CN1728019A - Fuzzy control method for ebuillition of heated liquid and controller - Google Patents
Fuzzy control method for ebuillition of heated liquid and controller Download PDFInfo
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- CN1728019A CN1728019A CN 200510036224 CN200510036224A CN1728019A CN 1728019 A CN1728019 A CN 1728019A CN 200510036224 CN200510036224 CN 200510036224 CN 200510036224 A CN200510036224 A CN 200510036224A CN 1728019 A CN1728019 A CN 1728019A
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Abstract
A fuzzy control method of liquid boiling by heating includes using temperature transducer to measure temperature of heated liquid ,using constant power to heat liquid and obtaining initial temperature by said transducer and comparing it with boiling temperature then carrying out heating , calculating temperature rising speed for confirming liquid amount to be heated , determining and controlling the boiling of heated liquid according to fuzzy logic rule based on principle that rising speed of heating temperature is slow down when temperature is near or up to boiling temperature . The controller of the method is also disclosed.
Description
Technical field
The present invention relates to a kind of fuzzy control method and controller of ebuillition of heated liquid, particularly a kind ofly be used to have the fixing liquid of boiling point and be heated to the fuzzy control method of boiling and the controller of design according to the method.
Background technology
The temperature-controlled process of liquid heating is various, some is that requirement is heated to a certain specified temp, and some is that requirement is heated to boiling, all has fixing boiling point under the heated liquid usual condition, for example, the boiling temperature of water and vapourizing temperature theoretical value all are 100 ℃.
In the common electric heating class household electrical appliance, the electrical equipment that is used for the liquid heating mainly contains: electric water-boiling device, electric teapot, electric-heating thermos, coffee pot, rapid electric kettle and electric heater or the like; Wherein main temperature controller has: thermopair temperature controller, thermometal mechanical thermostat, flow of metal disc-type temperature controller and electronic type or micro computer temperature control device or the like.These temperature controllers have obtained a large amount of application on electric heating class household electrical appliance, most liquid heating electric heating electric appliances all requires liquid is heated to boiling and carries out temperature control.In industrial processes, equally also have and liquid need be heated to boiling, and keep a period of time to sterilize and sterilization.
Yet the control accuracy of temperature controller is relevant because of its material itself, electronic devices and components foozle, temperature controller installation site and heat sensitivity etc.; In actual applications, come the boiling temperature of controlling liquid heating with existing temperature controller, heated liquid occurs through regular meeting and also do not reach boiling temperature, temperature controller is action just, carry out temperature control and no longer continue heating, the temperature that is heated liquid is just very near boiling temperature, is heated liquid and is heated to boiling and can not make; Perhaps ought be heated liquid and seethe with excitement, can't temperature control and continue heating, make to be heated liquid and to vaporize in a large number, and waste a large amount of energy.
Summary of the invention
Purpose of the present invention aims to provide a kind of fuzzy control method of ebuillition of heated liquid, reach controller according to this control method design, its principle is: when being heated to boiling according to liquid, the temperature rising speed that is heated liquid is slack-off gradually, until when reaching or during near liquid boiling temperature, the principle that temperature almost no longer changes, by sensor thermometric and sampling, rule according to fuzzy logic, judge whether be heated liquid seethes with excitement, when satisfying when being heated the condition of liquid boiling, control heater stops heating, thereby reaches the purpose that control is heated to liquid boiling.
Press the fuzzy control method of a kind of ebuillition of heated liquid of this purpose design, this method utilizes temperature sensor measurement to be heated the initial temperature of liquid, heats under firm power then, makes this fluid temperature rise to a pre-heating temperature T
y, temperature sensor is in the initial temperature value t that begins most to obtain liquid
0, then with t
0With liquid boiling temperature T
fOr pre-heating temperature T
yAfter comparing, proceed heating again; Be heated the temperature of liquid according to default sampling period measurements of program, the heat temperature raising speed of calculating heating process determines to be heated the amount of liquid indirectly by heat temperature raising speed, and determines to reach pre-heating temperature T according to heat temperature raising speed
yOr fluid temperature reaches T
fHeat time heating time that needs, and continue the periodic sampling of this heating process, the programming rate of heating process relatively then calculates the membership function value of liquid boiling at last, judges by fuzzy rule whether liquid seethes with excitement; T wherein
y=1/k T
f, general k＞1.5.
