DE102018129114A1 - Method for operating a vacuum cleaner system and vacuum cleaner system - Google Patents

Abstract

The invention relates to a method for operating a vacuum cleaner system (1) with a vacuum cleaner (10) with a blower (12) which generates an air flow (A), the blower (12) having an electric motor (12b) which has an impeller (12a ) of the blower (12), and with a suction nozzle (18), which is connected to the vacuum cleaner (10) and is guided over a base (2), the method with at least the following steps:
Operating (100) the electric motor (12b) with a first power,
Detection (200a) or determination (200b) of a first speed (q) and / or a first torque of the electric motor (12b),
• Determining (300) a negative pressure (p) as a function of at least two operating parameters of the first power, the first speed (q) and the first torque of the electric motor (12b), and
• Operation (600) of the electric motor (12b) with a second power depending on the determined negative pressure (p).

Description

The invention relates to a method for operating a vacuum cleaner system according to claim 1 and a vacuum cleaner system for executing such a method according to claim 8.

The cleaning devices include the vacuum cleaners, which suck in air and dirt from a surface and which, at least essentially free of dirt, can release it to the outside again. For this purpose, a vacuum cleaner has a blower which can generate the air flow. In this way, a negative pressure can be generated on the suction side of the blower, which can ensure that air flows in; this section of the vacuum cleaner can also be referred to as the vacuum region of the vacuum cleaner. Depending on the design of the vacuum cleaner, the air flow and dirt can be guided directly via a suction nozzle as a suction opening, which is part of the vacuum cleaner itself. However, the suction nozzle, which can also be referred to as a floor nozzle, can also be connected to the vacuum cleaner via a suction hose and possibly an additional telescopic tube; in this case, the vacuum cleaner and the other components such as the suction nozzle, suction hose and, if applicable, telescopic tube can also be referred to together as a vacuum cleaner system. In any case, the suction nozzle can be guided over a surface by a user in order to pick up dirt from there with the sucked-in air.

On the opposite side of the blower, towards which the air flow is directed, there are usually at least one filter or a filter system through which the air flow is passed. This section of the vacuum cleaner can also be referred to as the overpressure range of the vacuum cleaner. The filter can remove dirt such as Retain dust, especially house dust, as well as other smaller particles from the air flow and thereby filter the air flow, which can then leave the vacuum cleaner cleaner than when vacuuming. This allows the surface to be cleaned of dirt. The surface can be any surface such as be a floor or its floor covering.

Because floors have different properties or different floor coverings such as Carpet, tiles, laminate, parquet and the like, the floors are usually differentiated between hard floors, also called smooth floors, and carpets. The type of floor has an impact on the requirements placed on the vacuum cleaner or its suction nozzle. So the dirt can be extracted from a hard or smooth floor with a comparatively low blower output, because on the one hand the dirt is loose on the smooth surface of the floor covering and on the other hand the distance between the suction nozzle and the surface of the floor covering is set comparatively low in height can become, which can favor the generation of the required negative pressure. A comparatively small aperture is thus established between the suction nozzle and the smooth bottom, so that the required air flow can be generated with a comparatively low blower output.

In contrast, the dirt in carpets can be held as a floor covering between or on the carpet fibers, so that a greater blower power may be required to carry the dirt with the sucked-in air stream. The carpet fibers can also form an air-permeable intermediate layer between the base body of the carpet holding the carpet fibers and the suction nozzle, which can increase the distance between the suction nozzle and the air-impermeable substrate, so that more air can pass laterally through the carpet fibers to the suction nozzle. As a result, a comparatively large aperture opening can be formed between the suction nozzle and the carpeting, which can make the formation of the negative pressure, which is necessary for sucking in the dirt, more difficult, so that the blower must also be operated at a higher power for this reason in order to achieve one To generate airflow which is comparable to the airflow when vacuuming on a smooth floor.

If a vacuum cleaner is operated with the same blower output on every type of surface, either hard or smooth floors can be cleaned effectively either with a comparatively low blower output and thus comparatively low energy consumption, since the suction power is usually not sufficient for carpets, or both can Types of floor coverings are cleaned, but with a blower output that is too high for hard or smooth floors, which can lead to a high energy consumption for these floors.

