KR100638221B1 - Drying control method of the laundry dryer - Google Patents

Abstract

The drying control method of the laundry dryer of the present invention includes a drying total load determining step of determining a total drying load; A fabric water content determining step of determining the water content of the fabric; A moisture content determining step of determining an initial moisture content of the fabric from the determined total dry load and the determined moisture content of the fabric; A comparison step of comparing the initial moisture content of the determined cloth with a set moisture content; As a result of the comparing step, if the determined initial moisture content of the fabric is more than the set moisture content, the drying process is performed after the dehydration process, there is an advantage that can be dried more efficiently than when drying the fabric immediately without dehydration .

Description

Drying control method of washing machine with dryer}

1 is a flow chart illustrating an example of a laundry and drying algorithm of a laundry dryer according to the prior art.

2 is a schematic cross-sectional view of an example of a laundry dryer to which a drying control method of the laundry dryer according to the present invention is applied;

3 is a flowchart showing a first embodiment of a method for controlling drying of a laundry dryer according to the present invention;

4 is a flowchart showing a second embodiment of a method for controlling drying of a laundry dryer according to the present invention;

5 is a flowchart illustrating a third embodiment of a method for controlling drying of a laundry dryer according to the present invention.

<Explanation of symbols on main parts of the drawings>

16: motor 20; drum

26: heater 28: fan

30: drying duct 41: condensation duct

46: temperature sensor 47: humidity sensor

48: control panel 49: control unit

The present invention relates to a drying control method of a laundry dryer, and more particularly, to a drying control method of a laundry dryer in which a cloth is dehydrated and dried when the water content of the cloth is excessive.

In general, a laundry dryer is a household appliance that can be used in one system for not only washing but also drying, and includes a cabinet that largely forms the exterior of the laundry dryer, and is installed in the cabinet to contain detergent and water for washing during the washing process and rinse. A tub containing water for rinsing during the process, a drum rotated inside the tub to wash, rinse and dewater the fabric, and a drying device connected to the tub and drying the fabric including a heater and a fan. It is composed.

The laundry dryer as described above performs a process of constructing the selected course when the user selects any one of various courses (standard course, boiling course, etc.) after putting the laundry and drying object into the drum.

1 is a flow chart illustrating an example of a laundry and drying algorithm of a laundry dryer according to the prior art.

First, the laundry dryer supplies water together with detergent and washes the drum by rotating the drum. When the washing is finished, the drum is stopped and the contaminated water in the tub is drained to the outside of the laundry dryer (S1).

Thereafter, the drum is rotated to perform intermediate dehydration to dehydrate the foam remaining in the fabric and stop the drum. (S2)

Then, the fresh water is fed into the tub and the drum is rotated to rinse, and when the rinsing is finished, the drum is stopped and the water including the foam in the tub is drained out of the laundry dryer.

Then, the drum is rotated at a high speed to perform the main dehydration for centrifugal dehydration of water remaining in the fabric and then the drum is stopped (S4).

The laundry dryer turns on the heater while rotating the drum after the main dehydration, and dries the cloth by rotating the fan. When drying is complete, the drum and the fan are stopped and the heater is turned off.

The laundry dryer terminates the selected course when all processes of the course input by the user are finished.

However, in the conventional drying control method of the laundry dryer, when washing and drying are continued, the end of washing and the start of drying proceed independently of each other, so that drying starts without sensing the state of the laundry after the washing ends, and only drying without washing. In the case of independently performing the drying, drying is performed without any sense of the state of the drying object because the drying is independently configured, so that there is a problem that the drying is not efficient when the fabric has a lot of moisture.

The present invention has been made in order to solve the above problems of the prior art, if the moisture content of the fabric is a lot of drying the laundry dryer which can dry the cloth more efficiently by dehydrating the cloth before the start of drying, drying The purpose is to provide a control method.

Drying control method of the laundry dryer according to the present invention for solving the above problems is a dry total load determination step of determining the total dry load; A fabric water content determining step of determining the water content of the fabric; A moisture content determining step of determining an initial moisture content of the fabric from the determined total dry load and the determined moisture content of the fabric; A comparison step of comparing the initial moisture content of the determined cloth with a set moisture content; When the initial moisture content of the fabric determined as a result of the comparison step is greater than the set moisture content, it is characterized in that it comprises a drying step to perform a drying process after the dehydration process, otherwise, the drying process.

The drying control method of the laundry dryer according to the present invention includes a drying total load determining step of determining a total drying load; A fabric water content determining step of determining the water content of the fabric; A moisture content determining step of determining an initial moisture content of the fabric from the determined total dry load and the determined moisture content of the fabric; And a drying stroke determining step of determining a drying stroke according to the determined initial moisture content of the fabric.

