Aerosol provision device
The aerosol provision device addresses inconsistent heating in heat-not-burn products by dynamically adjusting the heating profile based on the heating arrangement's temperature, ensuring consistent and high-quality aerosol generation.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- NICOVENTURES TRADING LTD
- Filing Date
- 2024-11-08
- Publication Date
- 2026-05-15
AI Technical Summary
Existing smoking alternatives, such as heat-not-burn products, struggle with inconsistent heating profiles that can lead to reduced aerosol production, delayed aerosol generation, or undesirable taste due to improper temperature control of the heating arrangement.
An aerosol provision device with a control arrangement that determines and adjusts the heating profile based on the initial temperature of the heating arrangement, allowing for precise power control in multiple phases to achieve and maintain optimal temperatures for aerosol generation.
Ensures consistent and high-quality aerosol production by adapting the heating profile to the initial temperature of the heating arrangement, preventing overheating or underheating, and maintaining desired temperature settings throughout the heating process.
Smart Images

Figure CN2024130987_15052026_PF_FP_ABST
Abstract
Description
Aerosol Provision DeviceTechnical Field
[0001] The present disclosure relates to an aerosol provision device, an aerosol provision system and a method of controlling an aerosol provision device.Background Art
[0002] Smoking articles such as cigarettes, cigars and the like burn tobacco during use to create tobacco smoke. Attempts have been made to provide alternatives to these articles by creating products that release compounds without combusting. Examples of such products are so-called “heat not burn” products or tobacco heating devices or products, which release compounds by heating, but not burning, material. The material may be, for example, tobacco or other non-tobacco products, which may or may not contain nicotine.
[0003] Summary of the Disclosure
[0004] According to a first aspect, there is provided an aerosol provision device, comprising:
[0005] a heating arrangement; and
[0006] a control arrangement configured to:
[0007] determine a temperature of the heating arrangement; and
[0008] control power provided to the heating arrangement;
[0009] wherein, when a heating session is initiated, the aerosol provision device is configured to operate in a first heating phase;
[0010] wherein, in the first heating phase, the control arrangement is configured to:
[0011] determine, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement; and
[0012] provide power to the heating arrangement in accordance with the determined heating profile.
[0013] In some embodiments, the heating profile comprises power to be applied to the heating arrangement.
[0014] In some embodiments, the aerosol provision device is configured to operate in a second heating phase, following the first heating phase, in which the control arrangement is configured to:
[0015] determine the temperature of the heating arrangement continuously or at predetermined intervals; and
[0016] provide power to the heating arrangement to maintain the heating arrangement at a second phase target temperature.
[0017] In some embodiments, the aerosol provision device may be configured to operate in an intermediate heating phase, between the first heating phase and second heating phase. In some embodiments, the aerosol provision device may be configured to operate in a further heating phase, following the second heating phase. In the intermediate heating phase and / or the further heating phase, the control arrangement may be configured to supply power to the heating arrangement in accordance with a heating profile. The heating profile may be different to the heating profile in the first heating phase.
[0018] In some embodiments, the second phase target temperature is pre-defined. In some embodiments, the second phase target temperature is a substantially constant temperature throughout the second heating phase. In other embodiments, the second phase target temperature is varied throughout the second heating phase.
[0019] In some embodiments, the aerosol provision device is configured to operate in the first heating phase for a first predetermined period of time and wherein the control arrangement is configured to provide power to the heating arrangement in accordance with the determined heating profile for the first predetermined period of time.
[0020] In some embodiments, the first predetermined period of time is at least 1 millisecond, optionally at least 10 milliseconds, optionally at least 100 milliseconds, optionally at least 1 second, optionally at least 5 seconds.
[0021] In some embodiments, the first predetermined period of time is less than 20 seconds, optionally less than 15 seconds, optionally less than 12 seconds, optionally less than 10 seconds.
[0022] In some embodiments, the control arrangement comprises a plurality of heating profiles stored thereon and wherein determining the heating profile to be provided to the heating arrangement comprises selecting one of the plurality of heating profiles or generating an interpolated heating profile based on an interpolation between two of the plurality of heating profiles. Where selection or interpolation is described anywhere herein, the device may be configured to only perform selection, only perform interpolation or be capable of performing both selection and interpolation. The same applies to any methods described herein.
