CN100514048C - Detection method for boiling state of food in cooking pot and detection device therefor - Google Patents
Detection method for boiling state of food in cooking pot and detection device therefor Download PDFInfo
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- CN100514048C CN100514048C CNB2006100356793A CN200610035679A CN100514048C CN 100514048 C CN100514048 C CN 100514048C CN B2006100356793 A CNB2006100356793 A CN B2006100356793A CN 200610035679 A CN200610035679 A CN 200610035679A CN 100514048 C CN100514048 C CN 100514048C
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- 238000009835 boiling Methods 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 238000010411 cooking Methods 0.000 title description 15
- 235000013305 food Nutrition 0.000 title description 2
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 238000007600 charging Methods 0.000 claims description 28
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005485 electric heating Methods 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
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Abstract
The disclosed detection method for boiling in an electric boiler comprises: (1) obtaining boiler temperature and variation rate; (2) comparing the rate with pre-set value; (3) if the variation less than pre-set value for a space, deciding it is boiling. Wherein, the detection device comprises: a thermistor as temperature sensor, a MPU, a capacitor and its charge/discharge circuit and level detection circuit all connected to the MPU. This invention is free to height above sea level, and benefit to obtain ideal cook effect.
Description
Technical field
The present invention relates to the electric heating cooking vessel, specifically, relate to the detection method that article seethe with excitement in the pot in the electric heating cooking vessel, and the pick-up unit that uses this detection method.
Background technology
When existing electric heating cooking vessel (comprising electric food warmer, electromagnetic oven, electric kettle etc.) is used to cook (as to boil water, congee, soup etc.), whether article seethe with excitement and adopt the method for detection temperature of boiler usually in the judgement pot, when detecting temperature of boiler and reach a certain setting value (usually this be worth be boiling point), judge that then article have been in fluidized state in the pot.There is the inaccurate shortcoming of detection in this method, particularly owing to area at different altitude height, glassware for drinking water has different boiling points, so electric heating cooking vessel that is suitable in a certain area, when use in another different area of sea level elevation, often owing to not judging accurately that a pot interior article fluidized state is difficult to obtain the desirable effect of cooking, must regulate the electric heating cooking vessel according to the boiling point of this area's water before perhaps using, can obtain the desirable effect of cooking, make that like this applicability of electric heating cooking vessel is relatively poor, use inconvenient.
Summary of the invention
The purpose of this invention is to provide the detection method that article seethe with excitement in the pot in a kind of electric heating cooking vessel, and the pick-up unit that uses this detection method, make electric heating cooking vessel applicability good, easy to use, and can obtain the desirable effect of cooking.The technical scheme that adopts is as follows:
The general plotting of the detection method of article boiling is in the pot of the present invention: (1) obtains the temperature of pot body, and the accounting temperature rate of change; (2) rate of temperature change and preset value are compared, judge that whether rate of temperature change is less than preset value; (3), then judge article boiling in the pot if rate of temperature change is continuously less than preset value in a period of time; Otherwise forwarding step (1) to continues to detect.
Can temperature sensor and microprocessor be set in the electric heating cooking vessel, be provided with the number of comparisons reservoir in the microprocessor, more specifically, above-mentioned detection method may further comprise the steps: (1) microprocessor is with the value zero clearing of number of comparisons reservoir located therein; (2) temperature sensor detects the temperature of pot body, and sends detected temperature value to microprocessor; (3) microprocessor is according to detected temperature value accounting temperature rate of change, and rate of temperature change and preset value are compared; (4) when rate of temperature change during less than preset value, microprocessor adds one with the value of number of comparisons reservoir; When rate of temperature change during greater than preset value, microprocessor is with the value zero clearing of number of comparisons reservoir; (5) if the value of number of comparisons reservoir less than the number of comparisons preset value, then forwards step (2) to; If the value of number of comparisons reservoir equals the number of comparisons preset value, then article boiling in the microprocessor judges pot.
Because when article seethe with excitement in the pot, temperature of boiler remains on a constant relatively numerical value, its rate of temperature change is less, therefore (time length is corresponding to the number of comparisons preset value in a period of time when rate of temperature change, can set according to actual conditions) during all less than a certain value (being above-mentioned preset value), can judge a pot interior article boiling.Temperature of boiler rate of change in the time of can calculating pot interior article boiling by experiment, reference when determining above-mentioned preset value.
After the article boiling, send signal and give control circuit in the microprocessor judges pot, can cut off heating power supply, perhaps time-delay is cut off heating power supply after heating a period of time.
