KR101377963B1 - The control method for a dishwasher - Google Patents

Abstract

The present invention relates to a control method of a dishwasher, and more particularly, to a control method of a dishwasher so as to accurately supply the required amount of washing water during the washing and rinsing stroke. According to the present invention, in the dishwasher which is controlled to supply water for a set time, in order to overcome the error of the water supply amount according to the installation state of the impeller installed in the water supply passage, the impeller is rotated by the reference rotation speed when water supply It can be achieved by the control method of the dishwasher to determine the water supply correction amount by comparing the time taken to the preset reference time.

Therefore, the present invention, even when a problem occurs in the impeller formed in the water supply flow path of the dishwasher, by correcting the amount of the washing water to be detected by correcting the amount of water required to supply the required amount of washing water to improve the cleaning efficiency Have

Description

The control method for a dishwasher}

The present invention relates to a control method of a dishwasher, and more particularly, to a control method of a dishwasher so as to accurately supply the required amount of washing water during the washing and rinsing stroke.

In general, the dishwasher refers to a device that automatically removes food debris, such as rice paste attached to the tableware, by spraying with high-pressure washing water to automatically remove and dry the food debris.

FIG. 1 is a longitudinal cross-sectional view schematically illustrating a conventional dish washing machine. Hereinafter, a conventional dish washing machine will be described with reference to FIG. 1.

The dishwasher 1 is a device for washing dishes by spraying washing water on the dishes. The dishwasher 1 forms an outer shape, a tub 3 having a dish washing tank 3a formed therein, and a lower portion of the tub 3a for supplying high-pressure washing water to the washing tank 3a. It comprises a part 5 (hereinafter, referred to as a "drive part mounting part") in which the electrical equipment and the like are installed.

The washing tank 3a and the driving unit installing unit 5 are described as follows.

The front door 7 which can be opened and closed is installed in the front of the washing tank 3a. An upper rack 12 and a lower rack 14 on which dishes are placed are installed in the washing tank 3a, and an upper spray arm 32 for spraying washing water on the lower part of the upper rack 12 and the lower rack 14. ) And the lower injection arm 34 are disposed respectively. And the heater 13 which heats wash water to predetermined temperature is provided in the lower part of the washing tank 3a.

On the other hand, the driving unit installation portion 5 is provided with a sump (9) for receiving the wash water, the sump (9) pumping the wash water to the upper injection arm 32 and the lower injection arm 34 of the washing tank (3a) A sending wash pump is installed. In general, the sump 9 and the upper injection arm 32 and the lower injection arm 34 are connected by the upper connection pipe 322 and the lower connection pipe 324.

In addition, the washing pump is usually provided with a motor 11 for generating a driving force. At this time, the motor 11 is installed on the side of the sump (9), the washing water accommodated in the sump by the driving force of the motor by circulating through the washing flow path.

On the other hand, the outer surface of the tub 3 is provided with a water supply device (not shown) for delivering the washing water to the sump (9) to the sump (9) provided on the bottom of the washing tank (3a). The water supply device is connected to an external water supply source and supplies washing water to the inside of the sump. At this time, the water supply device includes an impeller installed on the flow path for washing water, and the washing water is supplied to the sump through the water supply passage with the rotation of the impeller.

In supplying water to the dishwasher, the amount of water is controlled using a predetermined time which is generally set to supply an appropriate amount of washing water to the sump.

However, in the case of controlling the amount of water to be supplied based on time in this way, there may be a problem that the amount of water supplied to the sump varies depending on the internal state of the dishwasher even if the same time.

In particular, when the control is made based on time, there is a disadvantage in that the correct flow rate cannot be supplied due to the installation state of the impeller through which the washing water passes.

The present invention is to solve the above problems, when the water supply of the dishwasher is controlled based on a preset time, it is possible to correct the amount of washing water supplied by detecting the abnormality according to the conditions inside the dishwasher. The present invention provides a control method of a dishwasher.

An object of the present invention as described above, in the dishwasher which is controlled to supply water for a set time, in order to overcome the error of the water supply amount according to the installation state of the impeller installed in the water supply passage, the reference speed when the impeller water supply It can be achieved by the control method of the dishwasher to determine the water supply correction amount by comparing the time it takes to rotate by a predetermined reference time.

Specifically, the dishwasher is controlled so that the water supply is made for a set time, measuring the number of revolutions of the impeller installed in the water supply passage when water supply; Measuring a time at which the impeller rotates by a reference speed; And calculating a water supply correction amount by comparing the measured time with a preset reference time.

The method may further include correcting the water supply amount based on the calculated water supply correction amount. At this time, the step of correcting the water supply amount is preferably performed after the water supply for the set time.

Here, the step of correcting the water supply amount may be performed only when the measured time exceeds the reference time.

Therefore, the step of correcting the water supply amount may be performed by proceeding additional water supply for a time corresponding to the water supply correction amount.

In this case, when the measured time is less than the reference time, it is preferable to end the water supply after the water supply is performed for the set time.

On the other hand, the step of measuring the rotational speed of the impeller is preferably made at the same time as the water supply is started.

In addition, the object of the present invention as described above is a method of controlling a dishwasher including a plurality of water supply stages, at least one of the water supply stages and the time it takes for the impeller installed in the water supply passage to rotate by the reference rotational speed when water supply; Calculating a water supply correction value by comparing a preset reference time; In addition, the water supply time may be corrected by correcting the water supply time set by the calculated water supply correction value.

In this case, the water supply correction value may be based on a correction ratio for correcting the water supply time according to the rotational speed of the impeller, wherein the correction ratio is a value obtained by dividing the time taken to rotate by the reference rotation speed by the reference time. desirable.

When the time taken for the impeller to rotate by the reference speed is less than the reference time, the correction ratio may be controlled to be maintained at 1.

On the other hand, the plurality of times the water supply step may be made to include the step of calculating the water supply correction value and the water supply amount respectively.

Alternatively, the water supply correction value may be calculated only in the first water supply step of the plurality of water supply steps, and in the subsequent water supply step, the water supply time may be corrected by the calculated correction value.

According to the present invention, even if a problem occurs in the impeller formed in the water supply flow path of the dishwasher, it is detected by correcting the amount of water to be supplied to the bar to accurately supply the required amount of washing water to improve the cleaning efficiency Has an effect.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of a control method of a dish washer capable of realizing the above object in detail.

In the present embodiment, the present invention is applied using a dishwasher for supplying washing water using an air brake assembly. However, the present invention is not limited thereto. For example, the present invention may be applied to all dishwashers having an impeller installed on a water supply passage from which water is supplied from the outside.

In the meantime, the same constituent elements as those in the prior art are denoted by the same reference numerals and signs, and a detailed description thereof will be omitted.

2 is a configuration diagram schematically showing the structure of an air brake assembly.

Referring to Figure 2, the air brake assembly is formed on the bottom surface of the air brake 100 and the air brake is filled with the washing water is supplied, the water supply hose connector 110 and the washing water flowing in from the water supply pipe (not shown) and Inlet valve 111 (delet: inletvalve) for determining whether the inlet of the wash water flowing through the water supply hose connector 110, and the impeller 120 is installed in the flow path through which the wash water flowing into the water supply hose connector 110 is provided. Can be

On the other hand, the water softener connector 130 to allow the washing water introduced into the air brake 100 is moved to the softening device, and a regenerator for moving a portion of the washing water introduced into the air brake 100 to the regenerator 170. Connector 140 may be further included.

Therefore, the washing water obtained through the water supply hose connector 110 is moved upward along the water supply passage formed inside the air brake 100. At this time, as the washing water passes through the water supply passage, the impeller 120 formed in the water supply passage is rotated. Then, the supplied washing water is dropped into the center portion of the air brake 100 and collected in the water softener connector 130, and through the ion exchange resin filter formed in the softener 160 through the softener connector 130. It can be supplied to the sump 9 side.

Here, the impeller 120 is installed in the flow path of the water to be supplied is rotated as the water is introduced. Then, the water proceeds through the space between the wings of the impeller 120, the amount of water supplied is proportional to the number of revolutions of the impeller 120.

