CN114129073B - Water shortage detection method for food processing machine and food processing machine - Google Patents

Abstract

The embodiment of the invention discloses a water shortage detection method of a food processor and the food processor, and the method comprises the steps of detecting a resistance value between two electrodes and comparing the resistance value with a resistance threshold value; when the resistance value is smaller than or equal to the resistance threshold value, determining the current operation function of the food processor, wherein the operation function comprises a hot state function of heating the steam generator and a cold state function of not heating the steam generator, or the operation function comprises full-speed operation or non-full-speed operation of the water pump; determining a judging parameter according to the current running function, and secondarily judging whether the water tank is water or not according to the judging parameter. The water shortage detection method of the food processor and the food processor disclosed by the embodiment of the invention can improve the reliability of anhydrous detection.

Description

Water shortage detection method for food processing machine and food processing machine

technical field

The invention relates to but not limited to the field of kitchen appliances, in particular to a method for detecting water shortage of a food processor and the food processor.

Background technique

Food processors generally use heating tubes or electromagnetic heating methods to directly heat or boil the materials. If the temperature of the heating container is too high, the materials will easily stick to the wall of the container, resulting in the problem of sticky tubes, which not only affects the taste of drinks, but also troublesome for users to clean. In addition, with the multi-functionalization of food processors, a single heating method cannot meet the technological needs of multi-functional recipes.

For this reason, some food processors have appeared a heating technology using steam heating. The use of steam heating can not only solve the problem of heating paste tubes in food processors, but also meet the heating needs of cooking with different functions. Since the principle of steam heating is to use water vapor to heat materials, it is necessary to involve the design of the water inlet module and water level detection to ensure the reliability of steam heating and prevent the heating module from drying out.

Some technologies use metal electrodes for water level detection, which are less costly than using flow meters or pressure sensors for water level detection. The principle of metal electrode detection of water level is to judge whether there is water by detecting the change of resistance value between two electrodes. However, there are many kinds of water in the market, and the resistance value of each kind of water is different, especially mineral water and distilled water. Mineral water contains a lot of minerals, so the resistance of water is very small, but distilled water has a large resistance because there are basically no minerals in the water. After the user has used mineral water for a long time, due to the pollution of the pipeline, the resistance value of the electrode when there is no water will be close to the resistance value when there is water in distilled water. If only the resistance value of the electrode is used to determine whether there is water, it is judged that there is water Misjudgment phenomenon, the detection reliability is low.

Contents of the invention

In the first aspect, an embodiment of the present application provides a method for detecting water shortage of a food processor. The food processor includes a base and a processing assembly arranged on the base. The processing assembly includes a cup body, a crushing device and Cup cover, the cup body and the cup cover cooperate to form a processing chamber, a water tank, a water pump and a steam generator are also provided on the base, and two electrodes are provided on the pipeline of the water outlet of the water tank. The method include:

detecting a resistance value between the two electrodes, comparing said resistance value to a resistance threshold;

When the resistance value is less than or equal to the resistance threshold value, determine the current operating function of the food processor, and the operating function includes the hot state function of the steam generator being heated and the unheated state function of the steam generator The cold state function, or, the operation function includes the water pump working at full speed or the water pump not working at full speed;

Determination parameters are determined according to the current operating function, and the determination parameters include the steam generator, the resistance value or the water pump, and a second determination is made on whether there is water in the water tank according to the determination parameters.

In an example, when the current operating function is a thermal function, the determination parameter is the temperature of the steam generator.

In an example, the secondary determination of whether there is water in the water tank according to the determination parameters includes:

detecting the temperature of the steam generator, and comparing the temperature of the steam generator with a temperature threshold;

When the temperature of the steam generator is greater than the temperature threshold, it is determined that there is no water in the water tank.

In an example, when the current operating function is that the water pump is not working at full speed, the determination parameter is the variation trend of the resistance value.

In an example, the secondary determination of whether there is water in the water tank according to the determination parameters includes:

Detect the resistance value between two electrodes within a preset time period;

When the resistance value continues to rise within the preset time period, it is determined that there is no water in the water tank.

In an example, after the second determination that there is no water in the water tank, the method further includes:

controlling the water pump to work at full speed, and detecting the pumping current value when the water pump is working at full speed, and performing three judgments on whether there is water in the water tank according to the pumping current value;

Wherein, when the pumping current value is less than the current threshold, it is determined that there is no water in the water tank.

In an example, when the current running function is a cold function or the water pump is working at full speed, the determination parameter is the water pumping current value of the water pump.

