阅读说明：本技术 一种加热烟具校准方法以及系统 (Heating smoking set calibration method and system ) 是由 吉雄 王加深 谢涛 王冲 畅晓渊 吕乔 苏凯 赵超 高安生 于 2021-10-20 设计创作，主要内容包括：本发明公开了一种加热烟具校准方法以及系统,烟具用于在测温时获取采样电阻的压降和发热器件的压降并计算压降比值,从预先存储的温度对照表中查表找到所述压降比值所对应的烟具温度,烟具是通过查表方式直接锁定温度,如此减少计算延迟,提高检测精度,由于温度对照表对查温结果影响很大,为了保证结果的准确性,本发明提出对温度对照表进行校准,如此可以极大地提高测温结果的精度和可靠性；进一步地,本发明还实现了对抽吸容量进行校准。(The invention discloses a heating smoking set calibration method and a system, wherein the smoking set is used for acquiring the voltage drop of a sampling resistor and the voltage drop of a heating device during temperature measurement and calculating the voltage drop ratio, the smoking set temperature corresponding to the voltage drop ratio is found by looking up a table from a prestored temperature comparison table, and the smoking set directly locks the temperature in a table look-up mode, so that the calculation delay is reduced, and the detection precision is improved; further, the invention also realizes the calibration of the suction capacity.)

1. A heating smoking set calibration method is characterized in that the smoking set is used for obtaining the voltage drop of a sampling resistor and the voltage drop of a heating device during temperature measurement and calculating the voltage drop ratio, and the smoking set temperature corresponding to the voltage drop ratio is found by looking up a table from a prestored temperature comparison table, the method comprises the temperature measurement calibration step, and the temperature measurement calibration step comprises the following steps:

the control device determines a plurality of temperature values within the range of the working temperature of the smoking set by taking a fixed temperature gradient as an interval;

sequentially taking each temperature value as a designated temperature to execute temperature calibration operation to obtain a pressure drop ratio corresponding to each temperature value;

and forming a temperature comparison table by using the obtained temperature values and the corresponding pressure drop ratios thereof, and storing the temperature comparison table into the smoking set.

2. The method of claim 1, wherein the temperature calibration operation comprises:

starting an infrared thermal imaging thermometer to acquire thermal image data of the smoking set in real time;

carrying out image processing on thermal image data acquired in real time and then determining the temperature value of the smoking set;

controlling the smoking set to be heated according to the temperature value measured in real time until the temperature value measured in real time reaches the specified temperature;

and when the temperature value measured in real time is stabilized at the designated temperature, informing the smoking set to report the voltage drop ratio of the heating device and the sampling resistor measured in real time.

3. The method according to claim 1, wherein when the smoking set is in operation, when the detected smoking set temperature drops to exceed a preset temperature difference and the duration time exceeds a preset value in a preset time length range, one puff is determined to occur, the maximum value of the change of the pressure drop ratio measured by each puff is searched in the smoking capacity comparison table to find the smoking capacity corresponding to the current puff, and the temperature control parameter of the smoking set is optimized according to the number of puffs, the smoking duration time, the smoking interval time and the smoking capacity value;

the method further comprises a suction volume calibration step comprising:

the smoking set is connected into a suction channel of a smoking machine, and the control device starts the smoking set;

changing the smoking capacity of the smoking machine in a fixed capacity gradient in a preset smoking capacity range, and executing the following steps to obtain the corresponding relation between each smoking capacity and the change maximum value of the pressure drop ratio: after the smoking set is heated to a preset temperature and kept stable, the pressure drop ratio measured in real time is sent to the control device, and after the temperature of the smoking set is stabilized, the control device starts the smoking machine to finish one-time smoking according to preset smoking parameters, wherein the smoking parameters comprise smoking capacity, flow peak type and smoking duration; within the smoking time of the smoking machine for completing one opening, the smoking set sends the measured pressure drop ratio to the control device in real time, and the control device records the maximum change value of the pressure drop ratio and the current smoking capacity of the corresponding smoking machine;

the control device forms a suction capacity comparison table by the corresponding relation of the suction capacities and the maximum value of the pressure drop ratio and writes the suction capacity comparison table into a readable storage unit of the smoking set.

