EP0112498A2 - Apparatus for automatically cleaning windows - Google Patents

Apparatus for automatically cleaning windows Download PDF

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Publication number
EP0112498A2
EP0112498A2 EP83111698A EP83111698A EP0112498A2 EP 0112498 A2 EP0112498 A2 EP 0112498A2 EP 83111698 A EP83111698 A EP 83111698A EP 83111698 A EP83111698 A EP 83111698A EP 0112498 A2 EP0112498 A2 EP 0112498A2
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EP
European Patent Office
Prior art keywords
window
receiver
light
transmitter
arrangement according
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.)
Granted
Application number
EP83111698A
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German (de)
French (fr)
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EP0112498B1 (en
EP0112498A3 (en
Inventor
Folke Löfgren
Sven-Erik Söderström
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ABB Norden Holding AB
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ASEA AB
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Publication of EP0112498A2 publication Critical patent/EP0112498A2/en
Publication of EP0112498A3 publication Critical patent/EP0112498A3/en
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Publication of EP0112498B1 publication Critical patent/EP0112498B1/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L1/00—Cleaning windows

Definitions

  • the invention relates to an arrangement for the automatic cleaning of windows according to the preamble of claim 1.
  • cloud height and visual measuring devices as well as certain types of distance measuring devices, all of which operate on the principle of optical radar, which means that short light pulses are emitted by a transmitter.
  • optical radar which means that short light pulses are emitted by a transmitter.
  • the receiver of the measuring device When the light pulse hits a cloud or some other reflective object, reflections occur on that object and a small part of the reflected light is collected by the receiver of the measuring device, which is arranged next to the transmitter. The time it takes for the light to travel the distance from the transmitter to the reflecting object and from this back to the receiver is measured, and from this the cloud height or the line of sight or the distance can be calculated based on the known speed of light.
  • Transmitter and receiver are built into a so-called transceiver, which also contains the optics and the necessary electronic equipment.
  • the emitted light passes through a transmitter window and the reflected light passes through a receiver window before it reaches a signal detector via the receiver optics.
  • window wipers with wiper blades such as those used for cleaning headlights and windows in cars, cannot be used, and also not in conjunction with a washing liquid, since they press relatively strongly against the glass.
  • the signals detected by the signal detector are greatly reduced by precipitation in the form of rain and snow on the windows.
  • the signals detected by the signal detector are greatly reduced by precipitation in the form of rain and snow on the windows.
  • This cleaning must be carried out continuously during the entire period of precipitation in order to keep the windows sufficiently clean.
  • the invention has for its object to develop an arrangement of the type mentioned, which ensures reliable and convenient way for an automatic cleaning of windows, and which is particularly suitable for keeping the windows of cloud height and visual measuring devices clean.
  • the degree of soiling of the windows is continuously monitored, and as soon as a certain soiling limit is exceeded, a cleaning device is started that removes water and dirt from the window.
  • the arrangement is designed so that there are no scratches on the window surfaces. When the windows are clean are or a sufficient degree of cleanliness has been reached, the cleaning device is stopped.
  • the arrangement according to the. Invention is designed so that it does not affect the normal course of operation of a cloud height or visual measuring device.
  • the window glass used in measuring devices in which measuring radiation passes through the glass is normally treated with anti-reflection in order not to cause greater attenuation of the light signals itself.
  • the arrangement according to the invention uses the light reflected in this way as information that a foreign layer, for example rain or snow, is on the outside of the window.
  • the logic unit of the cloud height measuring device processes the measured reflection values, and if the measured reflection signal exceeds a certain value, a cleaning device is activated.
  • the cleaning device can operate by blowing high pressure air along the window.
  • Another possibility is to use a swinging or rotating drying arm that is close to the glass surface lies, has an open gap or a row of holes directed towards the glass, compressed air and / or a rinsing liquid being fed through the hollow drying arm in such a way that a film or a veil of compressed air and / or liquid forms between the drying arm and the glass and slides over the glass.
  • the cleaning sequence can be controlled in such a way that rinsing and then drying by blowing with heated high-pressure air are carried out lengthways along the window. If the measured value for the light reflected on the surface of the glass becomes zero or falls below a low comparison value, the cleaning device is stopped.
  • the measuring device shown equally in FIGS. 1 and 2 for measuring the cloud height, visibility or a distance comprises parts 1 to 9.
  • the measuring device works on the principle of optical radar.
  • the transmitter part includes the transmitter 1, the transmitter optics 2 and the transmitter window 3.
  • the receiver part includes the receiver window 4, the receiver optics 5, the receiver 6 and the signal detector 7.
  • the processor 8 contains the electronic equipment which, among other things, activates the laser transmitter and the Measurement course controls, counts the pulses and transmits data 9 to be written and / or displayed devices.
  • the cleaning arrangement according to the invention includes a light guide 10 and a feed element 11 for the cleaning device 12. Otherwise, the cleaning arrangement uses the transmitter and receiver units already present in the measuring device.
  • the cleaning arrangement according to FIG. 2 contains its own transmitter 13 with feed element 14 and its own receiver 15 with signal detector 16 as well as the cleaning device 18 with feed element 17, via which the cleaning device is switched on.
  • Both embodiments of the invention work on the same principle.
  • the foreign layer (dirt, snow, rain) on the outside of the transmitter window is detected by measuring the radiation reflected by this layer. Since the spatial distance between the transmitter window and the receiver window is small, it can be assumed that the foreign layer is the same on both windows. In principle, there can also be a common window for the transmitter and receiver.
  • the radiation reflected by the foreign layer e.g. water drops
  • the radiation reflected by the foreign layer e.g. water drops
  • the transmitter and receiver of the measuring device itself are used to detect a possible foreign layer.
  • the light reflected from the outside of the transmitter window 3 is collected and passed directly to the receiver 6 via the light guide 10.
  • a special measurement sequence is programmed in the processor 8 for this reflection measurement, and the corresponding reflected signal is processed by the processor.
  • the reflection measurement for detecting the foreign layer is controlled by the processor so that it is either before or after a cloud height or visibility measurement done so as not to disturb the latter.
  • the value of the measured reflected light is compared in processor 8 with a predetermined comparison value which corresponds to the maximum permissible contamination of the transmitter window. If the comparison value is exceeded, the processor 8 sends a signal to the feed element 11 which sets the cleaning device 12 in motion.
  • the cleaning arrangement has its own transmitter 13 with its own feed element 14 for illuminating the transmitter window 3 and its own receptions @ Xit detector 16 for measuring the light reflected from the transmitter window.
  • the processor 8 takes on the same function in this cleaning arrangement as in FIG. 1. It therefore controls the transmitter 13 and receiver 15, converts the reflected light into a measured value for the degree of soiling of the window, compares this value with a predetermined comparison value which is the highest permissible pollution corresponds, and activates the feed member 17 of the cleaning device 18 when the measured value exceeds the comparison value.
  • the cleaning devices 12 and 18 in FIG. 1 and FIG. 2 are the same device, but, as already mentioned, can be designed in different ways.
  • the device can be a high-pressure unit which blows heated air along windows 3 and 4.
  • an additional cleaning device can be used to achieve a better cleaning effect.
  • the supplement can consist of a back-and-forth or rotating wiper blade with a soft contact edge on the outside of the transmitter window.
  • the cleaning process can be programmed, for example, in such a way that first rinsing and then drying by blowing with heated compressed air takes place.
  • the cleaning device is automatically stopped after the window has been cleaned, i.e. as soon as no or only a small amount of light is reflected on the outside of the window.
  • the measurement can of course be carried out on the transmitter and receiver window or only on one of the windows. If the measurement is carried out on the receiver window, a light guide is used in the embodiment according to FIG. 1, which transmits light from the transmitter for illuminating the receiver window.
  • the embodiment according to FIG. 2 can be used for the receiver window in the same way as for the transmitter window. It is also possible to work only with a separate transmitter 13 and, for example, the own receiver 6 of the cloud height measuring device, the receiver 6 collecting the reflections caused by the foreign layer on the window glass. If disturbing reflections from the foreign layer measurement on the glass can occur or if the cloud height measuring system of the cloud height measuring device is used, the measurement of the Foreign window layer are made in such a way that the cloud height or visibility measurement is not disturbed.