It should also be borne in mind that suction with a comparatively high blower output can cause the suction nozzle to get stuck on the floor. In this case, suction can be carried out on smooth floors with a comparatively high blower output without the floor nozzle being sucked onto the substrate due to excessive vacuum. With carpets, however, this can be the case due to the flexibility of the carpet fibers, so that the blower output is limited at the top, so that firm suction should be avoided. This can already make a noticeable suction of the suction nozzle on the floor also noticeable in that the user has to exert a higher force in order to move the suction nozzle over the floor. This force can be called pushing force.

It is therefore customary for the user to set the suction power of the blower on the one hand and for the user to change the suction nozzle between two variants. For hard or smooth floors, a smooth floor nozzle can be used which can have a bristle ring which is arranged all around and can ensure a minimum distance in height between the smooth floor and the suction nozzle. Since the bristles of the bristle ring can always ensure a minimum distance between the suction opening of the suction nozzle and the floor, it is not possible to fall below a predetermined aperture, at which sufficient air can always reach the suction opening through the bristles, so that suctioning and, in particular, firm suctioning are prevented can be. At the same time, this minimum distance can be sufficiently small that a negative pressure, which can enable effective cleaning, can be achieved with a comparatively low blower output. This power of the fan must be set by the user if the smooth floor nozzle is used and a hard or smooth floor is cleaned.

In the case of a carpet, a carpet nozzle can be used instead which does not have such a bristle ring, since its spacing effect can be achieved by the fibers of the carpet itself. The combination of carpet nozzle and carpet floor can therefore achieve a comparable aperture opening as when using a smooth floor nozzle on a smooth floor. Rather, in this case, a stronger fan power can be selected by the user in order to be able to suck the dirt out of the carpet fibers. At the same time, however, this should be sufficiently low to prevent the carpet nozzle from being sucked in and in particular from being sucked into the carpet.

Suction nozzles can also be used, which can have both properties, in that the bristle ring e.g. can be extended or retracted by actuating a foot lever on the suction nozzle. This means that a carpet nozzle can also be used as a smooth floor nozzle by the user selecting the appropriate suction nozzle setting. Such switchable nozzles can also be referred to as a universal nozzle.

The disadvantage here is that it is left to the user to adapt the power level of the blower of the vacuum cleaner to the type of substrate or to the suction nozzle or suction nozzle setting used. Thus, if the blower is set to a blower performance for carpets by a smooth floor, this can lead to increased and unnecessary energy consumption. This can also lead to unnecessarily high pushing forces which the user has to use to guide the suction nozzle over the surface. This can also lead to increased wear on the suction nozzle and the substrate. A stronger blower output is usually accompanied by a corresponding blower volume, which the user may find uncomfortable.

In the opposite case of vacuum cleaning on carpets with a fan power, which is intended for smooth floors, this can lead to inadequate cleaning performance or to an increased cleaning time, since the suction nozzle has to be guided more frequently over the same point on the carpet, at least to remove the dirt to be able to partially absorb. This can be cumbersome for the user and, as a result, unsatisfactory. This can also increase the duration of cleaning. In particular, the user can attribute the responsibility for the insufficient cleaning performance to the vacuum cleaner instead of the setting of the blower output which he incorrectly selected.

From the DE 10 2016 124 294 A1 a vacuum cleaner is known which has a vacuum sensor in the vacuum region of the air flow. If the vacuum sensor detects that the pressure drops below a stored pressure or exceeds a stored value, the suction nozzle can be prevented from being stuck or the suction can be released again by reducing the suction power of the blower to a predefined release value. This can be supported by a resilient element of the suction nozzle with sufficient restoring force, which can push the suction nozzle away from the surface and thereby enlarge the aperture of the suction nozzle. If the stored pressure value is then reached or exceeded again / the stored vacuum value is reached or fallen below again, the suction power can be increased again. Alternatively, this can also be achieved via a vacuum switch, which is designed for the stored pressure value and can switch accordingly. In any case, an optimal suction power of the blower of the vacuum cleaner can be set independently, so that the greatest possible blower power can be set automatically for the greatest possible cleaning effect without the suction nozzle being sucked up at the same time.

