EP1827194B1 - Method for detecting the back-and-forth movement of a vacuum cleaner, and corresponding vacuum cleaner - Google Patents

Method for detecting the back-and-forth movement of a vacuum cleaner, and corresponding vacuum cleaner Download PDF

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Publication number
EP1827194B1
EP1827194B1 EP05817402A EP05817402A EP1827194B1 EP 1827194 B1 EP1827194 B1 EP 1827194B1 EP 05817402 A EP05817402 A EP 05817402A EP 05817402 A EP05817402 A EP 05817402A EP 1827194 B1 EP1827194 B1 EP 1827194B1
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EP
European Patent Office
Prior art keywords
motor current
vacuum cleaner
brush
attachment
sub
Prior art date
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Not-in-force
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EP05817402A
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German (de)
French (fr)
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EP1827194A1 (en
Inventor
Carsten Zautke
Martin Fieseler
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Vorwerk and Co Interholding GmbH
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Vorwerk and Co Interholding GmbH
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Publication of EP1827194A1 publication Critical patent/EP1827194A1/en
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Classifications

    • 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
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/02—Nozzles
    • A47L9/04—Nozzles with driven brushes or agitators
    • A47L9/0405—Driving means for the brushes or agitators
    • A47L9/0411—Driving means for the brushes or agitators driven by electric motor
    • 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
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2805—Parameters or conditions being sensed
    • A47L9/2831—Motor parameters, e.g. motor load or speed
    • 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
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2836—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means characterised by the parts which are controlled
    • A47L9/2842—Suction motors or blowers
    • 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
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2836—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means characterised by the parts which are controlled
    • A47L9/2847—Surface treating elements

Definitions

  • the invention firstly relates to a method for detecting the forward and backward movement of an electric motor driven brush having intent of a vacuum cleaner, in particular household vacuum cleaner, according to the features of the preamble of claim 1.
  • the invention has the object to provide a method of the type in question, which allows the best possible adaptation to the respective conditions, in particular floor coverings.
  • the reference motor current is a motor current averaged from a continuous measurement.
  • the reference motor current is then adjusted to the prevailing conditions, such as the carpet pile height, which affects the resistance on the brush.
  • the brush of the vacuum cleaner or of the attachment connected to the vacuum cleaner is driven about a rotational axis extending transversely to the direction of movement.
  • the drive direction of the brush is usually selected in the feed direction of the vacuum cleaner, so that the mechanically dissolved dirt with respect to a conventional feed movement of the device is thrown back towards the arranged there, vacuum-loaded suction mouth.
  • the current consumption of the brush is lower in the forward movement of the device than in a return movement of the device, in which the rotational movement of the brush acts counter to the direction of movement of the device.
  • the rotating brush acts here in conjunction with the return movement of the device as a resistance, which is reflected in increased power consumption. If the determined motor current is lower than the reference motor current, then the above-described rotational movement of the electric motor-driven brush is a forward movement of the device. If the determined motor current is greater than the reference motor current, it is a return movement. The standstill of the vacuum cleaner or connected to this, the electric motor driven brush having attachment is by means of of the method detectable. In this state, the determined motor current is approximately equal to the reference motor current.
  • the determined motor current is averaged with the aid of a low-pass filter, the time constant of the low-pass filter being large compared with a typical forward and reverse time of the header, eg. 1 to 5 sec., Preferably about 3 sec.
  • the motor current is more preferably determined by means of a shunt resistor. At this shunt resistor, a voltage drops, which is proportional to the motor current.
  • the invention relates to a vacuum cleaner according to the features of the preamble of claim 4.
  • the invention has the object to provide a vacuum cleaner of the type mentioned, which allows an advantageous detection of the direction of movement of the brush.
  • the measuring device detects the already occurring motor current during the operation of the device and compares it with the reference motor current.
  • the reference motor current In a conventional rotational movement of the driven brush in the feed direction of the device compared to the reference motor current detected lower motor current corresponds to the forward movement of the vacuum cleaner or the attachment, since the rotating brush acts less than resistance, but even movement supportive in this direction. If, on the other hand, the detected motor current is greater than the reference motor current, then the return movement of the device can be summed up from this. The case here against the device movement direction rotating brush acts accordingly as a resistor, which leads to an increased power consumption.
  • the proposed measuring device even a standstill of the device or the vacuum cleaner can be detected by the proposed measuring device. This is the case when the detected motor current is approximately equal to the reference motor current.
  • a shunt resistor is preferably provided, at which a voltage drops, which is proportional to the motor current.
  • the averaging circuit provided, which has a low pass. Accordingly, the reference motor current to be compared with the detected motor current is adapted to the prevailing conditions during the suction processing, such as carpet pile height, etc.
  • the time constant of the low-pass filter is set large compared with a typical forward and return time of the vacuum cleaner or of the attachment, in particular between 1 to 5 seconds, preferably 3 seconds.
  • a vacuum cleaner 1 is shown in the form of a stalk-guided household vacuum cleaner to which a header 2 is connected both electrically and fluidly.
  • the latter has a roller-shaped brush 3, the axis of rotation x is aligned parallel to the front edge edge of the attachment 2 and thus transversely to a conventional travel direction r, which corresponds to a forward movement of the device 2.
  • the roller-shaped brush 3 has radially protruding bristle tufts 4, which project beyond the bottom of the device 5 on the underside, for mechanical brushing of the carpet to be cleaned 6.
  • the brush 3 is driven by an electric motor.
  • the relevant electric motor 7 is in the FIGS. 2 and 3 only shown schematically.
  • the power transmission takes place via a belt drive 8, not shown.
  • the electric motor 7 is offset via the belt drive 8, the brush 3 in a rotational movement about the axis x with a rotational direction d, which is chosen so that during conventional advancement of the attachment 2 in the direction of travel r a supporting thrust effect is reached.
  • a direction of rotation of the brush 3 is selected so that by friction with the carpet 6, a component of movement in the direction of travel r is reached.
  • a direction of rotation of the brush 3 is selected counterclockwise.
  • This motor current is used to detect the forward and backward movement of the attachment 2.
  • a measuring device such as, for example, based on a first embodiment in Fig. 5 provided, which measures the motor current of the brush 3 driving electric motor 7 and compares this determined motor current value with a reference motor current value.
  • the reference motor current I RM is a motor current averaged from a continuous measurement, an averaging circuit having a low-pass filter 11 being provided to provide the reference motor current I RM .
  • the time constant of the low-pass filter 11 is sized large compared to a typical forward and return time of the attachment 2, so for example. With three seconds. Within this time, the header 2 has been moved at least once in the forward direction r and once in the return direction r 'in the rule.
  • the value I RM averaged therefrom is currently adapted to the conditions, for example, to the frictional resistance built up between the bristles 4 of the brush 3 and the carpet 6, which, in turn, depends on the carpet pile height, among other things.
  • the relevant motor current I M is determined by means of a shunt resistor 12, at which a voltage drops, which is proportional to the motor current.
  • the instantaneous motor current I M is compared by means of a comparator 13 with the averaged motor current I RM . If the instantaneous motor current I M is less than the averaged motor current I R , this is to be deduced from a movement of the attachment 2 in the usual forward direction r. If, however, the instantaneous motor current I M is greater than the average motor current I RM , this can be deduced from a displacement of the attachment 2 in the return direction r '. Even the stoppage of the attachment 2 can be detected by means of this measuring device 10, since in this case the instantaneous motor current I M corresponds approximately to the averaged motor current I RM .
  • FIG. 6 an alternative circuit arrangement is shown.
  • the signal processing takes place digitally by means of a microprocessor 14 after the current signal has been digitized with the aid of an analog-to-digital converter 15.
  • the obtained movement direction signal can be used to control the brush motor 7 and / or the fan motor in the vacuum cleaner and / or to control secondary air openings in the suction mouth 9 of the header 2 limiting area.
  • the motion is detected electrically / electronically without the use of particular wear-prone mechanical or optical / acoustic sensor elements or the like.

