KR101335154B1 - A control method of a dishwasher - Google Patents

Abstract

The present invention relates to a control method of a dishwasher.
In the control method of the dishwasher according to an embodiment of the present invention, a dish comprising a washing space for storing the dish, a sump for washing water supplied to the washing space and a drain pump for draining the washing water collected in the sump In the washing machine, the power is applied to the drain pump, generating a rotational force; Detecting the rotation speed of the drain pump; Recognizing whether there is a section in which the drain pump is not rotated; And if the section in which the drain pump is not rotated is repeatedly recognized more than a first set number of times, the restraint mode of the drain pump is performed.

Description

Control method of a dishwasher {A control method of a dishwasher}

An embodiment of the present invention relates to a control method of a dish washing machine.

In general, the dishwasher is a device for washing dishes by spraying the washing water to the dishes with food or dirt.

As shown in FIG. 7, the dishwasher may supply clean washing water to a summ provided on one side of the washing tank, and then a washing stroke may be performed in which the washing water spraying mechanism sprays the washing water to the dishes in the washing tank to wash the dishes. There is (S1).

The wash water used to wash the dishes is recovered to the sump and then supplied back to the wash water injection mechanism through the filter device in the sump. In the cleaning process, detergents for washing dishes can be used.

When the washing stroke is completed, a rinsing stroke may be performed to wash away the foreign matter or detergent, etc., stained from the dishes (S2).

At the end of each of the washing and rinsing cycles of the dishes, a draining process for draining the washing water present in the washing tank and the sump to the outside is performed. The drainage process performed in the washing stroke is called a first drainage process, and the drainage process performed in the rinsing stroke is called a second drainage process.

In the drainage process, the foreign matter filtered by the filter device may be discharged to the outside of the dishwasher together with the washing water.

On the other hand, in the process of draining the wash water, when a large amount of foreign matter or a large amount of foreign matter, the phenomenon that the foreign material is caught in the drain pump may occur, in this case, the drainage operation is not easily made.

According to the conventional dishwasher, as described above, even if the drainage pump is caught in the foreign matter, even if the drainage is not made well, the drainage pump continues to operate because there is a problem that the drainage pump is overloaded accordingly .

In addition, since such a phenomenon continues to appear, a failure occurs in the drainage pump, and a drainage action is not performed smoothly, thereby reducing the reliability of the operation of the dishwasher.

The present invention is to solve the above problems, an object of the present invention to provide a control method of the dishwasher for easily detecting the operation of the drain pump.

In the control method of the dishwasher according to an embodiment of the present invention for achieving the above object, to wash the dish is accommodated, the sump and the washing water collected in the sump and the washing water collected in the sump to drain In the dishwasher comprising a drain pump for, the power is applied to the drain pump, generating a rotational force; Detecting the rotation speed of the drain pump; Recognizing whether there is a section in which the drain pump is not rotated; And if the section in which the drain pump is not rotated is repeatedly recognized more than a first set number of times, the restraint mode of the drain pump is performed.

In another embodiment, a control method of a dishwasher includes a washing space for storing dishes, a sump for collecting wash water supplied to the washing space, and a drain pump for draining the washing water collected in the sump. The method of claim 1, wherein power is applied to the drain pump to generate rotational force; Detecting the rotation speed of the drain pump; And determining whether draining of the drain pump is completed based on whether the rotation speed of the drain pump reaches a set rotation speed.

According to the control method of the dish washing machine according to the embodiment of the present invention, there is an advantage that it is easy to check whether the foreign matter is caught by detecting the rotation speed of the drain pump.

In addition, by repeatedly comparing the actual rotation speed and the set rotation speed of the drain pump has an effect that can determine the level of foreign matter jamming.

In addition, the presence or absence of foreign matter is displayed to monitor the normal operation of the drain pump, and thus there is an effect that it is easy to detect and repair the failure of the drain pump.

