CN116406866A

CN116406866A - Aerosol generating device and control method thereof

Info

Publication number: CN116406866A
Application number: CN202111631229.1A
Authority: CN
Inventors: 梁坤新; 徐中立; 李永海
Original assignee: Shenzhen FirstUnion Technology Co Ltd
Current assignee: Shenzhen FirstUnion Technology Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2023-07-11

Abstract

An aerosol-generating device and method of controlling the same, the aerosol-generating device comprising a chamber for removably receiving an aerosol-generating article; wherein the aerosol-generating article comprises a susceptor; alternatively, the aerosol-generating device comprises a susceptor, and the susceptor is movably received in or removed from the chamber with the aerosol-generating article; an oscillating circuit comprising a capacitor and an inductor inductively coupled to the susceptor; a controller configured to transmit a pulse signal to drive the oscillation circuit to generate damped oscillation; detecting an oscillating voltage signal generated by the oscillating circuit; and determining that the aerosol-generating article is received in or removed from the chamber from the oscillating voltage signal. According to the method, the pulse signal sent by the controller is used for driving the oscillating circuit to generate damped oscillation, and whether the cigarette is inserted or pulled out is judged according to the oscillating voltage signal generated by the oscillating circuit, so that the action of the heater is controlled; the implementation mode is simple, and the user experience is improved.

Description

Aerosol generating device and control method thereof

Technical Field

The present application relates to the field of smoking articles, and in particular to an aerosol-generating device and a method of controlling the same.

Background

Smoking articles such as cigarettes and cigars burn tobacco during use to produce smoke. Attempts have been made to provide alternatives to these tobacco-burning articles by creating products that release compounds without burning. An example of such a product is a so-called heated non-combustible product, which releases a compound by heating tobacco rather than burning tobacco.

Disclosure of Invention

In one aspect the present application provides an aerosol-generating device comprising:

a chamber for removably receiving an aerosol-generating article; wherein the aerosol-generating article comprises a susceptor; alternatively, the aerosol-generating device comprises a susceptor, and the susceptor is movably received in or removed from the chamber with the aerosol-generating article;

an oscillating circuit comprising a capacitor and an inductor inductively coupled to the susceptor;

a controller configured to transmit a pulse signal to drive the oscillation circuit to generate damped oscillation; detecting an oscillating voltage signal generated by the oscillating circuit; and determining that the aerosol-generating article is received in or removed from the chamber from the oscillating voltage signal.

Another aspect of the present application provides an aerosol-generating device comprising:

a switching circuit configured to be alternately turned on and off so that the inductor flows an alternating current and generates a varying magnetic field;

wherein, when the aerosol-generating article is received in the chamber, the varying magnetic field penetrates the susceptor to cause the susceptor to heat the aerosol-generating article;

further comprises:

a controller configured to transmit a pulse signal to the switching circuit to turn on the oscillating circuit and cause the oscillating circuit to generate damped oscillation during the turn-on; detecting an oscillating voltage signal generated by the oscillating circuit; from the oscillating voltage signal, it is determined that the aerosol-generating article is received in or removed from the chamber.

Another aspect of the present application provides a method of controlling an aerosol-generating device, the method comprising:

transmitting a pulse signal to drive an oscillating circuit to generate damped oscillation;

detecting an oscillating voltage signal generated by the oscillating circuit;

from the oscillating voltage signal, it is determined that the aerosol-generating article is received in or removed from the chamber.

According to the aerosol generating device and the control method thereof, the pulse signal sent by the controller is used for driving the oscillating circuit to generate damping oscillation, and whether the cigarette is inserted or pulled out is judged according to the oscillating voltage signal generated by the oscillating circuit, so that the action of the heater is controlled; the implementation mode is simple, and the user experience is improved.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures are not to scale, unless expressly stated otherwise.