Abstract

The invention relates to a method for detecting the back-and-forth movement of an attachment (2) of a vacuum cleaner (1), especially a household vacuum cleaner, comprising an electromotive brush (3), and to a vacuum cleaner, especially a household vacuum cleaner. The aim of the invention is to simplify one such method and to improve one such vacuum cleaner. To this end, the motor power (I <SUB>M</SUB>) for driving the brush (3) is measured and compared with a reference motor power (I <SUB>R-M</SUB>) in order to determine the back-and-forth movement, and the vacuum cleaner is provided with a measuring device (10) which measures the motor power (I<SUB>M</SUB>) of the electric motor (7) driving the brush (3). A comparator (13) is used to compare the measured motor power (I<SUB>M</SUB>) with a reference motor power (I<SUB>R-M</SUB>).

Description

Die Erfindung betrifft zunächst ein Verfahren zum Erfassen der Vor- und Rückbewegung eines eine elektromotorisch angetriebene Bürste aufweisenden Vorsatzes eines Staubsaugers, insbesondere Haushaltsstaubsaugers, nach den Merkmalen des Oberbegriffes des Anspruches 1.The invention firstly relates to a method for detecting the forward and backward movement of an electric motor driven brush having intent of a vacuum cleaner, in particular household vacuum cleaner, according to the features of the preamble of claim 1.