The drying total load determination step is characterized in that the same as the normal dehydration load determination.

The step of determining the moisture content of the fabric is characterized by determining the moisture content of the fabric by turning on the heater and rotating the fan, and measuring the temperature rise after the heating of the heater and the rotation of the fan are performed for a predetermined time.

The water content determining step of the bubble is characterized by determining the water content of the fabric by rotating the fan and measuring the absolute humidity of the dry load.

The drying step is characterized in that the drying process is terminated if the water content of the fabric during the drying process is less than the drying end set water content.

In the drying step, when the washing process, the drying process and the dehydration speed are selected by the user, and the dehydration speed of the washing process exceeds the dehydration speed selected by the user, the drying process is performed immediately without performing the dehydration process. It is done.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic cross-sectional view of one example of a laundry dryer to which a drying control method of the laundry dryer according to the present invention is applied.

In the laundry dryer shown in FIG. 2, a cloth entry hole 3 is formed on the front surface of the cabinet 2 forming the exterior, and a door 4 for opening and closing the cloth entry hole 3 is pivotable by a hinge. Is installed.

Tub 10 is installed inside the cabinet 2.

The tub 10 may be fixedly installed in the cabinet 2, or may be installed in a buffered manner in the cabinet 2 by a spring 11 or a damper 12.

The tub 10 has an opening 13 formed at the rear of the cloth access hole 3, and closes the door 4 when the door 4 is closed to prevent leakage of air, water, and cloth. The gasket 13 is mounted.

The tub 10 is connected to a water supply device 14 for supplying clean water or detergent-containing water to the inside of the tub 10 when washing or rinsing, and in the contaminated water or cloth in the tub 10 The drainage device 15 for draining the dehydrated water to the outside is connected.

The tub 10 is provided with a motor 16 to support / rotate the drum 20 described later.

The motor 16 is a stator mounted on the rear surface of the tub 10, a rotor rotated in interaction with the stator, and is built up in the rotor and connected to the rear side of the drum 20 through the tub. It comprises a drive shaft.

The motor 16 is provided with a hall sensor (not shown) in the stator to measure the rotation angle of the rotor and the like.

The drum 20 is rotatably positioned inside the tub 10, and an opening hole 21 is formed behind the cloth entrance hole 3.

The drum 20 has a through hole 22 through which washing water or air passes through a circumferential or rear portion thereof, and a lifter 24 for flowing a cloth on the inner circumferential surface thereof is mounted.

On the other hand, the laundry dryer is installed on the top of the tub 10 to discharge the hot air to the tub 10, the drying duct 30, the heater 26 and the fan 28 is built-in, the tub 10 It further comprises a condenser 40 for condensing the air blown toward the drying duct 30 in the.

The fan duct 31 is installed in the drying duct 30 to rotate the fan 28.

The condenser 40 is configured to include a condensation duct 41 for condensing moisture of air circulated by one side is connected to the lower side of the tub 10, the other side is connected to the drying duct 30.

The condensation duct 41 is connected to a cooling water supply 42 for supplying cooling water for condensation into the condensation duct 41 so that moisture in the air circulated while drying the fabric.

The cooling water supplier 42 is connected to the external hose 43 to cool the valve for condensation cooling water supplied through the external hose 43 and the condensing duct to the cooling water for condensation passing through the cooling water valve (41) It comprises a coolant hose (45) for guiding the inside.

On the other hand, the laundry dryer comprises a temperature sensor 46 for measuring the temperature of the air during the initial or during the drying stroke, and a humidity sensor 47 for measuring the humidity of the air.

The temperature sensor 46 and the humidity sensor 47 are preferably installed inside the condensation duct 41.

Reference numeral 48 denotes a control panel for inputting various courses and the like into the laundry dryer, and reference numeral 49 denotes a command input to the control panel 48 and detection of the temperature sensor 46 or humidity sensor 47. The control unit controls the motor 16, the heater 26, the fan 28 and the like according to the result.

3 is a flowchart illustrating a first embodiment of a method for controlling drying of a laundry dryer according to the present invention.

In the drying control method of the laundry dryer according to the present embodiment, when a course including a washing process and a drying process is input and all processes before the drying process are ended, or a command of sole drying to perform drying alone is input, FIG. As shown in FIG. 3, a dry total load determination step of determining a dry total load W _T is performed. (S11)

Here, the dry total load determination step (S11) is carried out as in the normal dehydration load determination.

