Dynamic temperature compensation heating method based on dual-power mirroring law

Abstract

The invention provides a dynamic temperature compensation heating method based on a dual-power mirroring law, which is applied to an aerosol generation system consisting of a cigarette cartridge and a smoking set, and is characterized in that two stages of composite atomization are performed on the same cigarette cartridge through an integrated electromagnetic center heating and resistance circumferential heating dual-mode collaborative technology, and different heating modes are adopted in each stage; the system executes a specific algorithm through the controller to adjust the heating power Pc of the electromagnetic center inside the smoke cartridge and the circumferential heating power Pe of the resistor outside the smoke cartridge, so that the radial temperature difference of the smoke cartridge is converged to a set value Ttar. According to the invention, the change rate of the central heating power Pe directly participates in the feedforward-feedback composite operation of the circumferential heating power Pe, so that the radial heat flow potential is cleared at one time, a cold region in a single mode can be fully carbonized, and the overall utilization efficiency of an aerosol matrix is improved.

Description

Technical Field

[0001] This invention relates to the field of novel tobacco heating technology, specifically a dynamic temperature compensation heating method based on dual-power mirror law. Background Technology

[0002] The mainstream heating method for heated tobacco products is center heating, which involves resistive heating by inserting a heating element or heating needle into the center of the aerosol matrix, or electromagnetic heating by embedding an induction metal plate in the center of the aerosol matrix. However, this type of heating method has the problem of limited heat contact area, which can easily lead to uneven carbonization. At the same time, the heat is mostly concentrated in the central area, forming a relatively cold zone in the outer area, which means that some aerosol matrix is ​​not fully carbonized, resulting in a certain degree of waste.

[0003] Currently, some manufacturers use two different heating modes separately. They first use one type of device to heat the center of the cartridge, and then use another type of device to heat the same cartridge circumferentially after the center heating process is completed.

[0004] Given the current goal of achieving full carbonization of individual e-cigarette cartridges, there is still significant room for optimization in temperature control during the heating process. Therefore, this application proposes an improvement scheme aimed at more fully utilizing the aerosol matrix to enhance the user experience. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a dynamic temperature compensation heating method based on a dual-power mirror law, applied to an aerosol generation system consisting of a cartridge and a device. The cartridge includes an inner core heating element for central heating of the aerosol matrix's central region, and an outer peripheral heating element arranged circumferentially around the cartridge for circumferential heating. The device also includes a controller for controlling and measuring the temperature T of the inner core heating element. c and the temperature T of the peripheral heating element e The controller also adjusts the central heating power P. c and circumferential heating power P e , making T c and T e The temperature difference converges to the set value ΔT tar .

[0006] In a preferred embodiment of the invention, the heating element is a magnetic induction heating element or a resistance heating element. The magnetic induction heating element identifies the temperature by sensing changes in the coil, while the resistance heating element identifies the temperature by a thermistor relationship.

[0007] In a preferred embodiment of the invention, a further configuration of the controller is proposed to detect and control the circumferential heating power P. e and central heating power Pc .

[0008] In a preferred embodiment of the invention, a temperature field model of an aerosol generation system is proposed, and dynamic temperature compensation is performed based on this model.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] 1. By integrating dual-mode collaborative technology of central heating and circumferential heating, a new dynamic temperature compensation heating method based on dual-power mirror law is proposed. This method allows the rate of change of central heating power to directly participate in the feedforward-feedback composite calculation of circumferential heating power, thereby calculating the "radial heat flow potential" in one go. This enables the cold zone in the traditional single heating mode to be fully carbonized, improving the overall utilization efficiency of the aerosol matrix.

[0011] 2. This invention does not simply superimpose central heating and circumferential heating, but rather controls the central temperature and circumferential temperature in a combined manner to reduce the over-carbonized region and expand the fully carbonized region. This results in a fully carbonized volume that is much larger than the simple superposition of the central heating and circumferential heating volumes, thereby making better use of the aerosol matrix. Attached Figure Description

[0012] Figure 1 This is a schematic cross-sectional view of a smoking device.