Es besteht das Bedürfnis, die Bewegungsrichtung des Staubsaugers, insbesondere eines an diesen angeschlossenen Vorsatzgerätes mit einer elektromotorisch angetriebenen Bürste zu erfassen, um aus der ermittelten Schub- oder Zugrichtung Maßnahmen zur Beeinflussung des Staubsaugers bzw. des die Bürste aufweisenden Vorsatzgerätes abzuleiten. Diesbezüglich ist es bekannt, den Staubsauger bzw. das die elektromotorisch angetriebene Bürste aufweisende Vorsatzgerät mit einem Schlepphebel zu versehen, welcher gerätebodenseitig angeordnet ist. Durch Reibung mit dem zu saugenden Boden, insbesondere Teppichboden, wird der Schlepphebel entsprechend ausgelenkt, welche Schwenkstellung von einem Kippschalter oder dergleichen elektrisch erfasst wird.There is a need to detect the direction of movement of the vacuum cleaner, in particular a connected thereto attachment with an electric motor driven brush to derive measures from the determined pushing or pulling direction for influencing the vacuum cleaner or the brush having the attachment. In this regard, it is known to provide the vacuum cleaner or the electric motor driven brush having attachment with a cam follower, which is arranged on the device bottom side. By friction with the soil to be sucked, in particular carpeting, the drag lever is deflected accordingly, which pivot position is detected electrically by a toggle switch or the like.

Im Weiteren ist es aus den Patent Abstracts of Japan, Veröffentlichungsnummer o4176424. Veröffentlichungsdatum 24.06.1992, Anmeldenummer 02305149 , bekannt, den Vergleich mit einem vorgegebenen Referenz-Motorstrom vorzunehmen. Diese Ausführung wird jedoch nicht den tatsächlichen Einsatzbedingungen eines solchen Staubsaugers immer gerecht. So können unterschiedliche Bodenbeläge unterschiedliche Referenz-Motorströme gegebenenfalls erfordern.Furthermore, it is from the Patent Abstracts of Japan, Publication No. o4176424. Publication date 24.06.1992, application number 02305149 , known to make the comparison with a predetermined reference motor current. However, this embodiment does not always meet the actual conditions of use of such a vacuum cleaner. For example, different floor coverings may require different reference motor currents.

Ausgehend von dem genannten Stand der Technik stellt sich der Erfindung die Aufgabe, ein Verfahren der in Rede stehenden Art anzugeben, das eine möglichst gute Anpassung an jeweilige Bedingungen, insbesondere Bodenbeläge, ermöglicht.Based on the cited prior art, the invention has the object to provide a method of the type in question, which allows the best possible adaptation to the respective conditions, in particular floor coverings.

Diese Aufgabe ist beim Gegenstand des Anspruches 1 gelöst, wobei darauf abgestellt ist, dass der Referenz-Motorstrom ein aus einer fortlaufenden Messung gemittelter Motorstrom ist. Der Referenz-Motorstrom ist danach angepasst an die vorherrschenden Bedingungen, wie beispielsweise die auf den Widerstand an der Bürste Einfluss nehmenden Teppichflorhöhe. In üblicher Weise ist die Bürste des Staubsaugers bzw. des an dem Staubsauger angeschlossenen Vorsatzgerätes um eine quer zur Bewegungsrichtung verlaufende Rotationsachse angetrieben. Die Antriebsrichtung der Bürste ist in der Regel in Vorschubrichtung des Staubsaugers gewählt, so dass der mechanisch gelöste Schmutz mit Bezug auf eine übliche Vorschubbewegung des Gerätes nach hinten in Richtung auf den dort angeordneten, unterdruckbelasteten Saugmund abgeworfen wird. Die Stromaufnahme der Bürste ist in der Vorbewegung des Gerätes geringer als bei einer Rückbewegung des Gerätes, bei welcher die Rotationsbewegung der Bürste entgegen der Bewegungsrichtung des Gerätes wirkt. Die rotierende Bürste wirkt hier in Verbindung mit der Rückbewegung des Gerätes als Widerstand, was sich in erhöhter Stromaufnahme widerspiegelt. Ist der ermittelte Motorstrom geringer als der Referenz-Motorstrom, so handelt es sich bei der vorbeschriebenen Rotationsbewegung der elektromotorisch angetriebenen Bürste um eine Vorbewegung des Gerätes. Ist der ermittelte Motorstrom größer als der Referenz-Motorstrom, handelt es sich um eine Rückbewegung. Auch der Stillstand des Staubsaugers bzw. des an diesem angeschlossenen, die elektromotorisch angetriebene Bürste aufweisenden Vorsatzgerätes ist mittels des Verfahrens erfassbar. In diesem Zustand ist der ermittelte Motorstrom annähernd gleich dem Referenz-Motorstrom.This object is achieved in the subject matter of claim 1, wherein it is pointed out that the reference motor current is a motor current averaged from a continuous measurement. The reference motor current is then adjusted to the prevailing conditions, such as the carpet pile height, which affects the resistance on the brush. In the usual way, the brush of the vacuum cleaner or of the attachment connected to the vacuum cleaner is driven about a rotational axis extending transversely to the direction of movement. The drive direction of the brush is usually selected in the feed direction of the vacuum cleaner, so that the mechanically dissolved dirt with respect to a conventional feed movement of the device is thrown back towards the arranged there, vacuum-loaded suction mouth. The current consumption of the brush is lower in the forward movement of the device than in a return movement of the device, in which the rotational movement of the brush acts counter to the direction of movement of the device. The rotating brush acts here in conjunction with the return movement of the device as a resistance, which is reflected in increased power consumption. If the determined motor current is lower than the reference motor current, then the above-described rotational movement of the electric motor-driven brush is a forward movement of the device. If the determined motor current is greater than the reference motor current, it is a return movement. The standstill of the vacuum cleaner or connected to this, the electric motor driven brush having attachment is by means of of the method detectable. In this state, the determined motor current is approximately equal to the reference motor current.