In addition, since the drain pump can be maintained in a normal operating state, there is an effect that it is possible to prevent the odor is generated by the foreign matter caught in the drain pump.

In addition, the discharge of foreign matter can be easily made, there is an effect that the reliability of the user's product can be increased.

1 is a cross-sectional view of a dish washer according to an embodiment of the present invention.
2 is a bottom view of a sump according to an embodiment of the present invention.
3 is a cross-sectional view showing a partial configuration of a sump according to an embodiment of the present invention.
Figure 4 is a block diagram showing the configuration of a dish washer according to an embodiment of the present invention.
5 is a flowchart illustrating a control method of a dish washing machine according to an embodiment of the present invention.
6 is a flow chart showing an operation mode when restraining the drain pump according to an embodiment of the present invention.
7 is a flowchart illustrating a control method of a conventional dish washing machine.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.

1 is a cross-sectional view of a dish washer according to an embodiment of the present invention, FIG. 2 is a bottom view of a sump according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view showing a partial configuration of the sump according to an embodiment of the present invention. .

1 to 3, a dish washing machine 1 according to an embodiment of the present invention includes a case 10 forming an appearance and a tub 11 accommodated in the case 10 to form a washing tub. ), A door 12 provided at the front of the tub 11 to open and close the washing tank, and a sump 20 provided below the tub 11 and storing the washing water.

Inside the tub 11, a lower rack 14 and an upper rack 13 in which dishes are stored are provided. The upper rack 13 is disposed above the lower rack 14 by a predetermined distance. In addition, the upper rack 13 and the lower rack 14 may be guided by a guide rail (not shown) provided on the inner surface of the tub 11, and may be drawn out to the front of the tub 11.

Above the sump 20, a lower nozzle 17, an upper nozzle 16, and a top nozzle 15 are provided to allow the washing water supplied from the sump 20 to be injected into the washing tank.

In detail, the lower nozzle 17 is coupled to the upper side of the sump 20 to spray the washing water to the lower portion of the washing tank, and the sprayed washing water is directed to the dishes mounted on the lower rack 14. In addition, the sump 20 is provided with a lower nozzle coupler 19 coupled to the lower nozzle 17.

The upper nozzle 16 is located at the center of the washing tank and sprays the washing water toward the upper rack 13, and the top nozzle 15 is disposed at the ceiling of the tub 11 to spray the washing water downward. do.

Inside the tub 11, a washing water guide 40 is provided to move the washing water supplied from the washing pump 70. In addition, the sump 20 is provided with a guide connecting portion 64 connected to the wash water guide 40.

The washing water moved through the washing water guide 40 may be sprayed toward the upper rack 13 through the top nozzle 15 and the upper nozzle 16.

In the sump (20), washing water washing the dishes in the tub (11) is introduced, and the filter unit (110, 120, 130) to filter the foreign material in the washing water, and the washing water filtered through the filter unit (110, 120, 130) A washing pump 70 for pumping and a passage opening / closing part 80 for switching and opening / closing the flow path so that the washing water passing through the washing pump 70 flows to the lower nozzle 17 or the washing water guide 40 are included.

In detail, the filter unit 110, 120, 130, the first filter unit 110 as a pre-filter disposed on the sump 20, and a relatively large foreign material of the washing water introduced from the tub 11 is filtered out The second filter unit 120 and the third filter unit 130 which is provided on the outside of the second filter unit 120 to allow a relatively fine foreign material in the wash water is included.

The second and third filter parts 120 and 130 are accommodated in the filter housing 25. The filter housing 25 has a shape recessed downward, and defines a filter chamber as a space in which the second and third filter parts 120 and 130 are accommodated.

On the lower side of the filter housing 25, a pump inlet 28 is provided to allow filtered wash water to flow into the wash pump 70. The pump inlet 28 extends out of the filter housing 25.

The washing water stored in the sump 20 may flow to the pump inlet 28 through the filter parts 110, 120, and 130 by the suction force of the washing pump 70.

