Control method of laundry machine

Abstract

A control method of a laundry machine is disclosed. The control method of a laundry machine comprising a balancer includes a step configured to determine an irregular vibration region of the laundry machine and a balancing step implemented at least one time before a rotation speed of a drum enters the irregular vibration region, while the rotation speed is passing the irregular vibration region and after the rotation speed passes the irregular vibration region.

1 . A control method of a laundry machine comprising a drum having a balancer, the control method comprising:
 a step configured to balance the drum at least one time before and while a rotation speed of the drum passes a transient region.   
     
     
         2 . The control method as claimed in  claim 1 , wherein the transient region is defined as a RPM region between a start RPM and an end RPM more than a RPM calculated by adding a value of 30% of the start RPM to the start RPM. 
     
     
         3 . The control method as claimed in  claim 1 , wherein the transient region comprises a RPM band of 200 to 350 rpm. 
     
     
         4 . The control method as claimed in  claim 1 , wherein the balancing is implemented in a RPM band higher than a RPM calculated by subtracting a value of approximately 25% of the start RPM from the start RPM, if balancing is implemented before the drum speed passes the transient region. 
     
     
         5 . The control method as claimed in  claim 4 , wherein the balancing RPM is lower than the start RPM of the transient region. 
     
     
         6 . The control method as claimed in  claim 1 , wherein the balancing is implemented at a balancing RPM band of 150 RPM or higher and lower than 200 RPM before the drum speed passes the transient region. 
     
     
         7 . The control method as claimed in  claim 1 , wherein the laundry machine includes a balancer and the control method comprising:
 a first transient region step for starting acceleration of the drum in a state an angle between an unbalance and balls is 90° or greater than 90° to enter into a transient region;   a third constant speed rotation step for rotating the drum at a constant speed of a third rotation speed to increase the angle between the unbalance and the balls again; and,   a second transient region step for accelerating the drum to a rotation speed higher than the third rotation speed in a state the angle between the unbalance and the balls is 90° or greater than 90° for escaping from the transient region.   
     
     
         8 . The control method as claimed in  claim 7 , further comprising a first constant speed rotation step for rotating the drum at a constant speed rotation of a first rotation speed to sense a first unbalance and to compare the first unbalance to a first allowable unbalance. 
     
     
         9 . The control method as claimed in  claim 7 , wherein the third constant speed rotation step is maintained for a time period to make ball balancing of the balancer. 
     
     
         10 . The control method as claimed in  claim 9 , wherein an inclination of rotation speed of the second transient region step is larger than an inclination of rotation speed of the first transient region step. 
     
     
         11 . The control method as claimed in  claim 9 , wherein the laundry machine includes a balancer and the second transient region step has an acceleration slope steeper than the acceleration slope of the first transient region step. 
     
     
         12 . The control method as claimed in  claim 7 , wherein the third rotation speed is determined such that the first transient region step transits to the third constant speed rotation step while vibration perpendicular to the rotation shaft of the drum becomes smaller, gradually. 
     
     
         13 . The control method as claimed in  claim 12 , wherein the third rotation speed is determined such that an average of maximum intensity of the vibration of the drum in the third constant speed rotation step is below an half of the maximum intensity of the vibration of the drum in the first transient region step. 
     
     
         14 . The control method as claimed in  claim 7 , wherein the first transient region step includes a section in which the angle between the unbalance and the balls is 180°. 
     
     
         15 . The control method as claimed in  claim 14 , wherein the second transient region step includes a section in which the angle between the unbalance and the balls is 180°. 
     
     
         16 . The control method as claimed in  claim 15 , wherein the third constant speed rotation step is maintained for a time period to make balancing of the balancer. 
     
     
         17 . The control method as claimed in  claim 7 , wherein the second transient region step has a maximum intensity of vibration perpendicular to a rotation shaft of the drum below an half of the maximum intensity of the vibration in the first transient region step. 
     
     
         18 . The control method as claimed in  claim 8 , further comprising a second constant speed rotation step of sensing a second unbalance of the drum at a second rotation speed faster than the first rotation speed and comparing the second unbalance with a second allowable unbalance. 
     
     
         19 . The control method as claimed in  claim 1 , wherein the laundry machine comprises a driving unit comprising a shaft connected to a drum, a bearing housing to rotatably support the shaft, and a motor to rotate the shaft, and a suspension assembly is connected to the driving unit 
     
     
         20 . The control method as claimed in  claim 1 , wherein the laundry machine comprises a rear gasket for sealing to prevent washing water from leaking from a space between a driving unit and a tub, and enabling the driving unit movable relative to the tub. 
     
     
         21 . The control method as claimed in  claim 1 , wherein a tub is supported rigidly more than a drum being supported by a suspension assembly. 
     
     
         22 . The control method as claimed in  claim 19 , wherein the balancer includes;
 14 balls each with a diameter of 18.55˜19.55 mm, and   a racer with a ball housing portion which is a space for housing the balls with a sectional area of 410˜413 mm 2  and a diameter of 500˜510 mm.   
     
     
         23 . The control method as claimed in  claim 19 , wherein the ball housing portion of each of the front balancer and the rear balancer includes 340˜360 cc of oil with 300 cs viscosity injected thereto. 
     
     
         24 . The control method as claimed in  claim 20 , wherein the balancer includes;
 14 balls each with a diameter of 18.55˜19.55 mm, and   a racer with a ball housing portion which is a space for housing the balls with a sectional area of 410˜413 mm 2  and a diameter of 500˜510 mm.   
     
     
         25 . The control method as claimed in  claim 21 , wherein the balancer includes;
 14 balls each with a diameter of 18.55˜19.55 mm, and   a racer with a ball housing portion which is a space for housing the balls with a sectional area of 410˜413 mm 2  and a diameter of 500˜510 mm.   
     
     
         26 . The control method as claimed in  claim 20 , wherein the ball housing portion of each of the front balancer and the rear balancer includes 340˜360 cc of oil with 300 cs viscosity injected thereto. 
     
     
         27 . The control method as claimed in  claim 21 , wherein the ball housing portion of each of the front balancer and the rear balancer includes 340˜360 cc of oil with 300 cs viscosity injected thereto.