In einer bevorzugten Weiterbildung ist vorgesehen, dass der ermittelte Motorstrom mit Hilfe eines Tiefpasses gemittelt wird, wobei die Zeitkonstante des Tiefpasses gegenüber einer typischen Vor- und Rücklaufzeit des Vorsatzes groß ist, so bspw. 1 bis 5 Sek., bevorzugt etwa 3 Sek.. Der Motorstrom wird weiter bevorzugt mit Hilfe eines Shunt-Widerstandes ermittelt. An diesem Shunt-Widerstand fällt eine Spannung ab, die proportional zum Motorstrom ist.In a preferred development, it is provided that the determined motor current is averaged with the aid of a low-pass filter, the time constant of the low-pass filter being large compared with a typical forward and reverse time of the header, eg. 1 to 5 sec., Preferably about 3 sec. The motor current is more preferably determined by means of a shunt resistor. At this shunt resistor, a voltage drops, which is proportional to the motor current.

Des Weiteren betrifft die Erfindung einen Staubsauger gemäß den Merkmalen des Oberbegriffes des Anspruches 4.Furthermore, the invention relates to a vacuum cleaner according to the features of the preamble of claim 4.

Bei Staubsaugern der in Rede stehenden Art besteht das Bedürfnis zwischen einer Vor- und einer Rückbewegung des Staubsaugers bzw. eines an diesem angeschlossenen Vorsatzgerätes mit elektromotorisch angetriebener Bürste zu unterscheiden, um gegebenenfalls aus der ermittelten Bewegungsrichtung heraus Maßnahmen bspw. zur Regelung des Bürstenmotors oder des Gebläsemotors abzuleiten. Diesbezüglich sind mechanische Lösungen bekannt, bei welchen bspw. gerätebodenunterseitig ein Schlepphebel angeordnet ist, welcher unter Mitnahme durch den überfahrenen Teppichboden in die eine oder andere Stellung verschwenkt wird. Die Schwenkstellung wird bspw. über einen Kippschalter elektrisch erfasst.In vacuum cleaners of the type in question, there is a need to differentiate between a forward and a return movement of the vacuum cleaner or a connected thereto attachment with electric motor driven brush, if necessary from the determined direction of movement measures, for example. For controlling the brush motor or the fan motor derive. In this regard, mechanical solutions are known in which, for example, device bottom underside a drag lever is arranged, which is pivoted under entrainment by the run over carpet in one or the other position. The pivot position is detected electrically, for example, via a toggle switch.

Zum Stand der Technik ist weiter auf das Patent Abstract of Japan, Veröffentlichungsnummer o4176424, Veröffentlichungsdatum 24.06.1992, Anmeldenummer 02305149 verwiesen. Hieraus ist bekannt, den Motorstrom mit einer festen Referenzgröße zu vergleichen. Weiter ist zum Stand der Technik auf die EP 0479609 A2 zu verweisen, die diesbezüglich auch nichts Weitergehendes beschreibt.The state of the art is further on the Patent abstract of Japan, publication number o4176424, publication date 24.06.1992, application number 02305149 directed. From this it is known to compare the motor current with a fixed reference value. Next is the state of Technology on the EP 0479609 A2 to refer, which does not describe anything further in this regard.

Ausgehend von dem vorgenannten Stand der Technik stellt sich der Erfindung die Aufgabe, einen Staubsauger der genannten Art anzugeben, der eine vorteilhafte Erkennung der Bewegungsrichtung der Bürste ermöglicht.Based on the aforementioned prior art, the invention has the object to provide a vacuum cleaner of the type mentioned, which allows an advantageous detection of the direction of movement of the brush.