In an example, the secondary determination of whether there is water in the water tank according to the determination parameters includes:

Detecting the pumping current value of the water pump, and comparing the pumping current value with a current threshold;

When the water pumping current value is less than the current threshold, it is determined that there is no water in the water tank.

In an example, the method also includes:

When the food processing machine enters the first preset mode, detecting the first current value when the water pump is empty at full speed, and detecting the second current value when the water pump is pumping water at full speed;

determining the current threshold according to the first current value and the second current value;

When the food processor enters the second preset mode, determining a first resistance value when the electrodes detect distilled water, and determining a second resistance value when the electrodes detect no water;

The resistance threshold is determined according to the first resistance value and the second resistance value.

In the second aspect, the embodiment of the present application provides a food processing machine, including a base and a processing assembly arranged on the base, the processing assembly includes a cup body, a crushing device and a cup cover, the cup body and the The cup cover cooperates to form a processing chamber, and the base is also provided with a water tank, a water pump and a steam generator, and two electrodes are provided on the pipeline of the water outlet of the water tank;

The food processor further includes a main control chip, and the main control chip is used to execute the method for detecting water shortage of the food processor according to any embodiment of the first aspect.

Compared with the prior art, the method for detecting water shortage of a food processing machine and the food processing machine provided by at least one embodiment of the present application have the following beneficial effects: when the electrode is used to determine whether there is water in the water tank, different modes are used for secondary determination , to avoid the misjudgment of no water as water only through the resistance value collected by the electrode, so as to improve the reliability of anhydrous detection, and there is no need to design an effective isolation structure to ensure the detection reliability of the electrode, low cost, and simple installation.

In some implementations of the embodiments of the present application, the following effects can also be achieved:

1. When the electrode detection fails and it is judged that there is no water in the water tank, the second judgment is made by detecting the temperature of the steam generator, which can effectively identify whether there is water in the water tank and improve the reliability of water-free detection.

2. When the electrode detection fails and it is judged that there is no water in the water tank, the second judgment is made by detecting the current value of the water pump, which can effectively identify whether there is water in the water tank and improve the reliability of water-free detection.

3. When the electrode detection fails and it is judged that there is no water in the water tank, the second judgment is made by detecting the change trend of the resistance value between the two electrodes within the preset time period, which can effectively identify whether there is water in the water tank and improve the efficiency of the water tank. Anhydrous detection reliability.

4. When it is judged twice that there is no water in the water tank by detecting the change trend of the temperature or resistance value of the steam generator, it can be judged three times by detecting the current value of the water pump when the water pump is working at full speed, which can effectively identify whether there is water in the water tank and improve the detection of no water reliability.

5. Through the individual pumping calibration of each food processor before leaving the factory, the resistance threshold corresponding to different food processors can be determined, which can avoid the error of accessories and ensure the reliability of detection.

In some implementations of the embodiments of the present application, the following effects can also be achieved when the thermal state function is judged for the second time:

1. Using the electrode combined with the thermal function to detect whether there is water in the water tank can avoid the misjudgment that no water is judged to be water only through the resistance value collected by the electrode, and avoid a certain hysteresis only through the temperature detection of the steam generator problems, thereby improving the reliability of anhydrous detection.

2. When the temperature of the steam generator exceeds the temperature threshold, the heating is stopped immediately, and the water pump is emptied at full speed to dissipate heat, which can prevent the temperature of the steam generator from rising continuously and cause the protection thermostat to trip.

In some implementations of the embodiments of the present application, the following effects can also be achieved when the cold state function is judged for the second time:

1. The electrode combined with the cold state function is used to detect whether there is water in the water tank, which can avoid the misjudgment that no water is judged to be water only through the resistance value collected by the electrode, and avoid the problem of certain hysteresis only through the current detection of the water pump , thereby improving the reliability of anhydrous detection.

2. In the cold state function, the water pump pumps water at full speed, and the current threshold can be determined according to the first current value when the main control chip detects that the water pump is empty at full speed when the food processor is in production, and the second current value when the water pump is pumping water at full speed. , pumping calibration can be performed on each water pump at the factory, and the current threshold corresponding to different water pumps can be determined, so as to ensure the reliability of detection

Additional features and advantages of the application will be set forth in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the application. Other advantages of the present application can be realized and obtained through the schemes described in the specification and drawings.

Description of drawings

The accompanying drawings are used to provide an understanding of the technical solution of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present application.

