CN1089419C - Method for controlling a microwave oven, microwave oven and its use for cooking or heating food in accordance with the method - Google Patents

Abstract

A method for controlling a microwave oven, a microwave oven and its use for automatic cooking or heating of food are disclosed. Food-category information, which is based on the type of food and its initial state, is supplied to the oven for the selection of a corresponding preprogrammed control program. The control program is divided into time periods, during which the microwave radiation source of the oven, a microwave-activable crisp plate (4) and a grill element, if any, are activated at power levels determined by the program. The implementation of the program is monitored by one or more sensors for sensing humidity emission or other substance emission from the food and/or the temperature of the food.

Description

The microwave oven of the method for controlled microwave stove and this method of use

The present invention relates to that but bottom heater that a kind of control utilizes microwave radiation source in the microwave oven and microwave wave excitation heats or the method for the process of cooking food, this bottom heater has the form in order to vessel, dish or the carrier of placing food, and this microwave radiation source and bottom heater are the discrete food heating sources that can control by the control unit of microwave oven.The invention still further relates to the microwave oven of this method of enforcement, and this microwave oven is by the application of the automatic step of controlling to different types of cooking food or heating.

Microwave radiation source produces a kind of microwave with relevant feeding of microwaves system and distributes in furnace chamber, realize the so-called body heating to food.

Microwave oven can comprise one can microwave excited, so-called embrittlement dish (crisp plate) or additional heating source form, that heat food is used of brownization dish (browningplate).The embrittlement dish can be made of a kind of aluminium sheet with little thermal mass (thermal mass) and good thermal conductivity, provides one deck microwave absorbing layer at its downside, and SE patent specification 9003104-8 discloses a kind of like this embrittlement dish.Brownization dish has bigger thermal mass, and it can be made of ceramic disk that is provided with the microwave absorbing layer or glass plate.When usually, embrittlement dish and brownization dish being arranged in the heating or the cooking is rotating.

Microwave oven can also have other the so-called grating element (grill element) or the heating source of infrared radiating element form of equivalence, and this heating source is arranged in the top board of furnace chamber (referring to SE patent specification 9201786-2).

The microwave oven of equipping these three types of thermals source is to adopt a body heater, a bottom heater and a top heater basically, under the situation of this microwave oven, control the thermal radiation of two kinds of heaters from the front by regulating the microwave of supplying with furnace chamber, then a kind of heater is directly controlled by actuation duration and performance number.For the food to a kind of specified type carries out the best heating or the cooking, three kinds of heating sources must use by suitable mode, that is, encourage by the cooking or the heating steps duration that are fit to the performance number of being regulated.Yet problem is, is significant change to the actuation duration and the performance number of variety classes food, and concerning common user, this situation is too complicated.So, usually when working by this way, do not need the user to remove the control cooking or heating steps, the scheme of being taked is to make the structure that only has a kind of power equalization between the different heat sources of microwave oven, and this power equalization is determined by manufacturing firm.

Patent document EP-A-0066637 discloses and a kind ofly provides the method for energy to microwave generation device and infrared heater, and wherein the operating time of every kind of radiation component changes automatically according to cook cycle.

In some country, the power of the equipment of be connected with single phase poaer supply (Single-Phase Connection) is restricted, and this just means that microwave radiation source can not be energized with grating element in the identical time.Thereby this just to using thermal source to propose specific (special) requirements according to food type, makes troubles to the user.

So, the object of the present invention is to provide a kind of microwave oven, there is not above-mentioned any shortcoming in it, can make thermal source obtain favourable utilization, is more suitable for user's use simultaneously.Because the optimum utilization to thermal source makes microwave oven become more useful, can be used to cook or heat now and adorn food with the food or the dish of traditional heating furnace heating, for example can reach the purpose that can not lose the fragility of food.

According to the present invention, can utilize the method for being introduced above belonging to type and that have following feature to reach above-mentioned goal of the invention, the method is characterized in that may further comprise the steps:

1. microwave oven is provided the information of relevant food classification;

2. select the cooking or heating schedule according to the food classification information that is provided, be divided into one or more time cycles;

3. in each time cycle, encourage described two kinds of different heating sources by performance number according to selected program;

4. in each time cycle, one or more detected parameters that the transducer of the one or more detection food situations of foundation obtains and the parameter information of being determined by the food classification calculate a control variables;

5. after beginning this program, the maximum period of time value that each time cycle is determined by the food classification is decremented to zero;

6. be decremented to zero or the calculated value of control variables when surpassing the value of determining by the food classification in the time cycle, stopped each time cycle; With

7. stop this program when having moved in all time cycles.