Abstract

1. Arrangement for automatically cleaning of windows on which an external coating of dirt, water, snow or the like may occur, particularly of windows adapted for the penetration of a measuring radiation, characterized in that a transmitter (13) is provided for emitting light on the surface of the window to be cleaned, that a receiver (15, 16) is provided for receiving the light reflected from the external coating on the window (3), and that their is a unit adapted to compare the measuring value for the reflected light supplied from the receiver (15, 16) with a preset value and to deliver a signal when the preset value is exceeded which signal starts the cleaning device (18) for the window.

Description

Die Erfindung betrifft eine Anordnung zur selbsttätigen Reinigung von Fenstern gemäß dem Oberbegriff des Anspruches 1.The invention relates to an arrangement for the automatic cleaning of windows according to the preamble of claim 1.

Ein wichtiges Anwendungsgebiet für eine solche Anordnung sind Wolkenhöhen- und Sichtmeßgeräte sowie bestimmte Arten von Abstandsmeßgeräten, die alle nach dem Prinzip des optischen Radars arbeiten, was bedeutet, daß kurze Lichtimpulse von einem Sender ausgesandt werden. Wenn der Lichtimpuls eine Wolke oder irgendeinen anderen reflektierenden Gegenstand trifft, treten an diesem Gegenstand Reflexionen auf, und ein kleiner Teil des reflektierten Lichtes wird von dem Empfänger des Meßgerätes, der neben dem Sender angeordnet ist, aufgefangen. Die Zeit, die das Licht für das Durchlaufen der Strecke vom Sender zum reflektierenden Gegenstand und von diesem zurück zum Empfänger braucht, wird gemessen, und hieraus läßt sich aufgrund der bekannten Lichtgeschwindigkeit die Wolkenhöhe bzw. die Sichtstrecke oder der Abstand berechnen.An important area of application for such an arrangement is cloud height and visual measuring devices as well as certain types of distance measuring devices, all of which operate on the principle of optical radar, which means that short light pulses are emitted by a transmitter. When the light pulse hits a cloud or some other reflective object, reflections occur on that object and a small part of the reflected light is collected by the receiver of the measuring device, which is arranged next to the transmitter. The time it takes for the light to travel the distance from the transmitter to the reflecting object and from this back to the receiver is measured, and from this the cloud height or the line of sight or the distance can be calculated based on the known speed of light.

