# US 9,039,786 B2 · Control method of laundry machine

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- Number: US 9,039,786 B2
- Document ID: US9039786B2
- Status: Granted
- Kind: B2
- Application number: 13/392,610
- Filed: 2010-08-27
- Published: 2012-06-21
- Granted: 2015-05-26
- Earliest claimed: 2009-08-27
- Assignees: LG Electronics Inc.
- Applicants: Jae Hyuk Jang; Bon Kwon Koo
- Inventors: Jae Hyuk Jang; Bon Kwon Koo
- Web page: https://patentgrep.com/patent/US9039786B2

## CPC

- D06F 37/225: {Damping vibrations by displacing, supplying or ejecting a material, e.g. liquid, into or from counterbalancing pockets}
- D06F 33/48: Preventing or reducing imbalance or noise
- D06F 2103/26: Imbalance; Noise level
- D06F 2105/48: Drum speed
- D06F: LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES

## Abstract

A control method of a laundry machine is disclosed. The control method of a laundry machine comprising a balancer includes an unbalance sensing step, wherein the unbalance sensing step recognizes an unbalancemaximum value and an unbalanceminimum value of an unbalance wave and the unbalance sensing step determines an average value of the two unbalance maximumvalue and unbalanceminimum value to be of the unbalance generated in a drum provided in the laundry machine.

## Claims

### Claim 1

A control method for a laundry machine comprising a balancer, the control method comprising:
determining an unbalance amount of a drum based on at least one of an unbalance minimum value and an unbalance maximum value of predetermined time period for an unbalance wave, wherein the determining further comprises: recognizing an unbalance maximum value and an unbalance minimum value of the unbalance wave after a predetermined time limit rotating the drum at a predetermined constant RPM; and determining an average value of the unbalance maximum value and unbalance minimum value to he the unbalance amount of the drum.

### Claim 2 (depends on 1)

The control method as claimed in claim 1, wherein the unbalance maximum value and the unbalance minimum value are recognized sequentially when the unbalance wave is increasing and the unbalance minimum value and the unbalance maximum value are recognized when the unbalance wave is decreasing.

### Claim 3 (depends on 1)

The control method as claimed in claim 1, wherein the unbalance sensing step is completed, in case a maximum value calculated from the unbalance wave before the predetermined time limit is a predetermined reference value or more, and a laundry disentangling step and the unbalance sensing step are implemented.

### Claim 4 (depends on 1)

The control method as claimed in claim 1, wherein an unbalance sensing step is completed based on a preset unbalance limit value after the predetermined time limit, and a laundry disentangling step and the unbalance sensing step are implemented or a spinning step is implemented.

### Claim 5 (depends on 4)

The control method as claimed in claim 4, wherein the unbalance sensing step is complemented if the unbalance wave reaches an unbalance maximum limit value while increasing, and the laundry disentangling step and the unbalance sensing step are implemented.

### Claim 6 (depends on 4)

The control method as claimed in claim 4, wherein the unbalance sensing step is complemented if the unbalance wave reaches an unbalance minimum limit while decreasing, and the spinning step is implemented.

### Claim 7 (depends on 1)

The control method as claimed in claim 1, wherein a period of the unbalance wave is recognized by a time difference between the unbalance maximum value and the unbalance minimum value.

### Claim 8 (depends on 7)

The control method as claimed in claim 7, wherein an accelerating point of the drum speed is determined based on the period.

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 1)

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.

### Claim 11 (depends on 1)

The control method as claimed in claim 1, wherein a tub is supported rigidly more than a drum being supported by a suspension assembly.