[0013] Figure 2 This is a schematic diagram of the temperature distribution in the transverse cross-section of the e-cigarette cartridge under static temperature field conditions. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Reference Figure 1 A schematic diagram of the composition of an aerosol generation system, which consists of a smoking device 1 with a composite heating mode and an electromagnetically inductive cartridge 2.

[0016] The smoking device 1 includes a compartment frame 101, a resistance heating element 102, a compartment base 103, a frame 104, a heat insulation layer 105, a coil 106, an insulating film 107, a magnetic conductor 108, a heat-conducting layer 109, a circuit board assembly 110, an electronic circuit system 111, an internal support 112, a battery 113, a charging connector 114, a switch 115, and a housing 116. The compartment frame 101 has an internal cavity; the resistance heating element 102 is tubular, containing a ceramic substrate 102a and a resistance heating wire 102b, with the resistance heating wire 102b arranged around the inside or surface of the ceramic substrate 102a; the resistance heating element 102 is arranged around a local area inside the cavity in a circumferential direction, serving as an outer peripheral heating element. Together with the compartment base 103, they form the main body of the cartridge compartment (cavity). A frame 104 surrounds the outer perimeter of the rack 101, with an annular heat insulation layer 105 between them; a coil 106 is wound around the outside of the frame 104, and an insulating film 107, a magnetic conductor 108, and a heat-conducting layer 109 are further surrounded around its perimeter. A circuit board assembly 110 is installed within the internal space 112 and is connected to a rechargeable battery 113, a charging connector 114, and a switch 115.

[0017] The circuit board assembly carries an electronic circuit system 111, including a first circuit 111a, a second circuit 111b, and a main control circuit 111c. The first circuit 111a is connected to the coil 106 to form a first heating module, which is an electromagnetic center heating module. The second circuit 111b is connected to the resistive heating wire 102b to form a second heating module, which is a resistive circumferential heating module. The main control circuit 111c is used to coordinate and control the first circuit 111a, the second circuit 111b, the rechargeable battery 113, the charging connector 114, and the switch 115.

[0018] All the aforementioned hardware components are integrated into the housing 116, constituting the smoking device 1. The key hardware feature of this smoking device 1 is that it is equipped with first and second heating modules, enabling a combined heating process.

[0019] The cartridge 2 is composed of an external cigarette tube 201 and internal components. The internal components include a filter 202, a cooling component 203, an aerosol matrix 204, an electromagnetic heating element 205, and a bottom plug 206. The electromagnetic heating element 205 is located in the central area of ​​the aerosol matrix 205 and serves as the inner core heating element.

[0020] In this application, the electronic circuit system 111, the resistance heating element 102, the coil 106, and the electromagnetic heating element 205 constitute the controller, which is the core component of the aerosol generation system to realize various functions. The controller is used to control the temperature T of the electromagnetic heating element 205. c and the temperature T of the resistance heating element 102 e T c Configured to identify via coil 106, T eConfigured to identify the temperature T of the resistance heating element 102 by means of the relationship between its resistance value and temperature, this application considers the temperature T to be... e The temperature of cartridge 2 corresponds approximately to or is equivalent to the temperature of the outer surface of section 204 of the aerosol matrix; the controller executes a specific algorithm to control the heating power P of the electromagnetic center inside cartridge 2. c The external resistance circumferential heating power P of the cigarette cartridge 2 e This causes the radial temperature difference of cartridge 2 to converge to the set value ΔT. tar This will be elaborated on further later.

[0021] Traditional single-mode electromagnetic central heating suffers from uneven thermal field and limited thermal contact area, leading to insufficient carbonization at the edges of the aerosol matrix. This application addresses this issue by using a heating module to achieve electromagnetic induction heating. The heating module, composed of a circuit board assembly connected to a coil, generates a high-frequency alternating electromagnetic field. This field excites the electromagnetic heating element (also called a sensor), producing eddy currents and hysteresis effects, thus establishing the electromagnetic central heating mode.