The washing pump 70 includes a washing motor (not shown) providing a driving force and an impeller portion (not shown) rotatably provided by a driving force of the washing motor. In addition, one side of the Sepkuck pump 70 is provided with a pump outlet 78 through which the washing water is discharged from the washing pump 70.

The flow path opening and closing portion 80 is connected to the pump discharge portion 78. The flow path opening and closing portion 80 includes an opening and closing valve 82 for adjusting the flow path of the washing water and an opening and closing drive part 81 for driving the opening and closing valve 82. The washing water introduced into the flow path opening and closing portion 80 may flow to the lower nozzle coupling portion 19 or the guide connection portion 64 while passing through the opening and closing valve 82.

That is, when the washing water to be flowed to the lower nozzle 17, the washing water is moved to the lower nozzle coupling portion 19 by the operation of the opening and closing valve 82, the upper nozzle 16 or the top nozzle ( 15, it may be moved to the guide connection 64.

The top nozzle 15, the upper nozzle 16 and the lower nozzle 17 are selectively opened so that the washing water may be sprayed only through some of the nozzles 15, 16 and 17, and the nozzle ( Both 15, 16 and 17 may be open such that wash water may be sprayed through all of the nozzles 15, 16 and 17.

The sump 20 includes a drain pump 90 that provides suction power for draining the wash water. And, between the filter housing 25 and the drain pump 90, a drain 29 for draining the washing water and foreign matter is provided.

The drain 29 extends outward of the filter housing 25 in a direction different from that of the pump inlet 28. The filter housing 25 is provided with a discharge port 29a defining an inlet of the drain 29. The outlet 29a is formed at the lower end of the filter housing 25.

When the drain pump 90 is driven, the washing water stored in the sump 20 goes to the outside of the filter housing 25 through the outlet 29a together with the foreign matter remaining in the filter housing 25. Discharged.

The washing water and the foreign matter may be discharged to the outside of the dishwasher through the drainage part 29 and the drainage pump 90.

Figure 4 is a block diagram showing the configuration of a dish washer according to an embodiment of the present invention.

Referring to FIG. 4, in the dishwasher 1 according to the embodiment of the present invention, a rotation speed for detecting the rotation speed of the drain pump 90 and the drain pump 90 driven for discharging the washing water or the foreign matter The sensing unit 141 is included.

The drain pump 90 includes a drain motor 90a for generating a driving force and an impeller portion 90b rotatably provided in a predetermined direction by the driving of the drain motor 90a. The drain motor 90a and the impeller portion 90b may be coupled by a shaft (not shown).

The drain motor 90a may be a bidirectional motor capable of forward rotation or reverse rotation. The impeller 90b may be rotated in a clockwise or counterclockwise direction according to the driving of the drainage motor 90a.

The rotation speed detecting unit 141 may be provided at one side of the drain pump 90 so as to detect the rotation speed or the rotation angle of the drain motor 90a or the impeller 90b.

The rotation speed detecting unit 141 may include an angle (speed) sensor or an encoder. However, if the rotation speed (rotation angle) of the drain pump 90 can be detected, the type of the rotation speed detection unit 141 will not be limited to any one.

The dishwasher 1 further includes a timer 142 capable of integrating time elapsed with respect to the operation of the drain pump 90. The timer 142 may accumulate the time elapsed since the drain pump 90 is operated or the time at which the drain pump 90 is driven at a specific rotation speed.

The dishwasher 10 further includes a counter 143 for integrating the number of times of detecting a specific rotational speed of the drain pump 90 or the number of times of repeating the control mode logic of the drain pump 90. Included. The number of times accumulated in the counter 143 may be a control reference for driving the drain pump 90 or the dishwasher 1.

In the dishwasher 1, the driving state of the drain pump 90, that is, the normal operation or the foreign matter is caught based on the information detected by the rotation speed detecting unit 141, the timer 142, and the counter 143. The display unit 160 to display whether or not is included. For convenience of description, the rotation speed detecting unit 141, the timer 142, and the counter 143 may be referred to as a “detecting device”.