That is, the controller 49 starts the motor 16 to rotate the drum 20, and then measures the load amount by measuring the rotation angle and time until the drum 20 stops by applying braking, The determined load amount is determined as the dry total load amount W _T.

On the other hand, the controller 49 starts the motor 16 and accelerates until it reaches a predetermined reference speed (rpm), and when the rotation speed of the motor 16 reaches the reference speed (rpm), After the constant speed is maintained for a predetermined time, the motor 16 is turned off, and a pulse width modulation (PWM) duty value from the time of starting the motor 16 to the constant speed is measured and the motor 16 is measured. The rotation angle of the rotational force of) is measured, and the average value of the measured pulse width modulation (PWM) duty value is multiplied by the proportional constant (a) and the rotation angle by the force is multiplied by the proportional constant (b) It goes without saying that it is also possible to finally determine the total dry load W _T by adding the numerical value.

In the drying control method of the laundry dryer, after determining the total dry load amount W _T by any of the above-described determinations, the moisture content determination step of determining the moisture content W _W of the fabric is performed.

The controller 49 turns on the heater 26 and rotates the fan 28 to determine the moisture content (W _W ) of the fabric, and according to the sensing result of the temperature sensor 46, The water content (W _W ) is determined. (S12) (S13)

The controller 49 may also drive the motor 16 such that the drum 20 is rotated forward and reverse with the on and the rotation of the fan 28.

Hereinafter, the water content (W _W ) determination of the cloth is described in more detail as follows.

When the fan 28 is rotated, the air in the drum 20 flows to be in contact with the cloth and becomes low temperature and humidity, and passes through the through hole 22 of the drum 20 to form the condensation duct 41 and the drying duct ( 30 is sequentially passed, and is heated by the heater 26 while passing through the drying duct 30. The heated air is circulated into the drum 20, and then the circulation / heating is repeated as described above (S12).

)을 이용하여, 포의 수분 함유량(W_W)을 판정한다.(S13)The controller 49 controls the temperature rise detected by the temperature sensor 46 after the on of the heater 26 and the rotation of the fan 28 continue for a predetermined time (for example, 5 minutes).

) Is used to determine the water content (W _W ) of the fabric. (S13)

)은 다르게 측정되며, 이 값을 기초로 포의 수분 함유량(W_W)을 판단할 수 있다.For example, as shown in Table 1 below, even if the dry total load amount W _T determined in the dry total load determination step S11 is equal to 1.7 kg, the dry load, that is, the moisture contained in the fabric, Depending on the quantity

) Is measured differently and based on this value, the moisture content (W _W ) of the fabric can be determined.

TABLE 1

W _T (kg)

(℃)

(℃) W _W (kg) Case 1 1.7 20 0.7 Case 2 1.7 15 0.5

)에 따른 포의 수분 함유량(W_W) 판정은 비례식 등의 수학식에 의해 판정되는 것도 가능하고, 기설정된 별도의 테이블에 의해 판정되는 것도 가능함은 물론이다.Here, the temperature rise (

The water content (W _W ) of the cloth can be determined by a formula such as a proportional formula, or can be determined by a predetermined table.

Then, the drying control method of the laundry dryer performs a moisture content determination step of determining the initial moisture content Ui of the fabric from the determined total dry load W _T and the determined foam moisture content W _W. (S14)

Here, the initial moisture content (Ui) of the fabric is a dry load, that is, a percentage of the moisture content contained in the fabric, and is defined as in Equation 1 below.

[Equation 1]

(%)

(%)

The controller 49 calculates the initial moisture content Ui of the cloth by substituting the determined total dry load W _T and the determined cloth moisture content W _W into the above equation 1.

Then, the drying control method of the laundry dryer determines the drying stroke according to the determined initial moisture content Ui of the cloth.

The drying control method of the laundry dryer performs a comparison step of comparing the determined initial moisture content (Ui) of the cloth with a predetermined set moisture content (X, for example, 40%) (S15).

Here, the set moisture content X is a reference value for determining the implementation of the dehydration process described later, and is set by an experiment or the like.

The controller 49 determines that the moisture content of the cloth is large when the initial moisture content Ui of the cloth is greater than the set moisture content X, and the initial moisture content Ui of the cloth is the set water content X. When smaller, it is judged that the moisture content of cloth is small.

In the drying control method of the laundry dryer, if the determined initial moisture content (Ui) of the cloth is determined as a result of the comparison step, the moisture content of the cloth is determined to be large, dehydration process to remove the water of the cloth (S16)

Here, in the dehydration process, the motor 16 rotates the drum 20 to a predetermined AlpM (for example, 700 rpm) or more in order to centrifuge the water of the cloth having a high moisture content.

