CN116602458A - Heating control method of microwave heating type smoking set - Google Patents
Heating control method of microwave heating type smoking set Download PDFInfo
- Publication number
- CN116602458A CN116602458A CN202310820115.4A CN202310820115A CN116602458A CN 116602458 A CN116602458 A CN 116602458A CN 202310820115 A CN202310820115 A CN 202310820115A CN 116602458 A CN116602458 A CN 116602458A
- Authority
- CN
- China
- Prior art keywords
- microwave
- frequency
- smoking set
- type smoking
- control method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 45
- 230000000391 smoking effect Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 15
- 235000019504 cigarettes Nutrition 0.000 claims abstract description 25
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 241000208125 Nicotiana Species 0.000 description 2
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000796 flavoring agent Substances 0.000 description 2
- 235000019634 flavors Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/50—Control or monitoring
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/20—Devices using solid inhalable precursors
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
- A24F40/46—Shape or structure of electric heating means
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/50—Control or monitoring
- A24F40/57—Temperature control
Abstract
The invention discloses a heating control method of a microwave heating type smoking set, which is characterized in that the microwave heating type smoking set is internally provided with an MCU (micro control unit), a microwave generating circuit and a microwave transmitting antenna, wherein the microwave transmitting antenna is contacted with a cigarette bullet when the cigarette bullet is heated and periodically scans the return loss of the cigarette bullet under each frequency in a certain frequency range, and the MCU selects the frequency with the minimum return loss as the optimal frequency, so that the microwave generating circuit works at the optimal frequency. The invention greatly improves the microwave heating efficiency.
Description
Technical Field
The invention belongs to the technical field of microwave heating control, and particularly relates to a heating control method of a microwave heating type smoking set.
Background
Heating a smoking material such as tobacco to a temperature below its ignition temperature, but sufficient to release the various flavour components, so that it releases the flavour components for smoking by the user, has been the most recent trend in the tobacco field in the world today. The equipment for realizing the heating non-combustion smoke generating mode is commonly called a smoking set. In recent years, microwave heating type smoking articles have been developed, which are classified into resistance heating type, electromagnetic heating type, infrared heating type, and the like, according to the manner in which electric energy is converted into heat energy.
Whichever smoking set is, there is a problem of optimizing the heating pattern according to different compositions or different heating states of the object to be heated (e.g., a cigarette or a cartridge). Therefore, from a control theory perspective, it is necessary to collect a certain state parameter of the heated object, input the state parameter into the microcontroller in the smoking set, and then the microcontroller adjusts the device parameters of the smoking set such as voltage, current, duty cycle and the like through a specific optimization algorithm to adapt to the specific state of the specific heated object, so as to optimize a certain target characteristic (such as smoke amount, mouth-by-mouth consistency and taste) of the smoke release process.
For resistance heating type smoking articles, it is common to measure the temperature of the cigarette as a feedback parameter to the controller. For electromagnetic heating type smoking articles, magnetic properties such as curie temperature and magnetism correction property of an electromagnetic sensor inserted into a cigarette are usually measured as feedback parameters, or the temperature of the cigarette is used as feedback parameters and fed back to a controller. For infrared heating type smoking articles or microwave heating type smoking articles, the feedback parameter that is typically conceivable to the skilled person is also temperature.
The temperature is used only as a feedback parameter, so that the control means is too single, and the temperature in the cigarette generally fluctuates greatly along with the cooling effect of the external air which is inevitably brought into the cigarette during the sucking process of a user, thereby causing inconvenience to control.
Current control strategies in microwave heating, such as microwave ovens, are typically controlled unidirectionally by microwave heating time, and lack a mechanism to obtain a characteristic from the object being heated itself to feedback control the microwave control circuitry. In addition, the most critical microwave frequency selection is manually selected in advance by combining with the past experience, and is fixed once selected, firstly, the optimal frequency which can not be matched with cigarettes of various types is not necessarily needed when the selection is performed, secondly, even if the optimal frequency is the optimal frequency at the beginning of heating, the optimal microwave frequency is dynamically changed after the chemical components and the thermophysical state of the cigarettes change along with the heating process, the whole process cannot be optimal, the low utilization rate of microwave feeding into the cigarettes is inevitably caused, and the phenomena of incapacity of heating the cigarettes, overlarge power consumption of a microwave circuit, low utilization rate of microwaves, burnt cigarettes and the like sometimes occur.
Therefore, a new feedback control method is urgently needed for the microwave heating type smoking set, and the invention is provided.
Disclosure of Invention
The invention provides a heating control method of a microwave heating type smoking set, which is characterized in that an MCU (micro control unit) microcontroller, a microwave generating circuit and a microwave transmitting antenna are arranged in the microwave heating type smoking set.
Preferably, the MCU microcontroller controls the microwave generating circuit through an RS485 communication circuit or an RS422 communication circuit.