Fig. 1 is a schematic structural view of a self-cleaning broken wall cooking machine provided by an embodiment of the present invention;

Fig. 2 is a flowchart of a water shortage detection method for a food processor provided by an exemplary embodiment of the present invention;

Fig. 3 is a flowchart of a method for detecting water shortage of a food processing machine provided by an exemplary embodiment of the present invention;

Fig. 4 is a flowchart of a water shortage detection method for a food processor provided by an exemplary embodiment of the present invention.

Detailed ways

The application describes a number of embodiments, but the description is illustrative rather than restrictive, and it will be obvious to those of ordinary skill in the art that within the scope of the embodiments described in the application, There are many more embodiments and implementations. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Except where expressly limited, any feature or element of any embodiment may be used in combination with, or substituted for, any other feature or element of any other embodiment.

This application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The disclosed embodiments, features and elements of this application can also be combined with any conventional features or elements to form unique inventive solutions as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive solutions to form another unique inventive solution as defined by the claims. It is therefore to be understood that any of the features shown and/or discussed in this application can be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be limited except in accordance with the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

Furthermore, in describing representative embodiments, the specification may have presented a method and/or process as a particular sequence of steps. However, to the extent the method or process is not dependent on the specific order of steps described herein, the method or process should not be limited to the specific order of steps described. Other sequences of steps are also possible, as will be appreciated by those of ordinary skill in the art. Therefore, the specific order of the steps set forth in the specification should not be construed as limitations on the claims. In addition, claims for the method and/or process should not be limited to performing their steps in the order written, those skilled in the art can easily understand that these orders can be changed and still remain within the spirit and scope of the embodiments of the present application Inside.

An embodiment of the present invention provides a water shortage detection scheme for a food processing machine. When metal electrodes are used to detect the water level to determine the presence of water, different modes are used to perform secondary or tertiary determinations to improve the reliability of water-free detection.

An embodiment of the present invention provides a food processing machine, which may include a base and a processing assembly arranged on the base. The processing assembly may include a cup body, a crushing device and a cup cover. The cup body and the cup cover cooperate to form a processing chamber. The base There are also water tanks, water pumps and steam generators. Wherein, the steam generator may include a heating tube, and the heating tube is attached to the boiler to heat the boiler with steam. The water pump can be a diaphragm pump.

The food processor provided in this embodiment may, but is not limited to, include a self-cleaning broken wall cooking machine, a juice extractor and a pasta machine. The following embodiments of the present invention mainly take the food processing machine as an example of water shortage detection of a self-cleaning broken cooking machine as an example, and the realization principle of water shortage detection of other food processing machines including juicers and pasta machines and self-cleaning The realization principle of the water shortage detection of the broken wall cooking machine is the same, and this embodiment will not repeat them one by one.

Fig. 1 is a schematic structural view of the self-cleaning broken-wall cooking machine provided by the embodiment of the present invention. As shown in Fig. 1, the self-cleaning broken-wall cooking machine provided by the embodiment of the present invention may include a base and a processing Assembly, the processing assembly includes a cup body 2, a crushing device and a cup cover, the cup body 2 and the cup cover cooperate to form a processing chamber, and a water tank 1, a water pump 5 and a steam generator 3 are also arranged on the base.

As shown in FIG. 1 , a water level detection module 4 for detecting whether there is water in the water tank 1 is provided on the pipeline of the water outlet of the water tank. The water level detection module may include two electrodes. Wherein, the electrodes may be metal electrodes.

In an example, as shown in FIG. 1 , the self-cleaning broken-wall cooking machine provided by the embodiment of the present invention may further include a slurry cup 6 , a rotary valve 7 and an air inlet 8 . Wherein, T3 in FIG. 1 represents the temperature inside the cup, and T represents the outlet temperature of the output hot water or steam.

Optionally, the food processing machine may further include a main control chip, which is used to implement the water shortage detection method of the food processing machine shown in the following embodiments. Wherein, the main control chip may be a single chip microcomputer (Microcontroller Uni, MCU for short). In this embodiment, the main control chip is connected with the water level detection module and the water pump respectively. Specifically, the water level detection module can be connected with the signal acquisition pin of the MCU, and the water pump can be connected with the control pin of the MCU.

Further, based on the food processing machine provided in the above embodiments, the embodiment of the present invention also provides a method for detecting water shortage of the food processing machine. Fig. 2 is a flow chart of the water shortage detection method of the food processing machine provided by an exemplary embodiment of the present invention. As shown in Fig. control chip, its specific steps may include:

S201: Detect the resistance value between the two electrodes, and compare the resistance value with a resistance threshold.

