CN112168100B - Dishwasher water inlet control method and dishwasher - Google Patents

Abstract

The invention discloses a dishwasher water inlet control method and a dishwasher, wherein the method comprises the following steps of S1, starting a water inlet program; s2, starting water inflow, and starting timing when a first inflection point appears in the water level frequency signal; and S3, judging whether a second inflection point appears on the water level frequency signal, if so, ending the timing, and calculating the water inflow in unit time according to the second inflection point, if not, continuing water inflow. The dishwasher is used for implementing the dishwasher water inlet control method. The invention utilizes the small volume of the water containing chamber relative to the volume of the dish washer, and has higher detection precision in the water inlet process, so as to obtain the water inlet amount in unit time, further control the water inlet process of the dish washer and improve the water inlet precision of the dish washer.

Description

Dishwasher water inlet control method and dishwasher

Technical Field

The present invention belongs to the technical field of household appliances, and in particular, relates to a dishwasher water inlet control method and a dishwasher.

Background technique

As the pace of modern life accelerates, dishwashers are becoming more and more popular among consumers. Since the residences of dishwasher users are different, the water pressure of daily water use cannot be consistent. For example, the difference in waterway design between old and new buildings, the height of floors or buildings in different areas will cause changes in water supply pressure; even if the residential conditions are the same, the number of water points will also cause changes in water pressure.

In order to solve this problem, dishwashers in the prior art often add a flow meter in the water gate to determine the water supply flow rate, and record the corresponding water intake according to the number of rotations of the flow meter impeller. When the number of rotations reaches a preset value, the dishwasher will close the water inlet valve to stop water intake.

However, when the water supply pressure is insufficient, the impeller of the flow meter can still rotate, so the dishwasher using the flow meter cannot accurately reflect the water intake. Affected by this, when the water pressure is low, a longer water intake time is required to achieve the standard washing time, making the actual running time of the dishwasher inconsistent with the standard time displayed on the panel, affecting the user experience.

In view of this, the present invention is proposed.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a dishwasher water inlet control method with improved water inlet accuracy.

Another object of the present invention is to provide a dishwasher for implementing the dishwasher water inlet control method.

In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

A method for controlling water inlet of a dishwasher,

The method comprises the following steps,

S1, water inlet program starts running;

S2, water inflow starts, when the first inflection point of the water level frequency signal is detected, the timing starts;

S3, judging whether the water level frequency signal has a second inflection point, if so, ending the timing and calculating the water intake per unit time accordingly, if not, continuing to intake water.

In the above scheme, the volume of the water holding chamber is relatively small compared to the volume of the dishwasher, and the water inlet process detection accuracy is high, so the water inlet volume per unit time is obtained, and then the water inlet process of the dishwasher is controlled, thereby improving the water inlet accuracy of the dishwasher.

further,

The water level frequency signal is detected in real time by a pressure sensor.

further,

In step S2, it also includes:

The first inflection point is a water level frequency signal when the pressure sensor detects initial water level pressure information in the dishwasher.

further,

In step S3, it also includes:

The second inflection point is a water level frequency signal when the water level pressure information of the cross-sectional area of the dishwasher detected by the pressure sensor suddenly changes in the direction of water level rise.

In the above scheme, by detecting the change of the water level frequency signal to determine the nodes where water inflow starts and ends in the water storage chamber, the amount of water inflow per unit time and the duration of the water inflow process can be more accurately calculated.

further,

The water inflow between the first inflection point and the second inflection point is a fixed value and is stored in the water inflow program of the dishwasher.

In the above scheme, the volume of the water chamber is a fixed value, and the water intake per unit time is obtained, thereby controlling the water intake process of the dishwasher and improving the water intake accuracy of the dishwasher.

further,

Before water is added, the following operations need to be performed: Set the total amount of water added.

In the above solution, the user can set the required total water intake amount according to the selection to improve the user experience.

further,

S4, calculating the remaining water inflow time according to the total water inflow amount and the water inflow amount per unit time, and controlling the dishwasher to inflow water according to the remaining water inflow time;

S5, judging whether the remaining water inlet time has been reached, if so, ending the water inlet, and executing the next program according to the program setting, that is, executing the remaining stages of the washing program, if not, continuing the water inlet.