Preferably, the frequency range is 2.4-2.5GHz.
Preferably, the scanning is performed every 100ms moving 10MHz, and the scanning of frequencies from 2.4GHz to 2.5GHz is completed within 1 s.
The return loss is also called S11 for short in the microwave heating field, the physical definition of the return loss, the software and hardware setting for measuring the return loss, the MCU microcontroller and the working method thereof, the method for controlling the frequency of the microwave generator and the like are all known in the microwave heating field, and the invention can be directly used by reference.
Compared with the prior art, the invention has the following beneficial effects:
1. aiming at the characteristic that a microwave transmitting antenna needs to be contacted with a cigarette when the microwave heating type smoking set heats the cigarette, the invention creatively proposes the return loss as a control parameter to carry out feedback control, thereby avoiding various defects when the traditional temperature is used as the parameter. Of course, the invention does not exclude that the overheat prevention control and the like are simultaneously performed by combining the temperature parameters, but the overheat prevention control is only performed on the control of the microwave working frequency and various parameters of a microwave circuit, and the overheat prevention control is not directly connected with the temperature hook.
2. The invention uses the return loss as the control parameter to carry out feedback control, thereby realizing the promotion of the following control indexes: the echo loss can reflect the absorption degree of the cigarette to the microwave most accurately, the different absorption degrees determine the utilization rate of the microwave and the temperature rise of the cigarette, and the higher the absorption is, the smaller the echo loss is, the higher the utilization rate of the microwave is, the smaller the overall power consumption is, and the temperature rise of the cigarette is rapid. Therefore, the return loss is used as a control parameter, and the utilization rate, the overall power consumption and the cigarette temperature rise of the current microwave can be reflected most directly.
Drawings
Fig. 1 is a schematic diagram of a control circuit of an exemplary microwave heating type smoking article.
Detailed Description
The following examples are given to illustrate the present invention and should not be construed as limiting the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The components or instruments used are conventional products available commercially without the manufacturer's attention.
Example 1
The microwave generating circuit and the control circuit shown in figure 1 are used for heating cigarettes of a certain model produced in Yunnan. The MCU controls the microwave generating circuit to scan between the frequency bands of 2.4GHz and 2.5GHz every 10s, every 100ms moves 10MHz during scanning, the scanning of 2.4GHz to 2.5GHz is completed within 1s, the return loss of each frequency point is synchronously recorded, the return loss of each frequency point is compared after the scanning is completed, the frequency point corresponding to the minimum return loss is found to be 2.41GHz, the frequency point is used as the output frequency value of the current microwave, the cigarette can obtain the maximum microwave output power at the moment, the microwave circuit obtains the minimum reflected power, the power consumption of the whole circuit is minimum, the microwave generating circuit is scanned again after 10s, the frequency point corresponding to the minimum return loss is found to be 2.43GHz, the MCU controls the microwave generating circuit to work at the frequency of 2.43GHz, and the microwave generating circuit is scanned again after 10s, so that the microwave generating circuit is continuously adjusted to work at the frequency corresponding to the minimum return loss. Therefore, the heating effect which can be realized by 8W of the whole circuit under the whole-course fixed microwave frequency can be realized by only 6W, and meanwhile, the reflected power is reduced by 30%, so that the service life of the microwave circuit is greatly prolonged.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention.
Claims (4)
1. The heating control method of the microwave heating type smoking set is characterized in that the microwave heating type smoking set is internally provided with an MCU (micro control unit) microcontroller, a microwave generating circuit and a microwave transmitting antenna, and the microwave heating type smoking set is characterized in that the microwave transmitting antenna is contacted with a cigarette bullet when the cigarette bullet is heated and scans the return loss of the cigarette bullet at each frequency in a certain frequency range, and the MCU microcontroller selects the frequency with the minimum return loss as the optimal frequency, so that the microwave generating circuit works at the optimal frequency.
2. The heating control method according to claim 1, wherein the MCU microcontroller controls the microwave generating circuit through an RS485 communication circuit or an RS422 communication circuit.
3. The heating control method according to claim 1, wherein the frequency range is 2.4-2.5GHz.
4. A heating control method according to claim 3, wherein the scanning is performed from 2.4GHz to 2.5GHz every 100ms of movement of 10mhz for 1 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310820115.4A CN116602458A (en) | 2023-07-05 | 2023-07-05 | Heating control method of microwave heating type smoking set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310820115.4A CN116602458A (en) | 2023-07-05 | 2023-07-05 | Heating control method of microwave heating type smoking set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116602458A true CN116602458A (en) | 2023-08-18 |
Family
ID=87676714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310820115.4A Pending CN116602458A (en) | 2023-07-05 | 2023-07-05 | Heating control method of microwave heating type smoking set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116602458A (en) |
-
2023
- 2023-07-05 CN CN202310820115.4A patent/CN116602458A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |