CN113974426B - Multi-section temperature field control method and system for steam oven and storage medium - Google Patents
Multi-section temperature field control method and system for steam oven and storage medium Download PDFInfo
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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
- A47J36/24—Warming devices
- A47J36/2483—Warming devices with electrical heating means
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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
- A47J37/00—Baking; Roasting; Grilling; Frying
- A47J37/06—Roasters; Grills; Sandwich grills
- A47J37/0623—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity
- A47J37/0629—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity with electric heating elements
- A47J37/0641—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity with electric heating elements with forced air circulation, e.g. air fryers
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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
- A47J37/00—Baking; Roasting; Grilling; Frying
- A47J37/06—Roasters; Grills; Sandwich grills
- A47J37/0623—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity
- A47J37/0664—Accessories
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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
Abstract
The invention relates to the technical field of temperature control of a steam oven, in particular to a multi-section temperature field control method, a system and a storage medium of the steam oven, which comprises the following steps: receiving an input PID algorithm comparison table, a cooking temperature value, a preheating target temperature value and cooking time; detecting a current temperature value; comparing the current temperature value with a preheating target temperature value; when the current temperature value is lower than the preheating target temperature, preheating by using 3D baking; when the current temperature value is greater than or equal to a preset target temperature value and less than a cooking temperature value, receiving the set maximum operation time, and starting timing; when the current time is less than the maximum operation time, calculating the slope; if the calculated slope is continuously close to 0 within the set time, closing one heating pipe according to a PID algorithm distribution temperature compensation mode; get into culinary art temperature control mode, this application can guarantee that the temperature control process is steady, and temperature control is accurate.
Description
Technical Field
The invention relates to the technical field of temperature control of a steam oven, in particular to a multi-section temperature field control method and system of the steam oven and a storage medium.
Background
The existing steaming and baking oven has four heating pipes totally, the distribution is that the internal and external heating pipes (external 1KW, internal 800W) are gone up, back heating pipe (800W) adds back stirring fan, the bottom is also has heating pipe (800W), plus 1200W's evaporator heating pipe (only can open when evaporating the mode). According to the requirement, the rated power of the steaming and baking oven cannot exceed 2KW, so that at most two pipes are operated at the same time each time, the heating speed of the cavity is limited, the heating speed of a thermal field in the steaming and baking oven is limited, and the heating speed and the cooling speed are slow. If the temperature field is not well controlled, the temperature begins to rise too high, and the temperature needs to be reduced for a long time, so that the cooking effect is influenced.
An existing patent with an application publication number of CN109464029A protects a temperature field control method and device of a steaming and baking all-in-one machine and the steaming and baking all-in-one machine, and comprises the following steps: acquiring operation instruction information input by a user, wherein the operation instruction information comprises a cooking mode, a set temperature and set time; acquiring the current cavity temperature within a preset time interval according to a cooking mode; comparing the set temperature with the current cavity temperature to obtain a temperature difference; judging whether the temperature difference is greater than 0; if the temperature difference is greater than 0, heating the load by using first heating power in different heating stages, starting a thermal circulation fan, and recording the working time; and if the working time is less than the set time, continuously collecting the temperature of the cavity.
Among the above-mentioned technical scheme, because which heating pipe is opened to temperature control generally is preset by the culinary art mode, temperature control process is unstable like this, and the culinary art effect is poor.
Disclosure of Invention
The invention provides a multi-section temperature field control method and system of a steam oven and a storage medium, aiming at solving the problem that the temperature control process of the existing steam oven is unstable.
The technical scheme of the invention is as follows:
on one hand, the invention provides a multi-section temperature field control method of a steam oven, which is based on the steam oven with a plurality of heating pipes arranged inside, and comprises the following steps:
receiving an input PID algorithm comparison table, a cooking temperature value and a preheating target temperature value, wherein the PID algorithm comparison table comprises a corresponding relation among a temperature count, a switch state corresponding to each heating pipe and a temperature compensation value;
detecting a current temperature value;
if the current temperature value is lower than the preheating target temperature value, using 3D baking for preheating, and determining a first temperature count according to the current temperature value, the preheating target temperature value and a PID algorithm;
inquiring the switch state and the temperature compensation value corresponding to each heating pipe corresponding to the first temperature count in a PID algorithm comparison table;
if the current temperature value is greater than or equal to the preheating target temperature value and is less than the cooking temperature value, receiving the set operation time and starting timing;
if the current time is less than the maximum operation time, calculating the slope by subtracting the temperature of the target historical time from the current temperature and dividing the temperature by the time interval between the current temperature and the target historical time, wherein the target historical time is any historical time between the current time and the operation starting time;
starting timing when the calculated slope is within a first slope range, and after the timing reaches a preset time, if the slopes are within the first slope range within the time, closing a first preset number of heating pipes until the current temperature value is greater than or equal to the cooking temperature value, and entering a cooking temperature control mode;
if the slopes are all located outside the first slope range within the preset time, continuing the 3D baking preheating and restarting timing;
if the current time reaches the operation time, entering a cooking temperature control mode;
and if the cooking temperature control mode is entered, determining a second temperature count according to the current temperature value, the cooking temperature value and the PID algorithm, and inquiring the on-off state and the temperature compensation value corresponding to each heating pipe corresponding to the second temperature count in a PID algorithm comparison table.
