Laundry treatment device and control method therefor

1 . A laundry treatment device comprising:

a tub configured to receive laundry;

a water supply unit configured to supply washing water to the tub;

a sensor unit configured to sense turbidity of the washing water introduced into the tub; and

a processor configured to control the laundry treatment device according to a type of detergent that is identified based on first turbidity information on the washing water,

wherein the first turbidity information is measured in a first time period, through the sensor unit, after the washing water is introduced into the tub,

wherein the processor is configured to control a washing stroke according to the type of the detergent that is identified based on the first turbidity information on the washing water,

wherein the first turbidity information includes a variation in turbidity value,

wherein the processor is configured to:

based on a first degree of change of the turbidity value within the first time period, identify the type of detergent to be a liquid detergent, and

based on a second degree of change of the turbidity value within the first time period, identify the type of detergent to be a powder detergent, and

wherein the first degree of change is greater than the second degree of change.

2 . The laundry treatment device of claim 1 , wherein the processor is configured to control a washing stroke according to the type of the detergent identified based on the first turbidity information on the washing water, the first turbidity information being measured in at least a portion of a first time period after the washing water is introduced into the tub, and

wherein the first turbidity information includes turbidity value and the variation in the turbidity value.

3 . The laundry treatment device of claim 2 , wherein the processor is configured to control the laundry treatment device to perform a clothing wetting operation of rotating the tub at a first speed after the first time period and perform a washing operation of rotating the tub at a second speed faster than the first speed.

4 . The laundry treatment device of claim 3 , wherein the tub is configured to, in the first time period, not rotate, or rotate at a speed slower than the first speed.

5 . The laundry treatment device of claim 2 , wherein a length of the first time period is variably set depending on an introduced amount of the detergent.

6 . The laundry treatment device of claim 1 , further comprising an output unit configured to provide information on the identified type of the detergent to a user.

7 . The laundry treatment device of claim 1 , wherein the processor is configured to:

determine a number of washing strokes depending on an amount of the laundry and a washing mode set by a user; and

increase the number of washing strokes based on the identified type of the detergent being the powder detergent.

8 . The laundry treatment device of claim 1 , wherein the processor is configured to determine, based on the identified type of the detergent being the liquid detergent, whether to perform additional water supply or additional detergent introduction based on second turbidity information on the washing water, the second turbidity information being measured through the sensor unit in at least a portion of a washing stroke after the first turbidity information is measured.

9 . The laundry treatment device of claim 8 , wherein a rotation speed of the tub at a time of measuring the second turbidity information is faster than a rotation speed of the tub at a time of measuring the first turbidity information.

10 . The laundry treatment device of claim 2 , wherein the type of the detergent is determined based on an artificial neural network that receives an input on at least one of the turbidity value or the variation in the turbidity value and outputs the type of the detergent.

11 . A method of controlling a laundry treatment device, the method comprising:

introducing washing water into a tub of the laundry treatment device;

identifying first turbidity information on the washing water after the washing water is introduced into the tub;

identifying a type of detergent based on the identified first turbidity information; and

controlling a washing stroke according the type of the detergent,

wherein the first turbidity information is measured in a first time period after the washing water is introduced into the tub, the first turbidity information including a variation in turbidity value,

wherein identifying the type of detergent comprises:

identifying, based on a first degree of change of the turbidity value within the first time period, the type of detergent to be a liquid detergent, and

identifying, based on a second degree of change of the turbidity value within the first time period, the type of detergent to be a powder detergent, and

wherein the first degree of change is greater than the second degree of change.

12 . A computer-readable recording medium configured to store a computer program for executing the method of claim 11 by using a computer.