Vacuum cleaner and method for operating a vacuum cleaner

A vacuum cleaner for cleaning a surface, the vacuum cleaner comprising:

• a body;
• an electrically-driven suction unit;
• a device for collecting dust;
• a suction channel;
• a nozzle fluidically communicating with said body through said suction channel;
• an intake device having a by-pass channel, said intake device fluidically communicating with said suction unit, being configured for ensuring feeding of an additional portion of air into said suction channel, and configured to be adjusted between an opened state and a closed state for opening and closing said by-pass channel;
• a control unit configured to control said suction unit, said control unit having a processor for storing, calculating and interpreting signals or data;
• a starting and stopping device being operated by a user, electrically communicating with said control unit and configured to generate a cleaning start signal or a cleaning end signal;
• said intake device being bi-directionally electrically connected to said control unit for enabling transmission of data or signals between said intake device and said control unit;
• said control unit being configured to generate a signal for controlling said intake device upon detecting the cleaning start signal or the cleaning end signal;
• said starting and stopping device being configured to detect a cleaning end signal generated by a user's change of state of said starting and stopping device from an on position to an off position;
• said control unit detecting said cleaning end signal and, in response to said cleaning end signal, said control unit generating a signal to change said intake device from said closed state to said opened state, thereby opening said by-pass channel to allow the additional portion of air to be drawn into said suction channel;
• and
• said control unit being configured to subsequently control said suction unit to continue operation for a predetermined time to remove dust particles from said suction channel before switching off said suction unit.