In this embodiment, whether there is water in the water tank can be detected through the two electrodes on the pipeline of the water outlet of the water tank, and the resistance value of the water in the water tank can be detected through the two electrodes to determine whether there is water in the water tank. Wherein, the implementation principle of using electrodes (such as two metal electrodes) to detect whether there is water in the water tank is the same as that of the prior art, and will not be limited or repeated in this embodiment.

S202: When the resistance value is less than or equal to the resistance threshold, determine the current operating function of the food processor.

Wherein, the running function may include a hot state function in which the steam generator is heating and a cold state function in which the steam generator is not heated, or the running function may include the water pump working at full speed or the water pump not working at full speed.

In some practical technologies, when the two electrodes detect that the resistance value of the water in the water tank is less than or equal to the resistance threshold, it is directly determined that there is water in the water tank. And because the resistance values of various waters are different, especially mineral water and distilled water, the resistance value of water is very small due to the mineral content in mineral water, but the resistance value of water is very large because there are basically no minerals in distilled water. After the user has used mineral water for a long time, due to the pollution of the pipeline, the resistance value of the electrode when there is no water will be close to the resistance value when there is water in distilled water. If only the resistance value of the electrode is used to determine whether there is water, it is judged that there is water Misjudgment phenomenon, the detection reliability is low.

In this embodiment, when the resistance value is less than or equal to the resistance threshold value, a second judgment needs to be performed in different modes to improve the reliability of water-free detection.

S203: Determine the judgment parameter according to the current operation function, and make a second judgment on whether there is water in the water tank according to the judgment parameter.

In this embodiment, the reliability of anhydrous detection is ensured by performing secondary detection on the cold state function and the hot state function, or by performing secondary detection on the water pump working at full speed and the water pump not working at full speed. In the second judgment, the judgment parameters for the second judgment can be determined according to whether the current operation function of the food processor is a hot state function or a cold state function, or whether the current operation function is the water pump working at full speed or not at full speed. The judgment parameters are used to make a second judgment on whether there is water in the water tank to improve the reliability of water-free detection.

In an example, when the current running function includes a thermal function in which the steam generator is heating, the steam generator may be used to make a second determination on whether there is water in the water tank under the thermal function.

In an example, when the current running function includes a cold function where the steam generator is not heated, a water pumping module (such as a water pump) may be used to make a second determination on whether there is water in the water tank under the cold function.

In an example, when the current operating function is that the water pump is working at full speed, a second determination may be made on whether there is water in the water tank when the water pump is working at full speed through a water pumping module (such as a water pump).

In an example, when the current operating function is that the water pump is not working at full speed, a second determination can be made whether there is water in the water tank when the water pump is not working at full speed through the change of the resistance value between the two electrodes.

The water shortage detection method of the food processing machine provided by the embodiment of the present invention, when the electrode is used to determine whether there is water in the water tank, the secondary determination is made in different modes, so as to avoid the mistake of determining that there is no water as there is water only by the resistance value collected by the electrode. Judgment phenomenon, to improve the reliability of anhydrous detection, and there is no need to design an effective isolation structure to ensure the detection reliability of the electrode, low cost, and simple installation.

In an exemplary embodiment of the present invention, when the current operating function is a thermal function, the determination parameter is the temperature of the steam generator.

In this embodiment, when the electrode determines that there is water in the water tank, the temperature of the steam generator is used to make a second judgment on whether there is water in the water tank under the thermal function, so as to improve the reliability of water-free detection.

In an example, the secondary determination of whether there is water in the water tank according to the determination parameters may include:

The temperature of the steam generator is detected, and the temperature of the steam generator is compared with the temperature threshold; when the temperature of the steam generator is greater than the temperature threshold, it is determined that there is no water in the water tank.

In practical applications, when the thermal function steam generator is working, if there is no water in the water tank, the temperature of the steam generator will rise rapidly. This embodiment can effectively identify whether there is water in the water tank by detecting the temperature of the steam generator.

In this embodiment, when the user uses the thermal function, the main control chip controls the normal operation of the steam generator and the water pump, and detects the temperature T of the steam generator at the same time. If the temperature T of the steam generator > the temperature threshold B, it is determined that there is no water in the water tank. Remind the user to add water; if the steam generator temperature T ≤ temperature threshold B, it is determined that there is water in the water tank and continue to work.

Wherein, the temperature threshold may be determined according to an empirical value or a simulated value, which is not limited and described in detail in this embodiment.

