# US 2025/0154713 A1 · Laundry treating apparatus

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- Number: US 2025/0154713 A1
- Document ID: US20250154713A1
- Status: Published application
- Kind: A1
- Application number: 19/024,771
- Filed: 2025-01-16
- Published: 2025-05-15
- Earliest claimed: 2020-06-24
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Hyuksoo LEE; Woohee KANG; Taewoong KIM
- Web page: https://patentgrep.com/patent/US20250154713A1

## CPC

- D06F 58/48: Control of the energy consumption
- D06F 34/20: Parameters relating to constructional components, e.g. door sensors
- D06F 58/206: {Heat pump arrangements}
- F25B 49/02: for compression type machines, plants or systems
- D06F 2103/10: expressed as capacitance or resistance
- D06F 2103/50: related to heat pumps, e.g. pressure or flow rate
- D06F 2105/26: Heat pumps
- D06F 2105/30: Blowers
- D06F 2105/48: Drum speed
- F25B 2600/02: Compressor control
- F25B 2600/11: Fan speed control
- F25B 2700/21152: at the discharge side of the compressor
- F25B 2700/21172: at the inlet
- F25B 2700/21173: at the outlet
- Y02B 40/00: Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
- D06F: LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A laundry treating apparatus includes a cabinet, a drum, a fluid circulator including a compressor sensor, an air circulator including a fan, a driver including a first driver and a second driver, and a controller. A drying operation includes an efficiency increasing process for increasing drying efficiency inside the drum, an efficiency maintaining process for maintaining the drying efficiency, and an efficiency decreasing process for reducing the drying efficiency. The controller performs the drying operation while distinguishing the efficiency increasing process, the efficiency maintaining process, and the efficiency decreasing process from each other through a measured value of the compressor sensor.

## Claims

### Claim 1

A laundry treating apparatus comprising:
a cabinet;
a drum disposed rotatably inside the cabinet and configured to accommodate laundry therein, the drum including an electrode sensor configured to measure a moisture amount in contact with the laundry;
a fluid circulator including a condenser, a compressor, and an evaporator circulating fluid therethrough, the fluid circulator including a compressor sensor configured to measure a temperature of fluid discharged from the compressor;
an air circulator including a fan configured to cause air heated by passing through the fluid circulator to flow into the drum;
a driver including (i) a first driver configured to rotate the drum and (ii) a second driver configured to rotate the fan; and
a controller configured to perform a drying operation of the laundry by controlling the compressor, the first driver, and the second driver, respectively,
wherein the drying operation includes (i) an efficiency increasing process for increasing a drying efficiency that is related to a humidity of the air inside the drum, (ii) an efficiency maintaining process for maintaining the drying efficiency, and (iii) an efficiency decreasing process for reducing the drying efficiency, and
wherein the controller is configured to:
terminate the efficiency increasing process and perform the efficiency maintaining process when a measured value of the compressor sensor reaches a preset efficiency maintaining process entry compressor sensor value in the efficiency increasing process, and
terminate the efficiency maintaining process and perform the efficiency decreasing process when a measured value of the electrode sensor reaches a preset efficiency decreasing process entry electrode sensor value in the efficiency maintaining process.

### Claim 2 (depends on 1)

The laundry treating apparatus of claim 1, wherein the drying efficiency is derived by an actual evaporation amount for a maximum evaporation amount of moisture expected inside the drum.

### Claim 3 (depends on 1)

The laundry treating apparatus of claim 1, wherein the fluid circulator further includes an evaporator sensor configured to measure a temperature of fluid flowing into or out of the evaporator, and
wherein the controller is configured to perform the efficiency maintaining process when a measured value of the evaporator sensor reaches a preset efficiency maintaining process entry evaporator sensor value in a state where the measured value of the compressor sensor has reached an efficiency maintaining process entry compressor sensor value.

### Claim 4 (depends on 1)

The laundry treating apparatus of claim 1, further comprising an outdoor air sensor configured to measure a temperature of air outside the cabinet,
wherein the controller is configured to correct the efficiency maintaining process entry compressor sensor value to a higher value based on an increase of a measured value of the outdoor air sensor.

### Claim 5 (depends on 1)

The laundry treating apparatus of claim 1, wherein the controller is configured to control a frequency of the compressor to a higher value in the efficiency increasing process than in the efficiency maintaining process.

### Claim 6 (depends on 1)

The laundry treating apparatus of claim 1, wherein the fluid circulator further includes an evaporator sensor measuring a temperature of fluid flowing into or out of the evaporator, and
wherein the controller is configured to terminate the efficiency maintaining process and perform the efficiency decreasing process when a change rate of a measured value of the evaporator sensor reaches a preset efficiency decreasing process entry change rate or measured value of the electrode sensor reaches a preset efficiency decreasing process entry electrode sensor value.