The pick-up unit of article boiling comprises temperature sensor and microprocessor in a kind of pot, and it is characterized in that: described temperature sensor is a thermistor; Described pick-up unit also comprises an electric capacity, and the charging circuit of this electric capacity, discharge circuit and level sensitive circuit, and charging circuit, discharge circuit and level sensitive circuit are connected with the respective end of microprocessor, and thermistor is connected in the charging circuit; Be provided with in the microprocessor number of comparisons reservoir, this measured value reservoir and last time the measured value reservoir; Be provided with a program in the microprocessor, this program may further comprise the steps: (1) initialization: to comparing the number of times reservoir, this measured value reservoir and measured value reservoir zero clearing last time, (2) each time interval, low level output terminal output low level is to capacitor discharge, level to electric capacity is zero volt, (3) high level output terminal output high level charges to electric capacity, the level detection end is monitored the level on the electric capacity simultaneously, microprocessor calculates electric capacity and charges to the high level required time from zero volt, and this time value stored in this measured value reservoir, (4) with the value of this measured value reservoir and last time the measured value reservoir value relatively and calculate its difference, if difference is less than preset value, then the value with the number of comparisons reservoir adds one, if difference is greater than preset value, then with the zero clearing of number of comparisons reservoir, (5) if the value of number of comparisons reservoir less than the number of comparisons preset value, then copy to the value of this measured value reservoir in measured value reservoir last time and forward step (2) to, if the value of number of comparisons reservoir equals the number of comparisons preset value, then judge article boiling in the pot.
First end of above-mentioned electric capacity connects an end of power cathode, second end connection thermistor (or by thermistor and the series connection of other resistance and/or resistor group that constitutes in parallel), electric capacity and thermistor (or resistor group) constitute charging circuit, and the other end of thermistor (or resistor group) connects the high level output terminal of microprocessor; Second end of above-mentioned electric capacity also connects an end of a resistance, and electric capacity and this resistance constitute discharge circuit, and the other end of resistance connects the low level output terminal of microprocessor; Second end of above-mentioned electric capacity also connects an end of a resistance, and electric capacity and this resistance constitute level sensitive circuit, and the other end of resistance connects the level detection end of microprocessor.
Capacitor charging time (electric capacity charges to the high level required time from zero volt) is corresponding with the resistance of thermistor, the resistance of thermistor then changes with variation of temperature, make thermistor be close to a pot body, then the temperature of thermistor is determined by temperature of boiler, in sum, capacitor charging time is corresponding with temperature of boiler.Because the time interval of measuring this measured value (this duration of charging) and measuring between measured value last time (duration of charging last time) is fixed, therefore this measured value storage with last time measured value difference corresponding to the rate of change of measured value, also promptly corresponding to rate of temperature change.
Preferably in above-mentioned each time interval, electric capacity is carried out multiple discharge, charging, measure a plurality of capacitor charging time values, and calculate the mean value of these capacitor charging time values, value as this measured value reservoir, can detect the temperature of pot body so more exactly, thereby detect the rate of temperature change of pot body more exactly.
Above-mentioned low level output terminal and level detection end can be the same pins of microprocessor, and discharge circuit and level sensitive circuit are same circuit.
The present invention can accurately detect the fluidized state of article in taking the dish out of the pot by the temperature and the accounting temperature rate of change of detection pot body, and is not subjected to the restriction of different altitude height, makes electric heating cooking vessel applicability good, easy to use, and can obtain the desirable effect of cooking.
Description of drawings
Fig. 1 is the circuit theory diagrams of pick-up unit in the preferred embodiment of the present invention 1;
Fig. 2 is the process flow diagram of the program that is provided with in the microprocessor among Fig. 1.
Embodiment
The detection method of article boiling may further comprise the steps in this pot: (1) microprocessor is with the value zero clearing of number of comparisons reservoir; (2) temperature sensor detects the temperature of pot body, and sends detected temperature value to microprocessor; (3) microprocessor is according to detected temperature value accounting temperature rate of change, and rate of temperature change and preset value are compared; (4) when rate of temperature change during less than preset value, microprocessor adds one with the value of number of comparisons reservoir; When rate of temperature change during greater than preset value, microprocessor is with the value zero clearing of number of comparisons reservoir; (5) if the value of number of comparisons reservoir less than the number of comparisons preset value, then forwards step (2) to; If the value of number of comparisons reservoir equals the number of comparisons preset value, then article boiling in the microprocessor judges pot.
After the article boiling, send signal and give control circuit in the microprocessor judges pot, can cut off heating power supply, perhaps time-delay is cut off heating power supply after heating a period of time.
Above-mentioned preset value can be calculated by experiment.