The dishwasher 1 further includes a controller 150 for controlling the driving of the drain pump 90 or the dishwasher 1 based on the information detected by the sensing device.

The operation of the dish washing machine according to the present embodiment will be briefly described.

When the drain pump 90 is driven, the rotation speed of the drain motor 90a or the impeller portion 90b may be detected. Then, a time elapsed value corresponding to the rotation speed may be detected.

Depending on whether or not the specific rotational speed is maintained for a predetermined time, it may be recognized whether the drain pump 90 is normally operated or whether foreign matter is caught in the drain pump 90.

Then, according to the number of times of detecting the rotation speed or the number of times that a specific control mode is performed, the degree of foreign matter hanging on the drain pump 90 may be determined for each level. The determined result information may be displayed externally through the display unit 160. In this regard, it will be described later with reference to the drawings.

5 is a flow chart showing a control method of a dish washer according to an embodiment of the present invention, Figure 6 is a flow chart showing an operation mode when restraining the drain pump according to an embodiment of the present invention. 5 and 6, the control method of the dish washing machine according to an embodiment of the present invention will be described.

When the washing and rinsing strokes of the dishes stored in the dishwasher 1 are completed, a drainage mode for discharging the washing water and the foreign matter stored in the sump 20 may be performed. When the drainage mode is performed, power is applied to the drainage motor 90a, and the impeller portion 90b may be rotated by driving the drainage motor 90a (S11 and S12).

When drainage starts after driving the drainage pump 90, the rotation speed of the drainage pump 90 may be sensed at a preset setting cycle. The setting period may be 50ms.

After the start of drainage, it is determined whether there is a section in which the drain pump 90 is not rotated for more than a first predetermined time. The non-rotating section may be recognized that the rotation speed of the drain pump 90 is 0rpm. The first setting time may be 1 second as a preset value (S14).

When the rotation speed of the drain pump 90 is maintained for more than a first set time in a state of 0 rpm, it may be recognized that a predetermined foreign material is caught in the drain pump 90, and thus driving of the drain pump 90 is stopped. Can be interrupted. Here, the time interval during which the drain pump 90 is stopped driving may be, for example, one second.

Then, the number of times according to the detection result may be counted (n = n + 1). In one example, the detection count value may be an initial "1". It is determined whether the detection count value is two or more. If the number of times of detection is less than 2, the process returns to step S12, and the following steps are repeatedly performed.

Herein, the value of "2" may be understood as a "setting number value" regarding the number of detection times at which 0 rpm is detected during the first setting time. However, the set number of times may be preset to a value of 3 or more (S17).

In step S17, when the detection count value is equal to or greater than the set count value (in the drawing, 2 or more), even if the drain pump 90 is driven for a predetermined time, the drain pump 90 is recognized as a foreign matter. In addition, it may be determined whether the operation mode (hereinafter referred to as “binding mode”) when the foreign matter is restrained by the drain pump 90 is performed (S18).

The number of executions of the constraint mode may be counted (m = m + 1). For example, the number of times the constraint mode is performed may be the first "1". It is determined whether the number of executions of the restraint mode is 2 or more.

Here, the value of "2" may be understood as a "setting number value" regarding the number of times the restraint mode is performed. However, the set number of times may be preset to a value of 3 or more (S19, S20).

If the number of executions is less than 2, the restraint mode of the drain pump 90 may be performed (S22).

Referring to FIG. 6, the restraint mode performed by the drain pump 90 will be described.

When foreign matter is caught in the drain pump 90 and the restraint mode is performed, the control of the drain motor 90a for forward and reverse rotation of the impeller 90b may be performed (S32).

Under the control of the drain motor 90a, the impeller portion 90b may be rotated forward (for example, clockwise) and reversely (for example, counterclockwise). The forward and reverse rotations may be alternately performed for a predetermined time.