The dishwasher as described above receives an appropriate amount of washing water from the outside in order to clean the tableware according to the amount or state of the dishes accommodated therein.

In this case, in order to control the amount of the washing water, it is common to adjust the amount of the washing water by supplying water for a preset time according to the contents of the operation. This displays the operation remaining time for the convenience of the user using the dishwasher, in order to constantly calculate the time required for water supply.

Here, the time for the water supply is set by measuring the time in which a predetermined amount of the washing water is introduced by the experiment, the amount of the washing water introduced may be measured by the number of revolutions of the impeller 120. Therefore, it is common to set the water supply time by measuring the time taken for the impeller 120 to rotate to the target rotational speed at the appropriate water pressure.

However, when the amount of water supplied is controlled by a predetermined time as described above, there may be a difference in the amount of water supplied as the internal conditions change due to the transportation and long-term use of the dishwasher.

In particular, depending on the installation state of the rotating shaft of the impeller 120 may be rotated at a different speed even at the same water pressure. For example, when slightly shifted to the rotation axis of the impeller 120 due to a collision during transportation may occur when rotating at a lower number of revolutions per unit time than the original water supply, on the contrary may also occur when rotating faster than the original .

In this case, during the preset water supply time, the impeller 120 may rotate with an excess rotation speed or less than the rotation speed in comparison with the target rotation speed, thereby causing a difference with the target water supply. In particular, when the impeller 120 does not reach the target rotational speed per water supply time, since the washing water is supplied less than the standard, it is difficult to expect an effective cleaning.

Therefore, in the present invention, it is preferable to grasp and correct the water supply correction amount for correcting the error of the water supply amount different from the installation state of the impeller 120 as described above.

That is, it is preferable to measure the rotational speed of the impeller 120 at the time of water supply, determine the amount of water supplied when the impeller 120 rotates at the measured rotational speed for a preset water supply time, and measure and correct the water supply correction amount. Do.

In the present embodiment, in order to measure the rotational speed 120 of the impeller, the time taken for the impeller 120 to rotate by the reference speed during water supply is measured and compared with the previously stored reference time of the impeller 120. The speed of rotation can be detected.

Here, the reference speed and the reference time mean a value measured to compare the rotation speed of the impeller 120. For example, if 12 seconds was taken while the impeller 120 rotated 100 times in the normal water pressure state (3.2kgf / cm ³ ) when calculating the water supply time for the proper amount of washing water, the impeller 120 rotated 100 times in actual use. By measuring the time taken, the rotational speed of the impeller 120 can be compared. In this case, the rotation speed of the impeller 120 is referred to as the reference rotation speed, and the 12 seconds are regarded as the reference time.

 However, the method of measuring the rotational speed of the impeller 120 used in the present embodiment is one example and the present invention is not limited thereto. Therefore, it is of course also possible to measure the rotational speed of the impeller 120 through another method.

Referring to FIG. 3, a water supply control method of the dish washing machine according to the present embodiment will be described in detail.

First, a time T ₀ during which water is supplied into the dishwasher may be set (S1). The time T ₀ at which the water supply proceeds is preferably set based on the amount of washing water required according to the amount or state of the dishes. As described above, it is common to display the remaining operation time of the dishwasher to the user. Thus, it is preferable to control the amount of the washing water supplied using the water supply time.

The setting of the water supply time may be directly input by the user, or may be set based on contents stored in the memory according to the contents of the washing.

When the water supply time T ₀ is set, water may be connected to the external water source and start water supply to the dish washing water (S2). In this step, the washing water is introduced from the external water supply source and is received in the sump 9 by passing through the impeller 120 formed in the water supply passage.

On the other hand, in the present embodiment, the amount of washing water is controlled using the water supply time, and it is preferable to calculate the water supply running time t at the same time as the start of the water supply.

As such, as the water supply starts and the washing water passes through the water supply passage, the impeller 120 is rotated. The impeller 120 may be rotated by the hydraulic pressure of the external monastery to be supplied, or the rotational speed may vary depending on the state in which the impeller 120 is installed.

When the water supply is started and the rotation of the impeller 120 starts, the step of determining the rotational speed of the impeller 120 to determine the installation state of the impeller 120 and the like.

