BE1029184B1 - Procedure for operating a cordless vacuum cleaner - Google Patents

Abstract

The present application relates to a method for operating a battery-powered vacuum cleaner (1, 1'), comprising the following method steps: - When the battery-powered vacuum cleaner (1, 1') is switched on, in which the suction fan is activated and consequently at the suction opening (9) a suction air flow is generated, the suction opening (9) is guided over the surface (2, 2') for the purpose of cleaning a surface (2, 2'); - In the switched-on state, the brush motor is at least temporarily in a functional state, so that dirt particles located on the surface (2, 2') are mobilized, caught by the suction air flow and guided into the separating system; - If an unintentional blockage of the electric brush occurs, the brush motor is switched off by means of the controller and in this way transferred to a blocked state in which the electric brush stands still; In order to provide a method which makes it easier to overcome the blocked state of the brush motor when the battery-powered vacuum cleaner is switched on, the invention provides that the at least one acceleration sensor is used to collect data relating to a position and/or acceleration of at least one part of the battery-powered vacuum cleaner (1, 1') in the room and sent to the controller, whereby if the battery-powered vacuum cleaner (1, 1') is in a defined acceleration state and/or in a defined acknowledgment position, the blockage state of the brush motor is automatically acknowledged by the controller and the brush motor reacts again or further continuous use of the cordless vacuum cleaner (1, 1') can be converted back into the functional state. The invention also relates to a cordless vacuum cleaner.

Description

The invention relates to a method for operating a battery-powered vacuum cleaner according to the preamble of claim 1. The present application also relates to a battery-powered vacuum cleaner according to the preamble of claim 6. The battery-powered vacuum cleaner comprises a suction tube and a housing located on the suction tube.

At least one rechargeable battery, one suction fan and one separating system are arranged in the housing.

A floor nozzle is located at an end of the suction tube facing a surface, the floor nozzle having a suction opening for picking up dirt particles from the surface.

An opening plane spanned by the suction opening is typically arranged parallel to a surface plane spanned by the surface.

Battery-powered vacuum cleaners within the meaning of the present application are suitable for cleaning surfaces, such battery-powered vacuum cleaners typically being characterized in that they are held as a whole by a user during the cleaning process, with the suction opening being guided over the surface to be cleaned.

This means that the user holds the suction pipe, preferably by a handle, and thus also carries the housing.

Accordingly, you don't have to drag a housing that is guided on the ground by means of wheels, as is the case with conventional vacuum cleaners.

The battery enables cordless cleaning of the surface, so that the socket does not have to be changed regularly during a cleaning process.

A suction air flow is generated by means of the suction fan, which sucks dirt particles in the direction of the suction opening, introduces them into the floor nozzle and accordingly into the suction pipe and feeds them to the separating system.

The separation system is used to collect dirt particles.

Typically, the separation system includes a removable container that can be emptied accordingly.

An embodiment of the separation system as a cyclone separator is also conceivable.

The floor nozzle and the suction tube are connected to one another by means of a joint, preferably at least one rotary joint or a ball joint.

The joint causes the suction tube to be pivotably mounted relative to the floor nozzle about at least one horizontal joint axis, preferably at least two horizontal joint axes.

It is conceivable that the suction tube and the floor nozzle are connected to one another by means of two rotary joints which together form a universal joint.

In such a configuration, the suction tube is consequently mounted such that it can pivot about two horizontal joint axes relative to the floor nozzle, with the two horizontal joint axes preferably being arranged perpendicular to one another. Using the swivel joints, the cordless vacuum cleaner can be steered into areas that would otherwise be difficult to access or could be reached by lifting and repositioning the cordless vacuum cleaner. Due to the pivotability of the suction tube relative to the floor nozzle, an angle between a longitudinal axis of the suction tube and a projection axis of the longitudinal axis of the suction tube projected perpendicularly onto the surface can be changed during the suction process. An electric brush is mounted on the floor nozzle, wherein the electric brush can be driven in rotation about its brush longitudinal axis by means of an electric brush motor. A brush longitudinal axis of the electric brush, around which the electric brush can be driven in rotation, is typically arranged parallel to the opening plane of the suction opening. The rotating movement of the electric brush should further increase the transport of dirt particles through the suction opening. The brush motor is preferably arranged in the floor nozzle.