Fig. 1 is a schematic view of an aerosol-generating device provided in an embodiment of the present application;

fig. 2 is a schematic view of an aerosol-generating article and an aerosol-generating device provided in an embodiment of the present application;

fig. 3 is a schematic view of an aerosol-generating article provided in an embodiment of the present application;

fig. 4 is a schematic cross-sectional view of an aerosol-generating article provided in an embodiment of the present application;

FIG. 5 is a schematic diagram of a portion of a circuit provided in an embodiment of the present application;

FIG. 6 is a schematic diagram of a first pulse signal provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of an oscillating voltage signal provided by an embodiment of the present application;

fig. 8 is a schematic diagram of a control method of an aerosol-generating device according to an embodiment of the present application;

fig. 9 is a schematic diagram of a control process of an aerosol-generating device according to an embodiment of the present application.

Detailed Description

In order to facilitate an understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "upper", "lower", "left", "right", "inner", "outer" and the like are used in this specification for illustrative purposes only.

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 application belongs. The terminology used in the description of the present application in this description is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1-2, an aerosol-generating device provided in an embodiment of the present application includes:

the power supply 10 is a chargeable direct-current core and can output direct current;

in a preferred implementation, the power supply 10 provides a DC supply voltage in the range of about 2.5V to about 9.0V, and the power supply 10 may provide a DC current having an amperage in the range of about 2.5A to about 20A.

An inductor L for generating a varying magnetic field under an alternating current;

depending on the arrangement in use of the product, the inductor L may comprise a cylindrical coil wound in a spiral. The helically wound cylindrical coil may have a radius r in the range of about 5mm to about 10mm, and in particular the radius r may be about 7mm. The length of the helically wound cylindrical coil may be in the range of about 8mm to about 14mm, with the number of turns of the coil being in the range of about 8 turns to 15 turns. Accordingly, the internal volume may be about 0.15cm ³ To about 1.10cm ³ Within a range of (2).

A chamber 20, the aerosol-generating article 100 being removably received within the chamber 20;

the circuit 30 is electrically connected to the power supply 10 by means of suitable electrical connections for converting the direct current output from the power supply 10 into an alternating current of a suitable frequency and supplying it to the inductor L.

In a preferred implementation, the frequency of the alternating current supplied by circuit 30 to inductor L is between 80KHz and 400KHz; more specifically, the frequency may be in the range of about 200KHz to 300 KHz.

In the embodiment shown in fig. 1, the aerosol-generating device further comprises a support 40 for the placement of the inductor L, the support 40 being of a material which may comprise a high temperature resistant non-metallic material such as PEEK or ceramic or the like. In practice, the inductor L is fixed by wrapping around the outer wall of the bracket 40. Meanwhile, according to the hollow tubular shape of the holder 40, which tubular hollow partial space forms the above-mentioned chamber 20 for receiving the aerosol-generating article 100, is shown in fig. 1.

As shown in fig. 3-4, the aerosol-generating article 100 comprises a filter segment 101, an aerosol-generating segment 102 having smokable material. The smokable material is preferably a tobacco-containing material that releases volatile compounds from a matrix when heated; or may be a non-tobacco material capable of being heated and thereafter adapted for electrical heating for smoking. The smokable material is preferably a solid matrix and may comprise one or more of a powder, granules, shredded strips, ribbons or flakes of one or more of vanilla leaves, tobacco leaves, homogenized tobacco, expanded tobacco; alternatively, the solid substrate may contain additional volatile flavour compounds, either tobacco or non-tobacco, to be released when the substrate is heated.

The aerosol-generating article 100 further comprises a susceptor 103, the susceptor 103 being in thermal contact with the smokable material. When the aerosol-generating article 100 is received or inserted into the chamber 20, the susceptor 103 may be inductively coupled with the inductor L and heat up by penetration of a varying magnetic field, thereby heating the smokable material, volatilizing at least one component of the smokable material, forming an aerosol for inhalation.

The susceptor 103 is preferably needle-shaped, bar-shaped or leaf-shaped. The susceptor 103 has a length dimension that is greater than its width dimension or its thickness dimension. The susceptor 103 may be arranged substantially longitudinally within the aerosol-generating section 102, e.g. approximately parallel to the longitudinal direction of the aerosol-generating section 102. In a preferred embodiment, the elongate susceptor 103 may be located at a radially central position within the aerosol-generating segment 102 and extend along the longitudinal axis of the rod.

