirmungen bei den Verbindungen zwischen der Sensoreinrichtung und der Steuereinrichtung eingespart, wodurch Kosten reduziert werden können. Insbesondere ist es vorteilhaft, Mittel zur Signalverstarkung und/oder Bandfilterung oder Mittel zur Erkennung der Umweltparameter, beispielsweise ein Thermometer, direkt in die Sensoreinrichtung zu integrieren.If the sensor device has integrated signal processing, shielding is saved in the connections between the sensor device and the control device, as a result of which costs can be reduced. In particular, it is advantageous to integrate means for signal amplification and / or band filtering or means for recognizing the environmental parameters, for example a thermometer, directly into the sensor device.
Ist die Reinigungseinrichtung als Wisch-Wasch-Anlage ausgebildet, so ist die Vorrichtung mit nur geringem Kostenaufwand in ein bestehendes Fahrzeug nachzurusten.If the cleaning device is designed as a wiping-washing system, the device can be retrofitted into an existing vehicle at low cost.
Das erfindungsgemaße Verfahren nach Anspruch 9 hat den Vorteil, daß das Verfahren zur Steuerung einer Reinigungseinrichtung effizient und zuverlässig ist. Darüber hinaus ist das Verfahren einfach zu realisieren.The inventive method according to claim 9 has the advantage that the method for controlling a cleaning device is efficient and reliable. The process is also easy to implement.
Zeichnungendrawings
Ein Ausfuhrungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung naher erläutert. Es zeigt Figur 1 eine schematische Zeichnung der erfindungsgemaßenAn exemplary embodiment of the invention is shown in the drawings and explained in more detail in the following description. 1 shows a schematic drawing of the inventive
Vorrichtung,Contraption,
Figur 2 einen Ultraschallsensor in perspektivischerFigure 2 shows an ultrasonic sensor in perspective
Darstellung,Presentation,
Figur 3a und 3b Signale eines Sensors bei Regen und Nieselregen. Beschreibung des AusführungsbeispielsFigures 3a and 3b signals from a sensor in the rain and drizzle. Description of the embodiment
Figur 1 zeigt eine schematische Darstellung einer erfindungsgemäßen Vorrichtung. Die Sensoreinrichtung 10 weist mehrere Ultraschallsensoren auf, die Teil eines Parkpilotsystems eines Kraftfahrzeuges sind. Diese Parkpilotsysteme sind normalerweise - je nach System - nur bei langsamer Fahrt oder bei Rückwärtsfahrt aktiv und geben ein Ultraschallsignal ab. Wird dieses Ultraschallsignal an festen, insbesondere ruhenden Gegenständen reflektiert, so wird dies in der Sensoreinrichtung 10 erfaßt und ein akustisches oder optisches Signal an den Fahrzeuglenker abgegeben, wenn bestimmte Abstände zwischen Sensoreinrichtung 10 und dem festen, ruhenden Gegenstand erreicht, bzw. unterschritten werden. Dieser Erfassungsbereich beträgt normalerweise etwa einen Meter.Figure 1 shows a schematic representation of a device according to the invention. The sensor device 10 has a plurality of ultrasonic sensors which are part of a parking pilot system of a motor vehicle. Depending on the system, these parking pilot systems are usually only active when driving slowly or in reverse and emit an ultrasonic signal. If this ultrasound signal is reflected on fixed, in particular stationary objects, this is detected in sensor device 10 and an acoustic or optical signal is sent to the vehicle driver when certain distances between sensor device 10 and the fixed, stationary object are reached or undershot. This detection range is usually around one meter.
Bei der erfindungsgemäßen Vorrichtung ist die Sensoreinrichtung 10 auch bei normalem Fahrbetrieb aktiv, jedoch sendet sie in diesem keine Ultraschallsignale aus, sondern empfängt nur eingehende Signale anderer Signalquellen.In the device according to the invention, the sensor device 10 is also active during normal driving operation, however, in this device it does not emit ultrasound signals, but only receives incoming signals from other signal sources.