The disadvantage here is that the use of a vacuum sensor or a vacuum switch can lead to additional costs. In addition to the manufacturing or procurement costs for the vacuum sensor or for the vacuum switch itself and its cabling, these can also include costs for assembly. An additional space requirement for the vacuum sensor or for the vacuum switch itself and for its cabling must also be considered. Furthermore, a hose connection from the vacuum sensor or from the vacuum switch to the measuring point in the vacuum area of the fan and a seal in the transition from the vacuum sensor or from the vacuum switch to the housing of the vacuum cleaner may be required in order to be able to use the vacuum sensor or the vacuum switch in the vacuum area of the vacuum cleaner in the air flow . All this can lead to not inconsiderable additional costs for additional components and assembly steps as well as an additional space requirement.

The invention thus presents the problem of providing a vacuum cleaner system of the type described at the outset, so that the disadvantages described above can be overcome or at least reduced. In particular, the detection or determination of the vacuum of the blower and / or the automatic adjustment of the blower power should be possible without additional sensors, such as in particular without a vacuum sensor or without a vacuum switch. At least an alternative to known vacuum cleaner systems is to be created.

According to the invention, this problem is solved by a method with the features of claim 1 and by a vacuum system with the features of claim 8. Advantageous refinements and developments of the invention result from the following subclaims.

Thus, the present invention relates to a method for operating a vacuum cleaner system with a vacuum cleaner with a blower which generates an air flow, the blower having an electric motor which drives an impeller of the blower, and with a suction nozzle which is connected to the vacuum cleaner and via an underground is led. The movement of the vacuum cleaner system over the surface, e.g. over a surface such as Via a floor or its floor covering, a user or a drive of the vacuum cleaner system can e.g. done as a vacuum robot. The suction nozzle can be exchangeable and the user can thereby exchange the suction nozzle e.g. between a smooth floor nozzle and a carpet nozzle.

• • Betreiben des Elektromotors mit einer ersten Leistung,
• • Erfassen oder Bestimmen einer ersten Drehzahl und/oder eines ersten Drehmoments des Elektromotors,
• • Bestimmen eines Unterdrucks in Abhängigkeit von wenigstens zwei Betriebsparametern der ersten Leistung, der ersten Drehzahl und des ersten Drehmoments des Elektromotors, und
• • Betreiben des Elektromotors mit einer zweiten Leistung in Abhängigkeit des bestimmten Unterdrucks.

The method has at least the following steps:

• Operating the electric motor with a first power,
• Detection or determination of a first speed and / or a first torque of the electric motor,
• • Determining a negative pressure as a function of at least two operating parameters of the first power, the first speed and the first torque of the electric motor, and
• • Operation of the electric motor with a second power depending on the determined negative pressure.

The present invention is based on the knowledge that the required knowledge can also be obtained from the evaluation of at least two operating parameters of the electric motor of the blower of a vacuum cleaner, which previously had to be detected by means of an additional pressure sensor or pressure switch. In this way, it is also possible to determine the negative pressure applied to the suction nozzle at this time from at least two operating parameters of the power, the speed and the torque, which are recorded and / or determined at a common point in time. Depending on the specific negative pressure, the vacuum cleaner or its blower can then be operated with an appropriate output or its output can be changed. In this way, in particular, a power setting can be carried out, which primarily leads to pushing forces which ensure comfortable operation of the vacuum cleaner, and with which at the same time the best possible suction effect or the best possible cleaning result with the lowest possible energy consumption and preferably also the lowest possible noise development are achieved can. A "tight suction", which can make guiding the floor nozzle uncomfortable or, depending on the strength of the user, can make it completely impossible, is avoided.

