CN111166155B - Cooking control method of steam heating type cooking appliance - Google Patents
Cooking control method of steam heating type cooking appliance Download PDFInfo
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- CN111166155B CN111166155B CN201811338061.3A CN201811338061A CN111166155B CN 111166155 B CN111166155 B CN 111166155B CN 201811338061 A CN201811338061 A CN 201811338061A CN 111166155 B CN111166155 B CN 111166155B
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- 238000010411 cooking Methods 0.000 title claims abstract description 196
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- 235000007164 Oryza sativa Nutrition 0.000 description 14
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- 235000021395 porridge Nutrition 0.000 description 8
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/04—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/32—Time-controlled igniting mechanisms or alarm devices
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/04—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
- A47J2027/043—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels for cooking food in steam
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Abstract
The invention discloses a cooking control method of a steam heating type cooking appliance, belongs to the field of kitchen appliances, and solves the problem that the steam quantity of the existing steam heating appliance is not adjustable, and the cooking control method of the steam heating type cooking appliance comprises the following steps: the control unit calls a matched steam cooking program according to the selected cooking function; the control unit executes a steam cooking program and controls the boiler and the water pump to work according to steam parameters set in the steam cooking program; wherein the steam parameter comprises steam output. Based on the above scheme, the requirements of different cooking functions on the steam quantity are met, the expected cooking effect can be achieved, and the waste of steam energy can not be caused.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of kitchen appliances, in particular to a cooking control method of a steam heating type cooking appliance.
[ background of the invention ]
The electric cooker is one of the current common kitchen cooking appliances, can be used for cooking rice, cooking porridge, cooking soup and the like in function, and meets the requirements of people on fast-paced work and life. At present, the known household electric rice cooker mainly has the following heating modes: the inner container is heated through the heating disc or the electromagnetic wire coil, the heating mode is easy to cause the problems of local high temperature, pot pasting and the like, and real three-dimensional heating cannot be realized; the other is steam heating, and compared with the steam heating, the steam heating has better heating uniformity and can solve the problems existing in the traditional electric heating, so that the steam heating mode gradually gains attention from the industry in recent years.
Taking a steam heating type electric rice cooker as an example, a water pump (electromagnetic pump) is generally adopted to supply water to a boiler, the boiler heats water to generate steam, the steam is introduced into a container for containing food to directly heat the food, or the steam heats the container for containing food to indirectly heat the food, the cooking effect of steam heating is ensured, corresponding steam output quantity and steam temperature are required to be matched in different cooking functions or different heating stages in the same cooking function, in terms of cooking, the steam quantity and the steam temperature required in a water absorption stage, a gelatinization stage and a stewing stage are different from each other so as to meet the requirements of sufficient water absorption and gelatinization of rice, however, no matter a water storage type boiler or an instant heating type boiler is adopted in the prior art, the adaptive adjustment of the steam quantity according to the requirements of the cooking function is not realized, the cooking function with large steam demand or the cooking program can not reach the expected cooking purpose due to insufficient actual steam quantity, and the cooking function or cooking program with small steam demand not only affects the cooking effect but also wastes steam energy because of excessive steam. The present application has made further studies in view of the above-mentioned problems.
[ summary of the invention ]
The technical problem to be solved by the invention is to provide a cooking control method of a steam heating type cooking appliance to overcome the defects of the prior art, which can meet the requirements of different cooking functions on steam quantity so as to improve the steam cooking effect.
In order to solve the technical problems, the invention adopts the following technical scheme:
a cooking control method of a steam heating type cooking appliance including a control unit, a boiler for heating water to generate steam, and a water pump for supplying water to the boiler, characterized in that the steam heating type cooking appliance includes a plurality of selectable cooking functions, the control unit prestores a plurality of steam cooking programs matching the plurality of cooking functions, the cooking control method comprising:
the control unit calls a matched steam cooking program according to the selected cooking function;
the control unit executes a steam cooking program and controls the boiler and the water pump to work according to steam parameters set in the steam cooking program;
wherein the steam parameter comprises steam output.
In the cooking control method of the steam heating type cooking appliance, the control unit controls the output water amount of the water pump according to the steam output amount set in the steam cooking program.