In the above scheme, the water inlet measurement accuracy is improved without increasing the hardware cost.

further,

Step S2 also includes:

Before water inflow begins, check whether the water level frequency signal is at the set maximum value. If so, start water inflow. If not, execute the drainage procedure. Repeat this cycle until the set maximum value of the water level frequency signal is detected.

In the above scheme, whether there is residual washing water is determined before water intake begins, thereby determining whether to start the drainage program, thereby further improving the detection accuracy.

A dishwasher is used to implement the above dishwasher water inlet control method.

further,

The dishwasher includes a water holding chamber, and the pressure sensor is disposed at the bottom of the water holding chamber.

In the above scheme, the dishwasher water inlet control method of the present invention makes judgments by detecting changes in the water level frequency signal converted by the pressure sensor, replacing the water pressure value detected by the direct sampling pressure sensor in the prior art, and has higher detection accuracy.

After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

1. The dishwasher water inlet control method of the present invention utilizes the fact that the volume of the water storage chamber is relatively small compared to the volume of the dishwasher, and the water inlet process detection accuracy is high, so as to obtain the water inlet volume per unit time, thereby controlling the dishwasher water inlet process and improving the dishwasher water inlet accuracy;

2. The dishwasher water inlet control method of the present invention determines the start and end points of water inlet into the water chamber by detecting the change of the water level frequency signal, and can more accurately calculate the water inlet volume per unit time and the water inlet time required for the water inlet process;

3. The dishwasher water inlet control method of the present invention makes judgments by detecting changes in the water level frequency signal converted by the pressure sensor, replacing the water pressure value detected by the direct sampling pressure sensor in the prior art, and has higher detection accuracy.

The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

FIG1 is a flow chart of a method for controlling water inlet of a dishwasher according to the present invention;

Fig. 2 is a schematic diagram of the change of the water level frequency signal curve (f-t) of the present invention;

FIG3 is another flow chart of a method for controlling water inlet of a dishwasher according to the present invention;

FIG4 is a schematic diagram of a water inlet control device for a dishwasher according to the present invention;

FIG. 5 is a block diagram of a dishwasher according to the present invention.

In the figure: 1, dishwasher; 10, dishwasher water inlet control device; 101, water inlet module; 102, water level detection module; 103, timing module; 104, control module;

f, water level frequency signal; t, time; A, first inflection point; B, second inflection point.

It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

As shown in FIGS. 1 to 5 , the dishwasher water inlet control method provided by the present invention comprises the following steps:

S1, water inlet program starts running;

S2, water inflow starts, when the first inflection point A of the water level frequency signal f is detected, the timing starts;

S3, judging whether the water level frequency signal f has a second inflection point B, if so, ending the timing and calculating the water intake per unit time accordingly, if not, continuing to intake water.

The dishwasher water inlet control method of the present invention utilizes the fact that the volume of the water holding chamber is relatively small relative to the volume of the dishwasher 1, and the change accuracy of the water level frequency signal f detected during the water inlet process is high. The nodes where the water inlet in the water holding chamber starts and ends are determined, and the water inlet volume per unit time is obtained, thereby controlling the water inlet process of the dishwasher 1 and improving the water inlet accuracy of the dishwasher 1.

Embodiment 1

As shown in FIG. 1 and FIG. 2 , the dishwasher water inlet control method provided in this embodiment includes the following steps:

S1, water inlet program starts running;

S2, water inflow starts, when the first inflection point A of the water level frequency signal f is detected, the timing starts;

S3, judging whether the water level frequency signal f has a second inflection point B, if so, ending the timing and calculating the water intake per unit time accordingly, if not, continuing to intake water.

Specifically, the dishwasher 1 includes a water storage chamber, in which a water storage chamber with an open top is defined. Preferably, the dishwasher 1 may include an inner tank, which forms a washing chamber, in which a shelf is arranged, and dishes, utensils and other tableware can be placed on the shelf for washing. A water storage chamber is arranged below the inner tank, and the volume of the water storage chamber is relatively small compared to the inner tank. Washing water or rinsing water is collected in the water storage chamber after entering the inner tank. The washing water or rinsing water can be pumped out from the water storage chamber by a pump to each spraying arm installed in the inner tank, so as to spray the washing water or rinsing water on the dishes, utensils and other tableware accommodated in the shelf under pressure. Since the volume of the water storage chamber is small, the accuracy of detecting the water level frequency signal f during the water inlet process is high. In this embodiment, the water inflow per unit time of the dishwasher 1 is calculated by judging the time from the start of water inflow to the filling of the water storage chamber with washing water, that is, the time required for the water storage chamber to quantitatively inflow water when the volume of the water storage chamber is known.