The susceptor 103 may be made of any material that is capable of being inductively heated to a temperature sufficient to cause the smokable material to generate an aerosol. Preferred susceptors 103 comprise metal or carbon. Preferred susceptors 103 may comprise ferromagnetic materials, such as ferrite, ferromagnetic steel or stainless steel. Suitable susceptors 103 may be or may include aluminum. Preferred susceptors 103 may be made of 400 series stainless steel, such as grade 410, grade 420 or grade 430 stainless steel.

Fig. 5 is a schematic diagram of a part of a circuit provided in an embodiment of the present application.

As shown in fig. 5, the circuit 30 includes a driving circuit 31, a switching circuit 32, an oscillating circuit 33, and a detecting circuit 34.

The driving circuit 31 controls the switching tubes in the switching circuit 32 to be alternately turned on and off according to a control signal (input through the 8 th I/O port) of a controller (not shown in the drawing).

In a preferred embodiment, the driving circuit 31 is a common FD2204 type switching tube driver, which is controlled by the controller in a PWM manner, and the first switching tube Q3 and the second switching tube Q4 are driven by alternately outputting a high level and a low level through the 3 rd and the 10 th I/O ports according to the pulse width of the PWM, so as to control the oscillating circuit 33 to generate resonance.

In alternative implementations, the drive circuit 31 may be part of the controller.

The switching circuit 32 is a circuit composed of transistor switches.

In a preferred embodiment, the switching circuit 32 comprises a first switching tube Q3 and a second switching tube Q4 for resonating the oscillating circuit 33 by alternating on-off switching.

In alternative implementations, the switching circuit 32 may be constructed of a single switching tube.

An oscillating circuit 33 for forming an alternating current through the inductor L during resonance, thereby causing the inductor L to generate an alternating magnetic field to induce heating of the susceptor 103.

In a preferred implementation, the oscillating circuit 33 consists of an inductor L with a first capacitance C3 and a second capacitance C7; in connection, a first end of the first capacitor C3 is connected to a second electrode (pp_lcc in the figure) of the power supply, and a second end is connected to a first end of the second capacitor C7; a second end of the second capacitor C7 is connected with a first electrode (ground end) of the power supply; the first end of the inductance coil L is connected to the second end of the first capacitor C3, and the second end is connected to the second electrode through the first switching tube Q3 and the first electrode through the second switching tube Q7.

In alternative implementations, the oscillating circuit 33 may be an LC series or parallel resonant circuit.

The detection circuit 34 is configured to detect an oscillating voltage signal generated by the oscillation circuit 33.

In a preferred implementation, the detection circuit 34 includes a first resistor R1 and a second resistor R2 connected in series between a first end of the inductor L and a first electrode of the power supply (ground). In alternative implementations, it is also possible to directly detect the oscillating voltage signal generated by the oscillating circuit 33 without dividing the voltage by resistors.

Optionally, a rectifying diode D1 is further disposed between the first end of the inductor L and the first resistor R1, and an anode end of the rectifying diode D1 is connected to the first end of the inductor L. The negative half-period signal is filtered through the rectifying diode D1, so that signal acquisition is facilitated; in alternative implementations, the negative half-cycle signal may be filtered out by software.

Optionally, the two ends of the second resistor R2 may be connected in parallel TO a capacitor, so that the voltage at the to_mcu point is in a stable state.

Based on the structure and circuitry of the aerosol-generating device described above, the controller is configured to send a first pulse signal to drive the oscillating circuit 33 to produce damped oscillations; detecting an oscillating voltage signal generated by the oscillating circuit 33; and determining that the aerosol-generating article 100 is received in the chamber 20 or removed from the chamber 20 based on the oscillating voltage signal.

Specifically, as shown in fig. 6, the first pulse signal (e.g., high level signal) output by the controller is processed by the driving circuit 31, and then is also a high level signal output through the 3 rd I/O port thereof, and is a low level signal output through the 10 th I/O port thereof; this turns on the first switching transistor Q3 and turns off the second switching transistor Q7. At this time, the oscillation circuit 33 generates damped oscillation and generates an oscillation voltage signal, and the detection port (to_mcu in the drawing) of the controller can refer TO the upper waveform (time on the abscissa and voltage value on the ordinate) in fig. 7 when the aerosol-generating article 100 is not received in the chamber 20.

