Patent ID: 8776307

Claim:
An air volume flow and pushing force control device for a vacuum cleaner that has at least a motor, a dust receptacle and a suction nozzle, comprising: a controller for controlling the motor power; a first sensor, for detecting the air volume flow, which in conjunction with the controller forms a first control loop, such that when the first control loop is activated, the controller produces a motor control signal in accordance with a signal from the first sensor in order to maintain the air volume flow at a prescribed air volume flow value; a second sensor for detecting a pushing force that is required to push the suction nozzle and, in conjunction with the controller, forms a second control loop, such that when the second control loop is activated, the controller produces a motor control signal in accordance with a signal from the second sensor in order to maintain the pushing force below a prescribed value, wherein the second sensor is a force sensor that measures the pushing force action on the suction nozzle; and a control loop selection device that activates only one of the first and second control loops at a time as a function of the signals from the first and second sensors, such that said controller produces the motor control signal to control said motor power only in accordance with the signal from the sensor in the activated control loop.