In the cooking control method of the steam heating type cooking appliance, at least one steam cooking program comprises a plurality of cooking sub-programs which are sequentially performed, and the control unit controls the boiler and the water pump to work according to steam parameters set in the plurality of cooking sub-programs.
In the cooking control method of the steam heating type cooking appliance, the steam parameter further includes a steam temperature, and the control unit controls the boiler and the water pump to operate according to the steam temperature set in the steam cooking program to generate constant temperature steam.
In the cooking control method of the steam heating type cooking appliance, the method in which the control unit controls the operation of the boiler and the water pump according to the steam temperature set in the steam cooking program includes:
the power adjusting stage is that the water pump supplies water to the boiler at a constant flow rate, basic power P1 is determined according to the actual temperature T1 of steam output by the boiler, temperature compensation power P2 is determined according to the temperature change trend of the steam output by the boiler, and the boiler is heated by total power P (P1 + P2) until the change of the actual temperature of the steam output by the boiler in a first time period tends to zero, and enters a steady state;
in the flow regulation stage, after the steady state is started, the actual temperature T1 is compared with the set steam temperature T0, and the temperature compensation flow F2 is determined according to the comparison result, the water pump supplies water to the boiler at the total flow F1+ F2, wherein F1 is the basic flow of the water pump;
the power regulation phase and the flow regulation phase are cycled until the actual temperature T1 of the boiler output steam reaches the set steam temperature T0.
In the cooking control method of the steam heating cooking appliance, in the power adjusting stage, the base power P1 is (the set steam temperature T0 is the target power P0)/the actual temperature T1, wherein the target power P0 is a constant of the system matching set steam temperature T0.
In the cooking control method of the steam heating type cooking appliance, in the power adjusting stage, the voltage compensation power P3 is determined according to the input voltage of the boiler, and the boiler is heated with the total power P1+ P2+ P3.
In the cooking control method of the steam heating type cooking appliance, in the flow rate adjusting stage, a voltage compensation flow rate P3 is determined according to an input voltage of the water pump, and the water pump supplies water to the boiler at a total flow rate F1+ F2+ F3.
In the cooking control method of the steam heating type cooking appliance, the steam heating type cooking device includes a temperature sensor that directly senses a steam temperature, or the temperature sensor indirectly acquires the steam temperature by detecting the boiler temperature.
In the cooking control method of the steam heating type cooking appliance, the boiler is an instantaneous boiler or a water storage boiler.
The invention has the beneficial effects that:
the size of the steam output quantity is influenced by the heating power of the boiler and the water supply quantity of the water pump, and by adopting the cooking control method, the control unit of the steam heating type cooker calls matched steam cooking programs according to the selected cooking function, and the steam output quantities capable of meeting the corresponding cooking functions are set in the matched steam cooking programs; in the cooking process, the control unit controls the boiler and the water pump to work by taking the set steam output as a target, sufficient steam output is provided for the cooking function with large steam demand, and the steam output is properly reduced for the cooking function with small steam demand, so that the requirements of different cooking functions on the steam quantity are met, the expected cooking effect can be achieved, and the waste of steam energy is avoided.
The steam output quantity in the technical scheme of the invention refers to the total quantity of steam required by corresponding cooking functions, the total quantity of steam is calculated according to the total water supply quantity, the total water supply quantity is determined according to the water supply quantity and the cooking time of a water pump in unit time, the heating power of a boiler is matched according to the set water supply quantity of the water pump, the heating power of the boiler needs to be increased to ensure the stable output of the steam when the water supply quantity of the water pump is larger, namely, the control unit controls the boiler and the water pump to work according to the steam output quantity set in a steam cooking program.
At least one steam cooking program comprises a plurality of cooking sub-programs which are sequentially carried out, and the control unit controls the boiler and the water pump to work according to steam parameters set in the plurality of cooking sub-programs. Aiming at the condition that the steam cooking program comprises a plurality of cooking sub-programs which are sequentially carried out, the steam output quantity meeting the requirements of each cooking sub-program is also set in each cooking sub-program, and the control unit controls the boiler and the water pump to work according to the steam output quantity set in the plurality of cooking sub-programs, so that the adjustment of the steam output quantity of the steam cooking program at different stages can be realized.