The duration of the first pulse signal is very short, typically between 1 and 200 μs; preferably, the duration is between 50 and 150. Mu.s; further preferably, the duration is between 80 μs and 150 μs; further preferably, the duration is between 80 and 120. Mu.s. In this example, the duration of the first pulse signal is 100 μs.

In fig. 7, the upper waveform is detected when the detection circuit 34 is not provided with the rectifier diode D1; it is readily appreciated that when the detection circuit 34 is provided with the rectifier diode D1, the negative half-cycle signal in the waveform is filtered out, and the resulting voltages are all 0V or greater, facilitating collection by the controller.

When the aerosol-generating article 100 is received in the chamber 20, the Q factor (quality factor) will change due to the inductive coupling of the susceptor 103 with the inductor L, thereby causing a faster decay of the oscillating voltage signal output by the oscillating circuit 33. When the aerosol-generating article 100 is received in the chamber 20, the oscillating voltage signal detected by the detection port (to_mcu in the figure) of the controller via the detection circuit 34 may refer TO the lower waveform (time on the abscissa and voltage value on the ordinate) in fig. 7.

Based on the above principle, the peak voltage is determined from the detected oscillating voltage signal, for example: the peak of one of the half-waves in the positive half-cycle, in turn, determines whether the aerosol-generating article 100 is received in the chamber 20 or is removed from the chamber 20.

In an example, the controller is configured to compare the peak voltage to a preset threshold voltage; the aerosol-generating article 100 is determined to be received in the chamber 20 or removed from the chamber 20 based on the comparison result. The preset threshold voltage may be obtained by measurement or experiment. Taking the lower waveform of fig. 7 as an example, the peak voltage of the nth half-wave of a sampling period may be determined, and the peak voltage compared to a predetermined threshold voltage, to thereby determine whether the aerosol-generating article 100 is received in the chamber 20 or removed from the chamber 20. It is easily conceivable that in order to make the comparison result more accurate, it may be determined that the aerosol-generating article 100 is received in the chamber 20 or removed from the chamber 20 from a plurality of comparison results.

In an example, the controller is configured to determine an amount of change or a rate of change of the peak voltage from the peak voltage; the aerosol-generating article 100 is determined to be received in the chamber 20 or removed from the chamber 20 according to the amount or rate of change of the peak voltage. Still taking the following waveforms in fig. 7 as an example, the peak voltages of M consecutive half-waves of one sampling period may be determined, the amount or rate of change of the peak voltages of two half-waves of the M may be calculated, and the amount or rate of change may be compared with a preset value (a preset amount of change threshold or a preset rate of change threshold) to determine whether the aerosol-generating article 100 is received in the chamber 20 or removed from the chamber 20.

In further implementations, inflection point detection methods may be employed, such as: the rate of change of the peak voltage for each of the plurality of sampling periods is determined and then a determination is made as to whether an abrupt change in the rate of change occurs for an adjacent sampling period, thereby determining whether the aerosol-generating article 100 is received in the chamber 20 or is removed from the chamber 20.

In an example, the controller is configured to determine an average or accumulated value of the peak voltages from the peak voltages; determining that the aerosol-generating article is received in or removed from the chamber based on an average or accumulated value of the peak voltage. Still taking the following waveforms of fig. 7 as an example, the peak voltages of M consecutive half-waves of a sampling period may be determined, an average or accumulated value of the peak voltages of M half-waves may be calculated (several values may also be selected from the M values), and the average or accumulated value may be compared with a preset value (a preset average threshold or a preset accumulated value threshold), thereby determining that the aerosol-generating article 100 is received in the chamber 20 or removed from the chamber 20.

Upon determining that the aerosol-generating article 100 is received in the chamber 20, heating may be automatically initiated. That is, the 3 rd and 10 th I/O ports output the second pulse signal to drive the first switching tube Q3 and the second switching tube Q4 to be alternately turned on or off, so as to form an alternating current flowing through the inductor L, thereby generating an alternating magnetic field by the inductor L to induce the susceptor 103 to generate heat. Wherein the frequency of the first pulse signal is smaller than the frequency of the second pulse signal.

Upon determining that the aerosol-generating article 100 is removed from the chamber 20, the heating may be stopped.