[0022] Figure 2 This paper presents a simulation of the temperature distribution of a vapor cartridge in a plane perpendicular to the central axis under static thermal equilibrium when using a sheet-like heating element for conventional center heating (based on electromagnetic or resistive modes). The operating temperature of the sheet-like heating element (such as an electromagnetic heating metal sheet or a resistive heating ceramic sheet) located at the center of the aerosol matrix is ​​set to a stable 350°C, and this heating is a single-mode heating. The simulation plots isotherms at 312°C, 245°C, and 180°C. It can be seen that the thermal field distribution in this plane is non-uniform, with a large temperature gradient in the radial direction. Based on experience with the suitable lower limit of carbonization temperature (240-260°C) for common aerosol matrices, this application defines the inner region surrounded by the 312°C isotherm in the figure as the highly carbonized region A; the difference between the inner region surrounded by the 245°C isotherm and the fully carbonized region as the effective carbonized region B; the difference between the inner region surrounded by the 180°C isotherm and the inner region surrounded by the 245°C isotherm as the partially carbonized region C; and the region surrounding the 180°C isotherm is defined as the uncarbonized region D. C and D are insufficiently carbonized regions, which can also be defined as cold regions, with the cold region area exceeding 50% of the cross-sectional area of ​​the cartridge. If this single mode of central heating with a sheet-like heating element is used to atomize the cartridge, the aerosol matrix in the cold region will not be effectively utilized, resulting in a waste of more than 50% of the area.

[0023] From a heating perspective, it is necessary to reduce the size of zones A and C, eliminate zone D, and maximize the size of zone B. From a three-dimensional perspective, it is necessary to maximize the effective carbonization zone B. This invention controls the central heating power and circumferential heating power in a combined and linked manner. The advantage of this is that it can effectively reduce and control the temperature of the central heating element, thereby reducing the excessive carbonization portion of zone A by more than 50%, which helps to reduce the burnt smell of the flue gas and further improves the heating efficiency by more than 30%.

[0024] From the perspective of airflow channels and axial heat transfer, circumferential heating preheats the airflow entering the cartridge, allowing a portion of the aerosol matrix near the far end of the cartridge (the other end corresponding to the mouth end) to be heated more fully, thereby further improving the effective carbonization zone of the entire cartridge in the axial direction.

[0025] This application is equipped with a first heating module, which uses a coil surrounding the periphery of the compartment to excite and control the electromagnetic heating element in the aerosol matrix of the e-cigarette cartridge, thereby realizing the above-mentioned electromagnetic center heating mode.

[0026] This application also includes a second heating module to address the shortcomings of the single-mode central heating of this sheet-like heating element. The second heating module consists of a second circuit connected to a tubular resistance heating element within a circuit board assembly. It generates resistance Joule heating to conduct heat to the aerosol matrix section located within the tube, thereby establishing a circumferential resistance heating mode. The second circuit is a low-voltage DC constant voltage or constant power circuit, and its load is the resistance heating wire.

[0027] A tubular resistance heating element consists of a tubular ceramic substrate and a resistance heating wire arranged on or within it. The resistance heating wire is made of metal or graphene, and the metal contains one or more of the elements selected from tungsten, platinum, silver, nickel, chromium, molybdenum, aluminum, manganese, and copper. Because the tubular resistance heating element is located inside the coil, its configuration must meet three requirements.

[0028] Firstly, it cannot be magnetic; otherwise, eddy currents and hysteresis heating will easily be generated within the first heating module during operation, severely interfering with the resistive Joule heating function and making accurate temperature monitoring and control of the aerosol system difficult. Therefore, in this application, the tubular carrier is made of a ceramic matrix, such as zirconia ceramic or alumina ceramic; the resistive heating wire is made of the aforementioned non-magnetic material, preferably tungsten, platinum, silver, or nickel-chromium alloy as the heating wire material.

[0029] Secondly, the amount of heating wire used should be minimized to reduce its shielding effect on the electromagnetic field, allowing the high-frequency alternating electromagnetic field generated by the first heating module to effectively act on the magnetic sensor located inside it. Therefore, in this application, the total weight of the resistance heating wire is set to no more than 3g, which is controlled by adjusting the length and cross-sectional area of ​​the resistance heating wire. A typical resistance heating wire circuit thickness is 10-50 micrometers, formed by printing a paste containing tungsten, platinum, silver, and nickel-chromium alloy powders and then sintering it to create a relatively thin circuit.