As described above, in the present embodiment, detecting the rotation speed of the impeller 120 in a water supply state to determine the rotation speed of the impeller 120; It may include the step of measuring the time the impeller 120 rotates by a reference speed.

Therefore, when the water supply is started, it is preferable to perform the step of measuring the number of revolutions (H) of the impeller 120 (S3). Here, since the required amount of water may be small according to the process of dish washing, it is more preferable to perform the step of measuring the rotational speed H of the impeller 120 at the same time as the start of the water supply.

As such, when measuring the rotational speed of the impeller 120 at the same time as the start of water supply, the time t _x that the impeller 120 reaches to the reference rotational speed is the water supply running time t calculated at the same time as the start of the water supply. Can be measured.

However, unlike the present embodiment, it is also possible to measure the rotational speed of the impeller 120 after a predetermined time elapses from the start of water supply. In this case, the time t _{x for} the impeller 120 to reach the reference rotational speed should be calculated separately from the water supply running time t.

Thereafter, a step of continuously determining whether the measured rotation speed H reaches the reference rotation speed is performed (S4).

FIG. 3 assumes that the reference rotational speed is 100. When it is determined that the measured rotational speed H does not reach the reference rotational speed 100, it is preferable to continuously measure the rotational speed H. .

However, if it is determined that the reference speed has been reached, the measurement of the rotation speed of the impeller 120 is ended, and the water supply progress time t at this point is stored as the time t _x at which the reference speed is reached. It is preferable to carry out (S5).

Here, the time (t _x ) for the impeller 120 to rotate by the reference speed is passed through the impeller 120 for the preset water supply time using the reference time (T _x ) to flow into the sump (9). The amount of wash water can be determined (S6).

For example, when the reference time T _x is stored as 12 seconds, when the time taken for the impeller 120 to rotate by the reference speed is 12 seconds, it is determined that the amount of washing water actually supplied is equal to the amount of proper washing water. can do.

On the other hand, when the time taken for the impeller 120 to rotate by the reference speed is measured to 14 seconds, it can be determined that the amount of wash water actually supplied is less than the appropriate amount of wash water. Because the impeller 120 rotates slowly by a ratio of 12/14 relative to the reference rotational speed, the impeller 120 rotates at a lesser number of revolutions for the predetermined time, and thus the amount of water to be supplied is also increased by the ratio. Because it decreases.

On the other hand, when the time taken for the impeller 120 to rotate by the reference speed is measured to 10 seconds, it can be determined that the amount of washing water actually supplied is greater than the appropriate amount of washing water. This is because the rotational speed of the impeller 120 is faster than the reference rotational speed, and thus, the amount of the washing water supplied while the impeller 120 rotates a lot of rotations for a predetermined time increases.

Therefore, in the present embodiment, it is possible to determine the amount of washing water expected during the predetermined water supply time through the above-described steps, and to calculate the water supply correction amount by comparing this with the amount of the appropriate washing water.

Afterwards, it is preferable to perform the step of correcting the water supply amount by the calculated water supply correction amount.

Correcting the water supply amount may be made to drain the washing water by a predetermined amount of water supply correction amount when it is determined that the proper washing water amount is exceeded, and additionally supply water by the water supply correction amount when it is determined that the water supply correction amount is not reached. have.

However, in the present embodiment, it is possible to control to correct the water supply only when it is expected to fall below the appropriate amount of washing water. If excess water is produced, there is no big problem in the washing efficiency, whereas if the washing water is insufficient, there is a concern that the cleaning effect is significantly lowered due to problems such as pressure of water sprayed during washing and contamination of water.

Therefore, in the present embodiment, as shown in FIG. 3, when the time t _{x for} the impeller 120 to rotate by the reference speed is less than the reference time T _x , a step of correcting the water supply amount is performed. Without performing, it is preferable to perform the step of correcting the water supply amount only when the time (t _x ) for the impeller 120 to rotate by the reference speed exceeds the reference time (T _x ).

Therefore, when it is determined that the time t _x that the impeller 120 takes to rotate by the reference speed is less than the reference time T _x , the amount of the washing water to be supplied is not a problem. After the watering can be finished the watering step (S7).