[0023] In some embodiments, each of the plurality of heating profiles, or the interpolated heating profile, comprises a series of heating powers.
[0024] In some embodiments, each of the heating powers has an associated time period over which the associated heating power is to be applied to the heating arrangement.
[0025] In some embodiments, the associated time periods are the same for each heating power, e.g. 1 second, or wherein at least some of the associated time periods are different.
[0026] In some embodiments, each of the plurality of heating profiles or the interpolated heating profile is configured to provide a different total amount of power to the heating arrangement over a given time period.
[0027] In some embodiments, the given time period is the first predetermined period of time.
[0028] In some embodiments, each of the plurality of heating profiles comprises an associated temperature, wherein the associated temperature is representative of a temperature of the heating arrangement; or
[0029] wherein each of the plurality of heating profiles comprises an associated temperature difference, wherein the associated temperature difference is representative of a difference between the determined temperature of the heating arrangement and a first phase target temperature of the heating arrangement.
[0030] In some embodiments, each of the plurality of heating profiles comprises an associated temperature, and wherein the total power provided to the heating arrangement by each of the plurality of heating profiles is inversely proportional to the total power provided by other heating profiles according to their respective associated temperatures; or
[0031] wherein each of the plurality of heating profiles comprises an associated temperature difference, and wherein the total power provided to the heating arrangement by each of the plurality of heating profiles is proportional to the total power provided by other heating profiles according to their respective associated temperature differences.
[0032] In some embodiments, determining, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement comprises:
[0033] comparing the determined temperature to at least one of the associated temperatures of the plurality of heating profiles; and
[0034] at least one of:
[0035] selecting the heating profile having an associated temperature that is most similar to the determined temperature of the heating arrangement; or
[0036] selecting the heating profile having an associated temperature that is smaller than and most similar to the determined temperature of the heating arrangement; or
[0037] selecting the heating profile having an associated temperature that is larger than and most similar to the determined temperature of the heating arrangement; or
[0038] interpolating between the heating values of the two heating profiles having associated temperatures that are most similar to the determined temperature of the heating arrangement.
[0039] In some embodiments, determining, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement comprises:
[0040] determining a difference between the determined temperature and the first phase target temperature and comparing the determined difference to the associated temperature difference of at least one of the plurality of heating profiles; and
[0041] at least one of:
[0042] selecting the heating profile having an associated temperature difference that is most similar to the determined difference; or
[0043] selecting the heating profile having an associated temperature difference that is smaller than and most similar to the determined temperature of the heating arrangement; or
[0044] selecting the heating profile having an associated temperature difference that is larger than and most similar to the determined temperature of the heating arrangement; or
[0045] interpolating between the heating values of the two heating profiles having associated temperature differences that are most similar to the determined difference.
[0046] In some embodiments, the control arrangement is configured to determine the temperature of the heating arrangement when a heating session is initiated.
[0047] In some embodiments, the control arrangement is configured to determine the temperature of the heating arrangement continuously or at predetermined intervals and when a heating session is initiated, the control arrangement is configured to select, based on the determined temperature of the heating arrangement, a heating profile from the plurality of heating profiles.
[0048] In some embodiments, each of the plurality of heater profiles or the interpolated heater profile is configured such that, when power is provided to the heating arrangement in accordance with the selected heating profile or interpolated heating profile, the heating arrangement reaches the first phase target temperature after the same predetermined time period (irrespective of which heating profile or interpolated heating profile is applied) .
[0049] In some embodiments, the predetermined time period is less than 20 seconds, optionally less than 15 seconds, optionally less than 12 seconds, optionally less than 10 seconds.
[0050] In some embodiments, the first phase target temperature is a temperature suitable for generating aerosol from an aerosol generating material.
[0051] In some embodiments, the first phase target temperature is at least 200 degrees Celsius, optionally at least 300 degrees Celsius, optionally at least 350 degrees Celsius, optionally at least 500 degrees Celsius, optionally at least 600 degrees Celsius, optionally at least 700 degrees Celsius, optionally at least 800 degrees Celsius, optionally at least 900 degrees Celsius, optionally at least 1000 degrees Celsius.