4. A heating smoking set calibration method is characterized in that the smoking set is used for obtaining the voltage drop of a sampling resistor and the voltage drop of a heating device during temperature measurement and calculating the voltage drop ratio, and the smoking set temperature corresponding to the voltage drop ratio is found by looking up a table from a prestored temperature comparison table, the method comprises the temperature measurement calibration step, and the temperature measurement calibration step comprises the following steps:

the control device selects a plurality of temperature values within the range of the working temperature of the smoking set, and sequentially takes each temperature value as the designated temperature to execute temperature calibration operation to obtain the pressure drop ratio corresponding to each temperature value;

calculating the resistance value of the heating device corresponding to each temperature value based on a calculation formula RL = R1V 1/VL according to the voltage drop ratio corresponding to each temperature value, wherein V1/VL represents the voltage drop ratio, and R1 represents the resistance value of the sampling resistor;

obtaining a fitting equation of the resistance value of the heating device and the temperature value in the working temperature range of the smoking set according to the resistance value of the heating device corresponding to each temperature value;

determining a plurality of temperature values within the range of the working temperature of the smoking set by taking a fixed temperature gradient as an interval, and calculating the resistance value of the heating device corresponding to each temperature value according to the fitting equation;

calculating to obtain a voltage drop ratio value corresponding to each temperature value based on a calculation formula V1/VL = RL/R1 according to the resistance value of the sampling resistor and the resistance value of the heating device corresponding to each temperature value;

and forming a temperature comparison table by using the obtained temperature values and the corresponding pressure drop ratios thereof, and storing the temperature comparison table into the smoking set.

5. The method of claim 4, wherein the temperature calibration operation comprises:

starting an infrared thermal imaging thermometer to acquire thermal image data of the smoking set in real time;

carrying out image processing on thermal image data acquired in real time and then determining the temperature value of the smoking set;

controlling the smoking set to be heated according to the temperature value measured in real time until the temperature value measured in real time reaches the specified temperature;

and when the temperature value measured in real time is stabilized at the designated temperature, informing the smoking set to report the voltage drop ratio of the heating device and the sampling resistor measured in real time.

6. The method according to claim 4, wherein obtaining a fitting equation of the resistance value of the heating device and the temperature value in the range of the operating temperature of the smoking set according to the resistance value of the heating device corresponding to each temperature value comprises:

sorting according to the size of the temperature values, and calculating the data of any two adjacent temperature values once according to a TCR definition formula to obtain a TCR average value: TCR (average) = (RL (T2) -RL (T1))/(RL (T2) × (T2-T1)), wherein T1 and T2 represent two adjacent temperature values;

and (4) removing the minimum value and the maximum value in all the obtained TCR average values, and averaging the rest TCR average values to obtain the TCR value.

7. The method according to claim 4, wherein calculating the resistance value of the heat generating device corresponding to each temperature value according to the fitting equation comprises: the resistance value of the heating device corresponding to a certain temperature value in all temperature values is determined through calculation or an experimental mode, and then the resistance value of the heating device corresponding to each temperature value is calculated by utilizing the certain temperature value and the resistance value of the heating device corresponding to the certain temperature value, the TCR value and the TCR definition formula.

8. The method according to claim 4, wherein when the smoking set is in operation, when the detected smoking set temperature drops to exceed a preset temperature difference and the duration time exceeds a preset value in a preset time length range, one puff is determined to occur, the maximum value of the change of the pressure drop ratio measured by each puff is searched in the smoking capacity comparison table to find the smoking capacity corresponding to the current puff, and the temperature control parameter of the smoking set is optimized according to the number of puffs, the smoking duration time, the smoking interval time and the smoking capacity value;

the method further comprises a suction volume calibration step comprising:

the smoking set is connected into a suction channel of a smoking machine, and the control device starts the smoking set;

changing the smoking capacity of the smoking machine in a fixed capacity gradient in a preset smoking capacity range, and executing the following steps to obtain the corresponding relation between each smoking capacity and the change maximum value of the pressure drop ratio: after the smoking set is heated to a preset temperature and kept stable, the pressure drop ratio measured in real time is sent to the control device, and after the temperature of the smoking set is stabilized, the control device starts the smoking machine to finish one-time smoking according to preset smoking parameters, wherein the smoking parameters comprise smoking capacity, flow peak type and smoking duration; within the smoking time of the smoking machine for completing one opening, the smoking set sends the measured pressure drop ratio to the control device in real time, and the control device records the maximum change value of the pressure drop ratio and the current smoking capacity of the corresponding smoking machine;

the control device forms a suction capacity comparison table by the corresponding relation of the suction capacities and the maximum value of the pressure drop ratio and writes the suction capacity comparison table into a readable storage unit of the smoking set.