On the other hand, if the time taken for the impeller 120 to rotate by the reference speed (t _x ) exceeds the reference time (T _x ), calculating the amount of correction to compensate for the insufficient water and the amount of correction Perform additional watering steps.

In the calculating of the correction quantity, the correction quantity may be calculated based on a ratio of the time t _x and the reference time T _x that the impeller 120 rotates by the reference speed (S8). Here, the dishwasher according to the present embodiment is the water supply amount is controlled by the water supply time, it is preferable that the correction amount to calculate the water supply time to proceed further by using the ratio.

Using the above ratio, the water supply time t _{o that} needs to be further performed with respect to the water supply time T _o set in advance may be obtained by the following equation.

However, it is preferable that the additional water supply by the correction water is additionally supplied after the preset water supply time ends. Therefore, it is preferable to determine whether the water supply time t has reached the predetermined water supply time T _o , and when the predetermined water supply time is over, proceed with the additional water supply time to correct the amount of washing water and end the water supply. (S9)

Therefore, according to this embodiment, even if an abnormality occurs in the installation state of the impeller 120 due to transportation or long-term use, it is possible to control the washing to proceed smoothly by correcting the amount of the water to be supplied to an appropriate level. .

However, in the washing operation of the dishwasher, it may be controlled including a plurality of water supply cycles even during one operation.

In this case, as described above, the step of calculating the corrected amount of washing water and the step of correcting the water supply amount may be performed in the same manner for each of the plurality of water supply cycles.

However, since the installation state of the impeller 120 or the like does not change much during the same operation, the water supply correction quantity is calculated only in the first water supply cycle among a plurality of water supply cycles. It is more preferable to control to correct the water supply time by each.

1 is a longitudinal sectional view schematically showing a conventional dishwasher,

2 is a schematic view showing the structure of an air brake assembly;

3 is a flow chart illustrating a control method of a dish washer according to an embodiment of the present invention.

Claims (12)

In a dishwasher controlled to supply water for a set time, In order to overcome the error of the water supply amount according to the installation state of the impeller installed in the water supply passage, the control method of the dishwasher to determine the water supply correction amount by comparing the time it takes for the impeller to rotate by the reference rotation speed when water supply . The method according to claim 1, Measuring the number of revolutions of the impeller installed in the water supply passage during water supply; Measuring a time at which the impeller rotates by a reference speed; And, And calculating a water supply correction amount by comparing the measured time with a preset reference time. 3. The method of claim 2, The method of claim 1, further comprising correcting the water supply amount based on the calculated water supply correction amount. The method of claim 3, And correcting the water supply amount after the water supply is performed for the set time. 5. The method of claim 4, And correcting the water supply amount only when the measured time exceeds the reference time. The method of claim 5, The correcting of the water supply amount is a control method of the dishwasher, characterized in that the additional water supply for the time corresponding to the water supply correction amount. 3. The method of claim 2, And when the measured time is less than or equal to the reference time, after the water is supplied for the set time, ending the water supply. The method according to claim 2 or 4, Measuring the number of revolutions of the impeller control method of the dishwasher, characterized in that at the same time the water supply is started In the control method of the dishwasher comprising a plurality of water supply cycles, At least one water supply stage Calculating a water supply correction amount by comparing a time taken for the impeller installed in the water supply passage to rotate by the reference rotational speed with a preset reference time; And, Correcting the water supply amount by correcting the water supply time set by the calculated water supply correction amount. 10. The method of claim 9, Each of the plurality of water supply cycles includes calculating the water supply correction amount and correcting the water supply amount. 10. The method of claim 9, Calculating the water supply correction amount only in the first water supply cycle of the plurality of water supply cycles, In the subsequent water supply cycle, the control method of the dish washer, characterized in that for correcting the water supply time according to the calculated water supply correction amount. In a dishwasher controlled to supply water for a set time, In order to overcome the error of the water supply amount according to the installation state of the impeller installed in the water supply flow path, the control method of the dishwasher to determine the water supply after measuring the speed of the impeller to determine the amount of water flowing in a predetermined reference time.

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