Dishwasher and control method therefor

A dishwashing machine comprising:

• at least one spray part configured to spray washing water;
• a vane configured to
• perform a movement along a spray direction of the washing water, and
• deflect the sprayed washing water toward tableware;
• a rack configured to accommodate the tableware to be washed by the washing water deflected by the vane;
• a detection part installed at the vane and configured to detect the tableware accommodated in the rack,
• wherein the at least one spray part includes a linear spray part and the linear spray part includes a left linear spray part having a plurality of spray holes and a right linear spray part having a plurality of spray holes, and
• a controller configured to
• generate position information with respect to the tableware while the vane performs the movement,
• determine whether to spray the washing water through only the left linear spray part, or through only the right linear spray part, or through both the left linear spray part and the right linear spray part, based on the position information, and
• control the movement of the vane based on the position information so as to enable the sprayed washing water to be deflected toward a position at which the tableware is accommodated.