Sender und Empfänger sind in einen sog. Sendeempfänger (transceiver) eingebaut, der auch die Optik und die erforderliche elektronische Ausrüstung enthält. Das ausgesandte Licht passiert ein Senderfenster, und das reflektierte Licht passiert ein Empfängerfenster, bevor es über die Empfängeroptik zu einem Signaldetektor gelangt.Transmitter and receiver are built into a so-called transceiver, which also contains the optics and the necessary electronic equipment. The emitted light passes through a transmitter window and the reflected light passes through a receiver window before it reaches a signal detector via the receiver optics.

Es ist sehr wichtig, daß die genannten Fenster des Sendeempfängers nicht durch eine Fremdschicht aus Schmutz, Regen, Schnee o. dgl. verunreinigt sind, da diese Schicht den Durchtritt der Lichtsignale erschweren würde. Bisher wurden diese Fenster manuell gereinigt. Dabei werden gewisse Reinigungsintervalle eingehalten, die - je nach den örtlichen Verhältnissen - von einer Woche bis zu einem Monat variieren können.It is very important that the windows of the transceiver mentioned are not contaminated by a foreign layer of dirt, rain, snow or the like, since this layer would make it difficult for the light signals to pass through. So far, these windows have been cleaned manually. Certain cleaning intervals are observed, which - depending on the local conditions - can vary from one week to one month.

Es hat sich gezeigt, daß eine Fremdschicht aus beispielsweise Wassertropfen auf den Fenstern eine Dämpfung des am Signaldetektor eintreffenden reflektierten Lichtes von etwa einem Viertel bis einem Sechstel verursachen kann im Vergleich zu sauberen Fenstern. Da das erfaßbare reflektier6-te Licht ohnehin nur ein sehr kleiner Teil des ausgesandten Lichtimpulses ist, hat die weitere Reduzierung der empfangenen Signalstärke durch eine Fremdschicht auf den Fenstern eine unsichere Messung zur Folge. Die an die Signaldetektoren zu stellenden hohen Ansprüche werden dadurch noch weiter vergrößert.It has been shown that a foreign layer of, for example, water drops on the windows can cause the reflected light arriving at the signal detector to be attenuated by about a quarter to a sixth compared to clean windows. Since the detectable reflected light is only a very small part of the emitted light pulse, the further reduction in the signal strength received due to an external layer on the windows results in an uncertain measurement. This further increases the high demands placed on the signal detectors.

Eine Reinigung der Fenstergläser darf möglichst keine Kratzer verursachen, da diese unerwünschte Reflektionen und eine unerwünschte Ausbreitung des Lichtsignals zur Folge haben. Aus diesem Grunde können Fensterwischer mit Wischerblättern, wie sie beispielsweise zur Reinigung von Scheinwerfern und Fenstern von Autos verwendet werden, nicht verwendet werden, und zwar auch nicht in Verbindung mit einer Spülflüssigkeit, da sie verhältnismäßig stark gegen das Glas andrücken.Cleaning the window glasses should not cause any scratches as possible, as these result in undesired reflections and an undesired propagation of the light signal. For this reason, window wipers with wiper blades, such as those used for cleaning headlights and windows in cars, cannot be used, and also not in conjunction with a washing liquid, since they press relatively strongly against the glass.

Insbesondere bei Wolkenhöhenmeßgeräten, bei welchen die Fensterflächen in der horizontalen Ebene liegen, werden die vom Signaldetektor erfaßten Signale durch Niederschlag in Form von Regen und Schnee auf den Fenstern stark reduziert. Bei der bisher bekannten Art der Reinigung ergibt sich hierbei auch die Unannehmlichkeit, daß gerade bei schlechtem Wetter die Notwendigkeit besteht, zum Sendeempfänger zu gehen, um die Fenster zu reinigen. Diese Reinigung muß während der gesamten Dauer eines Niederschlags fortlaufend durchgeführt werden, um die Fenster ausreichend sauber zu halten.Particularly in the case of cloud height measuring devices in which the window surfaces lie in the horizontal plane, the signals detected by the signal detector are greatly reduced by precipitation in the form of rain and snow on the windows. With the previously known type of cleaning results there is also the inconvenience that, especially in bad weather, there is a need to go to the transceiver to clean the windows. This cleaning must be carried out continuously during the entire period of precipitation in order to keep the windows sufficiently clean.

Da das Herabfallen von Schmutz und anderen Substanzen zeitlich völlig unregelmäßig erfolgt, ist die häufig empfohlene Reinigung in periodischen Abständen keine Garantie dafür, daß die durch eine Fremdschicht auf den Fenstern verursachte Dämpfung ausreichend klein bleibt.Since dirt and other substances fall at irregular intervals, the frequently recommended cleaning at regular intervals is no guarantee that the damping caused by a foreign layer on the windows will remain sufficiently small.

Der Erfindung liegt die Aufgabe zugrunde, eine Anordnung der eingangs genannten Art zu entwickeln, die in zuverlässiger und bequemer Weise für eine selbsttätige Reinigung von Fenstern sorgt, und die insbesondere zur Reinhaltung der Fenster von Wolkenhöhen- und Sichtmeßgeräten geeignet ist.The invention has for its object to develop an arrangement of the type mentioned, which ensures reliable and convenient way for an automatic cleaning of windows, and which is particularly suitable for keeping the windows of cloud height and visual measuring devices clean.