[0030] Thirdly, it needs to be configured with a large-area hollow shape to reduce the absorption of magnetic field energy generated by the coil. The resistance heating wire cannot be made into a large-area wrapped cylindrical or arc-shaped surface, because it will absorb magnetic energy and weaken the penetration of the main magnetic field generated by the coil into its internal space, making the coupling efficiency between the magnetic sensor and the original strong magnetic field of the first heating module extremely low when it is working.

[0031] In the circumferential resistance heating mode, the annular heating element has a large thermal contact area with the outer side of the aerosol matrix section of the cigarette cartridge. At the same height, the side area of ​​the annular heating element is at least 3.14 times the plane area at its central axis. Therefore, compared with the sheet heating element located at the plane position of the central axis, the thermal contact area of ​​this configuration is significantly improved, which can improve the heat conduction speed, reduce the temperature gradient, improve the uniformity of the temperature field, and improve the heat conduction efficiency.

[0032] This application employs a dual-mode collaborative working mode of electromagnetic central heating and resistance circumferential heating, overcoming the shortcomings of a single mode and complementing each other to perform two-stage atomization of the same e-cigarette cartridge, significantly improving the heating effect and increasing the utilization rate of the aerosol matrix. The two composite heating modules complement each other in terms of heat source space, solving the problems of cold zones (edge ​​cold zones in electromagnetic central heating / central cold zones in resistance circumferential heating) and heat flow guidance that exist in single modes.

[0033] From a radial heat transfer perspective, the electromagnetic central heating module (first module) focuses on heating the central region of the aerosol matrix (most of the area within a diameter of 2-4 mm), activating the internal components; the resistance circumferential heating module ultimately covers the outer circumferential ring of the aerosol matrix (the ring width is approximately 1-2 mm), eliminating edge cold zones, i.e., insufficiently carbonized areas. This three-dimensional thermal field coverage significantly reduces cold zones, improves thermal field uniformity, and reduces the carbonization residue rate (the ratio of uncarbonized areas). From an axial heat transfer perspective, the resistance circumferential heating module (second module) preheats the externally supplied fresh air, thereby promoting its convective heat transfer effect within the aerosol matrix. The airflow channel in the smoking device of this application is as follows: fresh air flows from the near end (mouth end) of the cartridge downwards through the local gap between the tubular resistance heating element and the outer surface of the cartridge, reaches the far end of the cartridge, then enters the interior of the cartridge from its bottom, flows through the aerosol matrix, and finally enters the user's mouth. When working together, this increased thermal convection reduces the negative impact of external cold air on heat, thereby further improving the heat flow guidance efficiency of the aerosol generation system along the axial direction.

[0034] Regarding improvements in reverse heat loss, this involves external heat insulation and internal enhancement of heat penetration. On one hand, the radial heat transfer of circumferential resistance heating is bidirectional. This application sets a heat insulation layer between the tubular heating element and the coil to isolate the heat generated by the tubular heating element and the electromagnetic heating element within the cartridge chamber (cavity) and allow it to act on the aerosol matrix, thus slowing down heat transfer to the external coil and other components. The heat insulation layer can be selected from one or more of the following materials: aerogel, liquid crystal polymer, rock wool, ceramic fiber, polyimide, polyetheretherketone, mica sheet, and calcium silicate. On the other hand, the thermal conductivity of the tube also affects the heat transfer efficiency and speed, so a thinner tube should be used as much as possible. This application sets the average wall thickness of the tube in the section corresponding to the aerosol matrix to be in the range of 0.01-0.4 mm. A thinner tube configuration is more conducive to the rapid penetration of heat generated by circumferential resistance heating to the aerosol matrix, and a slightly lower carbonization operating temperature can be set to further reduce the generation of a pastry-like taste.

[0035] Based on the above logic, the heating efficiency being more than 30% higher means that, taking into account both the in-plane and axial space, the volume of the composite effective carbonization zone in this application is increased by more than 30% compared to the superimposed effective carbonization zone obtained by heating the center first and then the circumferential zone.