Diese Aufgabe ist beim Gegenstand des Anspruches 4 gelöst, wobei darauf abgestellt ist, dass zur Bereitstellung des Referenz-Motorstroms eine zur fortlaufende Messung des Motorstroms ausgelegte Mittlungsschaltung vorgesehen ist, die einen Tiefpass aufweist. Die Messeinrichtung erfasst den ohnehin anfallenden Motorstrom während des Betriebs des Gerätes und vergleicht diesen mit dem Referenz-Motorstrom. Bei einer üblichen Rotationsbewegung der angetriebenen Bürste in Vorschubrichtung des Gerätes entspricht ein gegenüber dem Referenz-Motorstrom geringerer erfasster Motorstrom der Vorbewegung des Staubsaugers bzw. des Vorsatzgerätes, da die rotierende Bürste weniger als Widerstand, sondern vielmehr sogar bewegungsunterstützend in diese Richtung wirkt. Ist hingegen der erfasste Motorstrom größer als der Referenz-Motorstrom, so kann hieraus die Rückbewegung des Gerätes resümiert werden. Die hierbei entgegen der Gerätebewegungsrichtung rotierende Bürste wirkt entsprechend als Widerstand, was zu einer erhöhten Stromaufnahme führt. Darüber hinaus kann mittels der vorgeschlagenen Messeinrichtung sogar ein Stillstand des Gerätes bzw. des Staubsaugers erkannt werden. Dies ist dann der Fall, wenn der erfasste Motorstrom annähernd gleich dem Referenz-Motorstrom ist. In der Motorstrom-Messeinrichtung ist bevorzugt ein Shunt-Widerstand vorgesehen, an welchem eine Spannung abfällt, die proportional zum Motorstrom ist. Zur Bereitstellung des Referenz-Motorstroms ist die Mittlungsschaltung vorgesehen, die einen Tiefpass aufweist. Entsprechend ist der mit dem erfassten Motorstrom zu vergleichende Referenzmotorstrom angepasst an die während der Saugbearbeitung vorherrschenden Gegebenheiten, wie bspw. Teppichflorhöhe usw.This object is achieved in the subject matter of claim 4, wherein it is pointed out that provided for providing the reference motor current designed for continuous measurement of the motor current averaging circuit having a low-pass filter. The measuring device detects the already occurring motor current during the operation of the device and compares it with the reference motor current. In a conventional rotational movement of the driven brush in the feed direction of the device compared to the reference motor current detected lower motor current corresponds to the forward movement of the vacuum cleaner or the attachment, since the rotating brush acts less than resistance, but even movement supportive in this direction. If, on the other hand, the detected motor current is greater than the reference motor current, then the return movement of the device can be summed up from this. The case here against the device movement direction rotating brush acts accordingly as a resistor, which leads to an increased power consumption. In addition, even a standstill of the device or the vacuum cleaner can be detected by the proposed measuring device. This is the case when the detected motor current is approximately equal to the reference motor current. In the motor current measuring device, a shunt resistor is preferably provided, at which a voltage drops, which is proportional to the motor current. To provide the reference motor current is the averaging circuit provided, which has a low pass. Accordingly, the reference motor current to be compared with the detected motor current is adapted to the prevailing conditions during the suction processing, such as carpet pile height, etc.

Die Zeitkonstante des Tiefpasses ist gegenüber einer typischen Vor- und Rücklaufzeit des Staubsaugers bzw. des Vorsatzgerätes groß eingestellt, so insbesondere zwischen 1 bis 5 Sek., bevorzugt 3 Sek.The time constant of the low-pass filter is set large compared with a typical forward and return time of the vacuum cleaner or of the attachment, in particular between 1 to 5 seconds, preferably 3 seconds.

Nachstehend ist die Erfindung anhand der beigefügten Zeichnung, welche lediglich zwei Ausführungsbeispiele darstellt, näher erläutert. Es zeigt:

Fig. 1
in perspektivischer Darstellung einen stielgeführten Haushalts- staubsauger mit einem, eine nicht näher dargestellte elektromoto- risch angetriebene Bürste aufweisenden Vorsatzgerätes;
Fig. 2
in einer partiell geschnittenen Schema-Seitenansicht das Vorsatz- gerät während des Saugbetriebs, bei Vorverlagerung desselben;
Fig. 3
eine der Fig. 2 entsprechende Darstellung, jedoch bei Rückverla- gerung des Vorsatzgerätes;
Fig. 4
eine idealisierte Darstellung eines Motorstromaufnahme- Diagrammes;
Fig. 5
die in analoger Schaltung aufgebaute Messeinrichtung;
Fig. 6
die Messeinrichtung in einer zweiten Ausführungsform, digital aufgebaut.
The invention with reference to the accompanying drawings, which illustrates only two embodiments, explained in more detail. It shows:
Fig. 1
in a perspective view of a stalk-guided household vacuum cleaner with a, an unspecified electric motor-driven brush having attachment;
Fig. 2
in a partially sectioned schematic side view of the attachment during the suction operation, when advancing the same;
Fig. 3
one of the Fig. 2 Corresponding illustration, however, when the attachment is returned;
Fig. 4
an idealized representation of a motor current consumption diagram;
Fig. 5
the built in analog circuit measuring device;
Fig. 6
the measuring device in a second embodiment, digitally constructed.