In an example, the controller further comprises a timer;

the controller is further configured to control the timer to start timing and start detecting the oscillating voltage signal when the first pulse signal is output; when the timing time of the timer reaches a preset time threshold, the detection of the oscillating voltage signal is stopped, and then the aerosol-generating article 100 is determined to be received in the chamber 20 or removed from the chamber 20 according to the detected oscillating voltage signal.

In this example, the preset time threshold is less than the duration of the first pulse signal.

Fig. 8 is a schematic diagram of a control method of an aerosol-generating device according to an embodiment of the present application. The aerosol-generating device is in accordance with the foregoing and will not be described in detail herein.

The method comprises the following steps:

step S10, a first pulse signal is sent to drive an oscillating circuit to generate damped oscillation;

step S11, detecting an oscillating voltage signal generated by the oscillating circuit;

step S12, determining that the aerosol-generating article is received in or removed from the chamber based on the oscillating voltage signal.

In an example, the determining that the aerosol-generating article is received in or removed from the chamber according to the oscillating voltage signal comprises:

determining a peak voltage from the detected oscillating voltage signal;

determining from the peak voltage that the aerosol-generating article is received in or removed from the chamber.

In an example, the determining that the aerosol-generating article is received in or removed from the chamber according to the peak voltage comprises:

comparing the peak voltage with a preset threshold voltage;

determining from the comparison that the aerosol-generating article is received in or removed from the chamber.

In an example, the determining that the aerosol-generating article is received in or removed from the chamber based on the peak voltage comprises:

determining the variation or the variation rate of the peak voltage through the peak voltage;

determining that the aerosol-generating article is received in or removed from the chamber according to an amount or rate of change of the peak voltage.

In an example, the method further comprises:

the determining that the aerosol-generating article is received in or removed from the chamber as a function of the peak voltage comprises:

determining an average or accumulated value of the peak voltages from the peak voltages;

determining that the aerosol-generating article is received in or removed from the chamber based on an average or accumulated value of the peak voltage.

In an example, the method further comprises:

when a first pulse signal is output, a timer is controlled to start timing and the oscillation voltage signal is detected; when the timing time of the timer reaches a preset time threshold, the detection of the oscillating voltage signal is stopped, and then the aerosol-generating article is determined to be received in or removed from the chamber according to the detected oscillating voltage signal.

The control procedure of the aerosol-generating device is illustrated below in connection with fig. 9:

step S21, the controller outputs a first pulse signal and starts timing;

the function of whether the aerosol-generating article 100 is received in the chamber 20 may be initiated by a timed wake-up function.

Step S22, the controller detects an oscillating voltage signal output by the oscillating circuit 33 through the detecting circuit 34;

step S23, the controller acquires the timing time of the timer and judges whether the timing time exceeds a preset time threshold; if the preset time threshold is not exceeded, continuing to execute the step S22;

step S24, if the preset time threshold is exceeded, stopping detecting the oscillating voltage signal;

step S25, the controller determines peak voltage according to the detected oscillation voltage signal;

step S26, the controller judges whether the peak voltage is smaller than or equal to a preset threshold voltage; if the peak voltage is greater than the preset threshold voltage, it may be determined that the aerosol-generating article 100 is not received in the chamber 20; continuing to execute the step S21;

step S27, if the peak voltage is less than or equal to the preset threshold voltage, determining that the aerosol-generating article 100 is received in the chamber 20;

step S28, heating of the aerosol-generating device is started.

It is noted that in other examples, unlike the examples of fig. 1-9, a susceptor may be provided in the aerosol-generating device, which susceptor is movably received in the chamber 20 together with the aerosol-generating article 100 or is removable from the chamber 20. For example: the susceptor may be provided in an extractor or a heating cartridge (not shown in the drawings) of the aerosol-generating device, which is received in said chamber 20 together with the aerosol-generating article 100 or is removed from said chamber 20; in this way, when the extractor or heating cartridge is received or inserted into the chamber 20 with the aerosol-generating article 100, the controller may determine that the aerosol-generating article 100 is received in the chamber 20 in the manner described above, thereby enabling heating of the aerosol-generating device; and vice versa.