Zur Lösung dieser Aufgabe wird eine Anordnung nach dem Oberbegriff des Anspruches 1 vorgeschlagen, die erfindungsgemäß die im kennzeichnenden Teil des Anspruches 1 genannten Merkmale hat.To solve this problem, an arrangement according to the preamble of claim 1 is proposed, which according to the invention has the features mentioned in the characterizing part of claim 1.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen genannt.Advantageous developments of the invention are mentioned in the subclaims.

Mit einer Anordnung gemäß der Erfindung ist es möglich, die oben genannten Schwierigkeiten zu beseitigen. Der Verschmutzungsgrad der Fenster wird kontinuierlich überwacht, und sobald eine bestimmte Verschmutzungsgrenze überschritten ist, wird eine Reinigungsvorrichtung in Gang gesetzt, die Wasser und Schmutz vom Fenster entfernt. Die Anordnung ist so ausgebildet, daß keine Kratzer auf den Fensterflächen entstehen. Wenn die Fenster sauber sind oder ein ausreichender Sauberkeitsgrad erreicht worden ist, wird die Reinigungsvorrichtung stillgesetzt.With an arrangement according to the invention it is possible to overcome the above-mentioned difficulties. The degree of soiling of the windows is continuously monitored, and as soon as a certain soiling limit is exceeded, a cleaning device is started that removes water and dirt from the window. The arrangement is designed so that there are no scratches on the window surfaces. When the windows are clean are or a sufficient degree of cleanliness has been reached, the cleaning device is stopped.

Auf diese Weise wird erreicht, daß stets ein genau definiertes oberes Dämpfungsniveau und somit eine genau definierte maximal mögliche Signalschwächung durch die auf dem Glas vorhandene Fremdschicht gegeben ist. Dies hat zur Folge, daß der Signaldetektor und die übrige Elektronik besser für die eigentliche Messung genutzt werden können, wodurch die Leistung des Meßgerätes erheblich verbessert wird.In this way it is achieved that there is always a precisely defined upper attenuation level and thus a precisely defined maximum possible signal weakening by the foreign layer present on the glass. The result of this is that the signal detector and the remaining electronics can be better used for the actual measurement, which considerably improves the performance of the measuring device.

Die Anordnung gemäß der. Erfindung ist so ausgebildet, daß sie bei einem Wolkenhöhen- oder Sichtmeßgerät dessen normalen Betriebsablauf nicht beeinflußt.The arrangement according to the. Invention is designed so that it does not affect the normal course of operation of a cloud height or visual measuring device.

Das Fensterglas, das in Meßgeräten verwendet wird, in denen eine Meßstrahlung durch das Glas tritt, ist normalerweise antireflektionsbehandelt, um nicht selbst eine größere Dämpfung der Lichtsignale zu verursachen.The window glass used in measuring devices in which measuring radiation passes through the glass is normally treated with anti-reflection in order not to cause greater attenuation of the light signals itself.

Wenn auf dem Senderfenster beispielsweise eines Wolkenhöhenmeßgerätes eine Fremdschicht aus beispielsweise Regentropfen liegt, treten an dieser Schicht Reflexionen auf. Die Anordnung gemäß der Erfindung benutzt das auf diese Weise reflektierte Licht als Information darüber, daß eine Fremdschicht, z.B. Regen oder Schnee, auf der Außenseite des Fensters liegt. Die Logikeinheit des Wolkenhöhenmeßgerätes verarbeitet die gemessenen Reflektionswerte, und wenn das gemessene Reflexionssignal einen bestimmten Wert überschreitet, wird eine Reinigungsvorrichtung aktiviert. Die Reinigungsvorrichtung kann in der Weise arbeiten, daß sie unter hohem Druck stehende Luft am Fenster entlangbläst. Eine andere Möglichkeit besteht in der Verwendung eines hin- und herschwingenden oder rotierenden Trockenarmes, der nahe an der Glasoberfläche liegt, einen auf das Glas gerichteten offenen Spalt oder eine Lochreihe hat, wobei Druckluft und/oder eine Spülflüssigkeit derart durch den hohlen Trockenarm zugeführt wird, daß sich zwischen dem Trockenarm und dem Glas ein Film oder ein Schleier aus Druckluft und/oder Flüssigkeit bildet und über das Glas hinweggleitet. Der Reinigungsablauf kann so gesteuert werden, daß zunächst eine Spülung und anschließend ein Trocknen durch Blasen mit erwärmter Hochdruckluft längs zum Fenster erfolgt. Wenn der Meßwert für das an der Oberfläche des Glases reflektierte Licht Null wird oder einen niedrigen Vergleichswert unterschreitet, wird die Reinigungsvorrichtung stillgesetzt.If there is a foreign layer of, for example, raindrops on the transmitter window of a cloud height measuring device, for example, reflections occur on this layer. The arrangement according to the invention uses the light reflected in this way as information that a foreign layer, for example rain or snow, is on the outside of the window. The logic unit of the cloud height measuring device processes the measured reflection values, and if the measured reflection signal exceeds a certain value, a cleaning device is activated. The cleaning device can operate by blowing high pressure air along the window. Another possibility is to use a swinging or rotating drying arm that is close to the glass surface lies, has an open gap or a row of holes directed towards the glass, compressed air and / or a rinsing liquid being fed through the hollow drying arm in such a way that a film or a veil of compressed air and / or liquid forms between the drying arm and the glass and slides over the glass. The cleaning sequence can be controlled in such a way that rinsing and then drying by blowing with heated high-pressure air are carried out lengthways along the window. If the measured value for the light reflected on the surface of the glass becomes zero or falls below a low comparison value, the cleaning device is stopped.