In Fig. 1 ist ein Staubsauger 1 in Form eines stielgeführten Haushaltsstaubsaugers dargestellt, an welchem ein Vorsatzgerät 2 sowohl elektrisch als auch strömungsmäßig angeschlossen ist. Letzteres weist eine walzenförmige Bürste 3 auf, deren Rotationsachse x parallel ausgerichtet ist zur stirnseitigen Randkante des Vorsatzgerätes 2 und somit quer zu einer üblichen Verfahrrichtung r, welcher einer Vorbewegung des Gerätes 2 entspricht.In Fig. 1 a vacuum cleaner 1 is shown in the form of a stalk-guided household vacuum cleaner to which a header 2 is connected both electrically and fluidly. The latter has a roller-shaped brush 3, the axis of rotation x is aligned parallel to the front edge edge of the attachment 2 and thus transversely to a conventional travel direction r, which corresponds to a forward movement of the device 2.

Die walzenförmige Bürste 3 weist radial abstehende Borstenbüschel 4 auf, die unterseitig über den Geräteboden 5 hinausragen, zur mechanischen Bürstbearbeitung des zu reinigenden Teppichbodens 6.The roller-shaped brush 3 has radially protruding bristle tufts 4, which project beyond the bottom of the device 5 on the underside, for mechanical brushing of the carpet to be cleaned 6.

Die Bürste 3 ist elektromotorisch angetrieben. Der diesbezügliche Elektromotor 7 ist in den Figuren 2 und 3 lediglich schematisch dargestellt. Die Kraftübertragung erfolgt über einen nicht näher dargestellten Riementrieb 8.The brush 3 is driven by an electric motor. The relevant electric motor 7 is in the FIGS. 2 and 3 only shown schematically. The power transmission takes place via a belt drive 8, not shown.

Der Elektromotor 7 versetzt über den Riementrieb 8 die Bürste 3 in eine Rotationsbewegung um die Achse x mit einer Drehrichtung d, die so gewählt ist, dass bei üblicher Vorbewegung des Vorsatzgerätes 2 in Verfahrrichtung r eine unterstützende Schubwirkung erreicht ist. Wie insbesondere aus der Darstellung in Fig. 2 zu erkennen, ist die Drehrichtung der Bürste 3 so gewählt, dass durch Reibung mit dem Teppichboden 6 eine Bewegungskomponente in Verfahrrichtung r erreicht ist. Mit Bezug zu den Darstellungen ist eine Drehrichtung der Bürste 3 entgegen dem Uhrzeigersinn gewählt.The electric motor 7 is offset via the belt drive 8, the brush 3 in a rotational movement about the axis x with a rotational direction d, which is chosen so that during conventional advancement of the attachment 2 in the direction of travel r a supporting thrust effect is reached. As in particular from the illustration in Fig. 2 to recognize the direction of rotation of the brush 3 is selected so that by friction with the carpet 6, a component of movement in the direction of travel r is reached. With reference to the illustrations, a direction of rotation of the brush 3 is selected counterclockwise.

Der durch die rotierende Bürste 3 aus dem Teppichboden 6 gelöste Staub bzw. Schmutz wird in üblicher Weise durch den von der Bürste 3 durchtretenen Saugmund 9 und über eine nicht näher dargestellte Saugkanalleitung abtransportiert.The dissolved by the rotating brush 3 from the carpet 6 dust or dirt is transported away in the usual manner by the penetrated by the brush 3 suction port 9 and a Saugkanalleitung not shown.

Bei einer Rückbewegung - wie in Fig. 3 dargestellt - wird das Vorsatzgerät 2 bzw. der Staubsauger 1 entgegen der üblichen Verfahrrichtung r in Rückfahrrichtung r' bewegt, dies bei weiterhin in Rotationsrichtung d laufender Bürste 3. Letztere wirkt in Zusammenwirkung mit dem Teppichboden 6 entsprechend entgegen dieser Rückbewegungsrichtung r', womit ein erhöhter Widerstand an der Bürste 3 erreicht wird. Eine Erhöhung des Widerstandes geht einher mit einer Erhöhung des entsprechenden Motorstroms.In a return movement - as in Fig. 3 The attachment 2 or the vacuum cleaner 1 is moved counter to the usual direction of travel r in the return direction r ', this in further in the direction of rotation d running brush 3. The latter acts in cooperation with the carpet 6 in accordance with this return direction r', whereby an increased Resistance to the brush 3 is achieved. Increasing the resistance is accompanied by an increase in the corresponding motor current.

Dieser Motorstrom wird zur Erfassung der Vor- und Rückbewegung des Vorsatzgerätes 2 genutzt. Hierzu ist eine Messeinrichtung wie bspw. anhand einer ersten Ausführungsform in Fig. 5 dargestellt vorgesehen, die den Motorstrom des die Bürste 3 antreibenden Elektromotors 7 misst und diesen ermittelten Motorstromwert mit einem Referenz-Motorstromwert vergleicht.This motor current is used to detect the forward and backward movement of the attachment 2. For this purpose, a measuring device such as, for example, based on a first embodiment in Fig. 5 provided, which measures the motor current of the brush 3 driving electric motor 7 and compares this determined motor current value with a reference motor current value.