The cordless vacuum cleaner also includes at least one acceleration sensor, with data measured by the acceleration sensor being sent to a controller and processed by the controller. The controller is used to control operating functions of the battery-powered vacuum cleaner, these operating functions relating, for example, to switching the battery-powered vacuum cleaner on and off and/or switching the brush motor on and off.

When the cordless vacuum cleaner is switched on, the suction fan generates a flow of suction air that acts on the suction opening. The suction air flow now means that at least the areas of the surface immediately below the suction opening and/or areas close to the suction opening are freed from dirt particles by a movement of the battery-powered vacuum cleaner. The dirt particles are transported through the floor nozzle and the subsequent suction pipe into the separation system. Furthermore, when the cordless vacuum cleaner is switched on, the brush motor is at least temporarily in a functional state in which the electric brush is driven in rotation about its brush longitudinal axis. As a result, dirt particles in the areas over which the suction opening is guided are additionally moved in the direction of the suction opening with the help of the electric brush. This increases the cleaning performance of the cordless vacuum cleaner.

If the electric brush is blocked by an object, the brush motor is switched to a blocked state in which the brush motor switches off and the electric brush accordingly no longer rotates about its brush longitudinal axis. This switch-off mechanism of the brush motor initially brings with it the advantage that it can be prevented that objects which are sucked in and which are comparatively large possibly clog the suction tube. Furthermore, damage to the electric brush and/or the brush motor is avoided. After the blocking object has been removed, the brush motor can be brought back into a functional state, so that the rotation of the electric brush about its brush longitudinal axis is reactivated. In the prior art, the transfer of the electric brush from the blocked state back to the functional state can be accomplished in particular by switching the cordless vacuum cleaner from its switched-on state to its switched-off state and back to the switched-on state, for example by actuating the on/off switch -switch.

It has been found that the brush motor will occasionally turn off the Electrobrush unintentionally when the Electrobrush encounters unintended blockages. These unintentional blockages represent areas that should be vacuumed, but which act like a blockage on the electric brush. High edges on carpets or high-pile carpets are examples of unintentional blockages. It happens again and again that with these unintentional blockages too much resistance acts on the electric brush, so that the brush motor recognizes these unintentional blockages as real blockages and consequently switches itself off. If the electric brush is blocked by such an unintentional blockage, the suction result may be unsatisfactory.

Furthermore, higher pushing forces have to be applied in order to actuate the cordless vacuum cleaner. In order to overcome the blockage state of the brush motor, the battery-powered vacuum cleaner according to the prior art must be switched from its switched-on state to its switched-off state before the battery-powered vacuum cleaner—and with it the brush motor—are then switched on again.

However, switching the cordless vacuum cleaner on and off to (re)activate the electric brush has proven to be time-consuming and therefore represents a disruptive factor for the user that should not be underestimated.

The present application is therefore based on the object of providing a method for operating a battery-powered vacuum cleaner and a battery-powered vacuum cleaner which enable simplified operation for the user of the battery-powered vacuum cleaner.

The underlying object is achieved according to the invention by means of a method for operating a cordless vacuum cleaner with the features of claim 1. Advantageous refinements result from the associated subclaims.

The method according to the invention is characterized in that data relating to a position and/or acceleration of at least part of the battery-powered vacuum cleaner in space is recorded by means of the at least one acceleration sensor and is sent to the controller. If the cordless vacuum cleaner is in a defined acceleration state, the blockage state of the brush motor is automatically acknowledged by the controller. Alternatively, it is conceivable that an acknowledgment of the blockage state is acknowledged by the controller adopting a defined acknowledgment position. The result of this is that the brush motor is switched back to the functional state when the battery-powered vacuum cleaner is used again or for a longer period of time. Switching off and then switching on the cordless vacuum cleaner is then no longer necessary to restore the function of the electric brush.

According to the present application, the functional state of the brush motor provides that the brush motor rotates the electric brush along its brush longitudinal axis. In a blocked state, the brush motor is switched off and the electric brush stands still, although the battery-powered vacuum cleaner is in a switched-on state.