### Claim 7 (depends on 1)

The laundry treating apparatus of claim 1, wherein the drying operation includes a laundry amount determination process, wherein the controller is configured to control the driver to rotate the drum and determine an amount of laundry inside the drum in the laundry amount determination process, and
wherein the controller is configured to determine the efficiency decreasing process using the measured value of the electrode sensor when the amount of laundry is equal to or greater than a preset small amount reference value.

### Claim 8 (depends on 1)

The laundry treating apparatus of claim 1, wherein the efficiency decreasing process includes a first efficiency decreasing process and a second efficiency decreasing process performed after termination of the first efficiency decreasing process, and
wherein the controller is configured to control the driver and the compressor such that a reduction rate of the drying efficiency is lower in the first efficiency decreasing process than in the second efficiency decreasing process.

### Claim 9 (depends on 8)

The laundry treating apparatus of claim 8, wherein the controller is configured to terminate the first efficiency decreasing process and perform the second efficiency decreasing process when the measured value of the electrode sensor corresponds to a preset second efficiency decreasing process entry electrode sensor value for a preset observation time in the first efficiency decreasing process.

### Claim 10 (depends on 9)

The laundry treating apparatus of claim 9, wherein the drying operation includes a laundry amount determination process, wherein the controller is configured to control the driver to rotate the drum and determine an amount of laundry inside the drum, and
wherein, when the amount of laundry is equal to or greater than a preset small amount reference value, the controller is configured to perform the second efficiency decreasing process when the measured value of the electrode sensor reaches the second efficiency decreasing process entry electrode sensor value.

### Claim 11 (depends on 8)

The laundry treating apparatus of claim 8, wherein the controller is configured to:
control an RPM of the driver and a frequency of the compressor in the first efficiency decreasing process to values equal to or lower than values in the efficiency maintaining process, respectively; and
control the RPM of the driver and the frequency of the compressor in the second efficiency decreasing process to values lower than the values in the first efficiency decreasing process.

### Claim 12 (depends on 11)

The laundry treating apparatus of claim 11, wherein the drying operation includes a laundry amount determination process, wherein the controller is configured to control the driver to rotate the drum and determine an amount of laundry inside the drum in the laundry amount determination process, and
wherein the controller is configured to control the RPM of the driver and the frequency of the compressor in the first efficiency decreasing process to be respectively equal to the values in the efficiency maintaining process when the amount of laundry is equal to or greater than a preset large amount reference value.

### Claim 13 (depends on 12)

The laundry treating apparatus of claim 12, wherein, in the first efficiency decreasing process, the controller is configured to control the first driver to control an RPM of the drum to be equal to a value in the efficiency maintaining process, control the second driver to control an RPM of the fan to be lower than a value in the efficiency maintaining process, and control the compressor to control the frequency of the compressor to be lower than in the efficiency maintaining process when the amount of laundry is less than the large amount reference value.

### Claim 14 (depends on 11)

The laundry treating apparatus of claim 11, wherein, in the second efficiency decreasing process, the controller is configured to control the first driver to control the RPM of the drum to a cooling RPM lower than a value in the efficiency maintaining process for a preset cooling time, and control the RPM of the drum to a value lower than the cooling RPM after the preset cooling time has elapsed.

### Claim 15 (depends on 1)

The laundry treating apparatus of claim 1, wherein the controller is configured to control the second driver such that an RPM of the fan is constant in the efficiency decreasing process.

### Claim 16 (depends on 1)

The laundry treating apparatus of claim 1, wherein the efficiency increasing process includes a first efficiency increasing process and a second efficiency increasing process performed after termination of the first efficiency increasing process,
wherein the controller is configured to control the driver and the compressor such that an increase rate of the drying efficiency and the measured value of the compressor sensor are higher in the first efficiency increasing process than in the second efficiency increasing process, and
wherein the controller is configured to perform the second efficiency increasing process after performing the first efficiency increasing process for a preset first efficiency increasing process execution time.

### Claim 17 (depends on 16)

The laundry treating apparatus of claim 16, wherein the controller is configured to control the second driver such that an RPM of the fan is lower in the first efficiency increasing process than in the second efficiency increasing process.

### Claim 18 (depends on 17)

The laundry treating apparatus of claim 17, wherein the controller is configured to control the compressor such that a frequency of the compressor is constant in the efficiency increasing process.

### Claim 19 (depends on 16)

The laundry treating apparatus of claim 16, wherein the controller is configured to:
control the first driver such that an RPM of the drum is the same in the first efficiency increasing process and in the second efficiency increasing process; and
control the second driver such that an RPM of the fan is lower in the first efficiency increasing process than in the second efficiency increasing process.

### Claim 20 (depends on 16)

The laundry treating apparatus of claim 16, wherein the first efficiency increasing process includes a laundry amount determination process, wherein the controller is configured to determine an amount of laundry inside the drum by controlling the first driver to rotate the drum and in the laundry amount determination process, and
wherein the controller is configured to control the first driver such that an RPM of the drum is constant in the first efficiency increasing process after the laundry amount determination process.