In this embodiment, the electrode combined with the thermal function is used to detect whether there is water in the water tank, which can avoid the misjudgment that no water is judged to be water only through the resistance value collected by the electrode, and avoid the presence of water only through the temperature detection of the steam generator. There is a certain hysteresis problem, thereby improving the reliability of anhydrous detection.

In one example, after determining that there is no water in the water tank through the temperature of the steam generator for the second time, it may also include:

Control the steam generator to stop heating, and control the full-speed air pumping of the water pump, which is used for heat dissipation to reduce the temperature of the steam generator.

In this embodiment, in the hot state function, the pumping speed of the water pump and the power of the steam generator can be determined according to the temperature T of the steam generator.

When the steam generator temperature T<temperature threshold B, the water pump works at low speed to ensure reliable steam generation. The power of the steam generator can be adjusted according to the temperature of the steam outlet to ensure a stable steam temperature.

When the steam generator temperature T ≥ temperature threshold B, the water pump works at full speed and the steam generator stops heating. In this embodiment, when the temperature of the steam generator exceeds the temperature threshold B, the heating is stopped immediately, and the water pump is evacuated at full speed to dissipate heat, which can prevent the temperature of the steam generator from continuing to rise and cause the protection thermostat to trip.

When the user selects the hot state function, in order to ensure that the pipeline generates steam normally, the water pump cannot work at full speed, so it is impossible to determine whether there is water in the water tank by detecting the water pump current.

In the water shortage detection method of the food processing machine provided by the embodiment of the present invention, when the electrode detection fails and the water tank is determined to have water, the temperature will rise sharply due to the normal operation of the steam generator, and it is normal when the steam generator has water. working temperature limit. In this embodiment, by detecting the temperature of the steam generator for a second judgment, it is possible to effectively identify whether there is water in the water tank, and improve the reliability of water-free detection.

In an exemplary embodiment of the present invention, when the current operating function is that the water pump is not working at full speed, the determination parameter is the variation trend of the resistance value.

In this embodiment, when the electrodes determine that there is water in the water tank, a secondary determination is made on whether there is water in the water tank when the water pump is not working at full speed through the change of the resistance value between the two electrodes, so as to improve the reliability of water-free detection.

In this embodiment, a second judgment is made on whether there is water in the water tank according to the judgment parameters, which may include:

Detect the resistance value between the two electrodes within the preset time period; when the resistance value continues to rise within the preset time period, it is determined that there is no water in the water tank.

In practical applications, when the electrodes are stuck or the user uses water with a high Total dissolved solids (TDS) value, although the resistance value between the two electrodes will be lower than the resistance threshold when there is no water, compared with In the state of water, the resistance value between the two electrodes will increase obviously. In this embodiment, the change of the resistance value between the two electrodes can be used to effectively identify whether there is water in the water tank.

In this embodiment, when the water pump is not working at full speed, by detecting the resistance value between the two electrodes during the working process of the water pump, the resistance value between the two electrodes continues to rise within a preset time period, and the water tank can be determined twice. No water inside.

In the water shortage detection method of the food processing machine provided by the embodiment of the present invention, when the electrode is stuck or the user uses water with a high TDS value, which makes the electrode detection invalid, and it is judged that there is water in the water tank, compared with the state when there is water, The resistance value between the two electrodes will increase significantly when there is no water. In this embodiment, by detecting the rising trend of the resistance value between the two electrodes and performing a second judgment, it is possible to effectively identify whether there is water in the water tank, and improve the reliability of water-free detection.

In an exemplary embodiment of the present invention, after the second determination that there is no water in the water tank through the temperature of the steam generator or the rising trend of the resistance value between the two electrodes, it may also include:

Control the water pump to work at full speed, and detect the pumping current value when the water pump is working at full speed, and make three judgments on whether there is water in the water tank according to the pumping current value; among them, when the pumping current value is less than the current threshold, it is judged that there is no water in the water tank.

In this embodiment, the presence or absence of water is first judged by the resistance value of the electrode. When the first judgment is made of water, the second judgment is made by the change of the resistance value of the electrode or the temperature of the steam generator. The current value is used to judge whether there is water or not three times to ensure that the judgment of whether there is water is reliable and accurate, and to improve the reliability of water-free detection.

In one example, during the working process of the food processor, if the water pump is not working at full speed, within the preset time period during the working process of the water pump, the resistance value of the detection electrode rises and changes to make a second judgment. If there is no water, the water pump is forced to work at full speed. The current value of the water pump is checked three times to determine whether there is water. When the current value of the water pump is less than the current threshold, it can be determined that there is no water. Wherein, the preset time period may be set to 2s.