The invention achieves the following beneficial effects: the method divides the temperature control of the steaming and baking oven into three steps, each step adopts a PID algorithm distribution temperature compensation mode for control, and the adjustment is continuously carried out in the temperature control process, so that the whole temperature control process is divided into a plurality of sections, the whole process is more stable, and the cooking quality is effectively improved. The 3D baking preheating can effectively improve the temperature rising speed and reduce the preheating time. And the control method can adapt to different cooking modes, and is simple to change and strong in plasticity.
Further, evaporate inside stirring fan that still is equipped with of oven, 3D cures and preheats and includes:
and (4) enabling all the heating pipes to enter the working positions, controlling the working states of the heating pipes of all the working positions according to the table look-up result of the PID algorithm comparison table, and starting the stirring fan.
Through above-mentioned scheme, the stirring fan can accelerate the even speed of the inside temperature of steaming and baking oven, reduces the phenomenon that the temperature overshoots, also can improve the programming rate, reduces preheating time.
Further, the number of the heating pipes is four, and the step of controlling the working states of the heating pipes of all the working positions according to the table look-up result of the PID algorithm comparison table comprises the step of starting two heating pipes simultaneously according to the table look-up result of the PID algorithm comparison table.
By the scheme, the general steaming and baking oven only has four heating pipes at the upper part, the bottom part, the back part and the outside part, and only two heating pipes can be started at the same time, so the method only starts two heating pipes at the same time according to a PID algorithm distribution temperature compensation mode.
Further, the step of detecting the current temperature value includes:
detecting a midpoint temperature value and temperature values of a plurality of boundary points in the steaming and baking oven, judging whether the temperature is uniform according to the midpoint temperature value and the temperature values of the plurality of boundary points, if the midpoint temperature value is similar to the temperature values of the plurality of boundary points, determining that the current temperature is uniform, taking the midpoint temperature value as the current temperature value, if the midpoint temperature value is not similar to the temperature values of the plurality of boundary points, not uniformly taking the midpoint temperature value and the average value of the temperature values of the plurality of boundary points as the current temperature.
Through the scheme, the temperature in the steaming oven is determined to be uneven through multipoint temperature detection, and the temperature control is facilitated.
Further, when the current temperature value is greater than or equal to the preset target temperature value and less than the cooking temperature value, the method further comprises the following steps:
and judging whether the current temperature is uniform, and if so, stopping the stirring fan.
Through the scheme, under the condition that the temperature in the steaming and baking box is uniform, the temperature in the steaming and baking box is not required to be stirred by the stirring fan.
Further, the detecting the temperature value of the midpoint inside the steaming oven comprises:
setting a comparison point of the midpoint in the steaming oven, receiving the temperature value of the comparison point and the temperature compensation of the middle part, detecting the temperature value of the comparison point and calculating the midpoint temperature value according to the temperature compensation.
Through the scheme, the temperature in the middle of the steaming oven cannot be directly detected, so that the midpoint temperature value needs to be calculated in a mode of a reference point.
Further, the step of determining the number of thermometers according to the current temperature value, the preheating target temperature value and the PID algorithm comprises:
receiving a preheating target temperature value and a current temperature value;
substituting the integral constant, the preheating target temperature value and the current temperature value into a PID algorithm to obtain a calculation result, and assigning the calculation result to a temperature error;
if the PID algorithm calculation result is greater than 0, judging whether the temperature error accumulated value is greater than a set temperature value or not;
if the temperature error accumulated value is larger than or equal to the set temperature value, the temperature error accumulated value is returned to 0, and the temperature count is added by 1;
searching corresponding temperature step numbers, the switch states and the temperature compensation values corresponding to the heating pipes in a PID algorithm comparison table according to the temperature counts, if the temperature counts are larger than or equal to the temperature step numbers obtained by searching the table, enabling the temperature counts to be 0, and obtaining the switch states and the temperature compensation values corresponding to the heating pipes according to the temperature counts searched in the PID algorithm comparison table to control the heating pipes;
adding the temperature error accumulated value and the temperature error and giving the result to the temperature error accumulated value;
and if the temperature error is 0, controlling the heating pipes with the second preset number not to work.