Anhand der in den Figuren gezeigten Ausführungsbeispiele soll die Erfindung näher erläutert werden. Es zeigen

  • Fig. 1 ein erstes Ausführungsbeispiel gemäß der Erfindung angewendet bei einem Meßgerät zur Messung der Wolkenhöhe oder der Sichtweite,
  • Fig. 2 ein zweites Ausführungsbeispiel einer Anordnung gemäß der Erfindung angewendet bei einem gleichen Meßgerät wie in Fig. 1.
The invention will be explained in more detail with reference to the exemplary embodiments shown in the figures. Show it
  • 1 shows a first embodiment according to the invention applied to a measuring device for measuring cloud height or visibility,
  • FIG. 2 shows a second exemplary embodiment of an arrangement according to the invention applied to the same measuring device as in FIG. 1.

Das in den Figuren 1 und 2 gleichermaßen dargestellte Meßgerät zur Messung der Wolkenhöhe, der Sichtweite oder eines Abstandes umfaßt die Teile 1 bis 9. Das Meßgerät arbeitet nach dem Prinzip des optischen Radars. Zum Senderteil gehören der Sender 1, die Sendeoptik 2 und das Senderfenster 3. Zum Empfängerteil gehören das Empfängerfenster 4, die Empfängeroptik 5, der Empfänger 6 und der Signaldetektor 7. Der Prozessor 8 enthält die elektronische Ausrüstung, die unter anderem den Lasersender aktiviert und den Meßverlauf steuert, die Impulse zählt und Daten 9 zu schreibenden und/oder anzeigenden Geräten überträgt.The measuring device shown equally in FIGS. 1 and 2 for measuring the cloud height, visibility or a distance comprises parts 1 to 9. The measuring device works on the principle of optical radar. The transmitter part includes the transmitter 1, the transmitter optics 2 and the transmitter window 3. The receiver part includes the receiver window 4, the receiver optics 5, the receiver 6 and the signal detector 7. The processor 8 contains the electronic equipment which, among other things, activates the laser transmitter and the Measurement course controls, counts the pulses and transmits data 9 to be written and / or displayed devices.

Zu der Reinigungsanordnung gemäß der Erfindung gehören in Fig. 1 ein Lichtleiter 10 und ein Speiseglied 11 für die Reinigungsvorrichtung 12. Im übrigen bedient sich die Reinigungsanordnung der im Meßgerät bereits vorhandenen Sende- und Empfängereinheiten.In FIG. 1, the cleaning arrangement according to the invention includes a light guide 10 and a feed element 11 for the cleaning device 12. Otherwise, the cleaning arrangement uses the transmitter and receiver units already present in the measuring device.

Die Reinigungsanordnung gemäß Figur 2 enthält einen eigenen Sender 13 mit Speiseglied 14 und einen eigenen Empfänger 15 mit Signaldetektor 16 sowie die Reinigungsvorrichtung 18 mit Speiseglied 17, über welches die Reinigungsvorrichtung eingeschaltet wird.The cleaning arrangement according to FIG. 2 contains its own transmitter 13 with feed element 14 and its own receiver 15 with signal detector 16 as well as the cleaning device 18 with feed element 17, via which the cleaning device is switched on.

Beide Ausführungsformen der Erfindung arbeiten nach dem gleichen Prinzip. Die auf der Außenseite des Senderfensters vorhandene Fremdschicht (Schmutz, Schnee, Regen) wird dadurch erfaßt, daß die von dieser Schicht reflektierte Strahlung gemessen wird. Da der räumliche Abstand zwischen Senderfenster und Empfängerfenster klein ist, kann davon ausgegangen werden, da3 die Fremdschicht auf beiden Fenstern gleich ist. Im Prinzip kann auch ein gemeinsames Fenster für den Sender und Empfänger vorhanden sein. Die von der Fremdschicht (z.B. Wassertropfen) auf der Außenseite des Fensters reflektierte Strahlung wird auf den Empfänger geleitet und steuert die Einschaltung des Reinigungsaggregats 12 bzw. 17.Both embodiments of the invention work on the same principle. The foreign layer (dirt, snow, rain) on the outside of the transmitter window is detected by measuring the radiation reflected by this layer. Since the spatial distance between the transmitter window and the receiver window is small, it can be assumed that the foreign layer is the same on both windows. In principle, there can also be a common window for the transmitter and receiver. The radiation reflected by the foreign layer (e.g. water drops) on the outside of the window is directed to the receiver and controls the activation of the cleaning unit 12 or 17.