For the purposes of the present application, an “acknowledgment” is understood to mean that the controller removes a (typically electronic) lock on the brush motor, whereupon the latter can be switched back to the functional state manually or is automatically switched to the functional state.

Within the meaning of the present application, the acknowledgment position describes at least one part of the battery-powered vacuum cleaner, a position of the battery-powered vacuum cleaner in space. In particular, an acknowledgment position can be defined in that a longitudinal axis of the suction pipe intersecting the surface to be cleaned and a vertical projection of the longitudinal axis of the suction pipe onto the surface (“projection axis”) together enclose a specific angle. In this case, the projection axis is arranged within a surface plane spanned by the surface. Said angle can be changed due to the at least one joint that connects the floor nozzle and the suction pipe to one another, with the longitudinal axis of the suction pipe rotating about at least one horizontal joint axis of the joint.

The "acknowledgment position" here describes a position of the battery-powered vacuum cleaner in the room into which the battery-powered vacuum cleaner must be transferred by its user in order to acknowledge the blockage state. This means that the at least one acceleration sensor detects the position of at least part of the cordless vacuum cleaner in space. This recorded data relating to the position is forwarded to the controller. The controller compares the recorded data with the defined acknowledgment position. If the current position of the cordless vacuum cleaner corresponds to the defined acknowledgment position, the controller forwards a corresponding output signal to the brush motor so that it can be switched on again manually or switched on again automatically.

For the purposes of the present application, the defined acceleration state describes a fixed acceleration value at at least one measuring point of the battery-powered vacuum cleaner while the battery-powered vacuum cleaner is switched on. 5 This means that the at least one acceleration sensor detects the acceleration of at least part of the cordless vacuum cleaner in space.

This recorded data relating to the acceleration is forwarded to the controller.

The controller compares the recorded data with the defined acceleration status and forwards the corresponding output signals to the brush motor.

The blockage state is acknowledged by the controller when the recorded data are identical to the defined acceleration state or are within a corresponding range.

A signal is forwarded from the controller to the brush motor so that it is brought back into the functional state.

It is conceivable that both a specific acknowledgment position and a specific acceleration state are only defined as necessary conditions for an acknowledgment, but not as sufficient conditions.

It is thus conceivable, for example, that to acknowledge the blockage state, the cordless vacuum cleaner must assume a specific acknowledgment position and remain in this acknowledgment position for at least an acknowledgment period of time so that the acknowledgment is triggered.

In this embodiment, a dynamic “passing through” of the acknowledgment position is therefore not sufficient to bring about the acknowledgment.

The invention brings many advantages.

Due to the defined acceleration state and/or the defined acknowledgment position and the associated automatic acknowledgment of the blockage state, it is not necessary to press the on/off switch on the cordless vacuum cleaner in order to put the electric brush back into operation after it has been switched off.

Instead, a user can already acknowledge the blockage state and bring about the transfer of the brush motor to the functional state with just a specific movement and/or a short standstill of the cordless vacuum cleaner.

At best, the brush motor can therefore be switched on with a certain movement, without having to actuate any switches.

The cordless vacuum cleaner can preferably simply be attached to its

handle to be held.

Changing your grip or adding a second hand is at best not necessary.

It is advantageously provided that a position of the cordless vacuum cleaner is defined as the acknowledgment position in which a longitudinal axis of the suction pipe is at a certain angle to a projection axis.

The projection axis describes a vertical projection of the longitudinal axis of the intake manifold onto the surface.

The fictitious axis formed in this way is referred to as the "projection axis".

The acknowledgment position is reached when an angle between the longitudinal axis of the intake manifold and the projection axis is greater than 80° or less than 25°. Projection is typically described as the enlarged, reduced or otherwise modified transmission of an image onto a projection surface. In terms of the present application, the projection surface is formed by the surface to be cleaned. The longitudinal axis of the intake manifold intersects the surface. It is conceivable that the cordless vacuum cleaner is in the acknowledgment position in what is known as a “self-standing” position, in which the angle between the projection axis and the longitudinal axis of the suction tube is greater than 80°, preferably 90°. It is also conceivable that the longitudinal axis of the suction pipe is arranged at an angle of less than 25° to the projection axis when the cordless vacuum cleaner is in the acknowledgment position, it also being conceivable for the cordless vacuum cleaner to be placed on the surface so that the longitudinal axis of the suction pipe is at least essentially parallel to one of the surface spanned surface plane is arranged and the angle between the intake manifold longitudinal axis and the projection axis is correspondingly close to 0 °. In this position, it would be easier to remove an object that is actually blocking.

Alternatively, it is preferably provided that at least one defined acceleration state, in the presence of which the acknowledgment of the blockage state can be triggered, is defined in that at least one measuring point of the cordless vacuum cleaner, at which the at least one acceleration sensor is arranged, stands still in the room for an acknowledgment period . This means that there is no appreciable acceleration at the at least one measuring point of the cordless vacuum cleaner over a defined acknowledgment period of, for example, three seconds, preferably of at most one second. The way in which the cordless vacuum cleaner is arranged in the room preferably plays no role here, but can also be used in combination for the evaluation.

The global acceleration value determined by the at least one acceleration sensor is advantageously less than at least at the measuring point of the cordless vacuum cleaner

9.80665 m/s?. The values of the acceleration sensor are preferably between 0 and 1g, ie between 0 and 9.80665 m/s?. The defined acceleration value preferably approaches zero. This means that the cordless vacuum cleaner is preferably not moved and its position in space remains the same.

Alternatively, it is also conceivable that the defined acceleration state describes a deliberately executed rapid movement of at least part of the cordless vacuum cleaner in space, in particular along the arc spanned by the longitudinal axis of the suction tube and the axis of projection. This means that an angle change between the longitudinal axis of the intake manifold and the projection axis can be carried out particularly quickly in order to achieve the defined acceleration state. The determined acceleration value at least at the

Measuring point of the cordless vacuum cleaner is then greater than 9.80665 m/s?. When such an acceleration value occurs, the defined acceleration state is reached, whereupon the controller acknowledges the blocked state of the electric brush. An advantageous further development of the method according to the invention provides that the controller only acknowledges the blocked state of the brush motor if the battery-powered vacuum cleaner is in the defined acknowledgment position for an acknowledgment period in an acceleration state, in which at least one measuring point of the battery-powered vacuum cleaner at which the at least one acceleration sensor is arranged is standing still in the room. This means that the cordless vacuum cleaner is deliberately moved to a position that represents a defined acknowledgment position and is kept there (steady) for the acknowledgment period. The “self-standing” position is again given as an example here, in which the angle between the longitudinal axis of the suction tube and the axis of projection is at least essentially 90°, and in which the battery-powered vacuum cleaner can preferably stand on its own. A defined acknowledgment position has the advantage that no acknowledgment occurs if the cordless vacuum cleaner is held in a different position for other reasons over the acknowledgment period. It can thus be prevented that the user does not recognize an intended blockage state because he is distracted for other reasons. An unintentional acknowledgment is thus avoided.

It is also conceivable that at least two different acknowledgment positions and/or acceleration states are permitted in order to acknowledge the blockage state. This allows the user to choose the type of acknowledgment that is most convenient for them.

The underlying object is also achieved by means of a battery-powered vacuum cleaner for cleaning a surface according to the features of claim 6. An advantageous embodiment of the cordless vacuum cleaner results from dependent claim 7.

The battery-powered vacuum cleaner according to the invention is characterized in that the controller is set up to automatically acknowledge a blockage state of the brush motor when the battery-powered vacuum cleaner is transferred to a defined acknowledgment position and/or when the battery-powered vacuum cleaner is in a defined acceleration state, and to switch off the brush motor if it is used again or for a longer period of time of the cordless vacuum cleaner to the functional state.

This results in the previously mentioned advantages that a time saving can be achieved when transferring the brush motor from the blocked state to the functional state. In addition, the action to be taken to acknowledge the blockage state can be simplified.

According to an advantageous further development of the cordless vacuum cleaner, it is provided according to the invention that the acceleration sensor is arranged on a battery management system, preferably the battery. This central arrangement of the acceleration sensor on the battery management system, which is advantageously arranged in the housing, enables the acknowledgment position and/or the acceleration state to be recorded precisely, since the battery management system is typically arranged on the suction pipe and thus movements of the Cordless vacuum cleaner can be measured in any case on the battery management system. Furthermore, the acceleration sensor is preferably arranged in such a way that it cannot be accidentally removed or destroyed.

In particular, the cordless vacuum cleaner can have a plurality of acceleration sensors, preferably three acceleration sensors, which are suitable for measuring accelerations in space in directions that are linearly independent of one another. Embodiments of the invention are shown purely schematically in the drawings and are described in more detail below. Shown are: Figure 1 Side view of a cordless vacuum cleaner according to the invention in its switched-on state, Figure 2 Side view of the vacuum cleaner according to the invention according to Figure 1, with a brush motor being in a blocked state, Figure 3 Schematic representation of the method according to the invention, and Figure 4 Side view of a cordless vacuum cleaner according to the invention in a switched-on state with a brushed motor in a stalled state.

A cordless vacuum cleaner 1 shown in Figure 1 for cleaning a surface 2 comprises a suction tube 3, a housing 4 and a floor nozzle 6 arranged on an end 5 of the suction tube 3 facing the surface 2. On an end 5 of the suction tube 3 facing away from the surface 2 a handle 7 is arranged, by means of which an opening plane 8 of a suction opening 9 of the cordless vacuum cleaner 1 is pushed by a user approximately parallel over the surface 2 to be cleaned.

The floor nozzle 6 is attached to the suction tube 3 by means of a joint 10 in the form of a universal joint. A first pivot joint of joint 10 allows the suction tube 3 to move relative to the floor nozzle 6 about a first horizontal joint axis 11, and the second pivot joint allows the suction tube 3 to move relative to the floor nozzle 6 about a second horizontal joint axis 12, with the first Joint axis 11 and the second joint axis 12 are arranged perpendicular to one another. Advantageously, the first joint axis 11 is arranged parallel to a frontal plane of a user, not shown here. Correspondingly, the second joint axis 12 is arranged perpendicular to the frontal plane of the user. Because of the joint 10, an angle 13 between a longitudinal axis 14 of the suction pipe 3 and a projection axis 15 formed by a vertical projection of the longitudinal axis 14 of the suction pipe on the surface 2 can be changed as desired. The floor nozzle 6 has the suction opening 9 through which dirt particles are guided when the cordless vacuum cleaner 1 is switched on. The opening plane 8 spanned by the suction opening 9 is arranged at least approximately parallel to a surface plane 16 spanned by the surface 2 to be cleaned. An electric brush, not shown here, is arranged in the suction opening 9 and is rotated about its brush longitudinal axis by a brush motor, not shown here. The longitudinal axis of the brush of the electric brush is arranged approximately parallel to the opening plane 8 of the suction opening 9 . The housing 4 is arranged on the suction pipe 3 in a lower subregion 17 of the suction pipe 3 facing the surface 2 to be cleaned. The housing 2 includes a separation system, an exhaust fan and a battery. A suction air flow can be generated by means of the suction fan, which transports the dirt particles located on the surface 2 through the suction opening 9 via the floor nozzle 6 and the subsequent suction pipe 3 into the separation system and collects them there.

The battery provides energy to operate the cordless vacuum cleaner 1 wirelessly. Acceleration sensors, which are not shown here, are arranged on or on the battery and record data relating to a position of the suction tube relative to the floor nozzle. These are three acceleration sensors, each of which is aligned perpendicular to one another. The data from the acceleration sensors are forwarded to a controller located in the housing 2 .

