Refrigerator

A refrigerator comprising:

• a cabinet that defines a storage compartment;
• a first door configured to open and close a first side of the storage compartment;
• a second door configured to open and close a second side of the storage compartment;
• a door opening module comprising a motor that is configured to open the first and second doors and that is configured to rotate in a first direction and a second direction opposite to the first direction;
• and
• a controller configured to control rotation of the motor,
• wherein the door opening module further comprises:
• a first rack configured to move toward the first door to open the first door based on rotation of the motor,
• a second rack configured to move toward the second door to open the second door based on rotation of the motor,
• a power transfer device configured to selectively transfer a driving force from the motor to at least one of the first rack or the second rack, the power transfer device comprising a central gear configured to be rotated based on driving of the motor, and a cam configured to rotate about a rotation center of the central gear, and
• a switch configured to be turned on and off based on rotation of the cam,
• wherein the controller is further configured to:
• recognize a rack position of each of the first rack and the second rack based on a state of the switch, and
• based on the rack position of each of the first rack and the second rack, control the motor to rotate in the first direction and then rotate in the second direction such that the first and the second doors are sequentially opened,
• wherein the cam has a first side shape and a second side shape that are different from each other with respect to a reference position at which the cam contacts the switch, and
• wherein the switch is configure to:
• based on the cam rotating from the reference position to a position corresponding to 180° with respect to the reference position in a clockwise direction, change ON-OFF states of the switch according to a first sequence that is defined by the first side shape of the cam, and
• based on the cam rotating from the reference position to the position corresponding to 180° in a counterclockwise direction, change the ON-OFF states of the switch according to a second sequence that is defined by the second side shape of the cam, the second sequence being different from the first sequence.