Der Referenz-Motorstrom IR-M ist ein aus einer fortlaufenden Messung gemittelter Motorstrom, wobei zur Bereitstellung des Referenz-Motorstroms IR-M eine Mittlungsschaltung vorgesehen ist, die einen Tiefpass 11 aufweist. Die Zeitkonstante des Tiefpasses 11 ist gegenüber einer typischen Vor- und Rücklaufzeit des Vorsatzgerätes 2 groß bemessen, so bspw. mit drei Sekunden. Innerhalb dieser Zeit ist in der Regel das Vorsatzgerät 2 zumindest einmal in Vorlaufrichtung r und einmal in Rücklaufrichtung r' bewegt worden. Der hieraus gemittelte Wert IR-M ist aktuell angepasst an die Gegebenheiten, so bspw. an den zwischen den Borsten 4 der Bürste 3 und dem Teppichboden 6 aufgebauten Reibwiderstand, welcher wiederum unter anderem abhängig ist von der Teppichflorhöhe.The reference motor current I RM is a motor current averaged from a continuous measurement, an averaging circuit having a low-pass filter 11 being provided to provide the reference motor current I RM . The time constant of the low-pass filter 11 is sized large compared to a typical forward and return time of the attachment 2, so for example. With three seconds. Within this time, the header 2 has been moved at least once in the forward direction r and once in the return direction r 'in the rule. The value I RM averaged therefrom is currently adapted to the conditions, for example, to the frictional resistance built up between the bristles 4 of the brush 3 and the carpet 6, which, in turn, depends on the carpet pile height, among other things.

Der relevante Motorstrom I M wird mit Hilfe eines Shunt-Widerstandes 12 ermittelt, an welchem eine Spannung abfällt, die proportional zum Motorstrom ist.The relevant motor current I M is determined by means of a shunt resistor 12, at which a voltage drops, which is proportional to the motor current.

Der momentane Motorstrom I M wird mit Hilfe eines Komparators 13 mit dem gemittelten Motorstrom I R-M verglichen. Ist der momentane Motorstrom I M geringer als der gemittelte Motorstrom I R, so ist hieraus auf eine Bewegung des Vorsatzgerätes 2 in üblicher Vorwärtsrichtung r zu schließen. Ist hingegen der momentane Motorstrom I M größer als der gemittelte Motorstrom I R-M, lässt dies auf eine Verlagerung des Vorsatzgerätes 2 in Rückbewegungsrichtung r' schließen. Selbst der Stillstand des Vorsatzgerätes 2 ist mittels dieser Messeinrichtung 10 erfassbar, da hierbei der momentane Motorstrom I M annähernd dem gemittelten Motorstrom I R-M entspricht.The instantaneous motor current I M is compared by means of a comparator 13 with the averaged motor current I RM . If the instantaneous motor current I M is less than the averaged motor current I R , this is to be deduced from a movement of the attachment 2 in the usual forward direction r. If, however, the instantaneous motor current I M is greater than the average motor current I RM , this can be deduced from a displacement of the attachment 2 in the return direction r '. Even the stoppage of the attachment 2 can be detected by means of this measuring device 10, since in this case the instantaneous motor current I M corresponds approximately to the averaged motor current I RM .

In Figur 6 ist eine alternative Schaltungsanordnung dargestellt. Hierbei erfolgt die Signalverarbeitung digital mittels eines Mikroprozessors 14, nachdem das Stromsignal mit Hilfe eines Analog-Digital-Umsetzers 15 digitalisiert wurde.In FIG. 6 an alternative circuit arrangement is shown. In this case, the signal processing takes place digitally by means of a microprocessor 14 after the current signal has been digitized with the aid of an analog-to-digital converter 15.

Das gewonnene Bewegungsrichtungssignal kann zur Regelung des Bürstenmotors 7 und/oder des Gebläsemotors im Staubsauger und/oder zur Steuerung von Nebenluftöffnungen in dem den Saugmund 9 des Vorsatzgerätes 2 begrenzenden Bereich benutzt werden. Die Bewegungserfassung erfolgt auf elektrisch/elektronischem Wege ohne Inanspruchnahme von insbesondere verschleißanfälligen mechanischen oder optischen/akustischen Sensorelementen oder dergleichen.The obtained movement direction signal can be used to control the brush motor 7 and / or the fan motor in the vacuum cleaner and / or to control secondary air openings in the suction mouth 9 of the header 2 limiting area. The motion is detected electrically / electronically without the use of particular wear-prone mechanical or optical / acoustic sensor elements or the like.

Alle offenbarten Merkmale sind (für sich) erfindungswesentlich.All disclosed features are essential to the invention.