According to the operation of the very convenient microwave oven of method of the present invention,, for example only need utilize the control panel of microwave oven to import this information because the user only need import the information of relevant food classification.Afterwards, microwave oven can automatically be started working, or utilizes a startup button starting of operation microwave oven.Then, can select a suitable procedure to microwave oven according to the classification of food, and automatically monitor the cooking and heating steps.

At this, information according to food classification or food classification is meant: corresponding to the food to special classification, for example potato product, Piza (pizza) cake and chicken, and the state of food when putting into stove, rough for example fresh, that freeze deeply, the situations such as half finished product of freezing are deeply come the program of the specialized designs cooking or heating.The food classification information can for example be indicated the digital value of food species or state by input, and provides the food classification information by first value of input indication food species and second value of indication food state.Best, be exclusively used in the control knob of food classification or handle food type and the special-purpose button of initial condition is imported the food classification information by manipulation.

Comprise according to microwave oven of the present invention: a furnace chamber, a microwave radiation source that is used for to furnace chamber feed-in microwave, one with vessel, dish or supporting body form can microwave excited bottom heater in order to what place desire heating or cooking food, a control unit that is used to control this bottom heater and is fed to the microwave of furnace chamber, and one or morely be used to detect one or more indication food status detection parameters and send it transducer of control unit to, it is characterized in that, have the device that is used for providing relevant food classification information, and the microprocessor of this control unit programmed so that can carry out following function to control unit:

1. according to the food classification information that is provided, select the cooking or heating schedule, be divided into one or more time cycles;

2. by according to the performance number of selected program excitation microwave radiation source, thereby and the excitation bottom heater;

3. according to the parameter value that obtains from described one or more transducers and by the definite one or more relevant constant of food classification, in each time cycle, carry out calculating to control variables;

4. after start program, the maximum period of time value that each time cycle is determined by the food classification is decremented to zero;

5. be decreased to zero or the calculated value of control variables when surpassing the value of determining by the food classification in each time cycle, stop each time cycle;

6. when having moved in all time cycles, stop this program.

In a preferred embodiment of the invention, microwave oven has a top heater, and it for example is an interior grating element of top board that is arranged on furnace chamber, and it is by selected programme controlled.

The design of microwave oven of the present invention is based on a kind of like this opinion, promptly, general user adopts cooking in microwave oven mostly or heats various foods (for example heating dish or the bread and the potato product of the easy cooking of freezing deeply), and can it can be divided into multiple food classification according to the classification of food and its initial condition.In addition, also find in the stove in modern times, to obtain the optimum utilization of various thermals source, that is, microwave field, bottom in the furnace chamber are added the optimum utilization of thermal embrittlement dish and top heater grid element.This utilization can improve the result of the cooking, and might make microwave oven be used for widely food or dish dress food, and keeps and improve the ease of use of microwave oven to the user.

A kind of application according to microwave oven of the present invention, this microwave oven comprises: be placed in the interior rotation embrittlement dish of stove, be placed in the grating element in the furnace chamber top board and be used to detect the material that is exhaled by food and the transducer of indicating the temperature value of food state, the method is characterized in that:, come food is carried out automatic-cooking or heating according to heating or cooking program selected by the classification information of the kind of food and initial condition thereof and that offer the pre-programmed of this microwave oven.

Preferably, the nonrestrictive embodiment of the invention is described in detail with reference to the accompanying drawings.Wherein,

Fig. 1 shows microwave oven of the present invention, and it is opened wide.

Fig. 2 shows the calcspar of each function associated unit of the microwave oven when implementing the inventive method.

The pre-programmed cooking that Fig. 3 shows that the microprocessor that is used for control unit controls or the flow chart of heating schedule.