The power can be regarded as known from the usually regulated electric motor. The speed and / or the torque can be sensed or determined from the operation of the electric motor via other known variables, so that such sensors can be dispensed with. If two of these three parameters, power, speed and torque, are known, the third parameter can be calculated from the other two parameters, since the power of an engine is generally the product of its speed and torque.

At least a corresponding relationship between two of the three operating parameters and the resulting negative pressure can be determined beforehand under defined conditions, for example in a laboratory and, for example, stored in a control unit of the vacuum cleaner or in a frequency converter of the electric motor. For example, for a predetermined output, the rotational speed which arises during suction, as well as the corresponding volume flow and / or vacuum, may have been sensed. This can have been carried out for different orifices of the suction nozzle, so that different value pairs can be recorded as speed and volume flow and / or underpressure for the predetermined power. These value pairs can be stored, for example, as a table of values (English: look-up table) or as an algorithm, for example in the control unit of the vacuum cleaner. This can have been carried out for several performance values, so that the relationships described above can also take into account a change in performance.

If the vacuum cleaner is now operated with a first output of its blower or its electric motor, then depending on the aperture opening, which results from the interaction of the substrate and suction nozzle, there will be a speed and a torque of the electric motor. The speed or the torque can now either be sensed or determined from the operation of the electric motor via other known variables and, if necessary, converted into the other value. Taking into account the previously described previously determined relationships between performance and e.g. Speed can be deduced from the negative pressure present. Depending on the negative pressure, the power of the electric motor can also be adjusted, taking into account the previously described relationships between negative pressure and power, so that the pushing forces caused by the negative pressure do not become too great.

Thus, according to the invention, a determination of a negative pressure value can take place instead of sensory detection, such as that from the DE 10 2016 124 294 A1 is known. The functions described there can thus be implemented without using the pressure sensor or pressure switch described there, which can correspondingly lead to reduced costs with regard to components and assembly and to space savings with the same or comparable functionality of the vacuum cleaner system.

This can advantageously be used to reduce or limit the pushing forces of the vacuum cleaner, or to optimize the user comfort in general. This can lead to improved comfort for the user compared to an operation which is carried out without the method according to the invention. This in particular enables automatic operation of the vacuum cleaner or the vacuum cleaner system, in which the performance of the blower or its electric motor can be adjusted as a function of the volume flow or the vacuum in such a way that a predetermined volume flow or vacuum is achieved and at the same time this required power is kept as low as possible. This can lead to the desired suction result for the user with optimized pushing forces.

• • Vergleichen des bestimmten Unterdrucks mit einem vorbestimmten Unterdruck, und
• • falls der bestimmte Unterdruck kleiner als der vorbestimmte Unterdruck ist, Erhöhen der Leistung des Elektromotors, oder
• • falls der bestimmte Unterdruck größer als der vorbestimmte Unterdruck ist, Reduzieren der Leistung des Elektromotors.

According to one aspect of the present invention, the method has at least the further steps after the determination and before the operation:

• Comparing the determined negative pressure with a predetermined negative pressure, and
• If the determined negative pressure is less than the predetermined negative pressure, increasing the power of the electric motor, or
• If the determined negative pressure is greater than the predetermined negative pressure, reduce the power of the electric motor.

As a result, the output of the blower or its electric motor can be adjusted such that a predetermined negative pressure can be achieved. The output of the electric motor can correspondingly be increased if the determined negative pressure is too low compared to the predetermined negative pressure. Otherwise, the performance of the fan or its electric motor can be increased. Depending on the application, the case that the specific negative pressure is equal to the predetermined negative pressure can lead to an increase or decrease in the power of the electric motor.

• • der ersten Leistung und der ersten Drehzahl oder
• • der ersten Leistung und des ersten Drehmoments oder
• • der ersten Drehzahl und des ersten Drehmoments.

According to one aspect of the present invention, the vacuum is determined in dependence

• • the first power and the first speed or
• • the first power and the first torque or
• • the first speed and the first torque.