In detail, as shown in FIG2 , in the water level frequency signal f-time t (f-t) diagram, the water inlet program starts to run, and water inlet starts. When the first inflection point A of the water level frequency signal f in the water storage chamber is detected, it is considered that water inlet into the water storage chamber begins, and the dishwasher 1 is controlled to start timing, and this is time T1;

During the water inflow process of the water chamber, it is determined whether the water level frequency signal f in the water chamber has a second inflection point B. If so, it is considered that the water inflow process of the water chamber is completed, that is, the washing water fills the water chamber, and the dishwasher 1 is controlled to stop timing, which is time T2.

Based on this, the time required for the water chamber to start and end water filling can be calculated according to the following formula:

ΔT＝T2-T1

Since the volume of the water chamber of the dishwasher 1 is constant, assuming that the volume of the water chamber is Q1, the water inflow per unit time q of the water chamber can be calculated according to the following formula:

If the second inflection point B of the water level frequency signal f in the water holding chamber is not detected, water continues to be introduced until the second inflection point B of the water level frequency signal f in the water holding chamber is detected.

Furthermore, this embodiment detects the water level frequency signal f in real time through a pressure sensor, and the pressure sensor is disposed in the water holding chamber. Preferably, the pressure sensor is disposed at the bottom of the water holding chamber, and the detected water level frequency signal f is more accurate.

As shown in FIG1 and FIG2, when water inlet does not start, the pressure sensor does not detect pressure information, and the converted water level frequency signal f is the maximum water level frequency. After water inlet starts, the washing water of some models of dishwashers 1 does not enter the water storage chamber immediately, but passes through a distance in the inner tank of the dishwasher 1. Therefore, before the washing water enters the water storage chamber, the water level frequency signal f detected by the dishwasher 1 maintains the maximum water level frequency and lasts for a period of time. After the washing water enters the water storage chamber, the pressure sensor detects pressure information, and the converted water level frequency signal f begins to decrease. This is the first inflection point A of the water level frequency signal f. When the dishwasher 1 detects the first inflection point A, timing starts, and this is time T1.

As the washing water continues to enter the water holding chamber, the water level frequency signal f drops rapidly, and the changing curve of the water level frequency signal f shows a linear downward trend. When the water holding chamber reaches the maximum volume of the water holding chamber, the decrease of the water level frequency signal f converted by the pressure sensor begins to slow down, and the downward trend of the changing curve of the water level frequency signal f gradually slows down. This is the second inflection point B of the water level frequency signal f, and the dishwasher 1 is controlled to end timing, which is time T2.

Preferably, the maximum water storage capacity of the water holding chamber is stored in the water inlet program of the dishwasher 1. When the dishwasher 1 determines the start and end nodes of the water inlet into the water holding chamber, the water inlet time ΔT required for the water holding chamber to be filled with washing water is calculated accordingly. The water inlet capacity per unit time q of the water holding chamber is calculated according to the following formula based on the maximum water storage capacity of the water holding chamber stored in the water inlet program of the dishwasher 1, that is, the volume of the water holding chamber:

Embodiment 2

The dishwasher water inlet control method provided in this embodiment is a supplement to the first embodiment.

As shown in FIG. 1 , a method for controlling water inlet of a dishwasher further includes the following operations before water inlet: setting the total amount of water inlet,

S4, calculating the remaining water inflow time according to the total amount of water inflow and the water inflow per unit time, and controlling the dishwasher 1 to inflow water according to the remaining water inflow time;

S5, judging whether the remaining water inlet time has been reached, if so, ending the water inlet, and executing the next program according to the program setting, that is, executing the remaining stages of the washing program, if not, continuing the water inlet.

In detail, the water inlet program starts to run, and water inlet starts. When the first inflection point A of the water level frequency signal f in the water storage chamber is detected, it is considered that water starts to enter the water storage chamber, and the dishwasher 1 is controlled to start timing, which is time T1;

During the water inflow process of the water chamber, it is determined whether the water level frequency signal f in the water chamber has a second inflection point B. If so, it is considered that the water inflow process of the water chamber is completed, that is, the washing water fills the water chamber, and the dishwasher 1 is controlled to stop timing, which is time T2.