Bei der in Figur 1 gezeigten Ausführungsform werden Sender und Empfänger des Meßgerätes selbst genutzt, um eine eventuelle Fremdschicht zu erkennen. Das von der Außenseite des Senderfensters 3 reflektierte Licht wird gesammelt und über den Lichtleiter 10 direkt zum Empfänger 6 geleitet. Im Prozessor 8 ist für diese Reflexionsmessung eine besondere Meßfolge programmiert, und das entsprechende reflektierte Signal wird von dem Prozessor verarbeitet. Die Reflexionsmessung zur Erfassung der Fremdschicht wird vom Prozessor so gesteuert, daß sie entweder vor oder nach einer Wolkenhöhen- oder Sichtmessung erfolgt, um die letztere nicht zu stören. Der Wert des gemessenen reflektierten Lichtes wird im Prozessor 8 mit einem vorgegebenen Vergleichswert verglichen, der der maximal zulässigen Verschmutzung des Senderfensters entspricht. Wird der Vergleichswert überschritten, so geht vom Prozessor 8 ein Signal an das Speiseglied 11, welches die Reinigungsvorrichtung 12 in Gang setzt.In the embodiment shown in FIG. 1, the transmitter and receiver of the measuring device itself are used to detect a possible foreign layer. The light reflected from the outside of the transmitter window 3 is collected and passed directly to the receiver 6 via the light guide 10. A special measurement sequence is programmed in the processor 8 for this reflection measurement, and the corresponding reflected signal is processed by the processor. The reflection measurement for detecting the foreign layer is controlled by the processor so that it is either before or after a cloud height or visibility measurement done so as not to disturb the latter. The value of the measured reflected light is compared in processor 8 with a predetermined comparison value which corresponds to the maximum permissible contamination of the transmitter window. If the comparison value is exceeded, the processor 8 sends a signal to the feed element 11 which sets the cleaning device 12 in motion.

In der Ausführungsform nach Figur 2 gehört zur Reinigungsanordnung ein eigener Sender 13 mit einem eigenen Speiseglied 14 für die Beleuchtung des Senderfensters 3 sowie ein eigener Empfänge@Xit Detektor 16 zur Messung des vom Senderfenster reflektierten Lichtes. Der Prozessor 8 übernimmt in dieser Reinigungsanordnung die gleiche Funktion wie in Figur 1. Er steuert also den Sender 13 und Empfänger 15, wandelt das reflektierte Licht in einen Meßwert für den Verschmutzungsgrad des Fensters um, vergleicht diesen Wert mit einem vorgegebenen Vergleichswert, der der höchst zulässigen Verschmutzung entspricht, und aktiviert das Speiseglied 17 der Reinigungsvorrichtung 18, wenn der Meßwert den Vergleichswert überschreitet.In the embodiment according to FIG. 2, the cleaning arrangement has its own transmitter 13 with its own feed element 14 for illuminating the transmitter window 3 and its own receptions @ Xit detector 16 for measuring the light reflected from the transmitter window. The processor 8 takes on the same function in this cleaning arrangement as in FIG. 1. It therefore controls the transmitter 13 and receiver 15, converts the reflected light into a measured value for the degree of soiling of the window, compares this value with a predetermined comparison value which is the highest permissible pollution corresponds, and activates the feed member 17 of the cleaning device 18 when the measured value exceeds the comparison value.

Bei den Reinigungsvorrichtungen 12 und 18 in Figur 1 bzw. Figur 2 handelt es sich um dieselbe Vorrichtung, die jedoch, wie bereits erwähnt, in verschiedener Weise ausgebildet sein kann. In ihrer einfachsten Form kann die Vorrichtung ein Hochdruckaggregat sein, welches erwärmte Luft an den Fenstern 3 und 4 entlangbläst. In Gebieten mit starker Luftverunreinigung, z.B. Industriegebieten, wo mit einer starken Verschmutzung der Fenstergläser zu rechnen ist, kann zur Erzielung einer besseren Reinigungswirkung eine ergänzte Reinigungsvorrichtung verwendet werden. Die Ergänzung kann aus einem hin- und herschwingenden oder rotierenden Wischerblatt mit weicher Anlagekante an der Außenseite des Senderfensters bestehen. Wegen der hierbei auftretenden Kratzgefahr ist es zweckmäßig, den weichen Teil des Wischerblattes durch einen Trockenarm zu ersetzen, der einen auf das Glas gerichteten offenen Spalt oder eine Lochreihe hat, durch den/die Druckluft oder Spülflüssigkeit zugeführt wird, so daß sich ein Film aus Druckluft oder Flüssigkeit zwischen dem Fensterglas und dem nahe über dem Glas sich bewegenden Trockenarm ausbildet. Der Reinigungsvorgang kann beispielsweise in der Art programmiert werden, daß zunächst ein Spülen und anschließend ein Trocknen durch das Beblasen mit erwärmter Druckluft stattfindet.The cleaning devices 12 and 18 in FIG. 1 and FIG. 2 are the same device, but, as already mentioned, can be designed in different ways. In its simplest form, the device can be a high-pressure unit which blows heated air along windows 3 and 4. In areas with strong air pollution, for example industrial areas, where heavy contamination of the window glasses is to be expected, an additional cleaning device can be used to achieve a better cleaning effect. The supplement can consist of a back-and-forth or rotating wiper blade with a soft contact edge on the outside of the transmitter window. Because of the risk of scratching, it is advisable to replace the soft part of the wiper blade with a drying arm, which has an open gap or a row of holes directed at the glass, through which / the compressed air or flushing liquid is supplied, so that a film of compressed air or liquid between the window glass and the close above the drying arm is moving. The cleaning process can be programmed, for example, in such a way that first rinsing and then drying by blowing with heated compressed air takes place.

Bei beiden Ausführungsformen wird die Reinigungsvorrichtung automatisch stillgesetzt, nachdem das Fenster gereinigt worden ist, d.h., sobald kein oder-nur eine geringe Menge von Licht an der Außenseite des Fensters reflektiert wird.In both embodiments, the cleaning device is automatically stopped after the window has been cleaned, i.e. as soon as no or only a small amount of light is reflected on the outside of the window.