This aspect of the present invention is based on the knowledge that the above-mentioned operating parameters of power, speed and torque are recorded in pairs, for example under laboratory conditions, and, for example, as value pairs, for example as a value table. Up-table) can be stored, for example, in a control unit of the vacuum cleaner or in a frequency converter of the electric motor. The volume flow and / or the vacuum can also be stored for each pair of values. If these two operating parameters are now detected or determined when the method according to the invention is being carried out while the vacuum cleaner is operating, a comparison with the stored value pairs can be used to infer the corresponding volume flow or the corresponding negative pressure as described above, so that this value is determined instead of being sensed. Alternatively, such values can also be stored using a mathematical function instead of a table of values.

According to a further aspect of the present invention, the vacuum cleaner has a frequency converter which operates the electric motor, the frequency converter detecting and / or determining a power, a speed and / or a torque of the electric motor. This aspect of the present invention is based on the knowledge that if a frequency converter is used to operate the electric motor of the blower of the vacuum cleaner, it uses or detects the above-mentioned operating parameters anyway, or these can be detected or determined by means of the frequency converter without additional sensors. The above-mentioned power can thus be the actual power of the electric motor, which results from the power control, which is carried out by the frequency converter. The resulting speed of the electric motor can also be determined by the frequency converter and the torque of the electric motor can be calculated from this together with the power. This can be implemented by the frequency converter in each case without additional sensors, in that corresponding information can be stored in the frequency converter. Since a frequency converter for operating the electric motor of the blower is usually present in any case with vacuum cleaners, this can be implemented overall without additional components of the vacuum cleaner. In particular, the same information and knowledge can be obtained from these operating parameters of the frequency converter as from the pressure sensor or pressure switch of the aforementioned DE 10 2016 124 294 A1 .

According to a further aspect of the present invention, the predetermined negative pressure is predetermined such that suction or seizing of the suction nozzle can be avoided at the predetermined negative pressure and when the negative pressure is less than the predetermined negative pressure. It can thus be achieved through this choice of the predetermined negative pressure that the properties and advantages described above with regard to a desired suction result can be realized with the lowest possible energy consumption and at the same time avoiding suction or firm suction. In other words, it can be ensured that the user can guide the suction nozzle over the surface without an uncomfortably high expenditure of force, which would result from suctioning the suction nozzle onto the surface, or at all, which would not be possible with a firm suction. This can make suctioning more comfortable for the user and at the same time lead to the desired suction result with minimal energy consumption.

This can be taken into account by determining the relationships between power, vacuum or volume flow and e.g. Speed in advance at a simultaneously predetermined maximum pushing force, which is on the one hand as high as possible in order to allow the highest possible performance of the blower, but at the same time avoids suction and seizing.

According to a further aspect of the present invention, the predetermined negative pressure corresponds to a predetermined pushing force. In this way, as previously mentioned, the pushing force which a user must apply in order to move the suction nozzle over the surface can also be taken into account in the method according to the invention.

According to a further aspect of the present invention, the steps of operating are carried out continuously until they are operated. As a result, the output of the blower or its electric motor can be continuously adapted to the vacuum present, which is also determined continuously. This can change the boundary conditions of suction, e.g. different substrates are taken into account.

The present invention also relates to a vacuum cleaner system with a vacuum cleaner with a blower, which is designed to generate an air flow, the blower having an electric motor, which is designed to drive an impeller of the blower, and a suction nozzle, which is connected to the vacuum cleaner and is designed to be guided over a surface, wherein the vacuum cleaner is designed to carry out a method as described above. In this way, a vacuum cleaner or a vacuum cleaner system can be created in order to implement and use the properties and advantages of the method according to the invention described above.

• 1 eine seitliche Schnittdarstellung eines erfindungsgemäßen Staubsaugersystems;
• 2 ein Ablaufdiagramm eines erfindungsgemäßen Verfahrens;
• 3 Verläufe verschiedener Betriebsparameter bei einer ersten Leistung; und
• 4 Verläufe verschiedener Betriebsparameter bei einer zweiten Leistung.

An embodiment of the invention is shown purely schematically in the drawings and is described in more detail below. It shows

• 1 a sectional side view of a vacuum cleaner system according to the invention;
• 2nd a flow diagram of a method according to the invention;
• 3rd Profiles of various operating parameters for a first performance; and
• 4th Different operating parameters for a second service.

