Mobile machine tool with suction unit and control method

A mobile machine tool for processing a workpiece or a room, the mobile machine tool comprising

• a working device and
• a vacuum generator flow-connected to the working device,
• the working device being mobile with respect to a surface of the workpiece or room to be processed, and
• the vacuum generator being supported on an underlying base surface,
• which working device comprises
• a tool receptacle for a work tool drivable by a drive motor and/or
• a coating device having a coating tool for coating the surface,
• wherein the working device comprises
• a suction device for suctioning the working device onto the surface by means of at least one force component oriented in a normal direction to the surface,
• wherein the suction device has at least one valve for controlling a vacuum intake airflow in a suction region of the working device for suctioning onto the surface, and
• wherein the at least one valve has a valve member which is adjustable between at least two valve positions in which a flow cross-section of the valve is different, and
• wherein the suction device comprises a suction controller for adjusting the valve member during operation of the working device between the valve member valve positions depending on at least one physical variable, and
• wherein the suction controller comprises a position sensor for detecting an angular position of the working device relative to the underlying base surface as the at least one physical variable.