Laundry treatment apparatus and method of controlling the same

1. A method of controlling a laundry treatment apparatus that includes a cabinet including a first opening and a second opening, a first cabinet door that is coupled to the cabinet and that is configured to open or close the first opening, a second cabinet door that is coupled to the cabinet and that is configured to open or close the second opening, a first washing apparatus that is located in the cabinet and that is configured to treat laundry introduced into an interior area of the first washing apparatus through the first cabinet door in a first direction, and a second washing apparatus that is configured to treat laundry introduced into an interior area of the second washing apparatus through the second cabinet door in a second direction, the second washing apparatus including a tub that is accessible through the second opening in a state in which the second cabinet door is opened, that is configured to store water, and that includes a tub opening at a top of the tub, a tub cover that is coupled to the tub, that covers the tub opening, and that includes an introduction port through which laundry is introduced into the interior area of the second washing apparatus, a tub door that is coupled to the tub cover, that is configured to open or close the introduction port, and that is independently operated of the second cabinet door, a drum that is located in the tub and that is configured to rotate about a shaft, the shaft extending in the second direction, a spray unit configured to spray water toward a bottom surface of the drum, and a controller that is configured to control operations of the second washing apparatus, wherein the method comprises:

sequentially performing, by the second washing apparatus, a washing cycle, a rinsing cycle, and a spin-drying cycle;

determining whether bubbles have been generated in the tub during the washing cycle;

during the rinsing cycle, sequentially performing draining washing water from the tub, intermittently spinning the drum to dry laundry using centrifugal force generated by spinning of the drum, supplying wash water to the tub, and rinsing laundry in the tub; and

based on a determination that bubbles have been generated in the tub during the washing cycle, performing, during the rinsing cycle, at least one operation directed to reducing bubbles by spraying water with the spray unit after draining washing water from the tub and before intermittently spinning the drum.

2. The method of claim 1 , wherein performing the at least one operation directed to reducing bubbles comprises (i) adding the at least one operation directed to reducing bubbles in performing the washing cycle, the rinsing cycle, and the spin-drying cycle or (ii) replacing at least one of the washing cycle, the rinsing cycle, or the spin-drying cycle with the at least one operation directed to reducing bubbles.

3. The method of claim 2 , further comprising:

controlling the drum to operate at a first rpm to perform washing in the washing cycle,

wherein performing the at least one operation directed to reducing bubbles comprises controlling the drum to operate at a second rpm that is less than the first rpm.

4. The method of claim 3 , wherein, in a state in which the drum rotates in a first direction at the first rpm, wash water in the tub moves upwardly along an inner circumferential surface of the tub and is introduced into the tub through the introduction port.

5. The method of claim 4 , wherein, in a state in which the drum operates at the second rpm, wash water in the tub does not move.

6. The method of claim 3 , wherein determining whether bubbles have been generated in the tub comprises determining whether bubbles have been generated based on a difference between a level of wash water in the tub in a state in which the drum operates at the first rpm and a reference level of wash water in the tub.

7. The method of claim 6 , further comprising:

controlling the second washing apparatus to operate in the washing cycle for a first time period based on a determination that bubbles have been generated, and

controlling the second washing apparatus to operate in the washing cycle for a second time period based on a determination that bubbles have not been generated,

wherein the first time period is longer than the second time period.

8. The method of claim 1 , wherein performing the at least one operation directed to reducing bubbles includes a bubble reduction pattern comprising:

supplying water, draining water, and rotating the drum simultaneously.

9. The method of claim 8 , wherein the bubble reduction pattern further includes:

waiting, for a third time period, to stop supplying water, draining water, and rotating the drum, and

draining water.

10. The method of claim 8 , further comprising: repeating the bubble reduction pattern.

11. The method of claim 8 , wherein performing the at least one operation directed to reducing bubbles includes a rinsing pattern comprising:

supplying water, rotating the drum, and draining water sequentially.

12. The method of claim 11 , further comprising: performing the bubble reduction pattern before and after the rinsing pattern.

13. The method of claim 12 , further comprising: completing the at least one operation directed to reducing bubbles after the rinsing pattern and the bubble reduction pattern are sequentially performed.

14. The method of claim 3 , further comprising:

controlling the drum to operate at a third rpm to rinse laundry,

wherein, in a state in which the drum operates at the third rpm, wash water in the tub moves upwardly along an inner circumferential surface of the tub and is introduced into the tub through the introduction port to wash a lower surface of the tub door.

15. The method of claim 1 , wherein determining whether bubbles have been generated in the tub is performed during intermittently spinning the drum to dry laundry.

16. The method of claim 15 , further comprising performing, based on a determination that bubbles have been generated, a bubble removal pattern after intermittently spinning the drum, and

wherein the bubble removal pattern includes: supplying water, draining water, and rotating the drum simultaneously.

17. The method of claim 15 , wherein determining whether bubbles have been generated in the tub comprises determining whether bubbles have been generated based on a value of current measured in a motor to drive the drum during intermittently spinning the drum.

18. The method of claim 1 , wherein determining whether bubbles have been generated in the tub comprises determining that bubbles have been generated based on a level of wash water in the tub being greater than a reference level.