Die Sensoreinrichtung 10 sind mit einem Multiplexer 12 verbunden, welcher die Signale der einzelnen ülteraschallsensoren auf zwei Ausgangskanäle 18 multiplext. Dazu ist der Multiplexer 12 mit einem Zähler 14 verbunden, der über einen Taktgeber 16 getaktet ist.The sensor device 10 is connected to a multiplexer 12 which multiplexes the signals of the individual ultrasound sensors on two output channels 18. For this purpose, the multiplexer 12 is connected to a counter 14 which is clocked via a clock generator 16.
Die beiden Ausgangskanäle 18 des Multiplexers 12 sind mit jeweils einem Hochpaß 20 verbunden, welcher das Signal an jeweils einen Verstärker 22 weiterleitet. Die Ausgänge dieser Verstärker 22 sind wiederum mit den Eingängen der Integratoren 24 verbunden, welche das Signal in einem Zeitfenster von einigen μs integrieren. Dazu weisen die Integratoren 24 einen weiteren Eingang auf, der im Takt, der von einem weiteren Taktgeber 26 vorgegeben wird, auf Masse gesetzt wird, was ein Zurücksetzen verursacht. Zur Synchronisation des Multiplexers 12 erhält der Zähler 14 das invertierte Ausgangssignal des weiteren Taktgebers 26, welcher auch das Zurücksetzen der Integratoren 24 bewirkt.The two output channels 18 of the multiplexer 12 are each connected to a high-pass filter 20, which forwards the signal to an amplifier 22. The outputs of these amplifiers 22 are in turn connected to the inputs of the integrators 24, which are the signal in one Integrate a time window of a few μs. For this purpose, the integrators 24 have a further input which is set to ground in the cycle which is predetermined by a further clock generator 26, which causes a reset. To synchronize the multiplexer 12, the counter 14 receives the inverted output signal of the further clock generator 26, which also causes the integrators 24 to be reset.
Die Ausgänge der Integratoren 24 sind mit Komparatoren 28 verbunden, welche diese summierten bzw. integrierten Signale jeweils mit Schwellen Sl, S2 vergleichen. Am Ausgang dieser Komparatoren wird das Signal über onostabile Kippstufen 30 der Steuereinrichtung 32 zugeführt. Der Ausgang der Steuereinrichtung 32 ist mit der Reinigungseinrichtung 34 verbunden. Diese weist einen Wischermotor 36 auf, dessen Abtriebswelle mittelbar oder unmittelbar mit einem Scheibenwischer 38 verbunden ist.The outputs of the integrators 24 are connected to comparators 28 which compare these summed or integrated signals with thresholds S1, S2, respectively. At the output of these comparators, the signal is supplied to the control device 32 via onostable flip-flops 30. The output of the control device 32 is connected to the cleaning device 34. This has a wiper motor 36, the output shaft of which is directly or indirectly connected to a wiper 38.
Im folgenden wird die Funktion der Vorrichtung erläutertThe function of the device is explained below
Die Sensoreinrichtung 10 gibt Signale ab, welche vom Multiplexer 12 verarbeitet werden. Typischerweise werden acht Ultraschallsensoren eingesetzt, von denen vier an der Fahrzeugvorderseite und weitere vier am Fahrzeugheck befestigt sind. Diese werden über zwei Ausgangskanäle 18 den Hochpässen 20 zugeleitet, die einen eventuell vorhandenen. Gleichspannungspegel und niederfrequente Störimpulse ausfiltern. Anschließend wird das Signal von den Verstärkern 22 verstärkt und den Integratoren 24 zugeführt. Über eine vom weiteren Taktgeber 26 vorgegebene Zeitspanne wird das den Integratoren 24 zugeführte Signal integriert. Nach Ablauf der Zeitspanne werden die Integratoren 24 wieder zurückgesetzt und das integrierte Signal an die Komparatoren 28 weitergeleitet. Diese vergleichen diese integrierten Signale mit Schwellen Sl und S2. Die integrierten Summensignale können natürlich auch in weiteren Schritten verarbeitet werden oder aber direkt der Steuereinrichtung 32 zugeführt werden, die in Abhängigkeit dieser Eingangssignale die Reinigungseinrichtung 34 zu steuern vermag.The sensor device 10 emits signals which are processed by the multiplexer 12. Typically, eight ultrasonic sensors are used, four of which are attached to the front of the vehicle and another four are attached to the rear of the vehicle. These are fed via two output channels 18 to the high passes 20, which may be present. Filter out the DC voltage level and low-frequency interference pulses. The signal is then amplified by the amplifiers 22 and fed to the integrators 24. The signal supplied to the integrators 24 is integrated over a period of time predetermined by the further clock generator 26. After the time period, the integrators 24 are reset and the integrated signal is forwarded to the comparators 28. These compare these integrated signals with thresholds S1 and S2. The integrated Sum signals can of course also be processed in further steps or can be fed directly to the control device 32, which can control the cleaning device 34 as a function of these input signals.