At first, be heated liquid and temperature sensor is obtained thermal equilibrium, well heater does not heat earlier, and sensor can the sense of reality should be heated the initial temperature of liquid, and obtains an initial temperature value t
0, with foundation as the back fuzzy reasoning.
This method utilizes temperature sensor measurement to be heated the temperature that liquid heats under firm power, with initial temperature value t
0With liquid boiling temperature T
fOr pre-heating temperature T
yCompare, differentiation is the cold conditions heating or the heating again of boiling liquid of liquid.
As the initial temperature t that is heated liquid
0Be lower than pre-heating temperature point T
yThe time, then begin continuous heating, preset the temperature that fixing sampling period measurement is heated liquid according to program, be heated to pre-heating temperature point T
y, and calculate the programming rate of heating process, determine to be heated the amount of liquid indirectly by heat temperature raising speed, and after determining to reach pre-heating temperature point according to the speed of heat temperature raising, continue later heating process and sampling period thereof; At T
yThe process record programming rate of more than heating;
When the fluid temperature that is heated that sensor records is put T at pre-heating temperature
y, T
y=1/k T
fWith can be judged as the temperature T that boiling liquid heats again
fIn the time of between-the ε, can on initial temperature numerical value, be heated to temperature and be less than or equal to T
fThe temperature increment of-ε, and calculate the programming rate of heating process determines to be heated the amount of liquid indirectly by this heat temperature raising speed, and determines sampling period of back heating process, T wherein according to the speed of heat temperature raising
y≤ 1/k T
f, k＞1.5, ε is a less temperature value, ε≤5 ℃.
When recording the initial temperature that is heated liquid, temperature sensor approaches boiling temperature T
fDuring-ε, then decidable is the heating again of boiling liquid, temperature increment of heating rising, the time of record temperature increment, calculate again and be heated to the time of boiling fully, and heating again, the programmed control of heating again according to boiling liquid, when being heated to,, determine a heat time heating time that is heated to boiling again according to programming rate near boiling temperature;
When liquid heats under firm power, can judge by following fuzzy rule:
After starting heating, if temperature sensor records the initial temperature of liquid: t
0＜1/k T
f, then be heated to pre-heating temperature, according to the speed of heating, determine the thermometric sampling period of back continuation heating, at 1/k T
fAbove heating process record programming rate;
After starting heating, if temperature sensor records the initial temperature of liquid: 1/k T
f≤ t
0＜T
f-ε then is heated to temperature and is lower than T
fThe temperature increment value of-ε according to the speed that the liquid heating-up temperature raises, is determined thermometric sampling period of heating later to write down programming rate again;
After starting heating, if temperature sensor records the initial temperature of liquid: T
0＞T
f-ε judges that then liquid is that the liquid that had seethed with excitement heats again, temperature increment of heating rising, and the time of record temperature increment, calculate again and be heated to the time of boiling fully, and heating again;
When liquid is heated under firm power, the opening entry programming rate, if temperature sensor records programming rate according to the sampling period, the membership function μ of the liquid boiling that accumulation is calculated (Δ T, t)＜K, then also not boiling of liquid continues heating; If μ (Δ T, t) 〉=K, judge that then liquid seethes with excitement, control heater stops heating, finishes heating schedule and resets K wherein＜1.
Owing to when liquid heats, be subjected to the influence of environment temperature under firm power, after heated fluid temperature raise, the speed of heat radiation was accelerated gradually, and therefore, programming rate actual in the liquid heating process is slack-off gradually;
If liquid is heated to pre-heating temperature T
y, T wherein
y=1/k T
f, general k＞1.5,
The time set of opening entry programming rate is t
0,
The time set of efficiently sampling is: { t
1, t
2... t
N-1, t
n,
The set of the temperature rise difference that records respectively therewith is { Δ T
1, Δ T
2... Δ T
N-1, Δ T
n,
If the mean value of liquid heat temperature raising speed is Δ T,
According to the method for fuzzy logic, the fundamental function of establishing liquid boiling is χ Δ T (t),
The membership function of liquid boiling be μ (Δ T, t),
Δ T=∑ Δ T then
i/ n (i=1,2 ... n)
χΔT(t)＝ΔT
i/ ΔT
The membership function μ of liquid boiling (Δ T, t)=1-χ Δ T (t)=1-Δ T
i/ Δ T
In liquid heating process, the speed of intensification is more and more slower, during particularly near boiling,
Therefore, Δ T
i＜Δ T is 0＜χ Δ T (t)≤1 wherein
Thereby can draw: 0＜μ (Δ T, t)≤1
If the membership function μ of liquid boiling (Δ T, t)=1, Δ T then
i=0, can think that liquid seethes with excitement fully, when promptly continuing heating, the temperature of liquid no longer raises, and is in the heating vapor state fully.