In one example, during the working process of the food processor, if the water pump is in the hot state function of the steam generator being heated, during the heating process of the steam generator, the temperature of the steam generator is detected for the second judgment, if the second judgment is not If there is no water, the water pump is forced to work at full speed. The current value of the water pump is checked three times to determine whether there is water. When the current value of the water pump is less than the current threshold, it can be determined that there is no water.

The water shortage detection method of the food processing machine provided by the embodiment of the present invention can cover all working scenarios in the working process of the steam heating food processing machine by determining whether there is water in the water tank three times, and ensure the reliability of water level detection, and the cost is low and the installation is simple. Improve the reliability and compatibility of existing anhydrous detection.

In an exemplary embodiment of the present invention, when the current running function is the cold function or the water pump is working at full speed, the determination parameter is the water pumping current value of the water pump.

In this embodiment, when the electrode determines that there is water in the water tank, a secondary determination is made on whether there is water in the water tank under the cold state function through the water pump current, so as to improve the reliability of water-free detection.

In this embodiment, a second judgment is made on whether there is water in the water tank according to the judgment parameters, which may include:

Detect the pumping current value of the water pump, and compare the pumping current value with the current threshold; when the pumping current value is less than the current threshold, it is determined that there is no water in the water tank.

In this embodiment, when the cold function steam generator is not working, the water pump pumps water at full speed. If there is water in the water tank, the water pumping current of the water pump is large; if there is no water in the water tank, the water pumping current of the water pump is small.

In an example, the method for detecting water shortage of a food processor provided in an embodiment of the present invention may further include: determining that there is water in the water tank when the water pumping current value is greater than or equal to a current threshold.

In this embodiment, under the cold state function, it is judged whether there is water in the water tank by detecting the pumping current (which may be called the working current of the water pump) when the water pump is working. If the pumping current I of the water pump ≥ current threshold C, it is determined that there is water in the water tank, and continue Work. If the pumping current I of the water pump is less than the current threshold C, it is determined that there is no water in the water tank, and the user is reminded to add water.

In this embodiment, the electrode combined with the cold state function is used to detect whether there is water in the water tank, which can avoid the misjudgment that no water is judged to be water only through the resistance value collected by the electrode, and avoid a certain delay only through the current detection of the water pump Sexual problems, thereby improving the reliability of anhydrous detection.

In an example, the method for detecting water shortage of a food processor provided in an embodiment of the present invention may further include:

When the food processor enters the first preset mode, detect the first current value when the water pump is idle at full speed, and detect the second current value when the water pump pumps water at full speed; determine the current threshold according to the first current value and the second current value .

Wherein, the first preset mode may be a factory mode or a pipeline cleaning mode.

In this embodiment, when the cold state function is used, the water pump pumps water at full speed, and the current threshold C can be based on the first current value I ₁ when the main control chip detects that the water pump is empty at full speed when the food processor is produced, and when the water pump pumps water at full speed. The second current value _I2 is determined, which specifically may include the following steps:

When the food processor leaves the factory, the water pumping test is carried out. Among them, distilled water can be used for full-speed pumping test; the main control chip is equipped with a storage module. The value I ₁ and the second current value I ₂ when there is no water are stored in the storage module; the current threshold C is determined by the formula C=(I ₁ +I ₂ )/2.

In the water shortage detection method of the food processing machine provided by the embodiment of the present invention, when the user selects the cold state function, the water pump can work at full speed. When the electrode detection fails and the water tank is judged to have water, it can be effectively identified by detecting the current value of the water pump. Whether there is water in the water tank improves the reliability of water-free detection. In addition, pumping calibration can be performed on each water pump before leaving the factory to determine the current threshold corresponding to different water pumps, so as to ensure the reliability of detection.

In an exemplary embodiment of the present invention, the method for detecting water shortage of a food processor provided by the embodiment of the present invention may further include:

When the food processor enters the second preset mode, determine the first resistance value when the electrode detects distilled water, and determine the second resistance value when the electrode detects no water; determine according to the first resistance value and the second resistance value resistance threshold.

Wherein, the second preset mode may be a factory mode or a pipeline cleaning mode.

In this embodiment, the resistance threshold value A can be determined according to the first resistance value _R1 when the electrode detects distilled water and the second resistance value _R2 when the electrode is dry when the food processor is produced, which specifically may include the following steps:

When the food processor leaves the factory, the water pumping test is performed, and distilled water can be used for full-speed pumping test; the main control chip is equipped with a memory module, and the first resistance value R ₁ when the electrode detects the distilled water is detected during the water pumping test of the food processor. The second resistance value R ₂ when there is no water with the electrode is stored in the memory module; the current threshold A is determined by the formula A=(R ₁ +R ₂ )/2.

