KR20050122469A - Method for controlling of drum type washer with automatically dry - Google Patents

Abstract

The present invention relates to a control method of an automatic drying drum washing machine which prevents abnormality detection of a temperature sensing sensor that detects a drying progress state at the time of automatic drying, thereby increasing the reliability of the automatic drying operation. In the control of the washing machine having the automatic drying function for determining the drying degree, the drying mode is determined before the drying is started, and when the drying mode is automatic drying, the drying start and the supply of the condensate are started at the same time. In the case of drying for a set time, the drying is started to enable accurate drying by starting the supply of condensed water after the internal temperature is raised by driving the heater.

Description

Control Method for Automatic Dry Drum Washing Machine {Method for controlling of drum type washer with automatically dry}

The present invention relates to a washing machine, and more particularly, to a control method of an automatic drying drum washing machine which prevents abnormality detection of a temperature sensing sensor that detects a drying progress state during automatic drying, thereby increasing the reliability of the automatic drying operation.

In general, the drum washing machine is a method of washing the laundry by using the friction force of the rotating drum and the laundry by receiving the driving force of the motor unit in the state in which detergent, washing water and laundry are put into the drum. It doesn't get tangled, and the pounding and rubbing pad is designed to have a laundry effect.

In addition, in accordance with the trend of functional improvement and high-end of the drum washing machine, there is a trend of increasing the demand of the combined drum washing machine which can perform the washing and dehydration function of the laundry in the drum washing machine as well as the drying function.

Such a combined drum washing machine forcibly draws outside air into a fan and a heater installed outside the tub, heats it, and blows the heated hot air into the tub to dry the laundry.

Hereinafter, the automatic drying drum washing machine and the automatic drying algorithm of the prior art will be described with reference to the accompanying drawings.

1 is a perspective view illustrating a configuration of an automatic drying drum washing machine, and FIG. 2 is a sensing profile of a temperature sensor during automatic drying of the automatic drying drum washing machine of FIG. 1.

In general, the combined drying drum washing machine performs a drying process by selecting a drying course desired by the user and setting an appropriate drying time according to the amount of laundry. It could not be completely dried or, on the contrary, overdried to satisfy the desired drying conditions.

One method for solving this problem is a drum washing machine having an automatic drying apparatus as shown in FIG. 1.

As shown in FIG. 1, both ends of the duct 12 are installed at one side of the tub 11 so as to communicate with the front and the rear of the tub 11 to form a circulation flow path of the heating air, and the duct 12 An upper temperature sensor (A1) 15 and a lower temperature sensor (A2) 16 for sensing a temperature are respectively configured on the upper and lower portions of the vertical part inside.

The upper temperature sensor 15 and the lower temperature sensor 16 transmit the detected temperature to a control unit (not shown) of the drum washing machine in real time, and the control unit dry the detected temperature according to a pre-input control algorithm. The operation of the blower fan 14 and the heater 13 is controlled by determining the progress.

Here, the A1 and A2 points at which the upper temperature sensor 15 and the lower temperature sensor 16 are configured are changed in temperature of water in which air circulated through the duct 12 and cooling water and condensate are mixed as the drying stroke proceeds. It is the position that can detect the most appropriately.

The reason for configuring the temperature sensor at the A1 and A2 points is as follows.

As the drying stroke is completed, the temperature at A1 and A2 is remarkably different, which absorbs the moisture of the laundry in the tub 11 and condensates through the condensation process as the circulating air passes through the duct 20. The lower end of the duct 12 is collected, and as the drying is completed, the amount of condensate collected at the lower end of the duct 12 is reduced, so that the temperature of A2 is lower than that of A1.

The process of detecting temperature change and determining the drying degree using the same are as follows.

In the condensing dry method, after the dehydration stroke is completed, high-temperature, low-humidity air is introduced into the tub, and the air introduced into the tub absorbs the moisture of the laundry, converts it into high-temperature, high-humidity air, passes through the duct, By repeating the process of changing to low temperature and low humidity air to dry the laundry.

Here, the air converted into a low temperature and low humidity state by the condensation process becomes high temperature low humidity air by a heater and flows back into the tub.

In this drying process, the temperature change at the A2 point is the same as in FIG. 2.

First, in the beginning of the drying (drying dry) there is a lot of moisture contained in the laundry in the tub 11, so that the low temperature low humidity air (Cooling water) passes through the duct 12 and collects at the lower end of the duct 12 and Condensate is not high in quantity and low temperature.

In this state, there is almost no temperature difference detected at A1 and A2.

In the middle dry, hot air is continuously introduced by heating to remove moisture contained in the laundry in the tub 11, and thus the temperature of the tub is increased. Done.

At this time, the amount of condensate is increased at the lower end of the duct 12 rather than the cooling water, thereby maintaining a high temperature state.

And in the end of drying (End Dry), the moisture contained in the laundry is removed to some extent high temperature and low humidity air passes through the duct 12.

At this time, since the dryness of the laundry is high in the lower end of the duct 12, the condensate water decreases and the cooling water increases, thereby maintaining a low temperature state.

In this state, there is a temperature difference detected at A1 and A2, because the amount of coolant is increased and the lower temperature sensor located at A2 is affected.

As described above, the temperature measured by the upper temperature sensor 15 and the lower temperature sensor 16 shows almost the same profile at the beginning and the middle of the drying stroke, but the temperature measured by the lower temperature sensor 16 at the end of the drying stroke. The temperature is gradually lowered, and the temperature measured by the upper temperature sensor 15 gradually rises to gradually increase the temperature difference measured by the two temperature sensors.

In this way, if the deviation ΔT of the temperature detected by the two temperature sensors is increased by a certain degree, the control unit determines that the drying stroke is completed.

However, in the progress of the drying process of the drum washing machine having the automatic drying function of the prior art, there are the following problems.

The drying stroke can be divided into 'automatic drying' and 'time drying', and it is called 'automatic drying' to detect the quantity and drying degree and dry it to an appropriate drying level. Drying only for the selected time is called 'time drying'.

In the prior art automatic drying method, condensate for drying is supplied at the same time in both time drying and automatic drying.

The condensate is not supplied at the start of drying in order to save energy for operating the heater, and the condensate is supplied after the heater raises the internal temperature to some extent, that is, after a predetermined time passes at the start of drying.

This is to prevent the increase in the temperature of the heater to increase the total drying time when the supply of condensed water at the beginning of hay.

However, in the case of supplying condensate in this manner, there is no problem in the time drying mode, but in the case of the automatic drying mode, the following problem occurs.

In the automatic drying mode, if condensate is supplied after a certain time without supplying condensate at the start of drying, the condensate is supplied when the temperature inside the duct rises to some extent.

When condensed water is supplied in the state where the temperature inside the duct is raised in this manner (when (a) of FIG. 3 is the condensed water supply point), the temperature of the lower temperature sensor is drastically lowered so that the temperature difference between the upper temperature sensor and the lower temperature sensor is decreased. It becomes a value more than (DELTA) T (the reference difference value judged as complete drying).

Therefore, the control unit determines that the drying is completed even though the laundry is not actually dried, and ends the drying stroke.

That is, as shown in Fig. 3, the difference between the detected temperature difference between the upper temperature sensor and the lower temperature sensor at the end of drying should be ΔT, but the temperature of the two temperature sensors A1 and A2 at the part (a) to which the condensed water is supplied. The difference is ΔT, so that no accurate dryness judgment is made.

This causes a decrease in the reliability of the product.

The present invention is to solve the problem in the drying stroke of the drum washing machine having the automatic drying function of the prior art, by preventing the abnormality detection of the temperature sensor to detect the drying progress during automatic drying reliability of the automatic drying operation An object of the present invention is to provide a control method of an automatic drying drum washing machine.

In the control method of the automatic drying drum washing machine according to the present invention for achieving the above object, in the control of the washing machine having an automatic drying function to determine the dryness by using the humidity change according to the progress of the drying stroke, the drying is started If the drying mode is automatic drying, drying starts and supply of condensed water is started at the same time. If drying time is set by the user, drying starts. It is characterized in that the supply of condensate is started after the temperature is raised.

Here, in the time drying mode, starting the heater and counting the elapsed time from the start of drying when the drying is started; starting the supply of condensed water after a preset time; during the drying time set by the user It characterized in that it comprises the step of proceeding with the drying and ending.

Here, in the automatic drying mode, starting the supply of condensed water while starting the drying; using the temperature value detected by the upper and lower temperature sensors configured at the upper and lower ends of the flow path through which the heating air for drying is circulated Determining the degree of dryness; characterized in that it comprises the step of ending the drying stroke in accordance with the dryness determination result.

As the drying stroke progresses, the difference between the sensing temperature value of the upper temperature sensor and the sensing temperature value of the lower temperature sensor that detects the temperature change of the air circulating, the water mixed with the cooling water and the condensate becomes a set temperature value ΔT. It is characterized by determining that the desired dryness.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of the embodiments.

Referring to the accompanying drawings, a preferred embodiment of a control method of an automatic drying drum washing machine according to the present invention will be described in detail as follows.

4 is a flow chart illustrating a method for automatic drying according to the present invention.

The present invention is to increase the accuracy of the determination of the drying, the drying mode is divided into 'automatic drying' and 'time drying' to change the supply time of the condensate.

In other words, sensing the amount of dryness and drying degree to dry to an appropriate drying level in the 'automatic drying' mode to supply the condensed water immediately after the start of drying or immediately after the start of drying in order to prevent abnormality detection of the temperature sensor for determining the dryness.

In addition, in the 'time drying' mode, in which the user dries only for the time selected at the beginning of drying regardless of the dryness of the laundry, condensed water is supplied after a certain time for energy saving.