The application of the present invention on different products, because of different product version, the difference of heating means and temperature-sensitive method, the degree of membership of judging the boiling that is heated liquid can have different numerical value, can design various control circuit according to method of the present invention and realize control to ebuillition of heated liquid, its principal character is as follows:
According to the controller of the ebuillition of heated liquid of control method provided by the invention design, its architectural feature is to include a chip MCU in the control circuit, and MCU is connected respectively with clock circuit with the output control circuit of temperature sampling circuit, well heater respectively.The core component of this control circuit is singlechip chip MCU, and according to the fuzzy rule of chip MCU order set and ebuillition of heated liquid control, the corresponding Control Software of establishment is stored among the ROM of MCU.Select different MCU for use, because of the difference of order set, the appointment codes difference of Control Software, but the control function of its realization is identical.
Description of drawings
Fig. 1 is under the constant heating power, and liquid is heated to the temperature changing curve diagram of boiling.
Fig. 2 is the control circuit schematic diagram of one embodiment of the invention.
Fig. 3 is the control circuit schematic diagram of another embodiment of the present invention.
Fig. 4 is the structural representation that is applicable to temperature sensor of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Referring to Fig. 1, the sampling period of adopting the NTC temperature sensor to determine when preheating among the present invention records the temperature rise that is heated liquid and changes, and judges according to fuzzy rule whether the liquid heating seethes with excitement.Liquid from figure is heated in the thetagram of boiling as can be seen, when liquid is heated near boiling, and the temperature rise in the unit time in sampling period, slower than the temperature rise speed at heating initial stage; When it seethed with excitement fully, temperature rise speed approached zero; As continue heating, and liquid is in vapor state, and temperature no longer raises.Among Fig. 1, T
fBe the temperature of liquid boiling, t
0For being heated the initial temperature of liquid, Ty=1/kT
fFor the pre-heating temperature point, when reaching T
yDuring temperature spot, the speed that opening entry heats up, t
0For reaching the time of pre-heating temperature opening entry programming rate, t
1Be the time in the 1st sampling period ..., t
iIt is the time in the i time sampling period; Δ T
1Be the temperature rise value that the 1st time the sampling period records, just at t
1With t
0The difference of the temperature in this time period ..., Δ T
iIt is the temperature rise value that records in the i time sampling period.
In order to specify this control method, illustrate below.
Under the standard state, the water of a container internal fixation capacity is heated to boiling from room temperature approximately needs 5 minutes, is heated to be firm power, and controller can be realized by the following method at the temperature control and the fuzzy reasoning process of heating process:
At first, for make sensor can the sense of reality initial temperature of Ying Shui, and obtain an initial temperature value, with the foundation as the back fuzzy reasoning, the water temperature in the container should obtain thermal equilibrium with temperature sensor, and well heater is not worked earlier, leave standstill 30-60 second, obtain initial temperature t
0
Initial temperature t when water
0Be lower than pre-heating temperature point T
yIn the time of=50 ℃, then begin continuous heating, according to the default fixing sampling period of program, for example: 10 seconds; Measurement is heated the temperature of water, be heated to 50 ℃ of pre-heating temperature points, and the programming rate of calculating heating process, determine to be heated the capacity of water indirectly by heat temperature raising speed, and after determining to reach pre-heating temperature according to the speed of heat temperature raising, continue the thermometric sampling period of heating process, can be by the empirical data on different product, in the software of MCU, draw with the method for tabling look-up, below be wherein a kind of basis when preheating programming rate and the sampling period reference table of follow-up heating:
| Preheat programming rate | ≤ 2 ℃/10 seconds | ≤ 3 ℃/10 seconds | ≤ 4.5 ℃/10 seconds | ≤ 6 ℃/10 seconds | ≤ 8 ℃/10 seconds | ≤ 11 ℃/10 seconds | ≤ 14 ℃/10 seconds | ≤ 17 ℃/10 seconds | ≤ 20 ℃/10 seconds | ＞20 ℃/10 seconds |
| The follow-up heating sampling time | 12 seconds | 10 seconds | 8 seconds | 7 seconds | 6 seconds | 5 | 4 seconds | 3 | 2 | 1 second |
More than directly provided in the table and preheated the programming rate and the corresponding relation in follow-up heating sampling period.In same container, the programming rate that the different water yields heats under firm power differs greatly, therefore, pine in follow-up adding, should adopt the different sampling periods, whether seethe with excitement so that accurately judge the liquid heating, and make liquid timely temperature control after boiling, reach purpose of energy saving.