The set time may be about 3 seconds. That is, the impeller 90b may be rotated clockwise for about 3 seconds and then rotated counterclockwise for about 3 seconds. The set time may have a time value other than 3 seconds, and the forward rotation time value and the reverse rotation time value may have different values (S33).

It is determined whether the number of repetitions of forward rotation and reverse rotation of the impeller portion 90b has reached the set number of times. The set number of times is a preset value and may be five times. However, it may have a different number of times.

The impeller portion 90b alternately performs forward and reverse rotation, thereby inducing foreign matter to be separated from the drain pump 90. That is, the centrifugal force generated by the rotation of the impeller 90b may act on the foreign material (S34).

When the number of repetitions reaches the set number of times, the rotation of the impeller unit 90b is stopped. If the number of times of the repetition is not reached, the process returns to step S32 and the following steps are performed again (S35).

On the other hand, if the number of times performed in step S20 is 2 or more, it can be recognized that the drain pump 90 is completely constrained by foreign matter so that its operation is impossible. In addition, the "completely restrained state" may be displayed to the outside through the display unit 160.

That is, if the non-rotating state of the pump is repeated a predetermined number of times or more for a predetermined time after the start of drainage, and the non-rotating state is maintained even though the restraint mode of the drain pump 90 is performed a certain number of times, the drain pump It is recognized that the foreign object is severely hung on 90.

As a result, it is determined that the normal operation of the drain pump 90 is impossible, and it may be recognized and displayed that repair is necessary in order to dismantle the foreign material from the drain pump 90 (S21).

On the other hand, if the non-rotation state (0rpm) is not detected for more than the first set time after the start of the drain in step S14, it is detected whether the drain stroke is completed (S23).

After the start of drainage, it is determined whether A rpm has been detected for more than a second predetermined time.

The second set time may be understood as a time condition for stably detecting the A rpm in consideration of a situation in which the rotation speed is suddenly changed due to a misdetection of the sensing device or a predetermined other cause. Here, the second set time may be 2 seconds.

On the other hand, the A rpm should be detected within the "set elapsed time" after the start of drainage. The set elapsed time may be determined in consideration of the amount of washing water supplied to the dishwasher, the amount of drainage per second based on the capacity of the drain pump 90, and the like. For example, the set elapsed time may be about 70 seconds.

Therefore, when the A rpm is detected after the set elapsed time, it may be understood that the draining action is delayed due to a specific cause (for example, a foreign matter catching action) or the draining is not completed (S24).

After the start of drainage, if the A rpm is detected for more than a second set time within the set elapsed time, it is recognized that the washing water or foreign matter present in the sump 20 is completely drained.

Here, the A rpm can be understood as the number of revolutions when the drainage is completed, when freely rotated without external load (wash water or foreign matter). For example, the A rpm may be 4,000 rpm.

In addition, when it is recognized that the drainage is completed by the drainage pump 90, the display 160 may display a “drainage completion” indication, and the dishwasher 1 may be a later stroke, for example, a drying stroke or Further washing administration may be performed (S25).

On the other hand, after the start of drainage in step S24, if the A rpm is not detected for more than a second predetermined time, it is recognized that the wash water or foreign matter remains in the sump 20. For example, although the drainage is made by the operation of the drain pump 90, the foreign matter is caught by the drain pump 90, it can be expected a state that the drainage of the washing water is not smoothly made. .

In this case, the number of times according to the detection result may be counted (ℓ = ℓ + 1). In one example, the detection count value may be an initial "1". It is determined whether the detection count value is two or more. If the number of times of detection is less than 2, the process returns to step S12, and the following steps are repeatedly performed.

Here, the value of "2" may be understood as the "setting number value" regarding the number of times that the A rpm is detected for more than a second setting time. However, the set number of times may be preset to a value of 3 or more.

For convenience of description, the number of detections and the setting count counted in step S16 are called "first detection count" and "first setting count", respectively, and the counting count and the setting count counting count in this step are "second detection". Number "and" second set number "may be referred to (S26, S27).