In Figur 2 ist ein Ultraschallsensor mit offenem Gehäuse schematisch dargestellt. Dieser besteht im wesentlichen aus einer Leiterplatte 40, auf der ein IC 42 angeordnet ist. Die Leiterplatte ist auf der dem Erfassungsbereich zugewandten Seite mittels einer Flexfolie 43 mit einem Piezoelement 45 verbunden. Darüber hinaus sind auf der Leiterplatte 40 eine Abgleichspule 47 sowie - auf der der Flexfolie 43 abgewandten Seite - Steckerkontakte 49 angeordnet. Ummantelt ist dieser Ultraschallsensor mit einem Metall- oder Kunststoffgehäuse 51 und ist typischerweise in die Stoßfänger eines Kraftfahrzeugs eingebaut.An ultrasonic sensor with an open housing is shown schematically in FIG. This essentially consists of a printed circuit board 40 on which an IC 42 is arranged. The circuit board is connected to a piezo element 45 on the side facing the detection area by means of a flexible film 43. In addition, a matching coil 47 and - on the side facing away from the flexible film 43 - plug contacts 49 are arranged on the printed circuit board 40. This ultrasonic sensor is encased in a metal or plastic housing 51 and is typically built into the bumpers of a motor vehicle.
Die Steckerkontakte 49 weisen vier Pins auf, von denen an einem ein normalerweise nur für Meßzwecke vorhandenes Analogsignal unverstärkt und nicht aufbereitet abgreifbar ist. Dieses Signal gibt Auskunft über Umweltparameter im Erfassungsbereich der Sensoreinrichtung. Diese ümweltparameter können beispielsweise Regen oder Schnee aber auch Spritzwasser, welches durch die Reifen des Kraftfahrzeugs aufgewirbelt wurde, sein.The plug contacts 49 have four pins, one of which can be used to unamplify an analog signal that is normally only available for measuring purposes and cannot be processed. This signal provides information about environmental parameters in the detection range of the sensor device. These environmental parameters can be, for example, rain or snow, but also splash water which has been whirled up by the tires of the motor vehicle.
Beinhaltet der IC 41 des Ultraschallsensors ein Verstärkungsgliedf geeignete Bandfilter zur Eliminierung von niederfrequenten Störeffekten und integriert und digitalisiert der "IC 41 das Signal, so läßt sich mit verhältnismäßig geringem Aufwand ein einfach verwendbares Signal aus dem Gehäuse 51 herausführen, das ohne Abschirmungsaufwand von der Sensoreinrichtung 10 in den Fahrzeugstoßstangen in die Steuereinrichtung 32 geleitet werden kann. In den Figuren 3a und 3b ist das Signal, welches an den Steckerpins 49 abgegriffen wird, für zwei verschiedene Situationen dargestellt.Includes the IC 41 of the ultrasonic sensor a reinforcing member for appropriate band-pass filter for eliminating low-frequency interference effects and integrated and 41 digitizes the "IC signal, so an easy usable signal from the housing 51 can be pulled out with relatively little effort, which without shielding effort from the sensor means 10 can be directed into the control device 32 in the vehicle bumpers. FIGS. 3a and 3b show the signal which is tapped at the connector pins 49 for two different situations.