When recording the initial temperature that is heated liquid, temperature sensor approaches boiling temperature T
f, for greater than T
fDuring-ε=95 ℃, then decidable is the heating again of boiling liquid, the programmed control of heating again according to boiling liquid, when being heated near 99 ℃ of boiling temperatures, according to programming rate, for example 1 ℃/5 seconds, determine that again be＞5 seconds a fixing heat time heating time, for example heated 10 seconds again;
Be heated fluid temperature 50 ℃ of pre-heating temperature points with can be judged as between 95 ℃ of the temperature that boiling liquid heats again the time when what sensor recorded, can be on initial temperature numerical value, heat a temperature increment to temperature≤95 ℃, optionally be heated to 95 ℃, and the programming rate of calculating heating process, determine to be heated the amount of liquid indirectly by this heat temperature raising speed, and determine sampling period of back heating process according to the speed of heat temperature raising, look-up method is with above identical.
At the follow-up boiling stage that is heated to, judge whether be heated to boiling according to the membership function of water ebuillition of heated, in this example, from reaching 50 ℃ of pre-heating temperatures, the record programming rate, the programming rate that is located at when preheating is 3.5 ℃/10 seconds, and the sampling period that then therefrom checks in follow-up heating is 8 seconds; Time t when reaching 50 ℃
0Beginning is write down programming rate according to 8 seconds sampling period, and the time set of its efficiently sampling is t
i8 seconds, and 16 seconds, 24 seconds ... 8n second },
The corresponding therewith temperature rise difference Δ T that records
iSet be 2.8 ℃/8 seconds, 2.8 ℃/8 seconds, 2.8 ℃/8 seconds ... 2.6 ℃/8 seconds, 2.6 ℃/8 seconds ... 2.5 ℃/8 seconds ... 2.0 ℃/8 seconds, 1.2 ℃/8 seconds, 0.5 ℃/8 seconds, 0.2 ℃/8 seconds };
If Δ T=∑ Δ T
i/ n (i=1,2 ... ℃ n)=2.5/8 seconds
Then judge the membership function μ whether water seethe with excitement (Δ T, t)=1-Δ T
i/ Δ T
＝1-0.2/2.5＝0.92
In this routine MCU software, set: if μ (Δ T, t)＜0.9, then also not boiling of liquid continues heating; If (Δ T t) 〉=0.9, judges that then water seethes with excitement to μ, and control heater stops heating, finishes heating schedule, and buzzer warning prompting water is heated to boiling and finishes.
Therefore, when water heats under firm power, can receive fuzzy judgement rule rule as follows:
Judge whether be heated to boiling according to the membership function of water ebuillition of heated, if μ (Δ T, t)＜0.9, then also not boiling of liquid continues heating; If (Δ T t) 〉=0.9, judges that then water seethes with excitement to μ, and control heater stops heating, finishes heating schedule, and at this moment, buzzer warning prompting water is heated to boiling and finishes.