The dehydration process may be carried out for a time proportional to the amount of water, etc., may be carried out for a set time, the on-turn of the heater 26 and the rotation (S12) of the fan 28 and the water content (W) of the fabric. _W ) Of course, it is also possible to carry out until the water content U of the cloth falls below the set water content X while continuing the determination S13 and the water content determination S14 of the fabric.

Hereinafter, the dehydration process is carried out by repeating the rotation (S12) of the heater 26 and the fan (28), the water content determination step (S13) and the water content determination step (S14), the water content of the fabric It demonstrates only when it ends when (U) falls below set moisture content (X).

In the state where the moisture content of the cloth is reduced by the dehydration process (S16) as described above, the drying control method of the laundry dryer performs a drying process (S17).

The control unit 49 turns on the heater 26 in the drying process and rotates the fan 28, and sets the motor 16 to flow the fabric while the drum 20 rotates forward and backward. In reverse driving, the cooling water valve 44 is turned on so that the cooling water is supplied into the condensation duct 41.

When the fan 28 rotates, the internal air of the drum 20 is changed to low temperature and humidity while being in contact with the cloth, and then the moisture is condensed by the cooling water supplied while passing through the condensation duct 41 to low humidity air. After that, while passing through the drying duct 30, it is heated by the heater 26 to change to high temperature and low humidity.

The air of high temperature and low humidity is supplied into the drum 20 to dry the cloth, and then the cloth is continuously dried while repeating the above condensation / heating / drying.

On the other hand, if the moisture content of the fabric is less than the drying end setting moisture content (for example, 3%) during the implementation of the drying process (S16), the drying process is terminated.

On the other hand, in the drying control method of the laundry dryer, if the determined initial moisture content (Ui) of the cloth as a result of the comparison step (S15) is greater than the set water content (X), it is determined that the moisture content of the cloth is small, and The drying process (S17) is performed immediately without the same dehydration process (S16).

That is, the controller 49 turns on the heater 26 during the drying process, rotates the fan 28, and moves the motor 16 to flow the fabric while the drum 20 rotates forward and backward. It drives forward and backward, and also turns on the coolant valve 44 so that the coolant is supplied into the condensation duct 41.

Figure 4 is a flow chart illustrating a second embodiment of a drying control method of a laundry dryer according to the present invention.

In the drying control method of the laundry dryer according to the present embodiment, when a course including a washing process and a drying process is input and all processes before the drying process are terminated or when a command of sole drying to perform drying alone is input, FIG. 4 As shown in FIG. 9, the drying total load determination step S11 of determining the drying total load W _T is performed, and thereafter, the fan 28 is rotated to detect the absolute humidity w of the fabric. (S12 ′)

Then, the controller 49 uses the absolute humidity w detected by the humidity sensor 47 after the rotation of the fan 28 continues for a set time (for example, 5 minutes). The moisture content (W _W ) of the sample is determined. (S13 ')

For example, as shown in Table 2 below, the dried total load determined in the dry total load determination step (S11) (W _T) even values, such as the 1.7 kg, the moisture contained in the drying load, i.e., Po The absolute humidity (w) is measured differently according to the amount, and the moisture content (W _W ) of the fabric can be determined based on this value.

TABLE 2

W _T (kg) w (kg / kg) W _W (kg) Case 1 1.7 0.007 0.7 Case 2 1.7 0.005 0.5

Here, the water content (W _W ) determination of the cloth according to the absolute humidity (w) may be determined by a formula such as a proportional formula, or may be determined by a predetermined separate table.

Then, the control unit 49 determines the initial moisture content Ui of the fabric from the determined total dry load W _T and the determined foam moisture content W _W , as in the first embodiment of the present invention. A moisture content determination step is performed, and a comparison step of comparing the determined initial moisture content Ui with the predetermined set moisture content X (for example, 40%) is performed (S14) (S15).

As in the first embodiment of the present invention, if the initial moisture content (Ui) of the determined cloth is greater than the set moisture content (X), the control unit 49 determines that the water content of the cloth is large, In order to drain the water of the dehydration process (S16) is carried out, after which the drying process (S17) is carried out.

Here, the dehydration process (S16) may be carried out for a time proportional to the amount of water or the like, or may be performed for a predetermined time, and the rotation (S12 ') of the fan 28 and the cloth using the absolute humidity (w). It goes without saying that it is also possible to carry out the water content (W _W ) determination (S13 ') and the water content determination (S14) of the fabric while the water content (U) of the fabric is lowered below the set water content (X).