The microwave oven of representing among Fig. 1 has the fire door 2 that 1, one on a shell is used to close furnace chamber 3, is provided with an embrittlement dish 4 in furnace chamber.Embrittlement dish 4 is to be made by the aluminium sheet of little thermal mass, its downside has one deck to contain the ferrite microwave absorbing layer of rubber, preferably the Ferrite Material that is adopted has such Curie point, stop from microwave, to absorb energy at this above-mentioned layer of this Curie point, this means, with the temperature stabilization of the contacted embrittlement dish of food upside in 130-230 ℃ scope.The embrittlement dish is suitable for rotating when the cooking or heating process.The designed model of SE patent specification 9003104-8 and applicant is to have provided a kind of easy embrittlement dish structure and its rotating mechanism in the microwave oven of VIP20 and VIP27.

The energy regenerative mouth (not shown) of microwave by one or more microwave radiation sources 20 (being generally a magnetron) that are connected to the stove (see figure 2) through waveguide is by feed-in furnace chamber 3.In illustrated stove, magnetron, relevant Wave guide system, be used to operate the power cell 19 of this magnetron and the back that control unit 15 is set at control panel 5.In the embodiment of a preferred feeding of microwaves system, use a microwave feed-in mouth top and a bottom, these feed-in mouths are arranged on the right side wall of furnace chamber, and the remainder of energy regenerative system is designed to present the microwave of polarization by these openings.The more details of relevant feeding of microwaves system configuration can be referring to SE patent specification 9003012-3 and the applicant's who mentioned in front microwave oven.

The mode that a grating element (not shown) for example adopts SE patent specification 9201786-2 to describe is arranged in the top board of furnace chamber.Grating element can be a kind of so-called " grating pipe " (grill tube), a kind of quartz ampoule or a kind of halogen radiation source.Concrete design conditions can be the microwave oven of VIP20 referring to the model of applicant's design.

A display 6 is arranged on the control board 5, it is by control unit 15 control (see figure 2)s, also expression is used for symbol or simple word information, the remaining cooking or the heating time of selected program thereon, promptly confirms the selection that the user has been done by control panel and other relevant information of how to cook or to heat is provided.

Control knob 7 is used to select to the situation of furnace chamber feed-in microwave to heat, and button 8 is used to encourage the grating element of stove, puts fixed desired time by knob 9.These basic function options have the place with the conventional microwave oven equivalence, and augmented function selecting item of the present invention, promptly select, utilize the interaction of direct-drive microwave, embrittlement dish and grating element simultaneously by the cooking or the heating schedule of the pre-programmed of the some of the food that is used for specialized types.For example only relating under the situation about heating with the direct-drive microwave, available a kind of common rotating chassis replaces rotating embrittlement dish 4.

Button 10 and 11 is respectively applied for beginning and stops the work of microwave oven.Key group 12 is used to import the food classification information, selects the cooking or the heating schedule of a pre-programmed thus.For example these key buttons from the top end of to can relate to pizza, the sweet cake that heating is frozen deeply, the potato product (for example potato chips) that heating is frozen deeply and each position of heating the chicken of freezing deeply that heating is frozen deeply.When operating some buttons, import complete food classification information simultaneously, promptly about the information of food type and its initial condition (for example freezing deeply).In the embodiment of an improved microwave oven, each button is divided into two groups, imports the information of relevant food type by one group of button, is imported the information of relevant food initial condition by another group button.In the simplest this microwave oven embodiment, only use a food classification, this means, only need a key button.All key buttons and knob all link to each other with control unit 15 with display.

At the upside of stove, provide with top board that is arranged on furnace chamber 3 and shell 1 between the steam vent 13 that is connected of the exhaust passage (not shown) of furnace chamber in space.A humidity sensor and a temperature sensor are set in the emptying passage, are used to detect the humidity and the temperature of air-out, and they have direct relation with respect to the food state of cooking in the furnace chamber.Usually, humidity sensor can be a transducer (referring to SE patent specification 9201314-2) that can detect the material that exhales from food, moisture, gas etc.Selecting transducer and they are placed in the exhaust passage is not easy problem, and this paper does not make detailed detailed description to this.

In view of being powers with single phase poaer supply, microwave oven has the mains cord 14 of band plug.