Based on this, the time required for the water chamber to start and end water filling can be calculated according to the following formula:

ΔT＝T2-T1

Since the volume of the water chamber in the dishwasher 1 is constant, assuming that the volume of the water chamber is Q1, the water inflow per unit time q of the water chamber can be calculated according to the following formula:

If the second inflection point B of the water level frequency signal f in the water holding chamber is not detected, water continues to be introduced until the second inflection point B of the water level frequency signal f in the water holding chamber is detected.

Assuming that the total amount of water inflow set by the user or the total amount of water inflow in the washing program set in the dishwasher 1 is Q2, the water inflow exceeding the volume of the water storage chamber is increased due to the enlargement of the inner tank cavity of the dishwasher 1, resulting in a decrease in the accuracy of the water level frequency signal f detected by the pressure sensor. The method of determining the sampling value of the pressure sensor cannot be used to directly determine the water inflow. Therefore, the total water inflow time T3 required for water inflow to the total amount of water inflow can be calculated based on the water inflow per unit time obtained using the following formula:

Based on this, the remaining water inflow time T4 can be obtained:

T4＝T3-ΔT

The dishwasher 1 is controlled to continue to fill with water, and the timing is started to determine whether the remaining water filling time reaches the required remaining water filling time T4. If so, the water filling is terminated, and the next program is executed according to the program setting, that is, the remaining stage of the washing program is executed. If not, the water filling continues until the required remaining water filling time T4 is reached. At this time, the total amount of water filling is the target total amount of water filling set by the end user or the target total amount of water filling preset by the washing program.

Embodiment 3

The difference between this embodiment and the second embodiment is that:

In this embodiment, it is assumed that the total amount of water inflow set by the user or the total amount of water inflow in the washing program set in the dishwasher 1 is Q2. The water inflow exceeding the volume of the water storage chamber is increased due to the enlargement of the inner tank cavity of the dishwasher 1, resulting in a decrease in the accuracy of the water level frequency signal f detected by the pressure sensor. The method of determining the sampling value of the pressure sensor cannot be used to directly determine the water inflow. Therefore, the required remaining water inflow Q3 can be calculated based on the maximum water storage capacity of the water storage chamber stored in the washing program of the dishwasher 1, that is, the volume of the water storage chamber:

Q3＝Q2-Q1

Then, based on the water inflow per unit time, the remaining water inflow time T4 required to reach the required remaining water inflow Q3 is calculated using the following formula:

The dishwasher 1 is controlled to continue to fill with water, and the timing is started to determine whether the remaining water filling time reaches the required remaining water filling time T4. If so, the water filling is terminated, and the next program is executed according to the program setting, that is, the remaining stage of the washing program is executed. If not, the water filling continues until the required remaining water filling time T4 is reached. At this time, the total amount of water filling is the target total amount of water filling set by the end user or the target total amount of water filling preset by the washing program.

Embodiment 4

The present embodiment provides a method for controlling water inlet of a dishwasher 1, which is based on the first embodiment, the second embodiment or the third embodiment, and adds the following steps in step S2:

As shown in Figure 3, step S2 also includes step S20, which detects the water level frequency signal f before water inlet begins to flow in, and determines whether the water level frequency signal f is at a set maximum value at this time. If so, water inlet begins; if not, the drainage procedure is executed. After drainage is completed, the water level frequency signal f continues to be detected, and this cycle is repeated until the set maximum value of the water level frequency signal f is detected.

This is because the volume of the water chamber is relatively small and the detection accuracy is high. Therefore, in actual applications, if there is a drainage failure after the last washing process, resulting in undrained water stored in the water chamber, or the last drainage stage of the last washing process was accidentally terminated, resulting in a small amount of water remaining, then the dishwasher 1 will judge the water filling time of the water chamber in error, and there will be errors in calculating the water intake per unit time based on the maximum volume of the water chamber. These will affect the water intake accuracy of the dishwasher 1 this time, resulting in insufficient water intake and affecting the washing effect.

Specifically, due to the influence of detection accuracy and environmental factors, the maximum value of the water level frequency signal f is not a specific value, but an interval value. As long as the detected water level frequency signal f is within this interval, it can be considered that the detected water level frequency signal f is at its maximum value.