[0036] Based on the dual-mode collaborative working method proposed in this application, in one working mode, the single-stage heating atomization process can be divided into three processes: preheating period, main heating period, and finishing period. These three processes include: (1) Preheating period: resistance circumferential heating starts first (3-5 seconds), and the overall temperature of the aerosol matrix rises to 150-200℃, avoiding cold start condensation and reducing viscosity to facilitate component release; (2) Main heating period: electromagnetic center heating pulse and resistance circumferential heating work simultaneously at a constant temperature. The instantaneous high temperature (300-350℃) of electromagnetic center heating excites volatile substances in the aerosol matrix, while resistance circumferential heating maintains the overall temperature; (3) Finishing period: resistance circumferential heating works alone and gradually cools down to prevent residual heat from causing excessive carbonization of the aerosol matrix.

[0037] In aerosol generation systems, temperature monitoring and control are crucial. This application optimizes the control logic by employing an intelligent feedback system to simultaneously monitor the temperature at the center of the aerosol matrix and the temperature on the outer surface of the cartridge. The temperature at the center of the aerosol matrix, i.e., the temperature T of the electromagnetic heating element... c By observing the change in the system's impedance caused by the change in its magnetic permeability with temperature, real-time inference can be performed without the need for an additional temperature sensor. The temperature T of the outer surface of the cartridge, i.e., the temperature of the annular resistance heating element, is... e It can be back-calculated in real time through the relationship between its resistance value and the temperature coefficient of resistance, without the need for an additional temperature sensor for measurement.

[0038] Example 1

[0039] After monitoring the real-time temperatures of the two heating elements, the main control program adjusts the power input in real time to dynamically maintain these temperatures at preset levels. Furthermore, through circuit co-design, efficiency gains are achieved, resulting in a significant reduction in total power consumption between the dual-mode and single-mode heating methods. This application proposes a dynamic temperature compensation heating method based on a dual-power mirror law, applicable to aerosol generation systems.

[0040] The dual-power mirror law described in this application is based on heating the electromagnetic center with power P. c The rate of change directly participates in the circumferential heating power P of the resistance. e The feedforward-feedback composite operation, which uses two types of power from different locations for composite heating and realizes the composite operation of mirror feedback based on the following expression, is a brand-new design concept proposed by the applicant.

[0041] Specifically, the circumferential heating power P e Executed by the improved algorithm, using the following expression (1):

[0042] …….(1)

[0043] in,

[0044] P e (t) represents the circumferential heating power, i.e., the instantaneous power (W) of the circumferential heating of the outer ring resistor.

[0045] P base The feedforward reference power can be taken as 0.2–0.4 × maximum rated power;

[0046] K p K i and K d The proportional, integral, and differential coefficients are respectively, satisfying the following condition:

[0047] 0.3W / ℃≤K p ≤2.0W / ℃;

[0048] 0.05W / (℃·s)≤K i ≤0.5 W / (℃·s;

[0049] 0.01 W·s / ℃≤K d ≤0.2W·s / ℃;

[0050] Its corresponding typical experimental value is: K p =0.8W / ℃, K i =0.15W / (℃·s), K d =0.05 W·s / ℃;

[0051] Central heating power P c It can be fixed at the maximum allowed value, or only the upper limit clamp can be applied.

[0052] When the temperature at the center is T c Temperature T of the outer surface e If the temperature is too high, the controller will immediately increase the circumferential heating power P applied to the outer ring. e When the temperature difference between the two is close to ΔT tar To maintain the circumferential heating power P e At low input levels, temperature overshoot is prevented. This allows the carbonization front to advance synchronously from the inside out, ultimately achieving radially uniform carbonization. In this application, ΔT tar It will update automatically, T set The carbonization threshold temperature of the aerosol matrix, ranging from 220 to 350°C, is pre-stored in the non-volatile memory of the control system before leaving the factory.

[0053] And when the temperature T at the center c If it is still at a low level, it indicates that ΔT tar If the temperature is set too high, it can be decreased by 2°C each time for self-learning and correction. If T appears for N consecutive cycles... e >T cThen ΔT tar Automatically decrease by 1°C until T e ≤T c .

[0054] T c and T e The temperature range is 20-350℃, ΔT tar The value range is 2℃≤ΔT tar ≤20℃, preferably 5-10℃ The value range is 0-30W, with 5-15W being preferred.

[0055] Temperature T of the resistance heating element e Its relationship with its resistance value is expressed by expression (2):

[0056] …….(2)

[0057] Temperature can be monitored by utilizing the linear relationship between resistance and temperature, thus eliminating the need for an additional, separate temperature sensor. The temperature coefficient of resistance of a resistive heating element. Let be the measured resistance value of the resistive element at time t. This is the nominal resistance value of the component at the reference temperature. This is the reference temperature (calibration point, such as 20°C).

[0058] In expression (1), Satisfy the following expression (3):

[0059] …….(3)

[0060] The circumferential heating power P is calculated in real time according to expressions (1) and (3). e That is, to compensate for power and to perform PWM control on the resistance heating element; when the following conditions are met simultaneously:

[0061] |T c -Tset| < 3℃, and

[0062] |T e -T set | <3℃, and

[0063] |T c -T e |≤ΔT tar +2℃;

[0064] And when the duration is maintained for t hold If ≥5s are elapsed, carbonization is considered complete, and the system enters the heat preservation or shutdown phase. holdThis represents the duration of continuous heating of the aerosol matrix. To prevent P from... e It's not just about "chasing" the temperature difference, but about increasing the central heating power P c The rate of change directly participates in the circumferential heating power P e The feedforward-feedback composite operation calculates the radial heat flux potential in one step. P e With P c They are bound together by a "dynamic coupling factor," forming a two-power mirror law. Dynamic coupling factor The real-time calculation method is expressed as expression (4):

[0065] ... (4);

[0066] Furthermore, based on this, the circumferential heating power P is calculated. e The expression is as follows (5):

[0067] ... (5);

[0068] Where m is the thermal mirror coefficient, taking values ​​from 0.1 to 2.0, i.e., m∈[0.1, 2.0]; The thermal inertia time constant takes values ​​from 1 to 8, i.e. ∈[1, 8]; This is the feedforward baseline weighting coefficient, with a value ranging from 0.2 to 0.8. ∈[0.2, 0.8]; α is the upper limit threshold of the power ratio, which takes the value of 1.5-4.0, that is, α∈[1.5, 4.0].

[0069] Where sat() is the saturation function, sat(x) = min(max(x,0),1), x = -P e / P c The preferred value of α is 2.2; when α < 1.5, the circumferential heating power P e Saturation stall occurs, and carbonization uniformity decreases by >10%; when α>4.0, overheating of the outer ring leads to an increase in coke release of >15%.

[0070] In the technical effects corresponding to this technical solution, Increase the circumferential heating power P of the outer ring e It responds in advance to transient changes in central heating power, thus solving the problem of "thermal inertia lag". The radial temperature difference is still clamped at ΔT during steady state. tar .

[0071] In a further scheme, if the thermal mirror coefficient m saturates for N consecutive cycles, m is automatically incremented by 0.1 until it exits saturation and maintains the current value of m. In an optional scheme, the increment step size Δm ∈ [0.05, 0.2]. By automatically increasing the thermal mirror coefficient m, i.e., the feedforward coefficient m, the outer ring reaches the wall earlier in the next round of central heating, thereby forcibly pulling up the temperature of the cold zone and achieving adaptive carbonization catch-up.

[0072] Example 2

[0073] Furthermore, this application determines the location and intensity of temperature compensation based on the radius (shortest and longest) of the cold or hot zone of the carbonization zone, so that the cold zone can also be fully carbonized, thereby improving the overall utilization efficiency of the aerosol matrix.

[0074] This invention establishes a mathematical model of the temperature field during the heating process of the tobacco cartridge, enabling real-time monitoring or estimation of the temperature distribution inside the cartridge and identification of the carbonization zone. The expression for this temperature field model is formula (6):

[0075] ... (6);

[0076] Where T(r,t) is the temperature at time t at a distance r from the center. 中心 γ is the temperature of the heating element, and γ is the thermal diffusivity, which is related to the thermal conductivity of the material.