Eine Anordnung nach der Erfindung ist nicht auf die gezeigten beiden Ausführungsformen beschränkt, sondern kann im Rahmen des offenbarten Erfindungsgedankens in vielfacher Weise variiert werden.An arrangement according to the invention is not limited to the two embodiments shown, but can be varied in many ways within the scope of the disclosed inventive concept.

Die Messung kann natürlich sowohl am Sender- und Empfängerfenster vorgenommen werden oder nur an einem der Fenster. Wird die Messung am Empfängerfenster durchgeführt, so wird bei der Ausführung nach Figur 1 ein Lichtleiter verwendet, der Licht vom Sender zur Beleuchtung des Empfängerfensters überträgt. Die Ausführungsform gemäß Figur 2 kann für das Empfängerfenster in gleicher Weise wie für das Senderfenster verwendet werden. Es kann auch nur mit einem separaten Sender 13 und beispielsweise dem eigenen Empfänger 6 des Wolkenhöhenmeßgerätes gearbeitet werden, wobei der Empfänger 6 die durch die Femdschicht auf dem Fensterglas bedingten Reflexionen auffängt. Wenn störende Reflexionen von der Fremdschichtmessung auf dem Glas auftreten können oder wenn das Wolkenhöhenmeßsystem des Wolkenhöhenmeßgeräts benutzt wird, muß das Messen der Fensterfremdschicht auf solche Weise vorgenommen werden, daß die Wolkenhöhen- oder Sichtmessung nicht gestört wird.The measurement can of course be carried out on the transmitter and receiver window or only on one of the windows. If the measurement is carried out on the receiver window, a light guide is used in the embodiment according to FIG. 1, which transmits light from the transmitter for illuminating the receiver window. The embodiment according to FIG. 2 can be used for the receiver window in the same way as for the transmitter window. It is also possible to work only with a separate transmitter 13 and, for example, the own receiver 6 of the cloud height measuring device, the receiver 6 collecting the reflections caused by the foreign layer on the window glass. If disturbing reflections from the foreign layer measurement on the glass can occur or if the cloud height measuring system of the cloud height measuring device is used, the measurement of the Foreign window layer are made in such a way that the cloud height or visibility measurement is not disturbed.

Claims (10)