Therefore, when the water in the container heats under firm power, can receive above fuzzy logic ordination rule as follows:
1. after starting heating, if temperature sensor records the initial temperature of liquid: t
0＜50 ℃, then be heated to 50 ℃ of pre-heating temperatures, according to the programming rate of heating, determine the thermometric sampling period of back continuation heating, at the record of the heating process more than 50 ℃ programming rate;
2. after starting heating, if temperature sensor records the initial temperature of water: 50 ℃＜t
0＜95 ℃, then be heated to 95 ℃ of temperature, according to the speed that the liquid heating-up temperature raises, determine thermometric sampling period of heating later to write down programming rate again;
3. after starting heating, if temperature sensor records the initial temperature of liquid: t
0〉=95 ℃, judge that then liquid is that the liquid that had seethed with excitement heats again, heating is elevated to 99 ℃, the time of record temperature increment, calculate again and be heated to the time of boiling fully, and heating again;
4. water from the opening entry programming rate, records programming rate as if temperature sensor according to the sampling period in heating process, and the membership function μ of the water boiling that accumulation is calculated (Δ T, t)＜0.9, then also boiling of liquid, continuation heating; If (Δ T t) 〉=0.9, judges that then water seethes with excitement to μ, and control heater stops heating, finishes heating schedule.
According to the control method of the invention described above, controller of the present invention adopts Single-chip Controlling, and Fig. 2 and Fig. 3 are two kinds of feasible design proposals.
Referring to Fig. 2, be the control circuit of SCR control ebuillition of heated liquid, the core component of this control circuit is singlechip chip MCU.According to the fuzzy rule of chip MCU order set and ebuillition of heated liquid control, the corresponding Control Software of establishment is stored among the storage ROM of MCU.Select different MCU for use, the appointment codes difference of Control Software, but the control function of its realization is identical.After starting power supply, according to the rule of the temperature variation curve of liquid heating among Fig. 1, sensor NTC records the initial temperature T that is heated liquid
0, with initial temperature T
0After comparing, determine the present heating period of this liquid.Preheating the stage,, determining the sampling period of follow-up heating by pre-warmed programming rate, last, determine according to above-mentioned fuzzy judgement rule whether liquid seethes with excitement.
The peripheral circuit of chip MCU is used for realizing specific control function, and chip MCU is electrically connected respectively with the output control circuit and the clock circuit of display circuit, key circuit, hummer cue circuit, temperature sampling circuit, well heater.Display circuit is used to refer to and starts/stop or heating-up temperature, the state of time; At different products,, also can be reduced to a led state pilot lamp according to the requirement of cost control; Key circuit is the key treatment circuit of band ON/OFF basic function; The triode Q3 on right side on the figure, capacitor C 3, resistance R 9 and R10 and hummer BUZ form the hummer cue circuit jointly, are starting heating, stop or making prompting during ebuillition of heated;
Temperature sampling circuit comprises sensor NTC and triode Q2, resistance R 5, R6, R7 and R8, resistance R 5 one terminations are gone into triode Q2 base stage, and resistance R 6 and R8 one end and triode Q1 collector join, resistance R 7 one ends and triode Q1 emitter join, and its other end and resistance R 8 other ends join.Temperature sampling circuit is used for measuring the initial temperature that is heated liquid, is heated the temperature of liquid according to the sampling period measurement;
The output control circuit of SCR control well heater comprises controllable silicon SCR and triode Q1, resistance R 1, R2 and R3, resistance R 1 and R2 one end and triode Q1 base stage are joined, and resistance R 3 is joined with triode Q1 collector, and resistance R 1 other end and triode Q1 emitter join; Controllable silicon SCR is connected in the circuit of well heater place, and the one termination is gone between resistance R 3 and the R4; According to the output of chip MCU heating with controlling liquid; Heater H EATER is the permanent power heating element of liquid, will be according to the present invention the fuzzy rule of foundation judge whether liquid is in fluidized state, if when not reaching boiling temperature, heat continuously; Clock circuit comprises crystal oscillator CRY and capacitor C 1 and C2, capacitor C 1 and C2 serial connection, crystal oscillator be connected in series afterwards capacitor C 1 and C2 parallel connection; DC power supply circuit can be used transformer step-down, current rectifying and wave filtering circuit, and also available resistance step-down, current rectifying and wave filtering circuit are decided by customer requirement.