The water shortage detection method of the food processing machine provided by the embodiment of the present invention uses distilled water to calibrate the electrode before leaving the factory, so as to ensure that the resistance threshold used for judging whether the electrode has water can effectively distinguish the water type with the least impurities: distilled water with water and no water The state of the water, to ensure the reliability of the electrode anhydrous detection. In addition, each food processor is individually pumped and checked to determine the resistance threshold corresponding to different food processors, which can avoid component errors and ensure detection reliability.

In addition, since the resistance threshold A is set using distilled water calibration, and the resistance value of other water is lower than that of distilled water, it can be ensured that when the electrode detects that the resistance value of water is greater than or equal to the resistance threshold A, the water tank must be in an anhydrous state.

Fig. 3 is a flowchart of a water shortage detection method for a food processing machine provided by an exemplary embodiment of the present invention, as shown in Fig. 3 , which may specifically include:

S301: The water level detection module detects the resistance value R of the water.

In this embodiment, the water level detection module may include two metal electrodes.

S302: Determine whether the resistance value R of the water is greater than the resistance threshold value A. If yes, execute S303; otherwise, execute S305.

S303: It is determined that there is no water in the water tank.

S304: Remind the user to add water.

S305: Determine whether the running function is a hot state function. If yes, execute S306; otherwise, execute S308.

S306: Detect the temperature T of the steam generator.

S307: Determine whether the steam generator temperature T>temperature threshold B. If yes, execute S303; otherwise, exit.

S308: Detect the pumping current value I of the water pump.

S309: Determine whether the water pumping current value I<water pump threshold C. If yes, execute S303; otherwise, exit.

In the water shortage detection method of the food processing machine provided by the embodiment of the present invention, the primary determination of anhydrous detection is performed through the electrodes, and when the electrodes determine that there is water, the thermal state function is determined for the second time through the temperature of the steam generator; or the water pump current is used to determine the water shortage. The cold state function performs secondary judgment, which can improve the reliability of anhydrous detection, and the cost is low and the installation is simple.

Fig. 4 is a flowchart of a water shortage detection method for a food processing machine provided by an exemplary embodiment of the present invention, as shown in Fig. 4 , which may specifically include:

S401: Determine whether the electrode water level AD value > resistance threshold A. If yes, execute S402; otherwise, execute S403.

Among them, the electrode water level AD value is the resistance value R of the water.

S402: the water level flag Flag_SW_state=0; clear the AD value increase flag flag_AD=0, go to 413.

Wherein, the water level flag Flag_SW_state=0 indicates that there is no water, and the water level flag Flag_SW_state=1 indicates that there is water.

S403: The water level flag Flag_SW_state=1.

S404: Determine whether the temperature of the steam generator is greater than a temperature threshold during the working process of the water pump or the steam generator. If yes, execute S405; otherwise, execute S406.

S405: The water pump is forced to draw water at full speed, and the heating power of the steam generator is reduced to the lowest gear.

S406: Determine whether the water pump pumps water at full speed. If yes, execute S407; otherwise, execute S411.

S407: Determine whether the pumping current value of the water pump for the continuous time T2 is less than the current threshold. If yes, execute S408; otherwise, execute S409.

S408: the water level flag Flag_SW_state=0, no water alarm, go to S401.

S409: Determine whether the AD value increase flag flag_AD=1, if yes, execute S410; otherwise, end.

Wherein, the AD value increase flag flag_AD=1 indicates that there is water, and the AD value increase flag flag_AD=0 indicates that there is no water.

S410: Clear the AD value increase flag flag_AD=0, and the water pump pumps water normally.

S411: Determine whether the AD value detected for the continuous time T1 during the working process of the water pump increases. If yes, execute S412; otherwise, end.

S412: Set the AD value increase flag flag_AD=1, force the water pump to draw water at full speed, and execute S401.

S413: No water alarm, the water pump pumps water intermittently.

In this embodiment, when it is determined that there is no water in the water tank, an alarm for no water can be given to remind the user to add water. When there is no water alarm, the water pump can work intermittently.

In one example, when there is no water alarm, the water pump can work at full speed for 1 second to 2 seconds and stop for 20 seconds to 30 seconds.