The cordless vacuum cleaner 1 according to FIG. 1 is in a switched-on state. In the switched-on state, the suction fan generates the suction air flow and the suction opening 9 is guided over the surface to be cleaned by the user, who preferably holds the handle in his hand. The angle 13 between the longitudinal axis 14 of the suction pipe and the axis of projection 15 is typically between 25° and 80° when the battery-powered vacuum cleaner is switched on. When the cordless vacuum cleaner 1 is switched on, the brush motor is at least temporarily in a functional state in which it drives the electric brush to rotate about its brush longitudinal axis. However, if the electric brush encounters an unintentional or intentional blockage, the brush motor is switched to its blocked state, in which the brush motor stops the rotary movement of the electric brush. A repeated start-up of the brush motor is then initially blocked by the control in order to avoid possible damage to the brush motor and/or electric brush, which could be caused by the respective cause of the blockage. The battery-powered vacuum cleaner 1 is still in a switched-on state. In particular, when the cordless vacuum cleaner 1 encounters an unintentional blockage, it is desirable to be able to easily transfer the brush motor from its blocked state to its functional state. In order to now turn on the brush motor, the cordless vacuum cleaner 1 is transferred into its acknowledgment position shown in FIG. In this case, the acknowledgment position is a “self-standing” position of the battery-powered vacuum cleaner 1, in which the battery-powered vacuum cleaner can be placed independently, ie without having to be held by hand, without falling over. The switched off brush motor and thus a standstill of the electric brush is acknowledged by the controller as soon as the acknowledgment position is reached and the cordless vacuum cleaner remains in this acknowledgment position for an acknowledgment period. The acknowledgment period is 1 second here, for example. If the cordless vacuum cleaner is now moved out of the acknowledgment position again, the brush motor switches on again, whereupon the electric brush rotates again about its brush longitudinal axis.

Alternatively or additionally, it is also conceivable that such a position of the cordless vacuum cleaner 1 is defined as the acknowledgment position in which the angle 13 between the longitudinal axis 14 of the suction tube and the axis of projection 15 is less than 25°. This means that the cordless vacuum cleaner 1 is transferred into an approximately lying position. Such an acknowledgment position is not shown here in the figures.

FIG. 3 shows a schematic representation of the method according to the invention of a battery-powered vacuum cleaner according to FIG. If the cordless vacuum cleaner 1 encounters a blockage, the _brush motor is switched off. The cordless vacuum cleaner 1 is moved into the “self-standing” position by its user. The acceleration sensors detect when the cordless vacuum cleaner 1 is moved into the “self-standing” position. As a result, the controller acknowledges the blocked status of the brush motor. If the cordless vacuum cleaner 1 now leaves its "self-standing" position, the brush motor is returned to its functional state.

FIG. 4 shows a cordless vacuum cleaner 1 on which the housing 4' is located in an upper region 18 of the suction tube 3', facing away from the surface 2. The cordless vacuum cleaner 1' is in a switched-on state in which a suction air flow is generated by the suction fan. In this exemplary embodiment, the cordless vacuum cleaner 1' is not, as in the previously illustrated exemplary embodiment, transferred to an acknowledgment position in which the angle 13 between the longitudinal axis 14 of the suction pipe and the projection axis 15 is more than 80° or less than 25°. Instead, it is envisaged that one of the

Acceleration sensors globally determined acceleration value of the battery-powered vacuum cleaner 1' along an arc 19 spanned by the longitudinal axis 14' of the suction tube and the projection axis 15' approaches zero at least at the measuring point of the battery-powered vacuum cleaner 1'.

If the acceleration value remains at zero for an acknowledgment period of here 1 second, i.e. the angle 13° between the longitudinal axis of the intake manifold 14' and the projection axis 15° remains constant, the blocked status of the brush motor is acknowledged by the controller and the controller transmits a signal to the Brush motor so that it switches back to the functional state.

List of reference symbols 1, 1° cordless vacuum cleaner 2,2' surface 3, 3 suction tube 44 housing

5 End 6 Floor nozzle 7 Handle 8 Opening level

9 suction opening 10 joint 11 joint axis 12 joint axis 13, 13° angle

14, 14 intake manifold longitudinal axis 15, 15° projection axis 16 surface plane 17 lower area 18 upper area

19 arches

Claims (7)