Referring to Fig. 3, be the control circuit of relay controlling liquid ebuillition of heated, its basic circuit is identical with Fig. 2, and key circuit is reduced to has only the ON/OFF basic function; Display circuit is reduced to LED light; The output control circuit of relay control heater comprises relay R ELAY, diode D11, resistance R 11 and R12, resistance R 11 and R12 one end and triode Q1 base stage are joined, diode D11 negative pole and triode Q1 collector join, relay is in parallel with diode D11, and well heater place circuit is inserted in its contact.Simplify for the display driver circuit function that makes MCU, cost reduces, and is optional with the less MCU of function.When practical application controller circuitry of the present invention, also can increase thermal cut-off as required, dry combustion method protection temperature limiter, the peripheral circuit of MCU also can be made equivalent transformation.
Referring to Fig. 4, be the temperature sensor NTC sectional structure among the present invention, sensor 1 is arranged on the housing 2 inner tip places of capful structure, and sensor 1 and connection lead 5 outer setting thereof have insulating sleeve 3, are provided with packing layer 4 between insulating sleeve 3 and the housing 2.
The product of making according to the present invention, available fixed installation on electric heating series products such as electric water-boiling device, electric hot water bottle and coffee pot, install with the Elastic Contact formula on the electric heating series products of removable heating containers such as quick insulating pot and electric teapot, structure shown in Figure 4 can be as the temperature control induction installation of removable heating container.
Claims (10)
1. the fuzzy control method of an ebuillition of heated liquid, when it is characterized in that described liquid is heated to boiling, the temperature rising speed that is heated liquid is slack-off gradually, when reaching the boiling temperature of liquid, vaporizing liquid, temperature almost no longer raises, thereby according to the rule of fuzzy logic, controlling liquid is heated to boiling;
This method utilizes temperature sensor measurement to be heated the temperature that liquid heats under firm power, and temperature sensor wherein is in the initial temperature value t that begins most to obtain liquid
0, then with initial temperature value t
0With liquid boiling temperature T
fOr pre-heating temperature T
yCompare, differentiation is the cold conditions heating or the heating again of boiling liquid of liquid;
Be heated the temperature of liquid according to the default sampling period measurement of program, calculate the heat temperature raising speed of heating process, determine to be heated the amount of liquid indirectly by heat temperature raising speed, thereby the thermometric sampling period when determining follow-up the heating, the programming rate that compares heating process then, calculate the membership function value of liquid boiling at last, judge by fuzzy rule whether liquid seethes with excitement.
2. the fuzzy control method of ebuillition of heated liquid according to claim 1, when it is characterized in that described liquid heats under firm power:
As the initial temperature t that is heated liquid
0Be lower than pre-heating temperature point T
yThe time, then begin continuous heating, preset the temperature that fixing sampling period measurement is heated liquid according to program, be heated to pre-heating temperature point T
y, and calculate the programming rate of heating process, determine to be heated the amount of liquid indirectly by heat temperature raising speed, and after determining to reach pre-heating temperature point according to the speed of heat temperature raising, continue later heating process and sampling period thereof; At T
yThe process record programming rate of more than heating;
When the fluid temperature that is heated that sensor records is put T at pre-heating temperature
yWith can be judged as the temperature T that boiling liquid heats again
fIn the time of between-the ε, can on initial temperature numerical value, be heated to temperature and be less than or equal to T
fThe temperature increment of-ε, and calculate the programming rate of heating process determines to be heated the amount of liquid indirectly by this heat temperature raising speed, and determines back heating process and sampling period thereof by the speed of heat temperature raising;
When recording the initial temperature that is heated liquid, temperature sensor approaches boiling temperature T
fDuring-ε, then judge it is the heating again of boiling liquid, temperature increment of heating rising, the time of record temperature increment, calculate again and be heated to the time of boiling fully, and heating again; Control according to the program that boiling liquid heats again, when being heated to,, determine a heat time heating time that is heated to boiling again according to programming rate near boiling temperature.
3. the fuzzy control method of ebuillition of heated liquid according to claim 2, when it is characterized in that described liquid heats under firm power:
Be heated liquid after reaching pre-heating temperature, the opening entry programming rate, if temperature sensor records programming rate according to the sampling period, the membership function μ of the liquid boiling that accumulation is calculated (Δ T, t),
If μ (Δ T, t)＜K, then also not boiling of liquid continues heating;
If μ (Δ T, t) 〉=K, judge that then liquid seethes with excitement, control heater stops heating, and the end heating schedule also resets.
