Laundry treating machine and control method for the same

Abstract

Embodiments of the present disclosure relate to a control method for a laundry treating machine comprising a first drum rotating step that is configured to rotate the drum at a preset reference RPM; a first water discharging step that is configured to rotate the impeller at a preset first water discharge RPM during the first drum rotating step; a second drum rotating step that is configured to rotate the drum at a first drum RPM lower than the reference RPM; a second water discharging step that is configured to rotate the impeller at a second water discharge RPM lower than the first water discharge RPM during the second drum rotating step, wherein a water level inside the first discharge pipe is kept on being higher than the highest water level inside the housing, while the first water discharging step and the second water discharging steps are performed.

What is claimed is: 
     
         1 . A method for controlling a laundry treating machine, wherein the laundry treating machine comprises:
 a cabinet;   a tub mounted in a cabinet and configured to receive water;   a drum rotatably mounted in the tub and configured to hold laundry;   a housing configured to receive water;   an impeller rotatably supported in the housing; and   a discharge pipe configured to guide the water in the tub toward the housing, the method comprising:   rotating the drum at a preset reference revolutions per minute (RPM);   while rotating the drum at the reference RPM, rotating the impeller at a preset first water discharge RPM such that a level of water inside the discharge pipe is higher than a highest water level inside the housing;   rotating the drum at a first drum RPM lower than the reference RPM; and   while rotating the drum at the first drum RPM, rotating the impeller at a second water discharge RPM lower than the first water discharge RPM such that the level of water inside the discharge pipe remains higher than the highest water level inside the housing.   
     
     
         2 . The method of  claim 1 , wherein the first water discharge RPM is set to be a predetermined RPM that maintains a first amount of the water discharged from the housing while rotating the impeller at the first water discharge RPM, the first amount of the water being smaller than a second amount of the water supplied to the discharge pipe while rotating the drum at the reference RPM. 
     
     
         3 . The method of  claim 2 , wherein the second water discharge RPM is set to be a predetermined RPM that maintains a third amount of the water discharged from the housing while rotating the impeller at the second water discharge RPM, the third amount of the water being smaller than a fourth amount of the water supplied to the discharge pipe while rotating the drum at the first drum RPM. 
     
     
         4 . The method of  claim 2 , wherein the first water discharge RPM is configured to be a variable RPM that increases based on a fifth amount of the water supplied to the housing increasing and decreases based on the fifth amount of the water decreasing. 
     
     
         5 . The method of  claim 1 , further comprising:
 controlling a vibration sensor to measure vibration of the drum while rotating the drum at the first drum RPM;   rotating the drum at a second drum RPM; and   rotating the impeller at a third water discharging RPM while rotating the drum at the second drum RPM.   
     
     
         6 . The method of  claim 5 , wherein the third water discharge RPM is configured to maintain a sixth amount of the water supplied to the housing while rotating the drum at the second drum RPM, the sixth amount of the water being larger than a seventh amount of the water discharged from the housing while rotating the impeller at the third water discharge RPM. 
     
     
         7 . The method of  claim 5 , wherein the third water discharge RPM is configured to be a variable RPM that increases based on an eighth amount of the water supplied to the housing increasing and decreases based on the eighth amount of the water decreasing. 
     
     
         8 . The method of  claim 5 , further comprising:
 pausing the rotation of the drum based on the measured vibration being greater than a reference value; and   pausing the rotation of the impeller based on the measured vibration being greater than the reference value.   
     
     
         9 . The method of  claim 8 , further comprising:
 based on completion of pausing the rotation of the drum and pausing the rotation of the impeller, alternately repeating clockwise and counter-clockwise rotations of the drum; and   based on completion of alternately repeating the clockwise and counter-clockwise rotations of the drum, performing:
 rotating the drum at the reference RPM; 
 while rotating the drum at the reference RPM, rotating the impeller at the first water discharge RPM; 
 rotating the drum at the first drum RPM; and 
 while rotating the drum at the first drum RPM, rotating the impeller at the second water discharge RPM. 
   
     
     
         10 . The method of  claim 8 , further comprising:
 based on completion of pausing the rotation of the drum and pausing the rotation of the impeller, alternately repeating clockwise and counter-clockwise rotations of the drum; and   based on completion of alternately repeating the clockwise and counter-clockwise rotations of the drum, performing:
 rotating the drum at the first drum RPM; and 
 while rotating the drum at the first drum RPM, rotating the impeller at the second water discharge RPM. 
   
     
     
         11 . The method of  claim 1 , wherein the laundry treating machine includes an impeller driver configured to rotate the impeller. 
     
     
         12 . The method of  claim 1 , wherein the discharge pipe is a first discharge pipe, and wherein the laundry treating machine includes a second discharge pipe configured to guide the water discharged from the housing out of the cabinet. 
     
     
         13 . The method of  claim 1 , wherein the laundry treating machine includes a water discharge pump, wherein the water discharge pump includes the housing and the impeller.