When the second detection frequency is greater than or equal to the second predetermined number of times, the drainage pump 90 may be recognized as a state in which drainage is not completed even though the drain pump 90 is driven for a predetermined time, and thus may be recognized as a semi-constrained state.

Here, the "half-blocking state" is not a state in which foreign matter is caught in the drain pump 90 and completely restrained (that is, the driving of the pump is limited) as in step S21, but the process of operating the drain pump 90 is performed. It can be understood as "in-operation restraint state" in which drainage is not performed smoothly.

That is, the "half restraint state" may be understood as a "strain state" in which the restraint occurs in the drain pump together with the "full restraint state" (S28).

In addition, the result of the recognized “half restraint state” may be displayed on the display unit 160, and the drain pump 90 may be repaired according to the displayed result.

As described above, it is possible to recognize the jam state of the foreign matter by detecting the rotation speed of the drain pump, and the degree of jam of the foreign material can be determined based on the number of times of detection of the rotation speed or the repetition frequency of a specific control mode. There is an effect that the action for control or failure can be easily made.

20: sump 28: pump inlet
29: drain 29a: outlet
70: washing pump 90: drainage pump
90a: drainage motor 90b: impeller part
141: rotation speed detection unit 142: timer
143: counter 160: control unit

Claims (12)

In the dishwasher including a washing space for storing dishes, a sump for washing water supplied to the washing space and a drain pump for draining the washing water collected in the sump,
Power is applied to the drain pump to generate rotational force;
Detecting the rotation speed of the drain pump;
Recognizing whether there is a section in which the drain pump is not rotated; And
And if the section in which the drain pump is not rotated is repeatedly recognized more than a first predetermined number of times, the restraint mode of the drain pump is performed. The method of claim 1,
If there is no section in which the drain pump is not rotated, the control method of the dishwasher further comprises a step of recognizing whether or not the rotation speed of the drain pump reaches a set rotation speed. 3. The method of claim 2,
And when the rotation speed of the drain pump reaches the set rotation speed, it is determined that the drainage of the washing water collected in the sump is completed. The method of claim 3, wherein
And when the rotational speed of the drain pump reaches the set rotational speed after a predetermined elapsed time, drainage of the washing water is delayed or it is determined that drainage is not completed. 3. The method of claim 2,
And detecting that the rotation speed of the drain pump does not reach a set rotation speed, and that the detected drainage pump is recognized as a semi-constrained state when the counting count is repeated more than a second predetermined number of times. The method of claim 1,
In the restraint mode of the drain pump,
The control method of the dishwasher including the operation that the forward and reverse rotation of the drain pump alternately performed repeatedly. The method of claim 1,
In the state in which the confined mode of the drain pump is repeated a predetermined number of times, when the non-rotating section is recognized, the drain pump is recognized as a fully confined state. In the dishwasher including a washing space for storing dishes, a sump for washing water supplied to the washing space and a drain pump for draining the washing water collected in the sump,
Power is applied to the drain pump to generate rotational force;
Detecting the rotation speed of the drain pump; And
And if the drain pump is not rotated by the first set number of times, forward and reverse rotation of the drain pump is performed. The method of claim 8,
If the rotation speed of the drain pump reaches the set speed within the set elapsed time, the drainage of the drain pump is recognized as complete,
And if the set speed has not been reached within the set elapsed time, the drain of the drain pump is recognized as not completed. delete The method of claim 8,
And when it is detected that the drainage pump is not rotated while the forward and reverse rotation of the drainage pump is repeatedly performed a predetermined number of times, the drainage pump is determined to be in a completely restrained state. The method of claim 9,
Counting the number of recognition times if it is recognized that the rotation speed of the drain pump does not reach the set rotation speed within the set elapsed time; And
And if the counting number is detected by a second set number, the drain pump is determined to be in a half-restricted state.

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