The steam parameters also comprise steam temperature, and the control unit controls the boiler and the water pump to work according to the steam temperature set in the steam cooking program so as to generate constant-temperature steam. Based on the scheme, the steam output quantity adjusting device can realize the adjustment of the steam output quantity and the constant temperature output of the steam, so that the requirements of different cooking functions or cooking programs on the steam output quantity and the steam temperature can be met.
The method for controlling the boiler and the water pump to work by the control unit according to the steam temperature set in the steam cooking program comprises the following steps: the power adjusting stage is that the water pump supplies water to the boiler at a constant flow rate, basic power P1 is determined according to the actual temperature T1 of steam output by the boiler, temperature compensation power P2 is determined according to the temperature change trend of the steam output by the boiler, and the boiler is heated by total power P (P1 + P2) until the change of the actual temperature of the steam output by the boiler in a first time period tends to zero, and enters a steady state; in the flow regulation stage, after the steady state is started, the actual temperature T1 is compared with the set steam temperature T0, and the temperature compensation flow F2 is determined according to the comparison result, the water pump supplies water to the boiler at the total flow F1+ F2, wherein F1 is the basic flow of the water pump; the power regulation phase and the flow regulation phase are cycled until the actual temperature T1 of the boiler output steam reaches the set steam temperature T0.
The boiler heating power and the water supply amount of the water pump are influenced by various factors to generate deviation, the deviation of the heating power among a plurality of boilers and the deviation of the water supply amount among a plurality of water pumps are different, although the deviation cannot be detected by the conventional technical means, the deviation can be reflected on the change of the temperature of output steam, the temperature of the output steam is taken as a target, the boiler heating power and the water supply amount of the water pump are adjusted, and the temperature of the output steam can be effectively controlled. Therefore, in the method provided by the invention, power regulation is firstly carried out under the condition of constant flow of the water pump, in the power regulation stage, the basic power of the boiler system is determined according to the temperature of the steam output by the current boiler, and then power compensation is realized through the temperature compensation power determined by the temperature change trend of the steam output by the boiler, so that the boiler system can enter a steady state more quickly; if the power adjusting stage does not reach the expected target temperature, adjusting the water supply amount of the water pump according to the difference between the power adjusting stage and the set steam temperature, wherein the change of the water supply amount of the water pump destroys the previous stable state, so that the temperature of the steam output by the boiler changes, the boiler system returns to the power adjusting stage again, the basic power is re-determined according to the changed steam temperature, the temperature compensation power is re-determined and the power compensation is performed, so that the boiler system enters the stable state again, namely the power adjusting stage and the flow adjusting stage are performed circularly until the actual temperature of the steam output by the boiler reaches the set steam temperature, and the boiler system can continuously and stably output the steam with the set steam temperature under the condition that the heating power of the boiler and the water supply amount of the water pump are not changed.
It can be seen from the above method that: the boiler system adjusts the boiler heating power and the water supply amount of the water pump each time based on the feedback of the actual temperature and the change of the steam output by the boiler, namely, the water pump supplies water to the boiler, the boiler heats the water to generate steam, the temperature of the output steam is detected and fed back, the water supply amount of the water pump or the heating power of the boiler is adjusted according to feedback information to form a closed loop control system, so that the steam heating type cooking appliance can continuously and stably output the steam with the set steam temperature by applying the method provided by the invention, and the temperature of the output steam can be changed according to the cooking function requirement.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
The invention is further described below with reference to the accompanying drawings:
fig. 1 is a schematic perspective view of a steam heating type cooking appliance according to an embodiment of the present invention;
FIG. 2 is a flow chart of a cooking control method according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of a cooking control method for steam temperature control in an embodiment of the present invention;
fig. 4 is a flowchart of a cooking control method for controlling steam temperature according to an embodiment of the present invention.
Reference numerals:
100 pot body, 110 bearing table;
200 cooking vessel, 210 vessel body, 220 lid.