The calcspar of Fig. 2 is represented control unit 15 and a microprocessor and its relevant program storage 16.By square 17, user's information is input to control unit, above-mentioned control knob and the knob of this square representative.Control unit control display 6.Control unit 15 is via a driver 18 and microwave power unit 19 controlled microwave radiation sources 20, thereby controlled microwave is to the feed-in of furnace chamber 3.Control unit 15 is via a driver 21 control grating elements 22, thus the infrared radiation of control feed-in furnace chamber 3.From this furnace chamber, information is sent to control unit 15 by the humidity of air-out in the exhaust passage of detecting furnace chamber respectively and the humidity sensor 23 and the temperature sensor 24 of temperature.So the cooking or the control of heating steps realizes by complete feedback procedure, so that the cooking or heating steps are reduced with respect to the susceptibility of the variation of food early-products, initial temperature and supply voltage.The more details of relevant these functional unit structures can be referring to above-mentioned patent and the microwave oven of being made by the applicant.

At Fig. 3, show the cooking of a pre-programmed or the flow chart of heating schedule, it comprises three period of time T 1, T2, T3 in succession, there is a maximum duration of being determined by the food classification in each cycle.When carrying out in each cycle, microwave present and thus the excitation of embrittlement dish and grating element all by being undertaken by the determined performance number of food classification.In the relevant cycle, the performance number that is respectively applied for microwave and grating element is represented as PM1, PM2, PM3 and PG1, PG2, PG3.In each cycle, according to the information that obtains from humidity sensor and temperature sensor, control variables C is calculated continuously by following formula.

In time T 1,

C=a1 humidity increase+b1 temperature;

In time T 2,

C=a2 humidity increase+b2 temperature;

In time T 3,

C=a3 humidity increase+b3 temperature.Wherein, a1, a2, a3 and b1, b2, b3 are the constants of being determined by the food classification.

In each cycle, cycle time, value was decremented to zero gradually.Reduced to zero in this time, or surpassed a c1 who determines by the food classification respectively in this control variables, c2, during the c3 value, this cycle is terminated, and the beginning next cycle.When period T 3 had been moved, this program was terminated.

The performance number PM1 of each food classification, PM2, PM3 and PG1, PG2, PG3 give optimization respectively, and in a further rapid microwave oven of developing, each performance number can change in the time cycle.Parameter a, b, the c of each food classification of equally, all correspondences are given optimization.The microwave power that is provided can distribute between different feeding of microwaves mouths, so that energy distributes between the inner heating of the food that heat the bottom and microwave provides that the embrittlement dish provides.This distribution can utilize the microwave feed system described in the SE patent specification 9302302-6 to realize.

The indicated program of flow chart shown in Figure 3 has following operating procedure, and wherein y represents " yes " (being), and N represents " no " (denying):

S1 begins

S2 puts the T1 that fixes time, T2, T3 by the food classification.

The S3 microwave power is PM1, and the power that grid has is PG1, the time

Decrement is T1.

S4 T1=0? if T1=0 proceeds to S6;

If T1 ≠ 0 proceeds to S5.

Does S5 calculate C, C 〉=CI?

If not, be back to S3;

If proceed to S6.

The S6 microwave power is PM2, and the power that grid has is PG2, the time

Decrement is T2.

S7 T2=0? if T2=0 proceeds to S9;

If T2 ≠ 0 proceeds to S8.

Does S8 calculate c, c 〉=c2?

If proceed to S9;

If not, be back to S6.

The S9 microwave power is PM3, and the power that grid has is PG3,

The time decrement is T3.

S10 T3=0? if T3=0 proceeds to S12;

If T3 ≠ 0 proceeds to S11.

Does S11 calculate c, c 〉=c3?

If proceed to S12;

If not, be back to S9.

12 programs stop.

Be provided with when providing the situation of device of relevant food weight information to control unit 15 at microwave oven, step S13 relates to a kind of further control program of rapid development.For example, this can carry out by arranging the knob 9 among Fig. 1, makes it when utilizing automatic control program of the present invention, also plays as the effect of putting the device of deciding food weight.Perhaps, microwave oven can be close to therein and rotate embrittlement Pan Chu weight sensor 25 (see figure 2)s, for example design of being introduced among the SE patent specification 9300291-3 are set.

According to weight information w, the duration T 1e of the expection of each time cycle in the microprocessor calculation procedure, T2e, T3e is as follows:

T1e＝k1·w

T2e＝k2·w

T3e＝k3·w

Wherein, k1, k2, k3 are the constants that depends on the food classification.

The temperature that can also utilize the furnace chamber air-out detects the initial temperature of air-out as detected parameters, and the corrected value of gained is introduced in the described parameter information.