Through the scheme, the PID algorithm distribution temperature compensation mode can accurately calculate which step in the PID algorithm comparison table should be adopted, and the temperature compensation is accurate.
On the other hand, the invention provides a multi-section temperature field control system of a steam oven, which comprises a steam oven box body and a plurality of heating pipes fixedly connected in the steam oven box body, wherein the steam oven box body is connected with a temperature control system, and the temperature control system comprises a storage module, a mode selection module, a temperature detection module, a temperature comparison module, a first preheating module, a second preheating module and a cooking module;
the storage module receives and stores input information, the storage module stores a PID algorithm comparison table and cooking mode information, and the cooking mode information comprises a plurality of cooking modes, a cooking temperature value, a preheating target temperature value, cooking time and maximum operation time corresponding to each cooking mode;
the mode selection module receives an externally input instruction and calls the corresponding cooking mode information stored by the storage module according to the instruction;
the temperature detection module detects and outputs a current temperature value in the box body of the steaming and baking box;
the temperature comparison module receives the current temperature value and compares the current temperature value with a preset target temperature and a cooking temperature value, when the current temperature value is smaller than the preset target temperature value, a starting signal is transmitted to the first preheating module, and when the current temperature value is larger than or equal to the preset target value and smaller than the cooking temperature value, a starting signal is transmitted to the second preheating module;
the first preheating module receives the starting signal and then controls the heating pipe to carry out 3D baking preheating, and controls the heating pipe in a PID algorithm distribution temperature compensation mode;
the second preheating module starts timing when receiving the starting signal, calculates the slope when the timing is less than the maximum operation time, closes one heating pipe according to a PID algorithm distribution temperature compensation mode if the slope is continuously close to 0 in the set time, transmits the starting signal to the cooking module until the current temperature is more than or equal to the cooking temperature, and continues 3D baking preheating until the timing reaches the maximum operation time and transmits the starting signal to the cooking module if the slope is continuously more than 0 in the set time;
and after receiving the starting signal, the cooking module controls the current temperature to be equal to the cooking temperature value according to a PID algorithm distribution temperature compensation mode.
The invention has the following beneficial effects: the temperature control of the steaming and baking oven is divided into three steps by the system, each step is controlled by adopting a PID algorithm distribution temperature compensation mode, and the adjustment is continuously carried out in the temperature control process, so that the whole temperature control process is divided into multiple sections, the whole process is more stable, and the cooking quality is effectively improved. The 3D baking preheating can effectively improve the temperature rising speed and reduce the preheating time. And the control method can adapt to different cooking modes, and is simple to change and strong in plasticity.
Further, a stirring fan is fixedly connected in the box body of the steaming and baking box;
the first preheating module receives a starting signal and then controls the stirring fan to start;
the temperature detection module judges whether the current temperature is uniform, and if the current temperature is uniform, the second preheating module controls the stirring fan to stop working.
Through above-mentioned scheme, the stirring fan can accelerate the even speed of the inside temperature of steam oven, reduces the phenomenon that the temperature overshoots, also can improve the programming rate, reduces preheating time, under the even condition of temperature in the steam oven, need not stir the temperature in the steam oven of stirring fan.
In another aspect, the present invention provides a storage medium for a multi-stage temperature field control method of a steam oven, including a memory storing a program of the multi-stage temperature field control method of the steam oven and a processor capable of executing the program stored in the memory.
The multi-section temperature field control method, the system and the storage medium of the steam oven have the following advantages:
1. the temperature control of the steaming and baking oven is divided into three steps, each step is controlled by adopting a PID algorithm distribution temperature compensation mode, and the adjustment is continuously carried out in the temperature control process, so that the whole temperature control process is divided into multiple sections, the whole process is more stable, and the cooking quality is effectively improved;
2.3D baking preheating can effectively improve the temperature rising speed and reduce the preheating time;
3. the stirring fan can accelerate the temperature uniformity inside the steaming and baking oven, reduce the temperature overshoot phenomenon, improve the temperature rise speed and reduce the preheating time.