patent claims 1. Method for operating a battery-powered vacuum cleaner (1, 1°), the battery-powered vacuum cleaner (1, 1') comprising - a suction pipe (3, 3°), - a housing (4, 4th) arranged on the suction pipe (3, 3°). %), in which a rechargeable battery, a suction fan for generating a suction air flow and a separating system for collecting dirt particles are arranged, - a floor nozzle (6) which is arranged at one end (5) of the suction pipe (3, 3'), wherein the floor nozzle (6) has a suction opening (9) for picking up dirt particles from a surface (2, 2'), - at least one joint (10) by means of which the suction tube (3, 3°) can be rotated relative to the floor nozzle (6) is pivotably mounted about at least one horizontal joint axis (11), - an electric brush assigned to the suction opening (9), - a brush motor, by means of which the electric brush can be driven in rotation about its brush longitudinal axis, - at least one on the suction pipe (3, 3') and/ or the housing (4, 4%) arranged accelerometer and — a controller for controlling operation Functions of the cordless vacuum cleaner (1, 1'), the method comprising the following method steps: - When the cordless vacuum cleaner (1, 1') is switched on, in which the suction fan is activated and as a result a suction air flow is generated at the suction opening (9), the suction opening (9) is guided over a surface (2, 2°) for the purpose of cleaning it; - In the switched-on state, the brush motor is at least temporarily in a functional state in which the brush motor is active, so that the electric brush is driven in rotation and dirt particles on the surface (2.2%) are mobilized, captured by the suction air flow and fed into the separating system to be led; - In the event of an unintentional blockage of the electric brush, the brush motor is switched off by the control and in this way transferred to a blocked state in which the electric brush stands still: characterized by the following method step: - Using the at least one acceleration sensor, data relating to a position and/or acceleration of at least part of the battery-powered vacuum cleaner (1, 1°) in space is recorded and sent to the controller, wherein - at least if the brush motor is in its If the battery-powered vacuum cleaner (1, 1°) is in a defined acceleration state and/or in a defined acknowledgment position, the blockage state is automatically acknowledged by the controller and the brush motor returns to when the battery-powered vacuum cleaner (1, 1°) is used again or for a longer period of time be transferred to its functional status. 2. The method according to claim 1, characterized in that a position of the cordless vacuum cleaner (1) is defined as the acknowledgment position, in which a projection axis (15) from a projection of a suction tube longitudinal axis (14) of the suction tube (3) perpendicular to the surface ( 2) is formed, encloses an angle (13) of greater than 80° or less than 25° with the longitudinal axis (14) of the intake manifold. 3. The method according to any one of the preceding claims, characterized in that at least one acceleration state, in the presence of which the acknowledgment of the blockage state can be triggered, is defined in that at least one measuring point of the cordless vacuum cleaner (1°) at which the at least one acceleration sensor is arranged is standing quietly in the room for an acknowledgment period. 4. The method according to claim 3, characterized in that a global acceleration value determined by the at least one acceleration sensor is less than 9.80665 m/s at least at the measuring point of the cordless vacuum cleaner (1). is. 5. The method according to any one of the preceding claims, characterized in that the controller only acknowledges the blockage state of the brush motor when the battery-powered vacuum cleaner (1°) is in a defined acknowledgment position over an acknowledgment period in an acceleration state in which at least one measuring point of the battery-powered vacuum cleaner ( 1'), on which the at least one acceleration sensor is arranged, stands still in space. 6. Cordless vacuum cleaner (1, 1') for cleaning a surface (2, 2%) of a room, comprising - a suction pipe (3, 3°), - a housing (4, 4) arranged on the suction pipe (3, 3°), in which a rechargeable battery, a suction fan for generating a suction air flow and a separating system for collecting dirt particles are arranged, - a floor nozzle (6), which is attached to an is arranged at one end 5 of the suction tube (3, 3%), with the floor nozzle (6) having a suction opening (9) for receiving protective particles from a surface (2, 2'), - at least one joint (10), by means of which the suction tube (3, 3°) relative to the floor nozzle (6) is pivotably mounted about a horizontal joint axis (11), - an electric brush assigned to the suction opening (9), - a brush motor, by means of which the electric brush can be driven in rotation about its brush longitudinal axis, - at least one acceleration sensor arranged on the suction tube and/or the housing (4, 4), - a controller for controlling operating functions of the battery-powered vacuum cleaner, characterized in that - the controller is set up to, when the battery-powered vacuum cleaner (1, 1° ) to a defined acknowledgment position and/or if the battery-powered vacuum cleaner (1, 1°) is in a defined acceleration state, to automatically acknowledge a blockage state of the brush motor and to switch the brush motor to a functional state if the battery-powered vacuum cleaner (1, 1°) is used again or for a longer period of time convict. 7. Cordless vacuum cleaner (1, 1') according to claim 6, characterized in that the acceleration sensor is arranged on a battery management system, preferably on the battery.