The 1 is viewed in Cartesian coordinates. It extends in a longitudinal direction X which is also called depth X can be designated. Perpendicular to the longitudinal direction X extends a transverse direction (not shown), which can also be referred to as width. Perpendicular to both the longitudinal direction X as well as the transverse direction extends a vertical direction Z which is also called height Z can be designated.

The 1 shows a side sectional view of a vacuum cleaner system according to the invention 1 . The vacuum cleaner system 1 consists of a vacuum cleaner 10th and other components in the form of a suction hose 16 , a telescopic tube 17th and a suction nozzle 18th . The suction nozzle 18th has a suction opening 19th on which in the operation of the vacuum cleaner system 1 in height Z is directed downward, as will be described in more detail below.

The vacuum cleaner 10th has a housing 11 on the inside of which a blower 12 is arranged. The blower 12 has an impeller 12a on which by means of an electric motor 12b can be rotated to create an air flow A to create. The electric motor 12b can by means of a frequency converter 13 operated and fed with electrical energy, which the frequency converter 13 via a mains connection 14 can be obtained from an electrical supply network, for example via a socket (not shown). Additionally or alternatively, the energy supply can also take place by means of accumulators. Operation of the vacuum cleaner 10th can via a control element 15 eg in the form of an on / off switch 15 influenced or started and ended.

The suction nozzle 18th is designed with its suction opening 19th over an underground 2nd like a surface 2nd eg here in the form of a floor 2nd to be led, which is a flooring 20th having. The flooring 20th is in the representation of the 1 a carpet in the left area 20th , but can also be a smooth floor 21st be (right area of the underground 2nd the 1 ). Because of the airflow A which of the rotating impeller 12a of the blower 12 can create dirt from the flooring 20th through the suction opening 19th the suction nozzle 18th through into the telescopic tube 17th , in the suction hose 16 and in the case 11 of the vacuum cleaner 10th reach. There the dirt can pass through at least one filter from the air flow A be held back so that the airflow A the vacuum cleaner 10th comparatively cleaned can leave again.

The vacuum cleaner 10th or its blower 12 or its electric motor 12b can be operated with different powers, which have a correspondingly stronger or weaker air flow A can generate. A stronger airflow A corresponds to a larger volume flow and a lower vacuum; conversely, a weaker airflow corresponds A a smaller volume flow and a stronger vacuum, see the corresponding measured values and curves of the 3rd and 4th .

The aim is to operate the vacuum cleaner as energy-efficiently as possible 10th the respective floor covering should be done 20th can be vacuumed with the lowest possible power, which is nevertheless sufficient to obtain the desired cleaning result. This can be a smooth floor 21st as flooring 21st can be vacuumed with less power with the same effect as a carpet 20th in which the dirt can adhere to the carpet fibers. Depending on the floor covering, a smooth floor nozzle can also be used 18th as a suction nozzle 18th for smooth floors and a universal floor nozzle for carpets 20th can be used to get the best cleaning result.

At the same time, it should be avoided that the suction nozzle 18th on the underground 2nd can suck or even suck. When sucking in, such a strong negative pressure is generated that the suction nozzle 18th eg by the user only with a force over the surface 2nd can be moved, which is perceived as uncomfortably high by the user. If the vacuum is even stronger, the suction nozzle can 18th even so strongly to the underground 2nd be sucked in that it will suck the suction nozzle 18th on the underground 2nd comes and the suction nozzle 18th eg no longer on the surface by the user 2nd can be moved. It is important to avoid this in each case.

• In einem ersten Schritt erfolgt ein Betreiben 100 des Elektromotors 12b mit einer ersten Leistung. Diese erste Leistung kann ein Startwert des erfindungsgemäßen Verfahrens sein, welche vorbestimmt vorgegeben sein kann. Dieser Wert kann erfahrungsgemäß geeignet sein, die zuvor beschriebenen Anforderungen zu erfüllen. Diese Leistung kann z.B. von einer Steuerungseinheit des Staubsaugers als Soll-Leistung dem Frequenzumrichter 13 vorgegeben werden, welcher dann die Ist-Leistung auf die erste Soll-Leistung regelt, so dass die erste Leistung als am Elektromotor 12b anliegend und damit bekannt angesehen werden kann.