Drawings
FIG. 1 is an overall flow chart of a multi-stage temperature field control method of a steam oven according to the present invention;
FIG. 2 is an overall structure diagram of a multi-stage temperature field control system of a steaming and baking oven according to the present invention;
FIG. 3 is a sectional view of the inside of the box body of the multi-section temperature field control system of the steam oven of the present invention;
FIG. 4 is a block diagram of a temperature control system of a multi-stage temperature field control system of a steam oven according to the present invention.
In the figure, 1, a steaming and baking oven box body; 11. heating a tube; 12. a stirring fan; 2. a temperature control system; 21. a storage module; 22. a mode selection module; 23. a temperature detection module; 231. a temperature sensor; 24. a temperature comparison module; 25. a first preheating module; 26. a second preheating module; 27. a cooking module.
Detailed Description
To facilitate an understanding of the present invention by those skilled in the art, specific embodiments thereof are described below with reference to the accompanying drawings.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; 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 meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The first embodiment of the invention provides a multi-section temperature field control method for a steam oven, as shown in fig. 1, based on the steam oven with four heating pipes 11 inside, a stirring fan 12 is further arranged inside the steam oven, and the specific steps are as follows:
s100, presetting: and receiving an input PID algorithm comparison table, a cooking temperature value and a preheating target temperature value. The PID algorithm look-up table includes a correspondence relationship among a temperature count, a switching state corresponding to each heating pipe 11, and a temperature compensation value. The cooking temperature value and the preheating target temperature value are determined by a user according to a cooking mode, and the steaming oven is determined according to the cooking mode.
S200, temperature detection: detecting a midpoint temperature value in the steaming and baking oven and temperature values of a plurality of boundary points, setting a comparison point of the midpoint in the steaming and baking oven, receiving temperature compensation of the temperature value of the comparison point and a middle temperature value, detecting the temperature value of the comparison point and calculating the midpoint temperature value according to the temperature compensation. And judging whether the temperature is uniform or not according to the midpoint temperature value and the temperature values of the plurality of boundary points. And if the midpoint temperature value is similar to the temperature values of the plurality of boundary points, determining that the current temperature is uniform, and taking the midpoint temperature value as the current temperature value. If the midpoint temperature value is not similar to the temperature values of the plurality of boundary points, the current temperature is not uneven, and the average value of the midpoint temperature value and the temperature values of the plurality of boundary points is used as the current temperature. The temperature in the steaming and baking box is determined to be uneven through multipoint temperature detection, and the temperature control is facilitated.
S300, preheating: and if the current temperature value is lower than the preheating target temperature value, using 3D baking for preheating, and determining a first temperature count according to the current temperature value, the preheating target temperature value and a PID algorithm. In the PID algorithm look-up table, the on-off state and the temperature compensation value corresponding to each heating pipe 11 corresponding to the first temperature count are queried.
The 3D baking preheating comprises the steps of enabling all the heating pipes 11 to enter working positions, controlling the working states of the heating pipes 11 of all the working positions according to the table look-up result of the PID algorithm comparison table, namely simultaneously starting the two heating pipes 11 according to the table look-up result of the PID algorithm comparison table, and starting the stirring fan 12. The stirring fan 12 can accelerate the temperature uniformity inside the steaming and baking oven, reduce the temperature overshoot phenomenon, increase the temperature rise speed and reduce the preheating time.
The specific method for determining the first temperature count is as follows:
s301, receiving a preheating target temperature value and a current temperature value.
S302, substituting the integral constant, the preheating target temperature value and the current temperature value into a PID algorithm to obtain a calculation result, and assigning the calculation result to a temperature error.
And S303, if the PID algorithm calculation result is greater than 0, judging whether the temperature error accumulated value is greater than a set temperature value.
And S304, if the temperature error accumulated value is larger than or equal to the set temperature value, the temperature error accumulated value is returned to 0, and the temperature count is increased by 1.
S305, searching the corresponding temperature step number, the switch state and the temperature compensation value corresponding to each heating pipe 11 in the PID algorithm comparison table according to the temperature count, if the temperature count is larger than or equal to the temperature step number obtained by searching the table, enabling the temperature count to be 0, and obtaining the switch state and the temperature compensation value corresponding to each heating pipe 11 according to the temperature count searched in the PID algorithm comparison table to control the heating pipes 11.
And S306, adding the temperature error accumulated value and the temperature error and giving the result to the temperature error accumulated value.
And S307, if the temperature error is 0, controlling the heating pipes 11 with the second preset number not to work. The second predetermined number is 1 in the present embodiment, and normally controls the post-heating pipe 11 not to be operated.
S400, cooking preheating: and if the current temperature value is greater than or equal to the preheating target temperature value and is less than the cooking temperature value, receiving the set operation time and starting timing. And meanwhile, judging whether the current temperature is uniform, and if so, stopping the stirring fan 12.
S401, if the current time is less than the maximum operation time, the slope is calculated by subtracting the temperature of the target historical time from the current temperature and dividing the temperature by the time interval between the current temperature and the target historical time, wherein the target historical time is any historical time between the current time and the operation starting time.
S402, when the calculated slope is within a first slope range, timing is started, and when the timing reaches a preset time and the slopes are within the first slope range within the time, the heating pipes 11 with a first preset number are closed until the current temperature value is greater than or equal to the cooking temperature value, and then the cooking temperature control mode is started.
And S403, if the slopes are all out of the first slope range within the preset time, continuing the 3D baking preheating and restarting timing.
And S404, if the current time reaches the operation time, entering a cooking temperature control mode.
S500, a cooking mode: if the cooking temperature control mode is entered, a second temperature count is determined according to the current temperature value, the cooking temperature value and the PID algorithm, and the on-off state and the temperature compensation value corresponding to each heating pipe 11 corresponding to the second temperature count are inquired in the PID algorithm comparison table.
The specific method for determining the second temperature count is as follows:
s501, receiving a cooking temperature value and a current temperature value;
and substituting the integral constant, the cooking temperature value and the current temperature value into a PID algorithm to obtain a calculation result, and assigning the calculation result to the temperature error.
S502, if the PID algorithm calculation result is larger than 0, whether the temperature error accumulated value is larger than a set temperature value or not is judged.
And S503, if the temperature error accumulated value is larger than or equal to the set temperature value, the temperature error accumulated value is returned to 0, and the temperature count is added by 1.
S504, searching the corresponding temperature step number, the switch state and the temperature compensation value corresponding to each heating pipe 11 in the PID algorithm comparison table according to the temperature count, if the temperature count is larger than or equal to the temperature step number obtained by searching the table, enabling the temperature count to be 0, and obtaining the switch state and the temperature compensation value corresponding to each heating pipe 11 according to the temperature count searched in the PID algorithm comparison table to control the heating pipes 11.
S505, adding the temperature error accumulated value and the temperature error and giving the result to the temperature error accumulated value;
and S506, if the temperature error is 0, controlling the heating pipes 11 with the third preset number not to work. The third predetermined number is 1 in the present embodiment, and normally controls the post-heating pipe 11 not to be operated.
The use method comprises the following steps: the method divides the temperature control of the steaming and baking oven into three steps, each step adopts a PID algorithm distribution temperature compensation mode for control, and the adjustment is continuously carried out in the temperature control process, so that the whole temperature control process is divided into a plurality of sections, the whole process is more stable, and the cooking quality is effectively improved. The 3D baking preheating can effectively improve the temperature rising speed and reduce the preheating time. And the control method can adapt to different cooking modes, and is simple to change and strong in plasticity.
The second embodiment of the invention provides a multi-section temperature field control system of a steam oven, as shown in fig. 2 and 3, comprising a steam oven body 1 and a plurality of heating pipes 11 fixedly connected in the steam oven body 1, wherein a stirring fan 12 is fixedly connected in the steam oven body 1. The number of the heating pipes 11 is four, and the heating pipes are respectively positioned at the bottom, two sides and the back of the box body 1 of the steaming and baking box.
As shown in fig. 4, the steaming and baking oven body 1 is connected with a temperature control system 2, and the temperature control system 2 includes a storage module 21, a mode selection module 22, a temperature detection module 23, a temperature comparison module 24, a first preheating module 25, a second preheating module 26 and a cooking module 27.
As shown in fig. 4, the storage module 21 receives and stores the input information, the storage module 21 stores a PID algorithm comparison table and cooking mode information, and the cooking mode information includes a plurality of cooking modes, a cooking temperature value corresponding to each cooking mode, a preheating target temperature value, a cooking time, and a maximum operation time.
As shown in fig. 4, the mode selection module 22 receives an externally input command and calls the corresponding cooking mode information stored in the storage module 21 according to the command.