Embodiment 5

This embodiment provides a dishwasher water inlet control device 10, which is used to implement but not limited to the dishwasher water inlet control method of any one of the first to fourth embodiments. As shown in FIG. 4 , the device includes:

A water inlet module 101, used for supplying washing water into the dishwasher 1;

A water level detection module 102, which is used to detect the water level frequency signal f in the dishwasher 1 in real time during the water intake process;

A timing module 103, the timing module 103 is used to time the water inlet time during the water inlet process;

The control module 104 is connected to the water inlet module 101, the water level detection module 102 and the timing module 103 respectively. The control module 104 is used to control the water inlet module 101 to be in a working state when the dishwasher 1 executes the water inlet program, start timing when it is determined that the water level frequency signal f has a first inflection point A, and end timing when it is determined that the water level frequency signal f has a second inflection point B, calculate the water inlet volume per unit time based on this, calculate the remaining water inlet time based on the total water inlet volume and the water inlet volume per unit time, control the water inlet module 101 to inlet water according to the remaining water inlet time, and when it is determined that the remaining water inlet time is reached, control the water inlet module 101 to end water inlet, and execute the next program according to the program setting, that is, execute the remaining stage of the washing program.

Preferably, the water level detection module 102 includes a pressure sensor, and the pressure sensor is arranged at the bottom of the water holding chamber.

When water inflow has not started, the pressure sensor does not detect pressure information, and the converted water level frequency signal f is the maximum water level frequency. After water inflow starts, the pressure sensor detects pressure information, and the converted water level frequency signal f begins to decrease. This is the first inflection point A of the water level frequency signal f.

As the water inflow increases, the water level frequency signal f drops rapidly. When the water storage chamber reaches the maximum water storage capacity, the decrease of the water level frequency signal f converted by the pressure sensor begins to slow down. This is the second inflection point B of the water level frequency signal f.

Embodiment 6

As shown in FIG. 5 , this embodiment provides a dishwasher 1 , which includes the dishwasher water inlet control device 10 of the fifth embodiment and also includes a drainage module.

The dishwasher 1 is used to implement the above-mentioned dishwasher water inlet control method.

The dishwasher 1 includes a water storage chamber, and a pressure sensor is disposed at the bottom of the water storage chamber.

The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims (7)

1. A water inflow control method of a dish washer is characterized in that:

the method comprises the steps of,

S1, starting a water inlet program;

s2, starting water inflow, and starting timing when a first inflection point appears in the water level frequency signal, wherein the first inflection point is the water level frequency signal of the initial water level pressure information in the dish washer detected by the pressure sensor;

S3, judging whether a second inflection point appears in the water level frequency signal, if so, ending timing, and calculating the water inflow amount in unit time according to the second inflection point, if not, continuing water inflow, wherein the second inflection point is the water level frequency signal detected by the pressure sensor when the cross section area of the dish washer is in water level pressure information at the abrupt change position of the water level rising direction.

2. The dishwasher water inlet control method of claim 1, wherein:

and the water inflow between the first inflection point and the second inflection point is a fixed value and is stored in a water inflow program of the dish washer.

3. The dishwasher water inlet control method of claim 1, wherein:

before water is fed, the following operations are also required: setting the total amount of water inflow.

4. A dishwasher water inlet control method as in claim 3, wherein: the method may further comprise the steps of,

S4, calculating the residual water inlet time according to the total water inlet amount and the water inlet amount in unit time, and controlling the dish-washing machine to inlet water according to the residual water inlet time;

S5, judging whether the residual water inlet time is reached, if so, ending water inlet, executing the next program according to program setting, namely executing the residual stage of the washing program, and if not, continuing water inlet.

5. The dishwasher water inlet control method according to any one of claims 1 to 4, characterized in that:

The step S2 also includes the step of,

Before water inflow is started, whether the water level frequency signal is at a set maximum value is detected, if so, water inflow is started, if not, a water discharging program is executed, and the process is circulated until the set maximum value of the water level frequency signal is detected.

6. A dishwasher for implementing a dishwasher water inlet control method according to any one of claims 1 to 5.

7. The dishwasher of claim 6, characterized in that:

The dishwasher comprises a water containing chamber, and the pressure sensor is arranged at the bottom of the water containing chamber.