Hereinafter, the dehydration process (S16) repeats the rotation (S12 ') of the fan 28, the foam moisture content determination step (S13') using the absolute humidity (w), and the water content determination step (S14). In the meantime, the description will be made so as to be terminated when the water content U of the fabric falls below the set water content X.

The laundry dryer performs a drying process (S17) as in the first embodiment of the present invention in a state in which the moisture content of the fabric is reduced by the dehydration process (S16) as described above.

On the other hand, the control unit 49, as in the first embodiment of the present invention, as a result of the comparison step (S15), if the determined initial moisture content (Ui) is greater than the set moisture content (X), the moisture content of the fabric is small It is determined that the drying process (S17) is immediately performed without the above dehydration process (S16).

5 is a flowchart illustrating a third embodiment of a method for controlling drying of a laundry dryer according to the present invention.

In the drying control method of the washing machine according to the present embodiment, as shown in FIG. 5, when a course including a washing process and a drying process is input, the washing process (S31) and the dehydration process (S32) are sequentially performed. It is confirmed whether or not the spin speed (y) is selected (S33).

When the dehydration rate is selected by the user and the dehydration rate of the dehydration process S32 exceeds the dehydration rate y selected by the user (S33), the first embodiment and the present invention immediately after the dehydration process S32 and The drying process (S17) of the second embodiment is performed, and then (S18) is performed.

On the other hand, if the dehydration rate is not selected by the user, or if the dehydration rate of the dehydration process (S32) is less than or equal to the dehydration rate (y) selected by the user, as in the first or second embodiment of the present invention After the drying total load determination step (S11) is carried out.

)과 절대 습도(w)를 함께 고려하여 포의 수분 함유량(W_W)을 판정하는 것도 가능하고, 이 발명이 속하는 기술적 범주 내에서 그 다양한 실시가 가능함은 물론이다.On the other hand, the present invention is not limited to the above embodiments, the foam moisture content determination step is a temperature rise (

) And the absolute humidity (w) together, it is also possible to determine the water content (W _W ) of the fabric, and of course, various implementations are possible within the technical scope to which the present invention belongs.

The drying control method of the laundry dryer according to the present invention configured as described above is more efficient than when the fabric is dried immediately after dewatering the fabric after dehydration of the fabric if the fabric moisture content in the initial stage of drying is greater than or equal to the set fabric moisture content. There is an advantage that can be dried and the drying time can be shortened.

In addition, in the drying control method of the laundry dryer of the present invention, in the case of a course including a washing process and a drying process, the dehydration rate used during the washing process may be used as the moisture content determination information in the dry load when entering the drying process. There is an advantage that the load determination and the foam moisture content determination are unnecessary.

Claims (7)

A dry total load determination step of determining a dry total load amount; A fabric water content determining step of determining the water content of the fabric; A moisture content determining step of determining an initial moisture content of the fabric from the determined total dry load and the determined moisture content of the fabric; A comparison step of comparing the initial moisture content of the determined cloth with a set moisture content; If the initial moisture content of the fabric determined as a result of the comparison step is greater than the set moisture content, the drying step is carried out after the dehydration process, otherwise, the drying step comprising a drying step of performing a drying process Control method. A dry total load determination step of determining a dry total load amount; A fabric water content determining step of determining the water content of the fabric; A moisture content determining step of determining an initial moisture content of the fabric from the determined total dry load and the determined moisture content of the fabric; And a drying stroke determining step of determining a drying stroke according to the determined initial moisture content of the cloth. The method according to claim 1 or 2, The drying total load determination step is the drying control method of the laundry dryer, characterized in that the same as the normal dehydration load determination. The method according to claim 1 or 2, The step of determining the moisture content of the fabric includes turning on the heater and rotating the fan, and determining the moisture content of the fabric by measuring a temperature increase after the heating of the heater and the rotation of the fan are performed for a predetermined time. How to control the drying of the dryer. The method according to claim 1 or 2, The moisture content determining step of the cloth is a drying control method of the laundry dryer, characterized in that for determining the water content of the cloth by rotating the fan and measuring the absolute humidity of the drying load. The method of claim 1, The drying step, the drying control method of the laundry dryer, characterized in that the drying process is terminated if the moisture content of the fabric during the drying process is less than the drying end set moisture content. The method of claim 1, In the drying step, if the washing process, the drying process and the dehydration rate are selected by the user, and the dehydration rate of the washing process exceeds the dehydration rate selected by the user, the drying process is performed immediately without performing the dehydration process. The drying control method of the laundry dryer characterized by the above-mentioned.

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