As shown in fig. 3 and 4, the temperature detecting module 23 includes a plurality of temperature sensors 231 fixedly connected inside the steaming and baking oven body 1, and the temperature sensors 231 detect the temperature inside the steaming and baking oven body 1. The temperature detection module 23 selects one temperature sensor 231 as a comparison point of the midpoint, receives temperature compensation of the temperature value of the comparison point and the middle temperature value, detects the temperature value of the comparison point, and calculates the midpoint temperature value according to the temperature compensation. The temperature detection module 23 determines whether the temperature is uniform according to the midpoint temperature value and the temperature values of the plurality of boundary points, determines that the current temperature is uniform if the midpoint temperature value is similar to the temperature values of the plurality of boundary points, and uses the midpoint temperature value as the current temperature value, and does not uniform if the midpoint temperature value is not similar to the temperature values of the plurality of boundary points, and uses the average value of the midpoint temperature value and the temperature values of the plurality of boundary points as the current temperature. The temperature detection module 23 outputs the current temperature value.
As shown in fig. 4, the temperature comparison module 24 receives the current temperature value and compares the current temperature value with a preset target temperature and a cooking temperature value, transmits a start signal to the first preheating module 25 when the current temperature value is less than the preset target temperature value, and transmits a start signal to the second preheating module 26 when the current temperature value is greater than or equal to the preset target value and less than the cooking temperature value.
As shown in fig. 4, the first preheating module 25 receives the start signal and then controls the heating pipe 11 to perform 3D baking preheating, and controls the heating pipe 11 in a PID algorithm distributed temperature compensation manner.
The PID algorithm comprises:
setting an integral constant pid _ par and a temperature T, receiving a target temperature set _ temp and a current temperature real _ temp, wherein heat _ system is a temperature error, hm _ step _ cnt is a temperature error accumulated value, hm _ step is a temperature count, and N _ step is a temperature step number obtained by table lookup;
PID_result＝PID_Calc(pid_par，set_temp，real_temp)；
heat_sycle＝PID_result；
if(PID_result>0)
{
if(hm_step_cnt>＝T)
{
hm_step_cnt＝0；
hm_step++；
if(hm_step>＝N_step)
hm_step＝0；
}
hm_step_cnt+＝heat_sycle；
}
else
{
heat_sycle＝0；
}。
and searching the corresponding switch state and temperature compensation value of each heating pipe 11 in a PID algorithm comparison table according to the temperature count. When heat _ system =0, the heating pipe 11 on the back side is controlled not to be operated.
As shown in fig. 4, the second preheating module 26 starts timing when receiving the start signal, calculates a slope when the timing is less than the maximum operation time, closes one heating pipe 11 according to the PID algorithm distribution temperature compensation method if the slope is continuously close to 0 within the set time until the current temperature is greater than or equal to the cooking temperature, and transmits the start signal to the cooking module 27, and continues to perform 3D baking preheating until the timing reaches the maximum operation time if the slope is continuously greater than 0 within the set time, and transmits the start signal to the cooking module 27.
As shown in fig. 4, after receiving the start signal, the cooking module 27 controls the current temperature to be equal to the cooking temperature value according to a PID algorithm distribution temperature compensation manner.
The use method comprises the following steps: the temperature control of the steam oven is divided into three steps by the system, each step is controlled by adopting a PID algorithm distribution temperature compensation mode, and the whole temperature control process is divided into multiple sections and is more stable as a whole, so that the cooking quality is effectively improved. The 3D baking preheating can effectively improve the temperature rising speed and reduce the preheating time. And the control method can adapt to different cooking modes, and is simple to change and strong in plasticity.