[ detailed description ] embodiments
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, the steam temperature control method of a steam heating cooking appliance according to the present invention includes a cooker body 100 and a cooking container 200, wherein a susceptor 110 extends outward from one side of the cooker body 100, the cooking container 200 is detachably mounted on the susceptor 110, the cooking container 200 includes a container body 210 and a cover 220, a steam injection port is formed on the cover 220, and a boiler for heating water to generate steam and a water pump for supplying water to the boiler are provided in the cooker body 100. During actual cooking, steam generated by the boiler is introduced into the container body 210 through the steam inlet on the cover 220, and the steam heating manner is different according to the selected cooking function, for example, under the cooking function, the steam heats the container body 210, and further, rice grains in the container body 210 absorb water, are cooked, and the like; if the porridge cooking function is performed, the steam is directly introduced into the cavity of the container body 210 for containing food, and the food and the water in the cavity are directly heated.
The boiler described in the embodiment is preferably an instant heating boiler, the instant heating boiler is provided with a heating pipe and a water delivery pipe, the heating pipe heats the water delivery pipe, and certain pressure can be generated in the water delivery pipe in the heating process, so that the instant heating boiler can generate superheated steam higher than 100 ℃, and steam temperature required by more cooking functions can be met. The boiler heating power described below, that is, the heating tube power; the boiler is also provided with a temperature sensor which can calculate the temperature of the steam output by the boiler by detecting the temperature of the boiler.
The water pump in the embodiment is preferably an electromagnetic pump, the electromagnetic pump is similar to a common electromagnetic valve in working principle, alternating current is used as working power, alternating magnetic field is formed by current through an electromagnetic winding, interaction is formed between the alternating magnetic field and the movable pump body, the pump body is driven to vibrate, and liquid is pushed to be output.
The water pump and the boiler of the embodiment constitute a boiler system, and are controlled by a control unit of the steam heating type cooking appliance, specifically: the control unit comprises a first silicon controlled drive module used for adjusting the flow of the water pump (the water quantity delivered by the water pump to the boiler in unit time) and a second silicon controlled drive module used for adjusting the heating power of the boiler, wherein the first silicon controlled drive module adjusts the power of the water pump by changing the conduction angle of the power supply voltage of the water pump, and further the purpose of adjusting the flow of the water pump is achieved. Of course, the invention does not exclude other technical means known in the art for regulating the boiler heating power and the water pump flow, if this is optional.
According to the problem that the steam output quantity cannot be adjusted in the prior art, the embodiment of the invention provides the following cooking control method:
the control unit calls a matched steam cooking program according to the selected cooking function;
the control unit executes a steam cooking program and controls the boiler and the water pump to work according to steam parameters set in the steam cooking program; wherein the steam parameter comprises steam output.
The steam heating type cooking appliance comprises a plurality of optional cooking functions, such as cooking, cooking porridge, cooking soup and the like, the requirements of the cooking functions on steam output quantity are different, so a plurality of steam cooking programs matched with the cooking functions are prestored in the control unit, and when the steam heating type cooking appliance is used, the steam heating type cooking appliance is automatically matched with the corresponding steam cooking program according to the cooking function selected by a user; in the cooking process, the control unit controls the boiler and the water pump to work by taking the set steam output as a target, sufficient steam output is provided for the cooking function with large steam demand, and the steam output is properly reduced for the cooking function with small steam demand, so that the requirements of different cooking functions on the steam quantity are met, the expected cooking effect can be achieved, and the waste of steam energy is avoided.
As shown in fig. 2, the steam heating type cooking appliance has a rice cooking function, a porridge cooking function and a soup cooking function, the control unit prestores a steam rice cooking procedure matched with the rice cooking function, a steam porridge cooking procedure matched with the porridge cooking function and a steam soup cooking procedure matched with the soup cooking function, the requirements of the rice cooking function, the porridge cooking function and the soup cooking function for steam output quantity are different, during the execution of the steam congee cooking procedure and the steam soup cooking procedure, however, there is generally no need to adjust the steam output, the steam rice cooking procedure usually includes cooking sub-procedures which are performed in sequence, such as a water absorption procedure, a gelatinization procedure, an aroma enhancement procedure, a heat preservation procedure and the like, and each cooking sub-procedure also sets a steam output quantity meeting the respective requirement, so that the steam output quantity is adjusted along with different stages of the steam rice cooking procedure in the process of executing the steam rice cooking procedure.