In the water shortage detection method of the food processing machine provided by the embodiment of the present invention, the primary determination of the absence of water is carried out through the electrodes. When judging whether there is no water, the current value of the water pump is used to judge whether there is water or not three times to ensure that the judgment of whether there is water is reliable and accurate, and the cost is low, and the installation is simple, which improves the reliability and compatibility of the existing anhydrous detection.

The water shortage detection method of the food processing machine and the food processing machine provided by the embodiments of the present invention can effectively solve the problems of high hardware cost and complicated design of the anhydrous detection module of the existing steam heating food processing machine; solve the problem of the existing steam heating food processing machine The assembly of the anhydrous detection module is complicated and the production efficiency is low; solve the problem that the anhydrous detection module of the existing steam heating food processor has low reliability and the detection is easy to fail; solve the problem that the water pump continues to work when the existing steam heating food processor is anhydrous Can cause grout overflow problems.

Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, the functional modules/units in the system, and the device can be implemented as software, firmware, hardware, and an appropriate combination thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be composed of several physical components. Components cooperate to execute. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile media implemented in any method or technology for storage of information, such as computer readable instructions, data structures, program modules, or other data. permanent, removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, tape, magnetic disk storage or other magnetic storage devices, or can Any other medium used to store desired information and which can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

Claims (7)

1. A method for detecting water shortage of a food processor, the food processor comprises a base and a processing assembly arranged on the base, the processing assembly includes a cup, a crushing device and a cup cover, the cup and The cup cover cooperates to form a processing chamber, and a water tank, a water pump and a steam generator are also provided on the base, and two electrodes are provided on the pipeline of the water outlet of the water tank. It is characterized in that the method includes: detecting a resistance value between the two electrodes, comparing said resistance value to a resistance threshold; When the resistance value is less than or equal to the resistance threshold value, determine the current operating function of the food processor, and the operating function includes the hot state function of the steam generator being heated and the unheated state function of the steam generator The cold state function, or, the operation function includes the water pump working at full speed or the water pump not working at full speed; Determine the judging parameter according to the current operating function, when the current operating function is a thermal function, the judging parameter is the temperature of the steam generator; or, when the current operating function is that the water pump is not working at full speed, the judging parameter is The change trend of the resistance value; or, when the current operating function is a cold function or the water pump is working at full speed, the determination parameter is the pumping current value of the water pump; A second judgment is made on whether there is water in the water tank according to the judgment parameters. 2. The method according to claim 1, characterized in that, the secondary determination of whether there is water in the water tank according to the determination parameters comprises: detecting the temperature of the steam generator, and comparing the temperature of the steam generator with a temperature threshold; When the temperature of the steam generator is greater than the temperature threshold, it is determined that there is no water in the water tank. 3. The method according to claim 1, characterized in that, the secondary determination of whether there is water in the water tank according to the determination parameters comprises: Detect the resistance value between two electrodes within a preset time period; When the resistance value continues to rise within the preset time period, it is determined that there is no water in the water tank. 4. The method according to claim 2 or 3, characterized in that, after the second determination that there is no water in the water tank, the method further comprises: controlling the water pump to work at full speed, and detecting the pumping current value when the water pump is working at full speed, and performing three judgments on whether there is water in the water tank according to the pumping current value; Wherein, when the pumping current value is less than the current threshold, it is determined that there is no water in the water tank. 5. The method according to claim 1, characterized in that, the secondary determination of whether there is water in the water tank according to the determination parameters comprises: Detecting the pumping current value of the water pump, and comparing the pumping current value with a current threshold; When the water pumping current value is less than the current threshold, it is determined that there is no water in the water tank. 6. The method according to claim 5, further comprising: When the food processing machine enters the first preset mode, detecting the first current value when the water pump is empty at full speed, and detecting the second current value when the water pump is pumping water at full speed; determining the current threshold according to the first current value and the second current value; When the food processor enters the second preset mode, determining a first resistance value when the electrodes detect distilled water, and determining a second resistance value when the electrodes detect no water; The resistance threshold is determined according to the first resistance value and the second resistance value. 7. A food processing machine, characterized in that it includes a base and a processing assembly located on the base, the processing assembly includes a cup body, a crushing device and a cup cover, and the cup body and the cup cover are matched to form In the processing chamber, a water tank, a water pump and a steam generator are also arranged on the base, and two electrodes are arranged on the pipeline of the water outlet of the water tank; The food processing machine further includes a main control chip, and the main control chip is used to execute the method for detecting water shortage of the food processing machine according to any one of claims 1-6.

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