Refrigerator and control method for refrigerator

A refrigerator comprising:

• a cabinet having a storage space;
• a door rotatably coupled to the cabinet and configured to open and close at least a portion of the storage space;
• and
• a door opening device configured to move the door relative to the cabinet,
• wherein the door opening device comprises:
• an upper case and a lower case that are coupled to each other and define a case space therebetween, the lower case comprising a guide protrusion,
• a driving motor comprising a rotating shaft,
• a first gear disposed within the case space and coupled to the rotating shaft,
• a push rod configured to move into and out of the case space,
• a second gear disposed within the case space and configured to transfer power from the first gear to the push rod, and
• an opening device printed circuit board (PCB) configured to control the driving motor, the opening device PCB comprising a first Hall sensor and a second Hall sensor that are configured to detect a position of the push rod, and
• wherein the push rod has:
• a rack defined at a first side surface of the push rod and configured to engage with the second gear,
• a guide groove defined at a lower surface of the push rod and configured to receive the guide protrusion of the lower case,
• a magnet that faces the opening device PCB, and
• a magnet installation part that is disposed at a second side surface of the push rod and accommodates the magnet.