The embodiment three of the invention provides a storage medium of a multi-section temperature field control method of a steaming oven, which comprises a memory and a processor, wherein the memory stores programs of the multi-section temperature field control method of the steaming oven, and the processor can execute the programs stored in the memory.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. The multi-section temperature field control method of the steam oven is based on the steam oven with a plurality of heating pipes (11) arranged inside, and is characterized by comprising the following steps of:
receiving an input PID algorithm comparison table, a cooking temperature value and a preheating target temperature value, wherein the PID algorithm comparison table comprises a corresponding relation among a temperature count, a switch state corresponding to each heating pipe (11) and a temperature compensation value;
detecting a current temperature value;
if the current temperature value is lower than the preheating target temperature value, using 3D baking preheating, and determining a first temperature count according to the current temperature value, the preheating target temperature value and a PID algorithm, wherein the specific method for determining the first temperature count comprises the following steps:
receiving a preheating target temperature value and a current temperature value;
substituting the integral constant, the preheating target temperature value and the current temperature value into a PID algorithm to obtain a calculation result, and assigning the calculation result to a temperature error;
if the PID algorithm calculation result is greater than 0, judging whether the temperature error accumulated value is greater than a set temperature value or not;
if the temperature error accumulated value is larger than or equal to the set temperature value, the temperature error accumulated value is returned to 0, and the temperature count is added by 1;
searching corresponding temperature step numbers, switch states and temperature compensation values corresponding to the heating pipes (11) in a PID algorithm comparison table according to the temperature counts, if the temperature counts are larger than or equal to the temperature step numbers obtained by the table lookup, enabling the temperature counts to be 0, and obtaining the switch states and the temperature compensation values corresponding to the heating pipes (11) according to the temperature counts searched in the PID algorithm comparison table to control the heating pipes (11);
adding the temperature error accumulated value and the temperature error and giving the result to the temperature error accumulated value;
if the temperature error is 0, controlling a second preset number of heating pipes (11) not to work;
inquiring the switch state and the temperature compensation value corresponding to each heating pipe (11) corresponding to the first temperature count in a PID algorithm comparison table;
if the current temperature value is greater than or equal to the preheating target temperature value and is less than the cooking temperature value, receiving the set operation time and starting timing;
if the current time is less than the maximum operation time, calculating the slope by subtracting the temperature of the target historical time from the current temperature and dividing the temperature by the time interval between the current temperature and the target historical time, wherein the target historical time is any historical time between the current time and the operation starting time;
starting timing when the calculated slope is within a first slope range, and after the timing reaches a preset time, if the slopes are within the first slope range within the period of time, closing a first preset number of heating pipes (11) until the current temperature value is greater than or equal to the cooking temperature value, and entering a cooking temperature control mode;
if the slopes are all located outside the first slope range within the preset time, continuing the 3D baking preheating and restarting timing;
if the current time reaches the operation time, entering a cooking temperature control mode;
and if the cooking temperature control mode is entered, determining a second temperature count according to the current temperature value, the cooking temperature value and the PID algorithm, and inquiring the on-off state and the temperature compensation value corresponding to each heating pipe (11) corresponding to the second temperature count in a PID algorithm comparison table.
2. The multi-stage temperature field control method for the steam oven according to claim 1, wherein a stirring fan (12) is further disposed inside the steam oven, and the 3D baking preheating comprises:
and (3) enabling all the heating pipes (11) to enter the working positions, controlling the working states of the heating pipes (11) of all the working positions according to the table look-up result of the PID algorithm comparison table, and starting the stirring fan (12).
3. The multi-section temperature field control method of the steam oven according to claim 2, characterized in that: the number of the heating pipes (11) is four, and the control of the working states of the heating pipes (11) of all working positions according to the PID algorithm look-up table look-up results comprises the simultaneous starting of two heating pipes (11) according to the PID algorithm look-up table look-up results.
4. The multi-section temperature field control method for the steam oven of claim 2, wherein the step of detecting the current temperature value comprises:
detecting a midpoint temperature value and temperature values of a plurality of boundary points in the steaming and baking oven, judging whether the temperature is uniform or not according to the midpoint temperature value and the temperature values of the plurality of boundary points, if the midpoint temperature value is similar to the temperature values of the plurality of boundary points, determining that the current temperature is uniform, taking the midpoint temperature value as the current temperature value, if the midpoint temperature value is not similar to the temperature values of the plurality of boundary points, not uniformly determining the current temperature, and taking the average value of the midpoint temperature value and the temperature values of the plurality of boundary points as the current temperature.
5. The multi-stage temperature field control method for the steam oven according to claim 4, wherein the current temperature value is greater than or equal to a preset target temperature value and is less than a cooking temperature value, and the method further comprises the following steps:
and judging whether the current temperature is uniform, and if so, stopping the stirring fan (12).
6. The multi-stage temperature field control method for the steam oven of claim 4, wherein the detecting the midpoint temperature value inside the steam oven comprises:
setting a comparison point of the midpoint in the steaming oven, receiving the temperature value of the comparison point and the temperature compensation of the middle part, detecting the temperature value of the comparison point and calculating the midpoint temperature value according to the temperature compensation.