Can also programme to the microprocessor 16 of control unit 15,, and adjust this program according to resulting temperature value so that obtain the temperature value of air-out when beginning in the cooking or heating schedule from temperature sensor.

Provide the device 12 of food classification information to comprise: provide first of food type parameter to install and provide second device of the state parameter of food, the combination of these parameters is corresponding to the cooking or the heating schedule that are stored in the control unit.

Microwave oven of the present invention is provided with a rotation embrittlement dish 4 of being manufactured by the metal of little thermal mass and good thermal conductivity, be provided with one deck microwave absorbing layer at its downside, a grating element is arranged in the top board of furnace chamber, microwave oven is equiped with a microwave energy-feeding system, its feed-in mouth is positioned on the level identical with embrittlement dish 4 and is applicable to the microwave of presenting polarization to described microwave absorbing layer, the microwave of the polarization that is provided vertically or horizontal vector be oriented in basically in the plane of described layer.

Need to understand, those those skilled in the art can further develop described program in the scope of the invention fully suddenly, for example, when beginning this program, the temperature of air-out can be detected, and used parameter information can be proofreaied and correct according to the temperature of sensor when this program of enforcement.So the user can eliminate any influence to the microwave oven that heats in when beginning.Other improved possibility will be to introduce a kind of temperature sensor that is used to detect embrittlement dish temperature, and use the temperature that is detected to remove controlled microwave radiation source and grating element.When this method of enforcement, can use so-called fuzzy logic to judge.Thus derivative any change all be contemplated as falling with in the scope of appended claim.

Claims (17)

1. control the method for cooking or heating the process of food in the microwave oven for one kind, the microwave radiation source (20) by utilizing stove and cook or heat with can microwave excited bottom heater (4) controlling of a kind of vessel, dish or carrier form of placing food wherein, this radiation source and bottom heater is characterized in that comprising the following steps: as being worked by the discrete food heating source that the control unit (15) of microwave oven is controlled

Microwave oven is provided the information of relevant food classification;

The Information Selection cooking or heating schedule according to the food classification that is provided are divided into one or more period of time T 1, T2

In each time cycle, encourage described two kinds of different heating sources by performance number according to selected program;

In each time cycle, one or more detected parameters that the transducer of the one or more detection food situations of foundation obtains and the parameter information of being determined by the food classification calculate a control variables c;

After beginning this program, the maximum of the time cycle that each time cycle is determined by the food classification is decremented to zero;

The calculated value that has been decremented to zero or control variables in the time cycle surpasses the value c1 that is determined by the food classification, c2 ... the time, stop each time cycle; With

Stop this program when having moved in all time cycles.

2. method as claimed in claim 1, it is characterized in that described microwave oven also comprises a top heater, it as an additional controllable thermal source, encourages described top heater according to selected program with the form of the electric infrared radiating element of a kind of grating element or some other equivalence.

3. method as claimed in claim 1, wherein said program is divided into period of time T 1, T2, Tn, in each time cycle, one or more detected parameters x1, x2, xk is detected, it is characterized in that, in each time cycle, each detected parameters is selected a relevant constant a1, a2 ... an; B1, b2 ... bn; K1 ... kn; As described parameter information.

4. method as claimed in claim 3 is characterized in that, in period of time T n, carries out the calculating of control variables c by following formula:

c＝an·x1+bn·x2+…+kn·xk

5. method as claimed in claim 4, wherein said program comprise two period of time T 1, T2, and two parameter sensing x1 in this two cycles, x2 is carried out detection, it is characterized in that, is calculated as follows this control variables c:

C=a1x1+b1x2 (in period of time T 1);

C=a2x2+b2x2 (in period of time T 2).

6. method as claimed in claim 1 is characterized in that, utilizes the humidity recruitment of air-out in the microwave oven and temperature as detected parameters.

7. method as claimed in claim 1, the temperature of wherein utilizing the furnace chamber air-out is characterized in that as detected parameters, detect the initial temperature of air-out, and the corrected value of gained is introduced in the described parameter information.

8. method as claimed in claim 1, wherein said microwave oven also comprises the device that is used to import or detect food weight, it is characterized in that, by means of control unit, according to the information of the weight w of relevant food and the constant k i that determines by the food classification, be calculated as follows the time T ie of expection of each period of time T i of the cooking or heating schedule:

Tie=kiw wherein, i=1,2,3,

Tie is the time of the expection of time cycle,

Ki is the constant of being determined by the food classification,

W is the weight of food; And

Utilize the Time Calculation value of the expection in the time cycle that the cooking or heating process are added monitoring.

