Air purification apparatus

An air purification apparatus for purifying and discharging polluted air, comprising:

• a first flow path which is a movement path of air;
• a second flow path which is a movement path of the air;
• a main pipe including a first filter positioned between the first flow path and the second flow path and configured to collect at least some of contaminants contained in the air, a first main area positioned between the first flow path and the first filter, and a second main area positioned between the second flow path and the first filter;
• and
• a control unit configured to control the air purification apparatus to operate in the filtering mode or the cleaning mode,
• wherein the air purification apparatus operates in a filtering mode in which at least some of the contaminants contained in the air introduced into the main pipe are collected in the first filter or a cleaning mode in which at least some of the contaminants collected in the first filter in the filtering mode are removed,
• wherein an operation section of the air purification apparatus in the cleaning mode includes a first section and a second section, and the first section and the second section are divided with respect to a first division time point,
• wherein a temperature change rate in the first main area is changed before and after the first division time point, and
• wherein the control unit determines that the cleaning of the air purification apparatus has been started as a temperature of the first main area is higher than a temperature of the second main area, and
• determines that the cleaning of the air purification apparatus has been completed as the temperature of the first main area is lower than the temperature of the second main area.