7. The utility model provides a steam oven multistage formula temperature field control system, includes steam oven box (1) and a plurality of heating pipes (11) of fixed connection in steam oven box (1), its characterized in that: the box body (1) of the steaming and baking box is connected with a temperature control system (2), and the temperature control system (2) comprises a storage module (21), a mode selection module (22), a temperature detection module (23), a temperature comparison module (24), a first preheating module (25), a second preheating module (26) and a cooking module (27);
the storage module (21) receives and stores the input information, the storage module (21) stores a PID algorithm comparison table and cooking mode information, and the cooking mode information comprises a plurality of cooking modes, a cooking temperature value, a preheating target temperature value, cooking time and maximum operation time corresponding to each cooking mode;
the mode selection module (22) receives an externally input instruction and calls corresponding cooking mode information stored in the storage module (21) according to the instruction;
the temperature detection module (23) detects and outputs the current temperature value in the box body (1) of the steaming and baking oven;
the temperature comparison module (24) receives the current temperature value and compares the current temperature value with a preset target temperature and a cooking temperature value, transmits a starting signal to the first preheating module (25) when the current temperature value is less than the preset target temperature value, and transmits a starting signal to the second preheating module (26) when the current temperature value is greater than or equal to the preset target value and less than the cooking temperature value;
the first preheating module (25) receives the starting signal and then controls the heating pipe (11) to carry out 3D baking preheating, and controls the heating pipe (11) in a PID algorithm distribution temperature compensation mode, wherein the PID algorithm distribution temperature compensation mode is that a first temperature count is determined according to a current temperature value, a preheating target temperature value and a PID algorithm, and the specific method for determining the first temperature count is as follows: receiving a preheating target temperature value and a current temperature value; substituting the integral constant, the preheating target temperature value and the current temperature value into a PID algorithm to obtain a calculation result, and assigning the calculation result to a temperature error; if the PID algorithm calculation result is greater than 0, judging whether the temperature error accumulated value is greater than a set temperature value or not; if the temperature error accumulated value is larger than or equal to the set temperature value, the temperature error accumulated value is returned to 0, and the temperature count is added by 1; searching corresponding temperature step numbers, switch states and temperature compensation values corresponding to the heating pipes (11) in a PID algorithm comparison table according to the temperature counts, if the temperature counts are larger than or equal to the temperature step numbers obtained by the table lookup, enabling the temperature counts to be 0, and obtaining the switch states and the temperature compensation values corresponding to the heating pipes (11) according to the temperature counts searched in the PID algorithm comparison table to control the heating pipes (11); adding the temperature error accumulated value and the temperature error and giving the result to the temperature error accumulated value; if the temperature error is 0, controlling a second preset number of heating pipes (11) not to work;
the second preheating module (26) starts timing when receiving the starting signal, calculates the slope when the timing is less than the maximum operation time, the slope calculation mode is that the slope is obtained by subtracting the temperature of the target historical moment from the current temperature and dividing the temperature by the time of the interval between the current temperature and the target historical moment, the target historical moment is any historical moment between the current time and the operation starting time, if the slope is continuously close to 0 in the set time, a heating pipe (11) is closed according to a PID algorithm distributed temperature compensation mode until the current temperature is greater than or equal to the cooking temperature, the starting signal is transmitted to the cooking module (27), if the slope is continuously greater than 0 in the set time, the 3D baking preheating is continuously carried out until the timing reaches the maximum operation time, and the starting signal is transmitted to the cooking module (27);
and the cooking module (27) controls the current temperature to be equal to the cooking temperature value according to a PID algorithm distribution temperature compensation mode after receiving the starting signal.
8. The multi-section temperature field control system of the steaming oven of claim 7, characterized in that: a stirring fan (12) is fixedly connected in the steaming and baking box body (1);
the first preheating module (25) receives a starting signal and then controls the stirring fan (12) to start;
the temperature detection module (23) judges whether the current temperature is uniform, and if the current temperature is uniform, the second preheating module (26) controls the stirring fan (12) to stop working.
9. A storage medium of a multi-section temperature field control method of a steam oven is characterized in that: comprising a memory storing a program of the multi-stage temperature field control method of a steam oven according to any one of claims 1 to 6 and a processor capable of executing the program stored in the memory.
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| CN114911290A (en) * | 2022-06-30 | 2022-08-16 | 华帝股份有限公司 | Method and device for controlling temperature of steaming and baking oven and computer equipment |
| CN117055652B (en) * | 2023-09-04 | 2024-03-08 | 山东胜星食品科技有限公司 | Intelligent temperature regulation and control method for food processing baking oven based on big data |
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