9. microwave oven, comprise a furnace chamber (3), one is used for the microwave radiation source (20) in the microwave feed-in furnace chamber, one to place the vessel for the cooking or heat food on it, the dish or the form of carrier can microwave excited bottom heater (4), one is used to control bottom heater and to the control unit (15) of the feeding of microwaves of furnace chamber, and one or more transducers (23 that are used to detect one or more indication food status detection parameters and provide it to control unit, 24), it is characterized in that, has the device (12) that is used for control unit is provided the classification information of relevant food, and, the microprocessor (16) of control unit is programmed so that can carry out following function:

According to the food classification information that is provided, select the cooking or heating schedule, be divided into one or more period of time T 1, T2,

By according to the performance number of selection procedure excitation microwave radiation source, thereby and the excitation bottom heater;

According to the parameter value that obtains from described one or more transducers and by the definite one or more relevant constant of food classification, in each time cycle, carry out calculating to control variables c;

After start program, the maximum period of time value that each time cycle is determined by the food classification is decremented to zero;

The calculated value that is decremented to zero or control variables in each time cycle surpasses the value c1 that is determined by the food classification, c2 ... the time, stop each time cycle;

When having been moved, stop this program in all time cycles.

10. microwave oven as claimed in claim 9, it is characterized in that being provided with the exhaust passage that is used for the furnace chamber exhaust, a temperature sensor (24) and a humidity sensor (23) are separately positioned in the exhaust passage, as detected parameters, these transducers remain on operating state always in the whole cooking or heating process with the temperature and humidity that detects air-out.

11. microwave oven as claim 10, it is characterized in that the microprocessor (16) of control unit (15) is programmed, so that obtain the temperature value of air-out when beginning, and adjust this program according to resulting temperature value in the cooking or heating schedule from temperature sensor.

12. microwave oven as claimed in claim 9 is characterized in that being used to provide the device (12) of food classification information to be applicable to the parameter that relevant stove interior placement type of food and state are provided, this parameter is corresponding to the cooking or a heating schedule that is stored in the control unit.

13 microwave ovens as claimed in claim 9, it is characterized in that providing the device (12) of food classification information to comprise: provide first of food type parameter to install and provide second device of the state parameter of food, the combination of these parameters is corresponding to the cooking or the heating schedule that are stored in the control unit.

14. microwave oven as claimed in claim 9 is characterized in that being provided with a control panel (5) that has display (6), this display (6) is suitable for expressing mark, symbol or the simple word information of the selected cooking of indication or heating schedule.

15. microwave oven as claimed in claim 9, it is characterized in that being provided with a top heater with the infrared radiating element form of the electricity of grating element or some other equivalence, this top heater according to actuation duration and heats option program, is controlled top heater by control unit (15) control.

16. microwave oven as claim 15, it is characterized in that being provided with a rotation embrittlement dish (4) of manufacturing by the metal of little thermal mass and good thermal conductivity, be provided with one deck microwave absorbing layer at its downside, a grating element is arranged in the top board of furnace chamber, microwave oven is equiped with a microwave energy-feeding system, its feed-in mouth is positioned on the level identical with embrittlement dish (4) and is applicable to the microwave of presenting polarization to described microwave absorbing layer, and the vertical or horizontal vector of the microwave of the polarization that is provided is oriented in the plane of described layer basically.

17. microwave oven as claimed in claim 9, it is characterized in that control unit (15) is applicable to utilizes food weight w as an additional Control Parameter, the information of this food weight is provided by weight sensor (25) or the device (9) that is used for the input weight measured value, this weight sensor is near vessel, dish or carrier (4) are provided with, this control unit is according to the weight of food and the constant k of being determined by the food classification 1, k2, calculate selected procedure time period T 1e, T2e, expeced time, be calculated as follows the time T ie of the expection of the cooking or each period of time T i of heating schedule:

Tie=kiw wherein, i=1,2,3,

Tie is the time of the expection of time cycle,

Ki is the constant of being determined by the food classification,

W is the weight of food; And

Utilize the Time Calculation value of the expection in the time cycle that the cooking or heating process are added monitoring.

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