4. the fuzzy control method of ebuillition of heated liquid according to claim 1, when it is characterized in that described liquid heats under firm power,
If liquid is heated to pre-heating temperature T
y, T wherein
y=1/k T
f, k＞1.5
The time set of opening entry liquid programming rate is t
0,
The time set of efficiently sampling is: { t
1, t
2... t
N-1, t
n,
The set that records the temperature rise difference therewith respectively is { Δ T
1, Δ T
2... Δ T
N-1, Δ T
n,
If the mean value of liquid heat temperature raising speed is Δ T,
According to the method for fuzzy logic, the fundamental function of establishing liquid boiling is χ Δ T (t),
The membership function of liquid boiling be μ (Δ T, t),
Δ T=∑ Δ T then
i/ n (i=1,2 ... n)
χΔT(t)＝ΔT
i/ ΔT
The membership function μ of liquid boiling (Δ T, t)=1-χ Δ T (t)=1-Δ T
i/ Δ T
In liquid heating process, the speed of intensification is more and more slower, during particularly near boiling,
Therefore, Δ T
i＜Δ T is 0＜χ Δ T (t)≤1 wherein
Thereby can draw: 0＜μ (Δ T, t)≤1
If the membership function μ of liquid boiling (Δ T, t)=1, Δ T then
i=0, can think that liquid seethes with excitement fully, when promptly continuing heating, the temperature of liquid no longer raises, and is in vapor state.
5. the controller of an ebuillition of heated liquid, comprise well heater, sensor and control circuit, it is characterized in that including in the described control circuit chip MCU, MCU is electrically connected respectively with the output control circuit and the clock circuit of temperature sampling circuit, well heater respectively.
6. the fuzzy controller of ebuillition of heated liquid according to claim 5, the output control circuit that it is characterized in that described well heater is the output control circuit of SCR control well heater or the output control circuit of relay control heater;
The output control circuit of SCR control well heater comprises controllable silicon SCR and triode Q1, resistance R 1, R2 and R3, resistance R 1 and R2 one end and triode Q1 base stage are joined, and resistance R 3 is joined with triode Q1 collector, and resistance R 1 other end and triode Q1 emitter join; Controllable silicon SCR is connected in the circuit of well heater place, and the one termination is gone between resistance R 3 and the R4;
The output control circuit of relay control heater comprises relay R ELAY, diode D11, resistance R 11 and R12, resistance R 11 and R12 one end and triode Q1 base stage are joined, diode D11 negative pole and triode Q1 collector join, relay is in parallel with diode D11, and well heater place circuit is inserted in its contact.
7. the fuzzy controller of ebuillition of heated liquid according to claim 5, it is characterized in that described temperature sampling circuit comprises sensor NTC and triode Q2, resistance R 5, R6, R7 and R8, resistance R 5 one terminations are gone into triode Q2 base stage, resistance R 6 and R8 one end and triode Q1 collector join, resistance R 7 one ends and triode Q1 emitter join, and its other end and resistance R 8 other ends join.
8. the fuzzy controller of ebuillition of heated liquid according to claim 5 is characterized in that described clock circuit comprises crystal oscillator CRY and capacitor C 1 and C2, capacitor C 1 and C2 serial connection, crystal oscillator be connected in series afterwards capacitor C 1 and C2 parallel connection.
9. the fuzzy controller of ebuillition of heated liquid according to claim 5 is characterized in that the chip MCU in the described control circuit also is electrically connected with display circuit, key circuit and hummer cue circuit respectively.