9. A heated smoking article calibration system for carrying out the method according to any one of claims 1 to 8, the calibration system comprising a control means and an infra-red thermal imaging thermometer, the smoking article and infra-red thermal imaging thermometer being respectively in communicative connection with the control means.

10. The system according to claim 9, wherein the system further comprises a smoking machine, the control device is a computer, the smoking machine is connected with the computer through a data line, the infrared thermal imaging thermometer is in USB communication with the computer, and the smoking set is in serial communication with the computer.

Technical Field

The invention relates to the technical field of tobacco products, in particular to a heating smoking set calibration method and system.

Background

The temperature control of the heated smoking set has a great influence on the smoking experience of the consumer, and the accuracy and stability of the temperature control are the core of smoking set control. In addition, the information of parameters such as the number of the suction openings, the suction duration, the suction interval time, the suction capacity and the like of the user can provide the related parameter information for the accurate control of the smoking set.

The current temperature control strategy for heating smoking set is to detect the resistance value change of the heating element, calculate the temperature of the heating element according to the temperature resistance relation of the heating element, compare the temperature with a set target temperature, and correspondingly adjust the output power of the heating unit through the controller so as to achieve the purpose of temperature regulation and control. The temperature calculation needs to be carried out by complex calculation, and because the calculation power of the smoking set chip is poor under the cost regulation factor and the calculation process is delayed, the accurate temperature value is difficult to detect in real time, and the detection accuracy can only reach +/-2.5 ℃.

Disclosure of Invention

The present invention is directed to a method and a system for calibrating a heating smoking set, which are provided to overcome the above-mentioned drawbacks of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows:

on one hand, a heating smoking set calibration method is constructed, wherein the smoking set is used for acquiring the voltage drop of a sampling resistor and the voltage drop of a heating device during temperature measurement and calculating the voltage drop ratio, the smoking set temperature corresponding to the voltage drop ratio is found by looking up a table from a prestored temperature comparison table, and the method is used for calibrating the temperature comparison table and comprises the following steps:

the control device determines a plurality of temperature values within the range of the working temperature of the smoking set by taking a fixed temperature gradient as an interval;

sequentially taking each temperature value as a designated temperature to execute temperature calibration operation to obtain a pressure drop ratio corresponding to each temperature value;

and forming a temperature comparison table by using the obtained temperature values and the corresponding pressure drop ratios thereof, and storing the temperature comparison table into the smoking set.

Preferably, the temperature calibration operation comprises:

starting an infrared thermal imaging thermometer to acquire thermal image data of the smoking set in real time;

carrying out image processing on thermal image data acquired in real time and then determining the temperature value of the smoking set;

controlling the smoking set to be heated according to the temperature value measured in real time until the temperature value measured in real time reaches the specified temperature;

and when the temperature value measured in real time is stabilized at the designated temperature, informing the smoking set to report the voltage drop ratio of the heating device and the sampling resistor measured in real time.

When the smoking set works, when the detected temperature of the smoking set is reduced and exceeds a preset temperature difference and the duration time exceeds a certain preset value in a preset time length range, judging that one mouth of smoking occurs, inquiring and finding out the corresponding smoking capacity of the current mouth of smoking in the smoking capacity comparison table according to the maximum value of the change of the pressure drop ratio measured by each mouth of smoking, and optimizing the temperature control parameter of the smoking set according to the number of the smoking mouths, the smoking duration time, the smoking interval time and the smoking capacity value;

the method further comprises a suction volume calibration step comprising:

the smoking set is connected into a suction channel of a smoking machine, and the control device starts the smoking set;

changing the smoking capacity of the smoking machine in a fixed capacity gradient in a preset smoking capacity range, and executing the following steps to obtain the corresponding relation between each smoking capacity and the change maximum value of the pressure drop ratio: after the smoking set is heated to a preset temperature and kept stable, the pressure drop ratio measured in real time is sent to the control device, and after the temperature of the smoking set is stabilized, the control device starts the smoking machine to finish one-time smoking according to preset smoking parameters, wherein the smoking parameters comprise smoking capacity, flow peak type and smoking duration; within the smoking time of the smoking machine for completing one opening, the smoking set sends the measured pressure drop ratio to the control device in real time, and the control device records the maximum change value of the pressure drop ratio and the current smoking capacity of the corresponding smoking machine;

the control device forms a suction capacity comparison table by the corresponding relation of the suction capacities and the maximum value of the pressure drop ratio and writes the suction capacity comparison table into a readable storage unit of the smoking set.