The examples of fig. 1 to 9 are all described by electromagnetic heating. Unlike the above examples, in other examples, resistive heating, infrared heating, etc. may be used; in this case, the aerosol-generating device may also comprise a separate heating element, while the susceptor, oscillating circuit, etc. are merely used for detection of the aerosol-generating article; the heating element may be inserted into the aerosol-generating article for heating or may be placed on the periphery of the aerosol-generating article for heating.

It should be noted that the description and drawings of the present application show preferred embodiments of the present application, but the present application may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are not to be construed as additional limitations on the content of the present application, but are provided for the purpose of providing a more thorough understanding of the present disclosure. The above-described features are further combined with each other to form various embodiments not listed above, and are considered to be the scope described in the present specification; further, modifications and variations of the present invention may occur to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be within the scope of the appended claims.

Claims

1. An aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; characterized by comprising the following steps:

2. An aerosol-generating device according to claim 1, further comprising a detection circuit comprising a first resistor and a second resistor connected in series between one end of the inductor and a first electrode of a power supply;

the controller is configured to detect the oscillating voltage signal by the detection circuit.

3. An aerosol-generating device according to claim 2, wherein the detection circuit further comprises a rectifier diode;

the rectifier diode is connected between one end of the inductor and the first resistor, or between one end of the inductor and the second resistor.

4. An aerosol-generating device according to claim 1, further comprising a switching circuit configured to receive the pulse signal and to conduct an electrical connection between the oscillating circuit and a power supply upon receipt of the pulse signal.

5. An aerosol-generating device according to claim 4, wherein the switching circuit comprises a first switching tube and a second switching tube connected in series, the capacitor comprising a first capacitor and a second capacitor;

the first end of the first capacitor is connected with the second electrode of the power supply, and the second end of the first capacitor is connected with the first end of the second capacitor; the second end of the second capacitor is connected with the first electrode of the power supply;

the first end of the inductance coil is connected with the second end of the first capacitor, and the second end of the inductance coil is connected with the second electrode through the first switch tube and the first electrode through the second switch tube.

6. An aerosol-generating device according to claim 4, wherein the controller is further configured to control the switching circuit to alternately turn on and off such that the inductor flows an alternating current and generates a varying magnetic field;

the susceptor is configured to be penetrated by a varying magnetic field to generate heat to heat the aerosol-generating article.

7. An aerosol-generating device according to claim 1, wherein the controller further comprises a timer;

the controller is further configured to control the timer to start timing and start detecting the oscillating voltage signal when the pulse signal is transmitted; when the timing time of the timer reaches a preset time threshold, the detection of the oscillating voltage signal is stopped, and then the aerosol-generating article is determined to be received in or removed from the chamber according to the detected oscillating voltage signal.

8. An aerosol-generating device according to claim 7, wherein the preset time threshold is less than the duration of the pulse signal.

9. Aerosol-generating device according to claim 1, characterized in that the pulse signal has a duration of between 1 and 200 μs.

10. An aerosol-generating device, comprising:

further comprises:

11. A method of controlling an aerosol-generating device, the method comprising:

detecting an oscillating voltage signal generated by the oscillating circuit;

12. A method according to claim 11, wherein said determining, from the oscillating voltage signal, that an aerosol-generating article is received in or removed from the chamber comprises:

determining a peak voltage from the detected oscillating voltage signal;

13. A method according to claim 12, wherein the determining from the peak voltage that the aerosol-generating article is received in or removed from the chamber comprises:

comparing the peak voltage with a preset threshold voltage;

14. A method according to claim 12, wherein the determining from the peak voltage that the aerosol-generating article is received in or removed from the chamber comprises:

15. A method according to claim 12, wherein the determining from the peak voltage that the aerosol-generating article is received in or removed from the chamber comprises:

16. A method of controlling an aerosol-generating device, the method comprising:

transmitting a pulse signal having a first frequency to detect an oscillating voltage signal generated by an oscillating circuit, determining from the oscillating voltage signal that an aerosol-generating article is received in or removed from the chamber; the pulse signal with the first frequency is used for driving the oscillating circuit to generate damped oscillation;

upon determining that the aerosol-generating article is received in the chamber, transmitting a pulse signal having a second frequency to begin heating the aerosol-generating article; wherein the first frequency is less than the second frequency.