Automatic suction power control device for floor vacuum cleaner, has control circuit for increasing suction power controlled by control loop when signal of pressure sensor reaches lower threshold value

摘要

The device has a pressure sensor (22) i.e. pressure switch, for detecting low pressure in a suction nozzle (8) i.e. electrically driven brush. A control circuit (24) forms a control loop (32) to hold the low pressure below a given value. The control circuit reduces the suction power controlled by a control loop (31) when the signal of the pressure sensor reaches an upper threshold value. The control circuit increases suction power controlled by the control loop (31) when the signal of the pressure sensor reaches a lower threshold value.