Now becomes a smooth floor nozzle 18th for cleaning a smooth floor 21st used by the user and that of the vacuum cleaner 10th pointing end of the telescopic tube 17th plugged in, optimal energy efficiency with the desired cleaning effect can only be achieved if the performance of the vacuum cleaner 10th or its fan 12 or its electric motor 12b is set accordingly, ie the target power to the frequency converter 13 correspondingly from a control unit (not shown) of the vacuum cleaner 10th is specified. At the same time, suction or even tight suction should be avoided, since this can disturb the user. The control unit can also be a component of the frequency converter 13 the or the functions described and the implementation of the method according to the invention can also be performed by the frequency converter 13 be performed. According to the invention, this can be done as follows:

• In a first step, operation takes place 100 of the electric motor 12b with a first performance. This first output can be a starting value of the method according to the invention, which can be predetermined. Experience has shown that this value can be suitable to meet the requirements described above. This power can, for example, from a control unit of the vacuum cleaner as the target power to the frequency converter 13 be specified, which then regulates the actual power to the first target power, so that the first power than on the electric motor 12b can be viewed close and thus familiar.

Depending on the suction nozzle used 18th as well as the underground 2nd there is an aperture, which in combination with the first power of the electric motor 12b of the blower 12 to an air flow A or leads to a volume flow, which is a negative pressure p on the vacuum side of the blower 12 generated. This results in a first speed q or a first torque of the impeller 12a of the blower 12 or the electric motor 12b of the blower 12 , please refer 3rd and 4th . This first speed q of the electric motor 12b is from the frequency converter 13 about known methods in one step 200 determined and can thus be made available to the control unit.

Because the first power and the first speed q are now known, can be determined in one step 300 a negative pressure p depending on the first power and the first speed q as the operating parameters of the electric motor 12b respectively. For this purpose, for example, the control unit can consider a table of values, which was recorded in advance for the first service and stored in the control unit. The 3rd shows a corresponding value table for a power of approx. 300 W. The 4th shows a corresponding value table for a power of approx. 200 W. There you can find the corresponding value of the first vacuum for the determined first speed p read and made available for further processing. Corresponding sensors, for example in the form of a vacuum sensor or a vacuum switch, can thus be dispensed with.

Now you can compare in one step 400 of the certain negative pressure p with a predetermined negative pressure. The predetermined negative pressure is predetermined such that the predetermined negative pressure and a lower negative pressure p suction or seizing of the suction nozzle as the predetermined negative pressure 18th can be avoided. The predetermined negative pressure corresponds to a predetermined pushing force which, on the one hand, is as large as possible, since this corresponds to the greatest possible negative pressure and thus the best possible suction effect, but on the other hand is still felt, for example, by the user as being pleasant to carry out the suction process. This allows an optimal suction effect with comfortable guidance of the suction nozzle 18th for the user.

When comparing 400 found that the particular negative pressure p is smaller than the predetermined negative pressure, an increase takes place 500a the power of the electric motor 12b . In this way, the suction effect can be increased. When comparing 400 on the other hand found that the particular negative pressure p is greater than the predetermined negative pressure, a reduction takes place 500b the power of the electric motor 12b In order to avoid or to loosen suction or seize, this should already be done.

Operation takes place accordingly in a further step 600 of the electric motor 12b with a second output depending on the determined negative pressure p . This second performance is either greater or less than the first performance, depending on what is being compared 400 was found. This can reduce the performance of the electric motor 12b automatically by the vacuum cleaner 10th or can be adapted by the control unit thereof without the user having to act. Even the performance of the electric motor 12b on the one hand, to be kept as high as possible in order to absorb the dirt as completely and quickly as possible via a correspondingly large suction effect. At the same time, the performance of the electric motor 12b on the other hand, be kept as low as possible in order to adjust the pushing force comfortably for the user and to reduce the energy consumption of the electric motor 12b as well as the noise of the fan 12 to keep as low as possible.