The steam output quantity set by the steam cooking program refers to the total quantity of steam required by the cooking function, the steam output quantity set by the cooking sub-program refers to the steam quantity required by the cooking sub-program, the steam output quantities can be calculated according to the water supply quantity of the water pump, the water supply quantity of the water pump is determined according to the water supply quantity of the water pump in unit time and cooking time, the boiler heating power is matched according to the set water supply quantity of the water pump, and the boiler heating power needs to be increased to ensure stable output of the steam when the water supply quantity of the water pump is larger. Therefore, when the steam porridge cooking procedure or the steam soup cooking procedure is executed, the cooking time is controlled to meet the cooking requirement on the premise of setting the steam output quantity; when the steam cooking program is executed, the operation of a boiler and a water pump is controlled according to the steam output quantity set by each cooking subprogram in the steam cooking program, and the cooking time of each cooking subprogram is controlled on the premise of setting the steam output quantity, so that the cooking requirement can be met. The steam total amount can be set according to the requirement of the rice cooking function when the steam rice cooking program is executed, enough steam output amount is provided for the cooking subprogram with large steam demand, such as a water absorption program and a gelatinization program, the steam amount requirement of the cooking subprogram is met, the cooking time of the cooking subprogram can be shortened, the steam output amount is properly reduced for the cooking subprogram with small steam demand, such as a heat preservation program, so that the steam output amount in each cooking subprogram can be reasonably distributed on the premise of keeping the total amount basically unchanged, the cooking requirement is met, and the total cooking time can be shortened.
Through the above scheme of this embodiment, give sufficient steam output to the cooking function or the cooking stage that steam demand is big, then suitably reduce steam output to the cooking function or the cooking stage that steam demand is little, satisfied different cooking functions and different cooking stages under the same cooking function demand to the demand of steam volume, can reach anticipated cooking effect like this, can not cause the waste of steam energy again.
According to the problems that the steam temperature is uncontrollable and the constant-temperature output of the steam is difficult to maintain in the prior art, the embodiment of the invention also provides a control method aiming at the steam temperature, namely: the steam parameters also comprise steam temperature, the control unit controls the boiler and the water pump to work according to the steam temperature set in the steam cooking program so as to generate constant-temperature steam, and the specific implementation method comprises the following steps:
referring to fig. 3 and 4, the steam temperature control method of the steam heating type cooking appliance includes:
in the power adjusting stage, a water pump supplies water to a boiler at a constant flow rate, basic power P1 is determined according to the actual temperature T1 of steam output by the boiler, temperature compensation power P2 is determined according to the temperature change trend of the steam output by the boiler, the boiler is heated by total power P (P1 + P2) until the change of the actual temperature of the steam output by the boiler in a first time period tends to zero, and the boiler enters a steady state;
in the flow regulation stage, after the steady state is started, the actual temperature T1 is compared with the set steam temperature T0, the temperature compensation flow F2 is determined according to the comparison result, and the water pump supplies water to the boiler at the total flow F (F1 + F2), wherein F1 is the basic flow of the water pump;
the power regulation phase and the flow regulation phase are cycled until the actual temperature T1 of the boiler output steam reaches the set steam temperature T0.
In the power regulation stage, the water pump supplies water to the boiler at a constant flow rate, namely the working state of the water pump is kept on the premise of not changing the power of the water pump, although the actual flow rate of the water pump is influenced by factors such as water temperature change and the like, the actual flow rate of the water pump is finally reflected on the temperature change of steam output by the boiler, and the influence of the factors can be eliminated through subsequent power compensation.
In the power regulation phase, a base power P1 is first determined from the actual temperature T1 of the boiler output steam, it being understood that: the temperature and the power are in corresponding relation, if the target temperature is set to be T0, the target power is P0, the set steam temperature T0 is set by the control unit according to the requirements of different cooking functions and/or cooking programs on the steam temperature, for example, in the case of determining to execute the cooking functions and/or the cooking programs, the control unit automatically matches the corresponding set steam temperature T0, and the target power P0 is a constant matching the set steam temperature T0. The set target value is the set steam temperature T0 and the target power P0, the current value is the actual temperature T1 and the base power P1, and the final objective is to bring the current value to the target value, i.e. the actual temperature T1 and the base power P1 are the set steam temperature T0 and the target power P0, and in the case that the actual temperature T1 does not reach the set steam temperature T0, the requirement can only be met by providing a base power P1 that is greater than the target power P0, and vice versa. From this, the base power P1 (set steam temperature T0 target power P0)/actual temperature T1 can be determined.