10. the fuzzy controller of ebuillition of heated liquid according to claim 5, it is characterized in that described sensor is arranged on the enclosure interior top end of capful structure, sensor and connection lead outer setting thereof have insulating sleeve, are provided with packing layer between insulating sleeve and the housing.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102450094A (en) * | 2009-06-01 | 2012-05-09 | Bsh博世和西门子家用电器有限公司 | Hob having a temperature sensor |
| CN104199490A (en) * | 2014-08-22 | 2014-12-10 | 深圳市朗特电子有限公司 | One-part type temperature control method and system of relay |
| CN105326386A (en) * | 2015-11-23 | 2016-02-17 | 珠海格力电器股份有限公司 | Water temperature boiling point judging method and device and electric kettle |
| CN105433776A (en) * | 2015-12-25 | 2016-03-30 | 珠海格力电器股份有限公司 | Electric pressure cooker boiling point judging method and electric pressure cooker |
| CN106618183A (en) * | 2016-12-12 | 2017-05-10 | 广州市吉谷电器科技有限公司 | Heating control system and method for electric kettles |
| CN107421126A (en) * | 2016-05-24 | 2017-12-01 | 林增辉 | It is a kind of it is contactless can automatic detection water boiling state heater and control method |
| CN108696955A (en) * | 2017-04-10 | 2018-10-23 | 佛山市顺德区美的电热电器制造有限公司 | For the boilers from drying burning judgment method of electric cooking pot, device and electric cooking pot |
| CN110250889A (en) * | 2019-03-26 | 2019-09-20 | 佛山市云米电器科技有限公司 | A kind of health-promotion kettle calibrates the method and system of boiling point automatically |
| CN110507183A (en) * | 2019-08-27 | 2019-11-29 | 九阳股份有限公司 | A kind of dry combustion method guard method, cooking apparatus and the storage medium of cooking apparatus |
| CN111743384A (en) * | 2019-03-29 | 2020-10-09 | 德国福维克控股公司 | Multipurpose kitchen machine with boiling point identification |
-
2005
- 2005-07-26 CN CNB2005100362249A patent/CN100541359C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8530798B2 (en) | 2009-06-01 | 2013-09-10 | Bsh Bosch Und Siemens Hausgeraete Gmbh | Hob having a temperature sensor |
| CN102450094A (en) * | 2009-06-01 | 2012-05-09 | Bsh博世和西门子家用电器有限公司 | Hob having a temperature sensor |
| CN104199490A (en) * | 2014-08-22 | 2014-12-10 | 深圳市朗特电子有限公司 | One-part type temperature control method and system of relay |
| CN104199490B (en) * | 2014-08-22 | 2016-06-22 | 深圳市朗特电子有限公司 | The one-part form temperature-controlled process of a kind of relay and system thereof |
| CN105326386B (en) * | 2015-11-23 | 2017-12-01 | 珠海格力电器股份有限公司 | Water temperature boiling point determination methods and device and electric kettle |
| CN105326386A (en) * | 2015-11-23 | 2016-02-17 | 珠海格力电器股份有限公司 | Water temperature boiling point judging method and device and electric kettle |
| CN105433776A (en) * | 2015-12-25 | 2016-03-30 | 珠海格力电器股份有限公司 | Electric pressure cooker boiling point judging method and electric pressure cooker |
| CN107421126A (en) * | 2016-05-24 | 2017-12-01 | 林增辉 | It is a kind of it is contactless can automatic detection water boiling state heater and control method |
| CN106618183A (en) * | 2016-12-12 | 2017-05-10 | 广州市吉谷电器科技有限公司 | Heating control system and method for electric kettles |
| CN108696955A (en) * | 2017-04-10 | 2018-10-23 | 佛山市顺德区美的电热电器制造有限公司 | For the boilers from drying burning judgment method of electric cooking pot, device and electric cooking pot |
| CN108696955B (en) * | 2017-04-10 | 2021-10-26 | 佛山市顺德区美的电热电器制造有限公司 | Pot dry-cooking judgment method and device for electric cooker and electric cooker |
| CN110250889A (en) * | 2019-03-26 | 2019-09-20 | 佛山市云米电器科技有限公司 | A kind of health-promotion kettle calibrates the method and system of boiling point automatically |
| CN110250889B (en) * | 2019-03-26 | 2021-03-05 | 佛山市云米电器科技有限公司 | Method and system for automatically calibrating boiling point of health preserving kettle |
| CN111743384A (en) * | 2019-03-29 | 2020-10-09 | 德国福维克控股公司 | Multipurpose kitchen machine with boiling point identification |
| CN110507183A (en) * | 2019-08-27 | 2019-11-29 | 九阳股份有限公司 | A kind of dry combustion method guard method, cooking apparatus and the storage medium of cooking apparatus |
| CN110507183B (en) * | 2019-08-27 | 2021-04-09 | 九阳股份有限公司 | Dry burning protection method for cooking appliance, cooking appliance and storage medium |
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|---|---|
| CN100541359C (en) | 2009-09-16 |
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