In a second aspect, a heating smoking set calibration method is constructed, the smoking set is used for acquiring the voltage drop of a sampling resistor and the voltage drop of a heating device during temperature measurement and calculating a voltage drop ratio, and the smoking set temperature corresponding to the voltage drop ratio is found by looking up a table from a prestored temperature comparison table, the method comprises a temperature measurement calibration step, and the temperature measurement calibration step comprises:

the control device selects a plurality of temperature values within the range of the working temperature of the smoking set, and sequentially takes each temperature value as the designated temperature to execute temperature calibration operation to obtain the pressure drop ratio corresponding to each temperature value;

calculating the resistance value of the heating device corresponding to each temperature value based on a calculation formula RL = R1V 1/VL according to the voltage drop ratio corresponding to each temperature value, wherein V1/VL represents the voltage drop ratio, and R1 represents the resistance value of the sampling resistor;

obtaining a fitting equation of the resistance value of the heating device and the temperature value in the working temperature range of the smoking set according to the resistance value of the heating device corresponding to each temperature value;

determining a plurality of temperature values within the range of the working temperature of the smoking set by taking a fixed temperature gradient as an interval, and calculating the resistance value of the heating device corresponding to each temperature value according to the fitting equation;

calculating to obtain a voltage drop ratio value corresponding to each temperature value based on a calculation formula V1/VL = RL/R1 according to the resistance value of the sampling resistor and the resistance value of the heating device corresponding to each temperature value;

and forming a temperature comparison table by using the obtained temperature values and the corresponding pressure drop ratios thereof, and storing the temperature comparison table into the smoking set.

Preferably, the temperature calibration operation comprises:

starting an infrared thermal imaging thermometer to acquire thermal image data of the smoking set in real time;

carrying out image processing on thermal image data acquired in real time and then determining the temperature value of the smoking set;

controlling the smoking set to be heated according to the temperature value measured in real time until the temperature value measured in real time reaches the specified temperature;

and when the temperature value measured in real time is stabilized at the designated temperature, informing the smoking set to report the voltage drop ratio of the heating device and the sampling resistor measured in real time.

Preferably, the obtaining of the fitting equation of the resistance value of the heating device and the temperature value in the range of the working temperature of the smoking set according to the resistance value of the heating device corresponding to each temperature value includes:

sorting according to the size of the temperature values, and calculating the data of any two adjacent temperature values once according to a TCR definition formula to obtain a TCR average value: TCR (average) = (RL (T2) -RL (T1))/(RL (T2) × (T2-T1)), wherein T1 and T2 represent two adjacent temperature values;

and (4) removing the minimum value and the maximum value in all the obtained TCR average values, and averaging the rest TCR average values to obtain the TCR value.

Preferably, the calculating the resistance value of the heating device corresponding to each temperature value according to the fitting equation includes: the resistance value of the heating device corresponding to a certain temperature value in all temperature values is determined through calculation or an experimental mode, and then the resistance value of the heating device corresponding to each temperature value is calculated by utilizing the certain temperature value and the resistance value of the heating device corresponding to the certain temperature value, the TCR value and the TCR definition formula.

In three respects, a heated smoking article calibration system is constructed for carrying out the method according to any one of claims 1 to 7, the calibration system comprising a control device and an infra-red thermal imaging thermometer, the smoking article and infra-red thermal imaging thermometer being respectively in communicative connection with the control device.

Preferably, the control device is a computer, the infrared thermal imaging thermometer is in USB communication with the computer, and the smoking set is in serial communication with the computer.

The heating smoking set calibration method and the heating smoking set calibration system have the following beneficial effects: in the invention, the smoking set directly locks the temperature in a table look-up mode, so that the calculation delay is reduced, the detection precision is improved, and as the temperature comparison table has great influence on the temperature look-up result, in order to ensure the accuracy of the result, the invention provides the calibration of the temperature comparison table, so that the precision and the reliability of the temperature measurement result can be greatly improved; further, the invention can further calibrate the pumping capacity on the basis of calibrating the temperature.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:

FIG. 1 is a schematic diagram of the circuit structure of the smoking set;

FIG. 2 is a schematic diagram of a heated smoking article calibration system according to the present invention;

FIG. 3 is a flowchart of the thermometric calibration step of the first embodiment;

FIG. 4 is a flowchart of the thermometric calibration step of the second embodiment;

fig. 5 is a flowchart of the suction volume calibration procedure of the third embodiment.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the embodiments and specific features in the embodiments of the present invention are described in detail in the present application, but not limited to the present application, and the features in the embodiments and specific features in the embodiments of the present invention may be combined with each other without conflict.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The terms including ordinal numbers such as "first", "second", and the like used in the present specification may be used to describe various components, but the components are not limited by the terms. These terms are used only for the purpose of distinguishing one constituent element from other constituent elements. For example, a first component may be named a second component, and similarly, a second component may also be named a first component, without departing from the scope of the present invention.