Claims (6)

  1. Method for detecting the forward and backward movement of an attachment (2) of a vacuum cleaner (1), in particular a domestic vacuum cleaner, said attachment having an electric-motor-driven brush (3), the motor current (IM) used to drive the brush (3) being measured and compared with a reference motor current (IR-M) in order to recognize the forward and backward movement, characterised in that the reference motor current (IR-M) is a motor current averaged from a continuous measurement.
  2. Method according to claim 1, characterised in that the detected motor current is averaged using a low-pass filter (11), the time constant of the low-pass filter (11) being large compared to the time of a typical forward and backward movement of the attachment (2).
  3. Method according to either claim 1 or claim 2, characterised in that the motor current (IM) is detected using a shunt resistor (12).
  4. Vacuum cleaner (1), in particular a domestic vacuum cleaner, having an electric-motor-driven brush (3) and a measuring means (10) which measures the motor current (IM) of the electric motor (7) driving the brush (3), a comparator (13) being provided which compares the measured motor current (IM) with a reference motor current (IR-M), characterised in that, for providing the reference motor current (IR-M), an averaging circuit is provided which is designed to continuously measure the motor current and comprises a low-pass filter (11).
  5. Vacuum cleaner according to claim 4, characterised in that a shunt resistor (12) is provided in the motor current measuring means (10).
  6. Vacuum cleaner according to either claim 4 or claim 5, characterised in that the time constant of the low-pass filter (11) is set to be large compared to the time of a typical forward and backward movement of the vacuum cleaner (1).
EP05817402A 2004-12-24 2005-12-16 Method for detecting the back-and-forth movement of a vacuum cleaner, and corresponding vacuum cleaner Not-in-force EP1827194B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004062536A DE102004062536A1 (en) 2004-12-24 2004-12-24 Method for detecting the forward and backward movement of a vacuum cleaner and vacuum cleaner for this purpose
PCT/EP2005/056861 WO2006069923A1 (en) 2004-12-24 2005-12-16 Method for detecting the back-and-forth movement of a vacuum cleaner, and corresponding vacuum cleaner

Publications (2)

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EP1827194A1 EP1827194A1 (en) 2007-09-05
EP1827194B1 true EP1827194B1 (en) 2010-10-20

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EP05817402A Not-in-force EP1827194B1 (en) 2004-12-24 2005-12-16 Method for detecting the back-and-forth movement of a vacuum cleaner, and corresponding vacuum cleaner

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EP (1) EP1827194B1 (en)
JP (1) JP2008525073A (en)
CN (1) CN101083932B (en)
AT (1) ATE484991T1 (en)
DE (2) DE102004062536A1 (en)
RU (1) RU2007128343A (en)
TW (1) TW200631541A (en)
WO (1) WO2006069923A1 (en)

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FR3137556A1 (en) * 2022-07-11 2024-01-12 Seb S.A. Vacuum cleaner comprising floor detection means

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DE102013102847A1 (en) * 2013-03-20 2014-09-25 Miele & Cie. Kg Method for adjusting the performance of a vacuum cleaner fan, control device for implementing the method and vacuum cleaner with such a control device
DE102014111720A1 (en) * 2014-08-18 2016-02-18 Miele & Cie. Kg Electric brush for a vacuum cleaner with eddy current brake
DE102014114375A1 (en) * 2014-10-02 2016-04-07 Vorwerk & Co. Interholding Gmbh Powered brush as attachment for a vacuum cleaner
CN109276184B (en) * 2017-07-21 2022-03-29 添可电器有限公司 Handheld dust collector and control method thereof
CN112493920A (en) * 2020-11-25 2021-03-16 深圳拓邦股份有限公司 Work control method and device of cleaning equipment and cleaning equipment
CN112515578B (en) * 2020-11-25 2022-06-17 深圳拓邦股份有限公司 Work control method and device of cleaning equipment and cleaning equipment
CN115474865A (en) * 2021-06-16 2022-12-16 创科无线普通合伙 Floor cleaner
CN114252651A (en) * 2021-11-04 2022-03-29 深圳拓邦股份有限公司 Equipment motion direction detection device and electronic equipment

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FR3137557A1 (en) * 2022-07-11 2024-01-12 Seb S.A. Vacuum cleaner with floor protection operating mode
FR3137556A1 (en) * 2022-07-11 2024-01-12 Seb S.A. Vacuum cleaner comprising floor detection means
EP4306024A1 (en) * 2022-07-11 2024-01-17 Seb S.A. Vacuum cleaner comprising ground detection means
EP4306021A1 (en) * 2022-07-11 2024-01-17 Seb S.A. Vacuum cleaner with a function for protecting the ground
WO2024013439A1 (en) * 2022-07-11 2024-01-18 Seb S.A. Vacuum cleaner comprising floor detection means
WO2024013440A1 (en) * 2022-07-11 2024-01-18 Seb S.A. Vacuum cleaner having an operating mode for protecting floors

Also Published As

Publication number Publication date
RU2007128343A (en) 2009-01-27
DE102004062536A1 (en) 2006-07-06
CN101083932A (en) 2007-12-05
CN101083932B (en) 2010-12-15
TW200631541A (en) 2006-09-16
EP1827194A1 (en) 2007-09-05
DE502005010428D1 (en) 2010-12-02
JP2008525073A (en) 2008-07-17
ATE484991T1 (en) 2010-11-15
WO2006069923A1 (en) 2006-07-06

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