As shown in Figure 1, the pick-up unit of article boiling comprises temperature sensor and microprocessor in this pot, and wherein temperature sensor is thermistor Rt, and microprocessor adopts HT48R05A-1; This pick-up unit also comprises a capacitor C 7, first end of capacitor C 7 connects an end of power cathode, second end connection resistor group (resistor group is made of thermistor Rt and resistance R 8 series connection), electric capacity and resistor group constitute charging circuit, and the other end of resistor group connects the high level output terminal PA3 of microprocessor; Second end of electric capacity also connects an end of resistance R 9, electric capacity and this resistance constitute discharge circuit and level sensitive circuit, the other end of resistance R 9 connects the low level output and the level detection end PA2 (low level output terminal and level detection end are the same pin PA2 of microprocessor, and discharge circuit and level sensitive circuit are same circuit) of microprocessor.The duration of charging of capacitor C 7 (electric capacity charges to the high level required time from zero volt) is corresponding with the resistance of thermistor Rt, the resistance of thermistor Rt then changes with variation of temperature, thermistor Rt is close to a pot body in the present embodiment, the temperature of thermistor Rt is determined by temperature of boiler, in sum, the duration of charging of capacitor C 7 is corresponding with temperature of boiler.Thermistor Rt adopts negative tempperature coefficient thermistor (NTC thermistor) in the present embodiment, and the resistance of thermistor Rt raises along with temperature and reduces, and therefore when temperature raise, the duration of charging of capacitor C 7 shortened.
Be provided with in the microprocessor number of comparisons reservoir, this measured value reservoir and last time the measured value reservoir.
Be provided with a program in the microprocessor, as shown in Figure 2, this program may further comprise the steps:
(1) initialization: to relatively number of times reservoir, this measured value reservoir and measured value reservoir zero clearing last time; The number of comparisons reservoir adopts the number of comparisons register, this measured value reservoir and last time the measured value reservoir adopt respectively this measured value totalizer and last time the measured value totalizer;
(2) low level output and level detection end PA2 output low level are to capacitor C 7 discharges (2 milliseconds), and the level to capacitor C 7 is zero volt;
(3) high level output terminal PA3 output high level is to capacitor C 7 chargings, low level output simultaneously and level detection end PA2 monitor the level on the capacitor C 7, microprocessor calculates capacitor C 7 and charges to the high level required time from zero volt, and this time value is joined in this measured value totalizer; Delayed time then 1 second;
(4) accumulative total delay value is when delay value during second, forwards step (2) less than l0 to; When delay value during more than or equal to 10 seconds, this measured value totalizer to be averaged, this mean value is as the value of this measured value totalizer;
(5) value of the value of this measured value totalizer and measured value totalizer last time relatively as if the value of this measured value totalizer value less than measured value totalizer last time, then forwards step (6) to; If the value of this measured value totalizer is greater than the value of measured value totalizer last time,, the value of this measured value totalizer copied in measured value totalizer last time, and forward step (2) to then with the zero clearing of number of comparisons register;
(6) calculate this measured value totalizer value and last time the measured value totalizer the difference of value, if difference is less than preset value (preset value is 30H, 16 systems), then the value with the number of comparisons register adds one; If difference is greater than preset value,, the value of this measured value totalizer copied in measured value totalizer last time, and forward step (2) to then with the zero clearing of number of comparisons register;
(7) if the value of number of comparisons register is less than number of comparisons preset value (the number of comparisons preset value is 4), then the value with this measured value totalizer copies in measured value totalizer last time, and forwards step (2) to; If the value of number of comparisons register equals the number of comparisons preset value, then judge article boiling in the pot.
Above-mentioned steps (5) is the step that present embodiment increases, and is used for judging that the pot body heats up or cooling.
The time interval of obtaining the value (this duration of charging) of this measured value totalizer and obtaining between the value (duration of charging last time) of measured value totalizer last time is (10 seconds) fixed, therefore the value of this measured value totalizer and last time the measured value totalizer value between difference corresponding to the measurement variation rate, also promptly corresponding to rate of temperature change.
In each time interval, capacitor C 7 is carried out multiple discharge, charging, measure a plurality of capacitor charging time values, and calculate the mean value of these capacitor charging time values, value as this measured value totalizer, can detect the temperature of pot body so more exactly, thereby detect the rate of temperature change of pot body more exactly.
Above-mentioned discharge time, delay value, preset value, number of comparisons preset value etc. can adjust according to actual conditions.
In other embodiments, the present invention also can adopt other temperature sensor.
Claims (6)
1, the detection method of article boiling in a kind of pot, it is characterized in that may further comprise the steps: (1) microprocessor is with the value zero clearing of number of comparisons reservoir located therein; (2) temperature sensor detects the temperature of pot body, and sends detected temperature value to microprocessor; (3) microprocessor is according to detected temperature value accounting temperature rate of change, and rate of temperature change and preset value are compared; (4) when rate of temperature change during less than preset value, microprocessor adds one with the value of number of comparisons reservoir; When rate of temperature change during greater than preset value, microprocessor is with the value zero clearing of number of comparisons reservoir; (5) if the value of number of comparisons reservoir less than the number of comparisons preset value, then forwards step (2) to; If the value of number of comparisons reservoir equals the number of comparisons preset value, then article boiling in the microprocessor judges pot.
