Vacuum cleaner control method

A method for controlling a vacuum cleaner, the vacuum cleaner including a suctioning portion;

• a fan motor for generating a suction force for sucking air along the suctioning portion;
• a first nozzle including a first nozzle body connected to or removed from the suctioning portion, and a first nozzle driver accommodated in the first nozzle body for providing power to remove dusts;
• a second nozzle including a second nozzle body connected to or removed from the suctioning portion, and a second nozzle driver accommodated in the second nozzle body for providing power to remove dusts;
• and a measuring device for measuring a current value based on a control signal applied to the first nozzle or the second nozzle, wherein one of the first nozzle and the second nozzle is connected to the suctioning portion in an exchangeable manner from each other, the method comprises:
• a removal sensing operation of measuring the current value in one of the first nozzle and the second nozzle being driven in connection with the suctioning portion, and sensing, based on the current value, whether said one of the first nozzle and the second nozzle has been removed from the suctioning portion;
• and
• a re-connection sensing operation of sensing whether one of the first nozzle and the second nozzle has been re-connected to the suctioning portion after said one of the first nozzle and the second nozzle has removed therefrom,
• wherein the removal sensing operation includes:
• comparing the current value after being sampled during a preset first sampling period with a preset first allowable value;
• and
• sensing whether said one of the first nozzle and the second nozzle has been removed from the suctioning portion within a preset removal sensing duration from a first measurement time when the current value starts to decrease to a value to be equal to or lower than the first allowable value, and
• wherein the re-connection sensing operation includes:
• comparing a current value measured after being sampled during a preset second sampling period shorter than the first sampling period, after said one of the first nozzle and the second nozzle is re-connected to the suctioning portion with a preset second allowable value;
• determining that the measured current value is equal to or less than the second allowable value at least once, and in response to the determination that the measured current value is equal to or less than the second allowable value, proceeding to an operation maintaining operation of continuously applying the control signal and continuously operating the fan motor without stopping;
• and
• determining that the measured current value exceeds the second allowable value at least once, and in response to the determination that the measured current value exceeds the second allowable value:
• stopping application of the control signal for a preset first delay time, and performing a control signal re-applying operation and a nozzle distinguishing operation,
• wherein the control signal re-applying operation includes re-applying the control signal after the first delay time has elapsed, and starting to measure the current value during the first sampling period, and
• wherein the nozzle distinguishing operation includes sensing which nozzle among the first and second nozzle is said one of the first nozzle and the second nozzle re-connected to the suctioning portion, and selecting and performing an operation of the fan motor or the connected nozzle based on the sensing result.