Vacuum cleaner with power control in dependence on a mode of operation of an electrical brush
First Claim
1. A vacuum cleaner comprising a housing, a suction unit comprising a vacuum chamber accommodated in the housing and drivable by means of a first electric motor, a suction attachment having a rotatable brush which is adapted to be driven in a mode of operation selected from multiple modes of operation by the user and which is drivable by means of a second electric motor, a control unit for controlling an electric current through the first motor, and means in operative association with said rotatable brush and said control unit for enabling the user to select a mode of operation of the rotatable brush,wherein the current through the first motor is controllable by means of the control unit as a function of the mode of operation of the brush that is selected by a user of the vacuum cleaner, andwherein the control unit comprises means for controlling the current through the first motor in such a manner that an air pressure in the suction attachment does not decrease below a first limit value, a measurement of an air flow in the vacuum cleaner does not exceed a second limit value, and at least one of the two limit values is reached, the control unit determining at least one of the two limit values in dependence upon the mode of operation selected for the brush by the user.
1 Assignment
0 Petitions
Accused Products
Abstract
A vacuum cleaner comprises a suction unit (23) which is drivable by means of a first electric motor (25). A suction attachment (7) of the vacuum cleaner comprises a rotatable brush (41) which is drivable by means of a second electric motor (45). The vacuum cleaner comprises a control unit (29) by means of which an electric current through the first motor (25) can be controlled. In accordance with the invention, the control unit (29) controls the current through the first motor (25) as a function of a mode of operation of the brush (41), which mode can be selected by a user of the vacuum cleaner. In this way, the suction power of the suction unit (23) is adapted to the mode of operation of the brush (41), thereby improving a relationship between cleaning performance, ease of use, current consumption and noise production of the vacuum cleaner. In a special embodiment of a vacuum cleaner in accordance with the invention the control unit (29) controls an air pressure and an air flow in the suction attachment (7) in such a manner that the air pressure does not decrease below a first limit value (HMIN), the air flow does not exceed a second limit value (QMAX), and at least one of the limit values (HMIN, QMAX) is substantially reached.
-
Citations
19 Claims
-
1. A vacuum cleaner comprising a housing, a suction unit comprising a vacuum chamber accommodated in the housing and drivable by means of a first electric motor, a suction attachment having a rotatable brush which is adapted to be driven in a mode of operation selected from multiple modes of operation by the user and which is drivable by means of a second electric motor, a control unit for controlling an electric current through the first motor, and means in operative association with said rotatable brush and said control unit for enabling the user to select a mode of operation of the rotatable brush,
wherein the current through the first motor is controllable by means of the control unit as a function of the mode of operation of the brush that is selected by a user of the vacuum cleaner, and wherein the control unit comprises means for controlling the current through the first motor in such a manner that an air pressure in the suction attachment does not decrease below a first limit value, a measurement of an air flow in the vacuum cleaner does not exceed a second limit value, and at least one of the two limit values is reached, the control unit determining at least one of the two limit values in dependence upon the mode of operation selected for the brush by the user.
Specification