Referring to fig. 1, prior to describing the calibration method of the present invention, the smoking article of the present invention will be described.

The smoking set comprises a control circuit, a time-sharing heating and temperature measuring circuit and a voltage sampling circuit. The control circuit comprises an MCU and a reset key SW, the voltage sampling circuit comprises a sampling resistor R1, two differential operational amplifiers U5 and U6 with 0dB gain (1 time gain), and the sampling resistor R1 is a precision resistor. The time-sharing heating and temperature measuring circuit comprises a heating switch and a temperature measuring switch.

Two input ends of one differential operational amplifier U6 are connected to two ends of the sampling resistor R1, two input ends of the other differential operational amplifier U5 are connected to two ends of a heating device RL of a smoking set, and output ends of the two differential operational amplifiers U5 and U6 are respectively connected to two ADC pins ADC2 and ADC1 of the MCU.

The heating switch is mainly used for controlling the heating of the heating device when receiving the PWM signal, the temperature measurement switch is mainly used for assisting the MCU to realize temperature measurement operation when being conducted, if the heating switch is required to be heated, the heating switch is started, the temperature measurement switch is forbidden, otherwise, if the temperature measurement is required, the temperature measurement switch is started, and the heating switch is forbidden. Specifically, the heating switch and the temperature measurement switch are controlled by the MCU to periodically and alternately work, the MCU alternately enters a heating period and a temperature measurement period when receiving a starting signal (for example, a signal generated by pressing a reset key), sends a PWM signal to the heating switch to work and disconnect the temperature measurement switch in the heating period, and disconnects the heating switch and connects the temperature measurement switch in the temperature measurement period. The MCU executes temperature measurement operation in each temperature measurement period, reduces the duty ratio of the PWM signal of the next heating period when the detected temperature of the smoking set is lower than a set temperature value, increases the duty ratio of the PWM signal of the next heating period when the detected temperature of the smoking set is higher than the set temperature value, and maintains the duty ratio of the PWM signal of the next heating period unchanged when the detected temperature of the smoking set reaches the set temperature value.

Specifically, a first end of the heating device RL is connected to an anode of the heating power supply, specifically, an anode of a 4.2V battery, a second end of the heating device RL is connected to a first end of the sampling resistor R1, a second end of the sampling resistor R1 is connected to a cathode of the heating power supply, specifically, a cathode of the 4.2V battery, via the temperature measurement switch (i.e., U3), and a control end of the U3 is connected to one IO pin of the MCU. The second end of the heating device RL is further connected to the negative electrode of the heating power supply through the heating switch (i.e., U4), the control end of U4 is connected to a PWM pin of the MCU, which outputs a PWM signal, where the control end of U4 is not directly connected to the PWM pin of the MCU, but is connected to the MCU through U2, U2 is a pre-switch of U4, specifically, the control end of U4 is connected to the output end of U2 (i.e., the source of U2), the control end of U4 is further connected to the negative electrode of the heating power supply through a pull-down resistor R2 (R2 is a common carbon film resistor), the input end of U2 is connected to the PWM pin of the MCU, and the control end of U2 and the control end of U3 are connected to the same IO pin of the MCU.

The difference value V1= Va-VL of the voltages at the two ends of the sampling resistor and the difference value VL = Va-V1 of the voltages at the two ends of the heating device are directly obtained through the two differential operational amplifiers, so that one-time subtraction operation is reduced, the differential operational amplifiers can effectively inhibit common-mode voltage interference caused by a power supply, and the sampling precision is greatly improved. Assuming that the TCR of the resistance RL (T1) of the heating wire at room temperature T1 is TCR (T1), according to the formula:

V1/R1=VL/RL(T) （1）；

T=T1+[RL(T)-RL(T1)]/[RL(T1)*TCR(T1)] （2）；

by substituting formula (1) for formula (2), we obtain:

T=T1+[R1*VL/V1-RL(T1)]/[RL(T1)*TCR(T1)] （3）；

in formula (3), RL (T1), TCR (T1), R1 are known, and T is found to be linearly related to VL/V1. However, this formula is very large in calculation amount, for example, assuming that T1 is 25 ℃, TCR (T1) =0.003/° c, R1=1 Ω, RL (T1) =0.7 Ω, and formula (3) is substituted, then:

T=476*(V1/VL)-308 （4）；

the 476 times multiplication operation in the formula (4) operation can generate operation errors, and the requirement on the operation capability of the MCU is higher, so that in order to reduce the calculation amount and the calculation delay of the MCU, the processing speed of the MCU is improved, and the calculation errors are reduced, a temperature comparison table is prestored in the MCU, and a plurality of temperature values increased by fixed temperature gradients and voltage drop ratios VL/V1 of the heating device and the sampling resistor corresponding to each temperature value are recorded in the temperature comparison table. The temperature measurement operation of the MCU comprises the following steps: and acquiring the voltage drop of the sampling resistor and the voltage drop of the heating device, calculating a voltage drop ratio VL/V1, and searching the smoking set temperature corresponding to the voltage drop ratio VL/V1 from a prestored temperature comparison table. For example, in a specific example, the range of the operating temperature of the smoking set is 220 ℃ to 260 ℃, one VL/V1 is recorded at intervals of 1 ℃ (220 ℃, 221 ℃, … … 259 ℃, 260 ℃), see Table 1, and the temperature is accurately controlled by the double difference operational amplifier sampling technology, so that the temperature measurement and control accuracy is improved to be within +/-1 ℃.

TABLE 1 temperature and VL/V1 reference tables

Since the TCR curve of the heat-generating device is mostly non-linear due to the characteristics of the heat-generating device material, the TCR value of the heating element is 3000ppm +/-10 percent in production, and error of +/-10 percent can be introduced by calculating the standard TCR value of 3000ppm, which is one of the sources of temperature measurement error. To reduce such errors, the present invention provides calibrating the temperature map, calibrating the TCR value and the temperature and VL/V1 relationship, correcting the temperature and VL/V1 map and TCR curve with the measured calibration results, and writing the corrected temperature map into a readable memory location of the smoking article. When the smoking set is used, the corrected temperature comparison table is used for feeding back the measured temperature value to the MCU for temperature control, so that the temperature control error is further reduced.

Referring to fig. 2, the calibration system for implementing the heating smoking set calibration method of the present invention includes a control device and an infrared thermal imaging thermometer, and the smoking set and the infrared thermal imaging thermometer are respectively in communication connection with the control device. Specifically, the control device is a desktop computer, the infrared thermal imaging thermometer is in USB communication with the computer, and the smoking set is in serial communication with the computer.

Two embodiments of the heated smoking article calibration method of the present invention are described below.

Example one

Referring to fig. 3, the method of the present embodiment includes a thermometry calibration step, where the thermometry calibration step includes:

s301: the control device determines a plurality of temperature values at intervals of a fixed temperature gradient within a range of the working temperature of the smoking set, specifically, the temperature values are integers, the fixed temperature gradient is 1 ℃, for example, the range of the working temperature of the smoking set is 200-: 200. 201, 202, …, 398, 399, 400 ℃.

S302: sequentially taking each temperature value as a designated temperature to execute temperature calibration operation to obtain a pressure drop ratio corresponding to each temperature value;

s303: and forming a temperature comparison table by using the obtained temperature values and the corresponding pressure drop ratios thereof, and storing the temperature comparison table into the smoking set.

Wherein the temperature calibration operation in S302 includes:

1) starting an infrared thermal imaging thermometer to acquire thermal image data of the smoking set in real time;

2) the method comprises the steps of carrying out image processing on thermal image data collected in real time, then determining the temperature value of the smoking set, specifically, carrying out image processing on the thermal image data collected in real time, then determining an effective temperature measurement area, calculating the average temperature value of the effective temperature measurement area, and taking the calculated average temperature value as the temperature value of the smoking set.

3) Controlling the smoking set to be heated according to the temperature value measured in real time until the temperature value measured in real time reaches the specified temperature;

4) and when the temperature value measured in real time is stabilized at the designated temperature, informing the smoking set to report the voltage drop ratio of the heating device and the sampling resistor measured in real time.

Example two

Referring to fig. 4, the method of this embodiment also includes a temperature measurement calibration step, where the temperature measurement calibration step includes:

s401: the control device selects a plurality of temperature values within the range of the working temperature of the smoking set, and sequentially takes each temperature value as the designated temperature to execute the temperature calibration operation to obtain the pressure drop ratio corresponding to each temperature value. Specifically, the temperature values are integers.