1. Anordnung zur selbsttätigen Reinigung von Fenstern, auf denen sich eine Fremdschicht aus Schmutz, Wasser, Schnee o. dgl. ablagern kann, insbesondere von Fenstern zum Durchtritt einer Meßstrahlung, dadurch gekennzeichnet, daß ein Sender (13)zum Aussenden von Licht auf die Fläche des zu reinigenden Fensters vorhanden ist daß ein Empfändes ger (15, 16) zum Empfang/von der Fremdschicht auf dem Fenster (3) reflektierten Lichtes vorhanden ist, und daß ein Glied vorhanden ist, welches den vom Empfänger (15, 16) gelieferten Meßwert für das reflektierte Licht mit einem vorgegebenen Vergleichswert vergleicht und beim Überschreiten des Vergleichswertes ein Signal erzeugt, welches die Reinigungsvorrichtung (18) für das Fenster in Gang setzt.1. Arrangement for the automatic cleaning of windows on which a foreign layer of dirt, water, snow or the like can be deposited, in particular windows for the passage of measuring radiation, characterized in that a transmitter (13) for emitting light on the Surface of the window to be cleaned is present that a receiver ger (15, 16) for receiving / from the foreign layer on the window (3) reflected light is present, and that there is a link which is supplied by the receiver (15, 16) Compares the measured value for the reflected light with a predetermined comparison value and, when the comparison value is exceeded, generates a signal which sets the cleaning device (18) in motion for the window. 2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß das genannte Glied zur Verarbeitung des Meßsignals vom Empfänger (15, 16) ein Stoppsignal an die Reinigungsvorrichtung liefert, wenn der Meßwert für das reflektierte Licht unter einen bestimmten Vergleichswert sinkt.2. Arrangement according to claim 1, characterized in that said member for processing the measurement signal from the receiver (15, 16) delivers a stop signal to the cleaning device when the measurement value for the reflected light falls below a certain comparison value. 3. Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die zu reinigenden Fenster(3, 4) zu dem Sender-und/oder Empfänger eines Wolkenhöhen- oder Sichtweitenmeßgerätes gehören, welches nach dem Prinzip des optischen Radars arbeitet, und daß das genannte Glied zur Verarbeitung des Meßsignals vom Empfänger (15, 16) in der Steuer- und Recheneinheit (8) des Wolkenhöhenmeßgerätes integriert ist, welche die Zusammenwirkung zwischen Lichtemittierung und Lichterfassung für die normale Wolken- oder Sichtmessung einerseits und für die Lichtemittierung und Lichterfassung zur Erkennung der Fremdschicht auf dem Fenster andererseits derart steuert, daß die letztgenannte Lichtemittierung und Lichterfassung als eine spezielle Meßsequenz während des normalen Betriebes zur Messung der Wolkenhöhe oder Sichtweite erfolgt.3. Arrangement according to claim 1 or 2, characterized in that the windows to be cleaned (3, 4) belong to the transmitter and / or receiver of a cloud height or visibility measuring device, which works on the principle of optical radar, and that the said Link for processing the measurement signal from the receiver (15, 16) in the control and computing unit (8) of the cloud height measuring device is integrated, which the interaction between light emitting and light detection for normal cloud or visibility measurement on the one hand and for light emitting and light detection to detect the Foreign layer on the other hand controls such that the latter light emitting and light detection takes place as a special measuring sequence during normal operation for measuring the cloud height or visibility. 4. Anordnung nach Anspruch 3, dadurch gekennzeichnet, daß als Sender für das Licht zur Erfassung der Fremdschicht auf dem Fenster der Sender(1)des Wolkenhöhen-oder Sichtweitenmeßgerätes dient und/oder als Empfänger für das von der Fremdschicht des Fensters reflektierten Lichtes der Empfänger (6, 7) des Wolkenhöhen- oder Sichtweitenmeßgerätes dient.4. Arrangement according to claim 3, characterized in that serves as a transmitter for the light for detecting the foreign layer on the window of the transmitter (1) of the cloud height or visibility measuring device and / or as a receiver for the light reflected from the foreign layer of the window of the receiver (6, 7) of the cloud height or visibility measuring device is used. 5. Anordnung nach einem dervorhergehenden Ansprüche, dadurch gekennzeichnet, daß zur Übertragung des der Messung der Fremdschicht dienenden Lichtes vom Sender zum Fenster und/oder vom Fenster zum Empfänger optische Lichtleiter (10) vorhanden sind, die mit einer optischen Linse versehen sein können.5. Arrangement according to one of the preceding claims, characterized in that for the transmission of the measurement of the foreign layer light serving from the transmitter to the window and / or from the window to the receiver, optical light guides (10) are present, which can be provided with an optical lens. 6. Anordnung nach Anspruch 3, dadurch gekennzeichnet, daß der separate Sender (13) zur Messung der Fremdschicht auf das Empfängerfenster (4) gerichtet ist und daß der Empfänger (6, 7) des Wolkenhöhen- oder Sichtmessers dazu vorgesehen ist, auch das von der Fremdschicht auf dem Empfängerfenster reflektierte Licht zu erfassen.6. Arrangement according to claim 3, characterized in that the separate transmitter (13) is directed to the measurement of the foreign layer on the receiver window (4) and that the receiver (6, 7) of the cloud height or sight meter is provided, also by to detect light reflected from the foreign layer on the receiver window. 7. Anordnung nach Anspruch 3, dadurch gekennzeichnet, daß der Sender (1) des Wolkenhöhen- oder Sichtweitenmeßgeräts dazu vorgesehen ist, Licht zur Erfassung der Fremdschicht auf das Fenster (3) des Senders zu senden und daß der separat angeordnete Empfänger (15, 16) das vom Senderfenster an der Fremdschicht reflektierte Licht erfaßt.7. Arrangement according to claim 3, characterized in that the transmitter (1) of the cloud height or visibility measuring device is provided to transmit light for detecting the foreign layer on the window (3) of the transmitter and that the separately arranged receiver (15, 16th ) detects the light reflected from the transmitter window on the foreign layer. 8. Anordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Reinigungsvorrichtung (12, 18) aus einem Hochdruckluftaggregat besteht, das Luft, die erwärmt sein kann, an den Fensterflächen entlangbläst.8. Arrangement according to one of the preceding claims, characterized in that the cleaning device (12, 18) consists of a high-pressure air unit, the Air that can be heated blows along the window surfaces. 9. Anordnung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Reinigungsvorrichtung (12, 18) auch ein hin- und herschwingendes oder rotierendes Wischerblatt mit weicher Anlegekante enthält.9. Arrangement according to one of claims 1 to 8, characterized in that the cleaning device (12, 18) also contains a reciprocating or rotating wiper blade with a soft contact edge. 10. Anordnung nach Anspruch 9, dadurch gekennzeichnet, daß der weiche Teil des Wischerblattes durch einen Trokkenarm ersetzt ist, der einen auf die Fensterfläche gerichteten offenen Spalt oder eine Lochreihe hat, und daß durch diesen hohlen Trockenarm Druckluft oder Flüssigkeit derart zugeführt werden kann, daß sich bei Betrieb zwischen Trockenarm und Fenster ein Film aus Druckluft oder Flüssigkeit bildet.10. The arrangement according to claim 9, characterized in that the soft part of the wiper blade is replaced by a drying arm which has an open gap or a row of holes directed onto the window surface, and that compressed air or liquid can be supplied through this hollow drying arm in such a way that a film of compressed air or liquid forms between the drying arm and the window during operation.
EP19830111698 1982-11-30 1983-11-23 Apparatus for automatically cleaning windows Expired EP0112498B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8206819 1982-11-30
SE8206819A SE453539B (en) 1982-11-30 1982-11-30 DEVICE FOR CLEANING WINDOWS FOR CLOUD HEIGHT AND VIEW METERS

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EP0112498A2 true EP0112498A2 (en) 1984-07-04
EP0112498A3 EP0112498A3 (en) 1986-12-17
EP0112498B1 EP0112498B1 (en) 1989-02-01

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EP (1) EP0112498B1 (en)
JP (1) JPS59109878A (en)
DE (1) DE3379098D1 (en)
SE (1) SE453539B (en)

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SE8206819D0 (en) 1982-11-30
EP0112498B1 (en) 1989-02-01
SE8206819L (en) 1984-05-31
EP0112498A3 (en) 1986-12-17
SE453539B (en) 1988-02-18
DE3379098D1 (en) 1989-03-09
JPS59109878A (en) 1984-06-25

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