If the boiler system is heated only by the basic power P1, the temperature of the steam output by the boiler usually fluctuates greatly and is difficult to stabilize in a short time, so that the temperature compensation power P2 needs to be determined according to the temperature variation trend of the steam output by the boiler, namely, the basic power P1 is compensated by the temperature compensation power P2. Namely, when the temperature change of the steam output by the boiler in the second time period exceeds a threshold value, specifically: when the temperature change of the boiler output steam in the second time period is in an ascending trend, determining the compensation amount of the temperature compensation power P2 according to the temperature ascending value in the second time period; when the temperature change of the boiler output steam in the second time period is in a descending trend, determining the compensation amount of the temperature compensation power P2 according to the temperature descending value in the second time period. The following are exemplary: setting the second time period to be 1s, setting the threshold value to be 2 ℃, and correspondingly increasing or decreasing the power by 50W when the steam temperature change exceeds the threshold value and every time the steam temperature change exceeds 1 ℃; for example, if the temperature of the output steam of the boiler rises by 3 ℃ within 1s and exceeds the threshold value of 1 ℃, the power is reduced by 50W, namely P2 is-50W, so as to slow down or change the rising trend of the temperature; if the temperature of the output steam of the boiler drops by 4 ℃ within 1s and exceeds the threshold value of 2 ℃, the power is increased by 100W, namely P2 is 100W, so that the temperature drop trend is slowed down or changed.
In the above example, if the power is not compensated according to the trend of the steam temperature change, when the temperature of the steam output by the boiler rises by 3 ℃ within 1s, the temperature of the steam output by the boiler can still keep rising trend in the following time until the peak value; on the contrary, when the temperature of the steam output by the boiler drops by 4 ℃ within 1s, the temperature of the steam output by the boiler may continue to keep on dropping trend until the valley value in the following time, which causes great fluctuation of the temperature of the steam output by the boiler and is difficult to reach the stability in a short time. However, by the above compensation means of this embodiment, the rising and falling trend of the steam temperature can be predicted according to the actually fed back steam temperature, and corresponding power compensation is performed, so that the total power P of the boiler changes, and accordingly, the temperature of the steam output by the boiler changes, and by the compensation of the temperature compensation power P2, the rising or falling trend of the temperature is slowed down or changed, and the difference between the peak value and the valley value of the steam temperature is reduced, that is, the fluctuation range of the steam temperature is reduced, so that the temperature of the steam output by the boiler can be stabilized in a short time, that is, the boiler system can enter a steady state more quickly, where the steady state is: the change of the actual temperature of the steam output by the boiler in the first time period tends to zero, for example, within 20 s-30 s, the change of the actual temperature T1 of the steam output by the boiler does not exceed 2 ℃, namely, the boiler system is judged to enter a steady state, and the steady state is continued all the time under the condition that the heating power of the boiler and the water supply amount of the water pump are not changed, so that the constant temperature output of the steam is maintained.
After the power adjusting stage, the actual temperature T1 of the steam output by the boiler does not necessarily reach the set steam temperature T0, and at this time, the flow rate of the water pump needs to be adjusted, and the flow rate of the water pump decreases, and the steam temperature increases under the same boiler heating power, and on the contrary, the flow rate of the water pump increases, and the steam temperature decreases under the same boiler heating power, so as to change the actual temperature T1 of the steam output by the boiler, that is, after the steady state is entered in the above flow rate adjusting stage, the actual temperature T1 is compared with the set steam temperature T0, and the temperature compensation flow rate F2 is determined according to the comparison result, and the water pump supplies water to the boiler at a total flow rate F1+ F2, and F1 is the basic flow rate of the water pump, and can also be understood as the original set flow rate of the water pump. Specifically, the method comprises the following steps: the compensation amount of the temperature compensation flow rate F2 is determined according to the difference between the actual temperature T1 and the set steam temperature T0, the compensation amount of the temperature compensation flow rate F2 is a negative value if the difference between the actual temperature T1 and the set steam temperature T0 is a negative value, and the compensation amount of the temperature compensation flow rate F2 is a positive value if the difference between the actual temperature T1 and the set steam temperature T0 is a positive value. The following are exemplary: if the actual temperature T1 of the boiler output steam in a steady state is 110 ℃, the set steam temperature T0 is set to be 120 ℃, and the difference value between the actual temperature T1 and the set steam temperature T0 is-5 ℃, the temperature compensation flow F2 is-2 g, the total flow F of the water pump is F1-2g, and the flow of the water pump is reduced so as to increase the temperature of the boiler output steam; if the actual temperature T1 of the boiler output steam in the steady state is 125 ℃, the set steam temperature T0 is set to be 120 ℃, and the difference between the actual temperature T1 and the set steam temperature T0 is 5 ℃, the temperature compensation flow F2 is 2g, the total flow F of the water pump is F1+2g, and the flow of the water pump is increased so as to reduce the temperature of the boiler output steam.