2, the pick-up unit of article boiling in a kind of pot comprises temperature sensor and microprocessor, and it is characterized in that: described temperature sensor is a thermistor; Described pick-up unit also comprises an electric capacity, and the charging circuit of this electric capacity, discharge circuit and level sensitive circuit, and charging circuit, discharge circuit and level sensitive circuit are connected with the respective end of microprocessor, and thermistor is connected in the charging circuit; Be provided with in the microprocessor number of comparisons reservoir, this measured value reservoir and last time the measured value reservoir; Be provided with a program in the microprocessor, this program may further comprise the steps: (1) initialization: to comparing the number of times reservoir, this measured value reservoir and measured value reservoir zero clearing last time, (2) each time interval, low level output terminal output low level is to capacitor discharge, level to electric capacity is zero volt, (3) high level output terminal output high level charges to electric capacity, the level detection end is monitored the level on the electric capacity simultaneously, microprocessor calculates electric capacity and charges to the high level required time from zero volt, and this time value stored in this measured value reservoir, (4) with the value of this measured value reservoir and last time the measured value reservoir value relatively and calculate its difference, if difference is less than preset value, then the value with the number of comparisons reservoir adds one, if difference is greater than preset value, then with the zero clearing of number of comparisons reservoir, (5) if the value of number of comparisons reservoir less than the number of comparisons preset value, then copy to the value of this measured value reservoir in measured value reservoir last time and forward step (2) to, if the value of number of comparisons reservoir equals the number of comparisons preset value, then judge article boiling in the pot.
3, the pick-up unit of article boiling in the pot according to claim 2, it is characterized in that: first end of described electric capacity connects that power cathode, second end connect thermistor or by an end of thermistor and series connection of other resistance and/or the resistor group that constitutes in parallel, electric capacity and thermistor or resistor group constitute charging circuit, and the other end of thermistor or resistor group connects the high level output terminal of microprocessor; Second end of described electric capacity also connects an end of a resistance, and electric capacity and this resistance constitute discharge circuit, and the other end of resistance connects the low level output terminal of microprocessor; Second end of described electric capacity also connects an end of a resistance, and electric capacity and this resistance constitute level sensitive circuit, and the other end of resistance connects the level detection end of microprocessor.
4, the pick-up unit of article boiling in the pot according to claim 3, it is characterized in that: described low level output terminal and level detection end are the same pins of microprocessor, and discharge circuit and level sensitive circuit are same circuit.
5, according to the pick-up unit of article boiling in claim 2 or the 3 described pots, it is characterized in that: described thermistor is close to a pot body.
6, the pick-up unit of article boiling in the pot according to claim 2, it is characterized in that: in the described program, in each time interval, electric capacity is carried out multiple discharge, charging, measure a plurality of capacitor charging time values, and calculate the mean value of these capacitor charging time values, as the value of this measured value reservoir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100356793A CN100514048C (en) | 2006-05-23 | 2006-05-23 | Detection method for boiling state of food in cooking pot and detection device therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100356793A CN100514048C (en) | 2006-05-23 | 2006-05-23 | Detection method for boiling state of food in cooking pot and detection device therefor |
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| CN1865957A CN1865957A (en) | 2006-11-22 |
| CN100514048C true CN100514048C (en) | 2009-07-15 |
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| CNB2006100356793A Expired - Fee Related CN100514048C (en) | 2006-05-23 | 2006-05-23 | Detection method for boiling state of food in cooking pot and detection device therefor |
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Owner name: GUANGDONG TONZE ELECTRIC APPLIANCES CO., LTD. Free format text: FORMER NAME: TIANJI ELECTRIC APPHIANCE CO., LTD., GUANGDONG |
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Address after: 515021 Guangdong city of Shantou province Chaoshan road Jinyuan Industrial City area 12-12 Patentee after: GUANGDONG TONZE ELECTRIC Co.,Ltd. Address before: 515021 Guangdong city of Shantou province Chaoshan road Jinyuan Industrial City area 12-12 Patentee before: Guangdong Tonze Electric Co.,Ltd. |
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Effective date of registration: 20220818 Address after: 515000 quality inspection building on the west side of unit C03, nanshanwan Industrial Park, Binhai street, Haojiang District, Shantou City, Guangdong Province Patentee after: Shantou Tianji Electric Appliance Industry Co.,Ltd. Address before: 515021 Guangdong city of Shantou province Chaoshan road Jinyuan Industrial City area 12-12 Patentee before: GUANGDONG TONZE ELECTRIC Co.,Ltd. |
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Granted publication date: 20090715 |