These steps 100 to 600 can now be repeated continuously to determine the power of the electric motor 12b to adapt during the entire suction process as described above and thus to implement the properties and advantages of the method according to the invention described above during the entire suction process. It can also be used to react to changing circumstances such as different surfaces. This everything can be done without the use of a vacuum sensor or a vacuum switch.

Reference symbol list

A

Air flow or flow direction of the air flow

p

vacuum

P1

power

q

rotational speed

X

Longitudinal direction; depth

Z

vertical direction; height

1

Vacuum system

10th

vacuum cleaner

11

casing

12

fan

12a

(Fan) impeller

12b

(Fan) electric motor

13

frequency converter

14

Mains connection

15

Control element; On / off switch

16

Suction hose

17th

Telescopic tube

18th

Suction nozzle; Smooth floor nozzle

19th

Intake opening of the suction nozzle 18th

2nd

Underground; Surface; floor

20th

Flooring; carpet

21st

Flooring; Smooth floor

100

Operate electric motor 12b with first performance

200a

Detect first speed q and / or first torque of the electric motor 12b

200b

Determine first speed q and / or first torque of the electric motor 12b

300

Determine negative pressure p depending on at least two operating parameters

400

Compare certain negative pressure p with a predetermined negative pressure

500a

Increase the power of the electric motor 12b

500b

Reduce the power of the electric motor 12b

600

Operate electric motor 12b with second performance

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102016124294 A1 [0013, 0023, 0029]

Claims (8)

Method of operating a vacuum cleaner system (1) with a vacuum cleaner (10) with a fan (12) which generates an air flow (A), wherein the blower (12) has an electric motor (12b) which drives an impeller (12a) of the blower (12), and with a suction nozzle (18) which is connected to the vacuum cleaner (10) and is guided over a base (2), the procedure with at least the following steps: Operating (100) the electric motor (12b) with a first power, Detecting (200a) or determining (200b) a first speed (q) and / or a first torque of the electric motor (12b), Determining (300) a negative pressure (p) as a function of at least two operating parameters of the first power, the first speed (q) and the first torque of the electric motor (12b), and Operating (600) the electric motor (12b) with a second power depending on the determined negative pressure (p). Procedure according to Claim 1 , characterized by at least the further steps after determining (300) and before operating (600): comparing (400) the determined negative pressure (p) with a predetermined negative pressure, and if the determined negative pressure (p) is less than the predetermined negative pressure , Increasing (500a) the power of the electric motor (12b), or if the determined negative pressure (p) is greater than the predetermined negative pressure, reducing (500b) the power of the electric motor (12b). Procedure according to Claim 1 or 2nd , characterized in that the determination (300) of the negative pressure (p) in dependence on the first power and the first speed (q) or the first power and the first torque or the first speed (q) and the first torque. Method according to one of the preceding claims, characterized by a frequency converter (13) which operates the electric motor (12b), the frequency converter (13) detecting and / or determining a power, a speed and / or a torque of the electric motor (12b). Method according to one of the preceding claims, characterized in that the predetermined negative pressure is predetermined such that suction or seizing of the suction nozzle (18) can be avoided at the predetermined negative pressure and at a lower negative pressure (p) than the predetermined negative pressure. Method according to one of the preceding claims, characterized in that the predetermined negative pressure corresponds to a predetermined pushing force. Method according to one of the preceding claims, characterized in that the steps of operating (100) up to operating (600) are carried out continuously and repeatedly. Vacuum cleaner system (1) with a vacuum cleaner (10) with a fan (12) which is designed to generate an air flow (A), wherein the blower (12) has an electric motor (12b) which is designed to drive an impeller (12a) of the blower (12), and with a suction nozzle (18), which is connected to the vacuum cleaner (10) and designed to be guided over a surface (2), wherein the vacuum cleaner (10) is designed to carry out a method according to one of the preceding claims.

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