[0077] Set the carbonization temperature threshold T 碳化 ,when ≥T 碳化 At that time, it was believed that carbonization had occurred in the area.

[0078] Therefore, the radius R of the hot zone can be determined. 热 (t), satisfying T(R) 热 ,t)=T 碳化 The minimum radius.

[0079] Let the radius of the cold zone be R. 冷 (t) represents the radius of the uncarbonized area around the cartridge; let the physical radius of the cartridge be R. 总 Then the expression for cold zone compensation is formula (7):

[0080] ... (7);

[0081] R 热 (t) represents the "equivalent radius" of the carbonized zone at the current moment (i.e., the distance from the outer edge of the hot zone to the center), which is given by the temperature field model in real time. To compensate for the location coefficient, 0≤δ≤1, the larger the coefficient, the earlier the cold zone will be compensated.

[0082] For example, when the radius R of the smoke bomb总 When the radius of the hot zone is 4.0 mm, if the radius of the hot zone is R 热 =2.0mm, take δ=0.5, then we can calculate according to formula (7) =2.0+0.5×(4.0-2.0)=3.0mm.

[0083] Based on this model and method, optimal parameters for a certain specification of aerosol generation system can be determined. By combining the temperature control method in Example 1 with corresponding temperature compensation control, the best heating efficiency can be achieved, thereby ensuring that the cold zone can also be fully carbonized.

[0084] Example 3

[0085] In current aerosol generation systems, a single heating mode is typically used for single-stage atomization of the same e-cigarette cartridge, meaning it is disposable and discarded after use, resulting in waste. This application utilizes a composite heating mode to reuse the e-cigarette cartridge, which can be described as a two-stage heating composite atomization of a single cartridge, i.e., heating and atomizing in the first stage followed by heating and atomizing in the second stage. The first and second stages are defined as the entire process from the start of heating in this single stage, based on certain system parameters, until a predetermined threshold is reached. These parameters may include continuous working time (e.g., 5 minutes), cumulative number of puffs (e.g., 12 puffs), and cumulative power consumption (e.g., 80W). The controller can be programmed with an algorithm to determine whether a single stage is complete; for example, reaching one of certain parameters can indicate that the stage is complete. Based on this, a series of composite heating modes can be adopted, including:

[0086] A single heating mode is used in both the first and second stages, for example:

[0087] In one exemplary embodiment, the first stage employs electromagnetic central heating; the second stage employs resistance circumferential heating.

[0088] In one exemplary embodiment, the first stage employs circumferential resistance heating; the second stage employs central electromagnetic heating.

[0089] It can be inferred that in both of the above cases, if the first and second stages are performed consecutively, there will be an opportunity for "heating while it's still hot." During the second stage of heating and atomization, the temperature difference between the central and peripheral regions of the aerosol matrix is ​​significantly reduced compared to the temperature difference in a single-stage heating mode during one-time use, thus enabling faster and more efficient aerosol release.

[0090] A combined heating mode is used in both the first and second stages, for example:

[0091] In one exemplary embodiment, the first stage employs a composite heating mode of electromagnetic central heating and resistance circumferential heating, including synchronous heating throughout the entire time, alternating heating throughout the entire time, synchronous heating for part of the time, and alternating heating for part of the time; the second stage employs a composite heating mode different from the first stage.

[0092] In one of the first and second stages, a single heating mode is used, while in the other stage, a combined heating mode is used, for example:

[0093] In one exemplary embodiment, the first stage employs a single mode of electromagnetic central heating or resistance circumferential heating; the second stage employs a composite heating mode of electromagnetic central heating and resistance circumferential heating, including synchronous heating throughout the entire time, alternating heating throughout the entire time, synchronous heating for part of the time, and alternating heating for part of the time.

[0094] In one exemplary embodiment, the first stage employs a composite heating mode of electromagnetic central heating and resistance circumferential heating, including synchronous heating throughout the entire time, alternating heating throughout the entire time, synchronous heating for part of the time, and alternating heating for part of the time; the second stage employs a single mode of electromagnetic central heating or resistance circumferential heating.