Figur 3a zeigt das Signal eines Ultraschallsensors über der Zeit bei Regen, welches von vielen einzelnen Nadelpeaks geprägt ist. Figur 3b zeigt das gleiche Signal für Nieselregen/Gischt, welches über einem Rauschen nur wenige einzelne Nadelpeaks aufweist.Figure 3a shows the signal of an ultrasonic sensor over time in the rain, which is characterized by many individual needle peaks. Figure 3b shows the same signal for drizzle / spray, which has only a few individual needle peaks above a noise.
Die Steuereinrichtung 32 kann darüber hinaus noch mit weiteren Fahrzustandsinformationsgebern 53 verbunden sein, welche Informationen über den Fahrzustand, beispielsweise die Umgebungstemperatur, insbesondere als Maß für dieThe control device 32 can also be connected to other driving status information transmitters 53, which provide information about the driving status, for example the ambient temperature, in particular as a measure of the
Verdunstungsrate, die Fahrgeschwindigkeit oder ähnliches an die Steuereinrichtung 32 abgeben. DieseEvaporation rate, the driving speed or the like to the control device 32. This
Fahrzustandsinformationen werden von der Steuereinrichtung 32 zur Steuerung der Reinigungseinrichtung 34 mit herangezogen.Driving state information is also used by the control device 32 to control the cleaning device 34.
Idealerweise berechnet die Steuereinrichtung 32 in Abhängigkeit des Amplitudenspektrums des Signals der Sensoreinrichtung 10, der Intensität des Signals und der Fahrzeuggeschwindigkeit die Wassermenge, die auf die Scheibe des Fahrzeugs gelangen wird, fahrzeugspezifisch.Ideally, the control device 32 calculates, depending on the amplitude spectrum of the signal from the sensor device 10, the intensity of the signal and the vehicle speed, the amount of water that will get onto the window of the vehicle, specific to the vehicle.
Generell ist die Berücksichtigung derGenerally, the consideration of the
Fahrzeuggeschwindigkeit zur Abschätzung der Benetzung der Scheibe von besonderer Bedeutung. Die Menge desVehicle speed of particular importance for estimating the wetting of the window. The amount of
Tropfenniederschlages nimmt auf der Heckscheibe des Fahrzeugs mit steigender Tropfengröße zu.Drip precipitation increases on the rear window of the vehicle with increasing droplet size.
Bei sehr tiefen Temperaturen, wenn beispielsweise Schnee oder Eis aufgewirbelt werden, ist unter Umständen kein Wischen notwendig obwohl die Sensoreinrichtung 10. entsprechende Signale abgibt.At very low temperatures, for example when snow or ice is blown up, there may be none Wiping necessary even though the sensor device 10 emits corresponding signals.
Weiters ist es möglich eine Schwallerkennung in die Steuereinrichtung zu integrieren, um plötzlich auftretende Wasserschwälle, beispielsweise eines vorbeifahrenden Lastkraftwagens, zu erkennen, bevor diese die Scheibe des Fahrzeugs erreichen. Dazu können seitlich am Fahrzeug weitere Ultraschallsensoren angeordnet werden. Furthermore, it is possible to integrate a surge detection in the control device in order to recognize suddenly occurring surge of water, for example of a truck driving past, before they reach the window of the vehicle. For this purpose, additional ultrasonic sensors can be arranged on the side of the vehicle.

Claims

Ansprüche Expectations
1. Vorrichtung zum automatischen Reinigen von Scheiben, insbesondere der Heckscheibe eines Kraftfahrzeugs, umfassend: - eine Reinigungseinrichtung (34) - eine die Reinigungseinrichtung (34) steuernde1. Device for automatically cleaning windows, in particular the rear window of a motor vehicle, comprising: - a cleaning device (34) - a cleaning device (34) controlling
Steuereinrichtung (32)Control device (32)
dadurch gekennzeichne , daßcharacterized in that
- eine Sensoreinrichtung (10) vorgesehen ist, die mit der- A sensor device (10) is provided, which with the
Steuereinrichtung (32) zur Steuerung der Reinigungseinrichtung (34) verbunden ist und Signale abzugeben vermag, die von den Abständen zwischen ihr und anderen festen, insbesondere ruhenden Gegenständen in ihrem Erfassungsbereich und von Umweltparametern abhängig sind.Control device (32) for controlling the cleaning device (34) is connected and is capable of emitting signals which are dependent on the distances between it and other fixed, in particular stationary objects in its detection area and on environmental parameters.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Sensoreinrichtung (10) als Ultraschallsensor ausgebildet ist.2. Device according to claim 1, characterized in that the sensor device (10) is designed as an ultrasonic sensor.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Ultraschallsensor (10) Teil eines Parkpilotsystems ist.3. Apparatus according to claim 2, characterized in that the ultrasonic sensor (10) is part of a parking pilot system.
4. Vorrichtung nach einem oder mehreren der vorhergehenden4. Device according to one or more of the preceding
Ansprüche, dadurch gekennzeichnet, daß die Steuereinrichtung (32) zur Steuerung der Reinigungsvorrichtung (34) mit weiteren Fahrzustandsinformationsgebern (56) verbunden ist.Claims, characterized in that the control device (32) for controlling the cleaning device (34) is connected to further driving state information transmitters (56).
5. Vorrichtung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Steuereinrichtung5. The device according to one or more of the preceding claims, characterized in that the control device
(32) mit einem Frontscheiben-Regensensor verbunden ist und die Reinigungseinrichtung (34) in Abhängigkeit von dessen Signalen steuert.(32) is connected to a windshield rain sensor and controls the cleaning device (34) as a function of its signals.
6. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Steuereinrichtung (32) Signale der FahrZeuggeschwindigkeit, der Getriebestellung des Fahrzeugs sowie der Umgebungstemperatur als Fahrzustandsinformationen berücksichtigt.6. The device according to claim 4, characterized in that the control device (32) takes into account signals of the vehicle speed, the gear position of the vehicle and the ambient temperature as driving state information.
7. Vorrichtung nach einem oder mehreren der vorhergehenden7. Device according to one or more of the preceding
Ansprüche, dadurch gekennzeichnet, daß die Sensoreinrichtung (10) eine integrierte Signalaufbereitung, insbesondere Signalverstärkung und/oder Filterung zur Erkennung der Umweltparameter, insbesondere Spritzwasser aufweist.Claims, characterized in that the sensor device (10) has integrated signal processing, in particular signal amplification and / or filtering, for recognizing the environmental parameters, in particular spray water.
8. Vorrichtung nach einem oder mehreren der vorhergehenden8. Device according to one or more of the preceding
Ansprüche, dadurch gekennzeichnet, daß dieClaims, characterized in that the
Reinigungseinrichtung (34) als Wisch-Wasch Anlage ausgebildet ist.Cleaning device (34) is designed as a wipe-wash system.
9. Verfahren zur Steuererung einer Reinigungseinrichtung (34), insbesondere zum Reinigen der Scheiben eines Kraftfahrzeugs, mit mindestens folgenden Schritten: - Abgeben wenigstens eines niederschlagsabhängigen Signals durch einen Ultraschallsensor (10) ,9. A method for controlling a cleaning device (34), in particular for cleaning the windows of a motor vehicle, with at least the following steps: - emitting at least one precipitation-dependent signal by an ultrasonic sensor (10),
- Verarbeiten des Signals über ein vorgegebenes Zeitintervall- Processing the signal over a predetermined time interval
- Vergleichen des verarbeiteten Signals mit wenigstens einer Schwelle - Auslösen eines Arbeitssignals an die Reinigungseinrichtung- Compare the processed signal with at least one threshold - Triggering a work signal to the cleaning device
(34) bei über-/unterschreiten mindestens einer der wenigstens einen Schwelle. (34) if at least one of the at least one threshold is exceeded / fallen below.
EP01989378A 2001-01-10 2001-12-06 Device for automatically cleaning windows Withdrawn EP1361972A1 (en)

Applications Claiming Priority (3)

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DE10100732 2001-01-10
DE10100732A DE10100732A1 (en) 2001-01-10 2001-01-10 Device for automatically cleaning windows
PCT/DE2001/004603 WO2002055352A1 (en) 2001-01-10 2001-12-06 Device for automatically cleaning windows

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JP2004523409A (en) 2004-08-05

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