Wherein the temperature calibration operation in S401 includes:

1) starting an infrared thermal imaging thermometer to acquire thermal image data of the smoking set in real time;

2) the method comprises the steps of carrying out image processing on thermal image data collected in real time, then determining the temperature value of the smoking set, specifically, carrying out image processing on the thermal image data collected in real time, then determining an effective temperature measurement area, calculating the average temperature value of the effective temperature measurement area, and taking the calculated average temperature value as the temperature value of the smoking set.

3) Controlling the smoking set to be heated according to the temperature value measured in real time until the temperature value measured in real time reaches the specified temperature;

4) and when the temperature value measured in real time is stabilized at the designated temperature, informing the smoking set to report the voltage drop ratio of the heating device and the sampling resistor measured in real time.

S402: calculating the resistance value of the heating device corresponding to each temperature value based on a calculation formula RL = R1V 1/VL according to the voltage drop ratio corresponding to each temperature value, wherein V1/VL represents the voltage drop ratio, and R1 represents the resistance value of the sampling resistor;

s403: obtaining a fitting equation of the resistance value of the heating device and the temperature value in the working temperature range of the smoking set according to the resistance value of the heating device corresponding to each temperature value;

specifically, the temperature values are sorted according to the size, and the data of any two adjacent temperature values are calculated once according to the TCR definition formula to obtain a TCR average value: TCR (average) = (RL (T2) -RL (T1))/(RL (T2) × (T2-T1)), wherein T1 and T2 represent two adjacent temperature values; then, the minimum value and the maximum value in all the obtained TCR average values are removed, and the rest TCR average values are averaged to obtain the TCR value.

For example, 10 temperature values are selected in total in S401, and the resistance values of 10 heat generating devices corresponding to the 10 temperature values are obtained in step S402. And substituting the 1 st and 2 nd temperature values and the 1 st and 2 nd resistance values of the heating devices into the TCR definition formula to obtain a TCR average value, substituting the 2 nd and 3 nd temperature values and the 2 nd and 3 nd resistance values of the heating devices into the TCR definition formula to obtain a TCR average value, repeating the steps to obtain 9 TCR average values in total, removing the minimum value and the maximum value, and averaging the rest TCR average values to obtain the TCR value.

S404: and determining a plurality of temperature values within the range of the working temperature of the smoking set by taking the fixed temperature gradient as an interval, and calculating the resistance value of the heating device corresponding to each temperature value according to the fitting equation.

Specifically, the temperature values are integers and the fixed temperature gradient is 1 ℃. For example, the range of the operating temperature of the smoking set is 200-: 200. 201, 202, …, 398, 399, 400 ℃.

The calculating of the resistance value of the heating device corresponding to each temperature value according to the fitting equation includes:

1) the resistance value of the heating device corresponding to a certain temperature value in all the temperature values is determined in a calculation or experiment mode.

For example, any one of the designated temperatures in S401 may be selected as a certain temperature value, and the resistance value of the heat generating device at the certain temperature value may be calculated according to the voltage drop ratio of the certain temperature value obtained in S402 and the resistance value of the sampling resistor and according to V1/VL = RL/R1.

For another example, a temperature value may be directly selected, and then the voltage drop ratio corresponding to the temperature value may be obtained through the temperature calibration operation, so as to obtain the resistance value of the heating device at the temperature value.

2) And calculating the resistance value of the heating device corresponding to each temperature value by using the certain temperature value and the resistance value of the heating device corresponding to the certain temperature value, the TCR value and the TCR definition formula.

For example, assuming that the resistance value of the heat generating device at 200 ℃ is obtained in step 1), 200 ℃ is taken as T1, the resistance value of the heat generating device at 200 ℃ is taken as RL (T1) and substituted into the right side of the TCR definition formula, the TCR value obtained in S403 is substituted into the left side of the TCR definition formula, and for each temperature value, it is respectively taken as T2 and substituted into the right side of the TCR definition formula, so that RL (T2) is calculated to be equivalent to the resistance value of the heat generating device corresponding to each temperature value.

S405: calculating to obtain a voltage drop ratio value corresponding to each temperature value based on a calculation formula V1/VL = RL/R1 according to the resistance value of the sampling resistor and the resistance value of the heating device corresponding to each temperature value;

s406: and forming a temperature comparison table by using the obtained temperature values and the corresponding pressure drop ratios thereof, and storing the temperature comparison table into the smoking set.

The invention provides two calibration methods, the first calibration method has relatively higher precision, and the second calibration method has relatively smaller workload.

EXAMPLE III

After the smoking set is started and heated to the preset working temperature, the user can suck the cigarettes, when the sucking action occurs, the external air flows through the cigarettes through the air passages of the smoking set and the heating device, the heat of the cigarettes and the heating device is taken away by the flowing gas due to the cooling effect of the air flow, so that the temperature of the heating device is reduced, the TCR value corresponding to the temperature reduction of the heating device is changed, and finally the V1/VL value detected by the smoking set is changed. As mentioned above, the present invention can accurately measure the temperature, and the MCU determines that one puff is taken when the detected temperature of the smoking set drops to exceed the preset temperature difference (2 ℃) and the duration time exceeds a certain preset value in the preset time length range (300-.

Based on the accurate temperature control of the smoking set, the behavior habit of the user in the use process can be analyzed, and the smoking state parameter information of the user, such as the number of smoking openings, the sequence of the smoking openings, the duration time of smoking, the time interval of smoking, the volume of smoking, and the like, can be obtained. The obtained smoking state can be used for statistical analysis and optimization of smoking set control, personalized improvement with the user habit as a reference, and the like. For example, the MCU may integrate and derive the measured temperature T with respect to time, and further analyze the parameters of the user's pumping process, where the speed of temperature T decrease represents the airflow rate and flow rate of pumping, the duration of temperature T decrease represents the pumping duration of the mouthpiece, the integrated area of temperature T and time represents the pumping gas flow rate of the mouthpiece, and the time interval between two mouthings is the pumping interval time. The detected and analyzed information on the smoking process parameters of the user can be written into the readable access unit of the smoking set as the basic data for statistical analysis and smoking set optimization control.

Preferably, for the calculation of the pumping capacity, in order to increase the calculation rate, the MCU prestores a comparison table in which a plurality of pumping capacities increasing at fixed capacity gradients (for example, a plurality of pumping capacities increasing at 5ML increments in the range of 25-60 ML/port) and the maximum values of the pressure drop ratio values corresponding to the respective pumping capacities are recorded. And in the working process of the MCU, according to the maximum value of the change of the pressure drop ratio measured by each cigarette, inquiring and finding out the suction capacity corresponding to the current mouth suction in a prestored suction capacity comparison table, and optimizing the temperature control parameters of the smoking set according to the number of suction mouths, the suction duration, the suction interval time and the suction capacity value. The smoking capacity has a great influence on the control process of the smoking set, in the embodiment, on the basis of the first embodiment or the second embodiment, a smoking capacity calibration step is further added, and it can be understood that the calibration system corresponding to the third embodiment further comprises a smoking machine, and the smoking machine is connected with the computer through a data line.

Referring to fig. 5, the suction capacity calibration step includes:

s501: the smoking set is connected into a suction channel of a smoking machine, and the smoking set is started by a computer end;

s502: changing the smoking capacity of the smoking machine in a fixed capacity gradient in a preset smoking capacity range, and executing the following steps to obtain the corresponding relation between each smoking capacity and the change maximum value of the pressure drop ratio: after the smoking set is heated to a preset temperature and kept stable, the pressure drop ratio measured in real time is sent to the computer end, and after the smoking set temperature is stabilized, the computer end starts the smoking machine to finish one-time smoking according to preset smoking parameters, wherein the smoking parameters comprise smoking capacity, flow peak type and smoking duration; within the smoking time of the smoking machine for completing one bite, the smoking set sends the measured pressure drop ratio to the computer end in real time, and the computer end records the maximum change value of the pressure drop ratio and the current smoking capacity of the corresponding smoking machine;

s503: and forming a suction capacity comparison table by the corresponding relation of the suction capacities and the maximum value of the change of the pressure drop ratio, and writing the suction capacity comparison table into a readable storage unit of the smoking set.

When the smoking set works, when the detected temperature of the smoking set is reduced and exceeds a preset temperature difference and the duration time exceeds a certain preset value in a preset time length range, one mouth of smoking is judged to occur, and then the number of smoking openings, the smoking duration time and the smoking interval time can be obtained.

In summary, the heating smoking set calibration method and system of the present invention have the following beneficial effects: in the invention, the smoking set directly locks the temperature in a table look-up mode, so that the calculation delay is reduced, the detection precision is improved, and as the temperature comparison table has great influence on the temperature look-up result, in order to ensure the accuracy of the result, the invention provides the calibration of the temperature comparison table, so that the precision and the reliability of the temperature measurement result can be greatly improved; further, the invention also realizes the calibration of the suction capacity.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.