[0095] In each stage of Embodiment 3, the temperature T of the electromagnetic heating element can be monitored through an electronic circuit system in conjunction with a coil. c And the temperature T of the resistive heating element is monitored by the relationship between resistance and temperature. e It also provides real-time feedback to the system to adjust the power input and perform compound linkage.

[0096] It is worth noting that the heating modes in the first and second stages should not be exactly the same. That is, the principles, locations, times, power input parameters, and control logic used in the two heating stages cannot be identical. Otherwise, it can easily lead to repeated and excessive carbonization, negating the purpose of the real-time two-stage atomization configuration. The aerosol generation system in this invention employs a two-stage heating process on the same cartridge, using different heating and atomization modes in each stage, referred to as a dual-mode synergistic mode.

[0097] After the first phase is completed, the system can switch to the second phase in either automatic or manual mode.

[0098] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0099] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic temperature compensation heating method based on a dual-power mirror law, characterized by, Applied to an aerosol-generating system composed of a cartridge and a smoking set; The cartridge comprises an inner core heating element for central heating of the central region of the aerosol substrate, and an outer peripheral heating element arranged circumferentially on the periphery of the cartridge for circumferential heating; The smoking set further comprises a controller for controlling and measuring the temperature T of the inner core heating element c and the temperature T of the outer peripheral heating element e ; The controller also adjusts the central heating power P c and the circumferential heating power P e so that the temperature difference between T c and T e converges to a set value ΔT tar .

2. The dual power mirror law based dynamic temperature compensation heating method of claim 1, wherein, The heating element is a magnetic induction heating element or a resistance heating element, the magnetic induction heating element identifies temperature through coil induction change, and the resistance heating element identifies temperature through a temperature-sensitive resistance relationship.

3. The dual power mirror law based dynamic temperature compensation heating method of claim 1, wherein, The controller is configured to control the circumferential heating power P e The following expression is executed: ； Wherein, 。 4. The dual power mirror law based dynamic temperature compensation heating method of claim 3, wherein, The controller is further configured to: The dynamic coupling factor is calculated according to the following expression : ； The circumferential heating power P is calculated according to the following expression e : ； where the thermal image coefficient m∈[0.1, 2.0], the thermal inertia time constant ∈[1, 8], the feedforward reference weight coefficient ∈[0.2, 0.8], the power ratio upper threshold value α∈[1.5, 4.0]; sat() is a saturation function.

5. The dual power mirror law based dynamic temperature compensation heating method of claim 1, wherein, T e and T c The temperature range of both T tar is in the range of 2°C ≤ ΔT tar ≤ 20°C. 6.The dynamic temperature compensation heating method based on a dual-power mirror law according to claim 1, characterized by, If T e > T c for N consecutive periods, then ΔT tar is automatically reduced by 1 °C until T e ≤ T c .

7. The dual power mirror law based dynamic temperature compensation heating method of claim 1, wherein, When the following conditions are met simultaneously: |T c - T set | < 3°C, and |T e - T set | < 3°C, and |T c -T e |≤ΔT tar +2°C; and when the continuous holding time t hold ≥ 5 s, it is determined that complete carbonization has been completed, and the system enters standby or shutdown. where T set is the carbonization threshold temperature of the aerosol substrate.

8. The dual power mirror law based dynamic temperature compensation heating method of claim 4, wherein, If the dynamic coupling factor appears for N consecutive periods If saturation occurs, the thermal image coefficient m is automatically increased by 0.1 until saturation is removed and the current m value is maintained.

9. The dual power mirror law based dynamic temperature compensation heating method of claim 1, wherein, The temperature field model expression of the aerosol-generating system is: ； where T(r, t) is the temperature at a distance r from the center at time t, T 中心 is the temperature of the central electromagnetic heating element, and γ is the thermal diffusivity.

10. The dual power mirror law based dynamic temperature compensation heating method of claim 9, wherein, The control expression for cold zone compensation is: ； wherein to compensate for the position coefficient, 0 < δ < 1.

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