After the flow rate adjusting stage, the water supply amount of the water pump changes, the steady state of the boiler system is broken, correspondingly, the actual temperature T1 of the steam output by the boiler also changes, the boiler system needs to return to the power adjusting stage again, the basic power is determined again according to the adjusted water supply amount of the water pump and the changed steam temperature, the temperature compensation power is determined again and power compensation is carried out, the boiler system enters the steady state again, whether the actual temperature T1 reaches the set steam temperature T0 or not is detected in the steady state (the set steam temperature T0 +/-2 ℃ range can be considered to reach the set steam temperature T0), if the actual temperature T1 reaches the set steam temperature T0, the current boiler heating power and the water supply amount are maintained, if the actual temperature T1 does not reach the set steam temperature T0, the flow rate adjusting stage is repeated, namely the power adjusting stage and the flow rate adjusting stage are carried out circularly, until the actual temperature T1 of the boiler output steam reaches the set steam temperature T0.
It can be seen from the steam temperature control method of the present embodiment that: the boiler system adjusts the boiler heating power and the water supply amount of the water pump each time based on the feedback of the actual temperature and the change of the steam output by the boiler, namely, the water pump supplies water to the boiler, the boiler heats the water to generate steam, the temperature of the output steam is detected and fed back, the water supply amount of the water pump or the boiler heating power is adjusted according to the feedback information to form a closed loop control system, so that the steam heating type cooking appliance can continuously and stably output the steam with the target temperature, and the temperature of the output steam can be changed according to the cooking function requirement.
Because the heating pipe and the water pump of the boiler need to work by means of electric power, besides the power deviation of the heating pipe and the water pump, the fluctuation of input voltage can also affect the power of the heating pipe and the water pump, and further affect the stable output of steam, therefore, in the embodiment of the invention, in the power regulation stage, the voltage compensation power P3 is also determined according to the input voltage of the boiler, the boiler is heated by the total power P1+ P2+ P3, in practical application, the input voltage of the boiler is detected in real time by a voltage detection circuit, compared with the standard working voltage (usually 220V), the compensation value of the voltage compensation power P3 is determined according to the difference, and the power compensation is performed by changing the conduction angle of the second silicon controlled driving module; similarly, in the flow rate adjusting stage, the voltage compensation flow rate F3 is determined according to the input voltage of the water pump, the water pump supplies water to the boiler at the total flow rate F1+ F2+ F3, in practical application, the input voltage of the water pump is detected in real time through the voltage detection circuit, the compensation power of the water pump is determined according to the difference value of the input voltage of the water pump compared with the standard working voltage (usually 220V), the compensation value of the voltage compensation flow rate F3 can be obtained, and the flow rate compensation is performed by changing the conduction angle of the first thyristor driving module. It can be understood that: if the network voltage is relatively stable, the voltage compensation process can be omitted.
Although specific numerical values regarding the actual temperature T1, the set steam temperature T0, the temperature compensating power P2, the compensating flow rate F2, and the like, which are related physical quantities, are given in this embodiment, these numerical values are merely for convenience in describing and explaining the essence and technical effects of the embodiment of the present invention, and they are to be construed as any additional limitations that are not in accordance with the spirit of the present invention. In practice, the physical quantities described in this embodiment include, but are not limited to, the numerical values set forth herein.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (8)
1. A cooking control method of a steam heating type cooking appliance including a control unit, a boiler for heating water to generate steam, and a water pump for supplying water to the boiler, characterized in that the steam heating type cooking appliance includes a plurality of selectable cooking functions, the control unit prestores a plurality of steam cooking programs matching the plurality of cooking functions, the cooking control method comprising:
the control unit calls a matched steam cooking program according to the selected cooking function;
the control unit executes a steam cooking program and controls the boiler and the water pump to work according to steam parameters set in the steam cooking program;
the adjustment of the boiler heating power and the water supply amount of the water pump at each time is determined based on the feedback of the actual temperature of the steam output by the boiler and the change of the actual temperature;
the steam parameters comprise steam output quantity and steam temperature, and the control unit controls the boiler and the water pump to work according to the steam temperature set in a steam cooking program so as to generate constant-temperature steam;
the method for controlling the boiler to work by the control unit according to the steam temperature set in the steam cooking program comprises the following steps:
the method comprises the following steps that in the power adjusting stage, water is supplied to a boiler at a constant flow rate by a water pump, basic power P1 is determined according to the actual temperature T1 of steam output by the boiler, temperature compensation power P2 is determined according to the temperature change trend of the steam output by the boiler, and the boiler is heated by total power P = P1+ P2 until the change of the actual temperature of the steam output by the boiler in a first time period tends to zero, and enters a steady state;
in the power regulation phase, the base power P1= (set steam temperature T0 target power P0)/actual temperature T1, wherein the target power P0 is a constant of the system matching set steam temperature T0.
2. The cooking control method of a steam heating type cooking appliance according to claim 1, wherein the control unit controls the output water amount of the water pump according to an output amount of steam set in a steam cooking program.
3. The cooking control method of a steam heating type cooking appliance according to claim 1, wherein at least one steam cooking process includes a plurality of cooking sub-processes which are sequentially performed, and the control unit controls the operation of the boiler and the water pump according to steam parameters set in the plurality of cooking sub-processes.
4. A cooking control method of a steam heating type cooking appliance as claimed in any one of claims 1 to 3, wherein the method of the control unit controlling the operation of the water pump according to the steam temperature set in the steam cooking program includes:
in the flow regulation stage, after the steady state is started, the actual temperature T1 is compared with the set steam temperature T0, and the temperature compensation flow F2 is determined according to the comparison result, the water pump supplies water to the boiler at the total flow F = F1+ F2, wherein F1 is the basic flow of the water pump;
the power regulation phase and the flow regulation phase are cycled until the actual temperature T1 of the boiler output steam reaches the set steam temperature T0.
5. A cooking control method of a steam heated cooking appliance as claimed in claim 4, in the power regulation phase a voltage compensation power P3 is determined from the input voltage of the boiler, the boiler being heated with a total power P = P1+ P2+ P3.
6. The cooking control method of a steam heating type cooking appliance according to claim 4, wherein in the flow rate adjusting stage, a voltage compensation flow rate P3 is determined according to an input voltage of the water pump supplying water to the boiler at a total flow rate F = F1+ F2+ F3.
7. The cooking control method of a steam heating type cooking appliance according to claim 4, wherein the steam heating type cooking appliance includes a temperature sensor which directly senses a steam temperature, or the temperature sensor indirectly acquires a steam temperature by detecting the boiler temperature.
8. The cooking control method of the steam heating type cooking appliance according to one of claims 1 to 3, wherein the boiler is an instant heating type boiler or a water storage type boiler.
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| CN114680585B (en) * | 2020-12-31 | 2023-09-26 | 佛山市顺德区美的电热电器制造有限公司 | Cooking appliance, cooking control method thereof and storage medium |
| CN115670257B (en) * | 2021-07-23 | 2025-01-10 | 九阳股份有限公司 | Control method of steam cooking appliance |
| CN113576270A (en) * | 2021-07-23 | 2021-11-02 | 珠海格力电器股份有限公司 | Cooking device control method and device, controller and cooking device |
| CN114403694B (en) * | 2022-01-14 | 2023-03-14 | 珠海格力电器股份有限公司 | Control method and device of steam generator, steam cooking appliance and medium |
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