First, as shown in FIG. 4, when the dehydration process is completed, the drying process is performed by the user's selection or by detecting the internal humidity in a direct or indirect manner, and continuing to dry until the humidity level is appropriate. It is determined whether the drying mode is automatic (S401).

If the drying mode is time drying, the heater is started to start drying (S402) and the condensed water is not supplied until the heater raises the internal temperature to a predetermined level.

As such, when the heater is operated without supplying the condensed water and the preset time is reached (S403), the condensed water is supplied (S404).

Of course, the temperature sensing using the upper temperature sensor and the lower temperature sensor and the dryness determination using the same are not made.

In this way, the drying stroke is performed while supplying the condensed water, and when the time set by the user is reached (S405), the drying stroke is terminated (S411).

If it is determined in the drying mode determination step (S401) that the drying mode is the automatic drying mode, the heater is started to start drying and the condensed water is supplied (S407).

Condensate is supplied at the same time as the start of drying, or is supplied in a state in which the temperature inside immediately after the start of drying has not increased much.

As the drying proceeds as described above, the temperature changed by the upper temperature sensor A1 and the lower temperature sensor A2 is sensed.

Here, the upper temperature sensor (A1) and the lower temperature sensor (A2) are installed so that both ends of the duct communicate with the front and rear of the tub to constitute a circulation flow path of the heating air, respectively, the upper and lower portions of the vertical portion inside the duct Is configured on.

The upper temperature sensor and the lower temperature sensor are delivered to the control unit of the drum washing machine in real time, and the control unit controls the heater by determining the progress of drying according to the input control algorithm.

The control unit calculates the temperature difference value ΔT between A1 and A2 using the detected values of the upper temperature sensor A1 and the lower temperature sensor A2 (S409).

Then, the process of comparing the temperature detection value and the temperature difference value ΔT with the set temperature value is repeated while drying is continued until the temperature difference value ΔT obtained is compared with the set temperature value (S41). .

If the obtained temperature difference value ΔT is equal to or higher than the set temperature value, it is determined that the user has a desired degree of drying, and the drying process ends.

Here, the set temperature value is set differently for each drying course required by the user, and the drying course may be divided into an ironing course, a general drying course, and a steel drying course.

And before the completion of the drying process, drying by the heater driving is carried out, and cold air drying to lower the temperature of safety and laundry is performed.

The drying control method according to the present invention is the position where the upper temperature sensor and the lower temperature sensor can detect the temperature change of the air circulating through the duct as the progress of the drying stroke and the water mixed with the cooling water and the condensate most appropriately It is possible to make consistent and accurate drying for all batches by determining the dryness by using it.

In addition, in the automatic drying mode, the condensed water may be supplied at the start or just after drying to prevent abnormality detection of the temperature sensor due to the supply of the condensed water, thereby increasing the precision of the drying degree.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Such a control method of the automatic drying drum washing machine according to the present invention has the following effects.

First, in the automatic drying mode, the condensed water may be supplied immediately after the start of drying or immediately after drying to prevent abnormality detection of the temperature sensor according to the supply of the condensed water, thereby increasing the accuracy of drying degree determination.

This has the effect of increasing the product reliability of the user.

Second, in the time drying mode selected by the user, after the drying starts, the heater raises the internal temperature to an appropriate level and supplies condensed water, thereby saving energy for operating the heater.

1 is a perspective view showing the configuration of an automatic drying drum washing machine

FIG. 2 is a sensing profile of a temperature sensor during automatic drying of the automatic drying drum washing machine of FIG.

3 is an abnormality detection profile of the temperature sensor during automatic drying according to the conventional automatic drying method

4 is a flow chart showing a method for automatic drying according to the invention

Claims (4)

In the control of the washing machine having an automatic drying function for determining the dryness by using the humidity change in accordance with the progress of the drying stroke, Determine the drying mode before drying starts, If the drying mode is automatic drying, start drying and supply of condensate at the same time.In case of time drying set by the user, drying starts and drying of condensate after the internal temperature is raised by the operation of the heater. The control method of the automatic drying drum washing machine characterized by starting the supply. The method according to claim 1, wherein in the time drying mode, Counting the elapsed time from the start of drying if the drying is started by starting the heater; Starting the supply of condensate after a preset time elapses; The method of controlling the automatic drying drum washing machine comprising the step of proceeding to dry during the drying time set by the user. The method of claim 1, wherein in the automatic drying mode, Starting the supply of condensate while starting drying; Determining a drying degree using temperature values detected by upper and lower temperature sensors configured at upper and lower ends of a passage through which heated air for drying is circulated; And a step of terminating the drying stroke according to the result of the determination of the degree of drying. The temperature value of claim 3, wherein a difference between a sensing temperature value of the upper temperature sensor and a sensing temperature value of the lower temperature sensor that detects a temperature change of air circulating as the drying stroke and water in which cooling water and condensed water are mixed is set. (ΔT), the control method of the automatic drying drum washing machine characterized in that it is determined that the desired dryness.