Air conditioner indoor unit, air conditioner, and method for controlling air conditioner

An air conditioner, comprising:

• an air conditioner indoor unit including:
• a housing having an air inlet, a first air outlet, and a second air outlet arranged below the first air outlet;
• a first door arranged corresponding to the first air outlet and configured to move in a direction parallel to a surface of the first door to open or close the first air outlet;
• an air output door assembly arranged at the second air outlet and connected to the housing, at least a portion of the air output door assembly being configured to move relative to the housing to form an air output channel between the at least a portion of the air output door assembly and the housing, the air output channel having a ring-shaped air output end located in front of the second air outlet, the at least a portion of the air output door assembly including a second door configured to move relative to the second air outlet to open and close the second air outlet;
• an opening-closing mechanism movably mounted at the air output door assembly and configured to open or close an air regulation channel area that includes an upper part of the air output channel;
• and a heat exchanger assembly and an air duct assembly both arranged in the housing;
• and an air conditioner outdoor unit connected to the air conditioner indoor unit;
• wherein a movement direction of the first door relative to the first air outlet is perpendicular to a movement direction of the second door relative to the second air outlet, wherein an area ratio of a projection of the air regulation channel area on a plane perpendicular to a central axis of the second air outlet to a projection of the air output channel on the plane is in a range of 1/10-½.