[0052] In some embodiments, determining a heating profile to be applied to the heating arrangement based on the determined temperature comprises determining a heating profile based on a rate of change of temperature of the heating arrangement. The rate of change may be determined based on the determined temperature, e.g. based on multiple determined temperatures.
[0053] In some embodiments, determining, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement comprises:
[0054] comparing the determined temperature of the heating arrangement to a first baseline temperature and a second baseline temperature, wherein the first baseline temperature is smaller than the second baseline temperature; and
[0055] if the determined temperature is between the first baseline temperature and the second baseline temperature, selecting a baseline heating profile from the plurality of heating profiles; or
[0056] if the determined temperature is greater than the second baseline temperature, selecting or interpolating a heating profile in which the total power provided to the heating arrangement is decreased compared to the baseline heating profile; or
[0057] if the determined temperature is smaller than the first baseline temperature, selecting or interpolating a heating profile in which the total power provided to the heating arrangement is increased compared to the baseline heating profile.
[0058] In some embodiments, the first baseline temperature is between 18 degrees Celsius and 22 degrees Celsius, optionally between 19 degrees Celsius and 21 degrees Celsius, optionally approximately 20 degrees Celsius.
[0059] In some embodiments, the second baseline temperature is between 24 degrees Celsius and 28 degrees Celsius, optionally between 25 degrees Celsius and 27 degrees Celsius, optionally approximately 26 degrees Celsius.
[0060] In some embodiments, the heating arrangement comprises a heater element.
[0061] In some embodiments, the heater element comprises a resistive heater element, an RF heater element, an air emitting heating element and / or an inductive heater element, e.g. a susceptor.
[0062] In some embodiments, the heating arrangement comprises an infrared heater element.
[0063] In some embodiments, the aerosol generating device comprises a temperature sensor; and
[0064] wherein the control arrangement is configured to determine the temperature of the heating arrangement based on the output of the temperature sensor.
[0065] In some embodiments, the temperature sensor is in contact with at least part of the heating arrangement, e.g. the heater element.
[0066] In some embodiments, the temperature sensor comprises a thermocouple.
[0067] In some embodiments, a heating session is initiated when a user operates a user input element (e.g. a button) on the device.
[0068] According to a second aspect, there is provided an aerosol provision system, comprising:
[0069] an article comprising an aerosol generating material; and
[0070] an aerosol provision device according to the aspect or any embodiment described above.
[0071] According to a third aspect, there is provided a method of controlling an aerosol provision device, comprising:
[0072] when a heating session is initiated, operating the aerosol provision device in a first heating phase;
[0073] wherein the first heating phase comprises:
[0074] determining, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement; and
[0075] providing power to the heating arrangement in accordance with the determined heating profile.
[0076] Any of the embodiments of the first aspect of the invention may equally be applied to the third aspect of the invention discussed above. Some specific embodiments of the third aspect follow below.
[0077] In some embodiments, the heating profile comprises power to be applied to the heating arrangement.
[0078] In some embodiments, the method further comprises operating the aerosol provision device in a second heating phase, following the first heating phase, in which the second heating phase comprises:
[0079] determining the temperature of the heating arrangement continuously or at predetermined intervals; and
[0080] providing power to the heating arrangement to maintain the heating arrangement at a second phase target temperature.
[0081] In some embodiments, the second phase target temperature is pre-defined.
[0082] In some embodiments, the second phase target temperature is a substantially constant temperature throughout the second heating phase. In other embodiments, the second phase target temperature is varied throughout the second heating phase.
[0083] In some embodiments, the method comprises operating the aerosol provision device in the first heating phase for a first predetermined period of time and providing power to the heating arrangement in accordance with the determined heating profile for the first predetermined period of time.
[0084] In some embodiments, the first predetermined period of time is at least 1 millisecond, optionally at least 10 milliseconds, optionally at least 100 milliseconds, optionally at least 1 second, optionally at least 5 seconds.
[0085] In some embodiments, the first predetermined period of time is less than 20 seconds, optionally less than 15 seconds, optionally less than 12 seconds, optionally less than 10 seconds.
[0086] In some embodiments, the step of determining the heating profile to be provided to the heating arrangement comprises selecting one of a plurality of heating profiles or generating an interpolated heating profile based on an interpolation between two of the plurality of heating profiles. The heating profiles may be pre-defined and may be stored, for example, in a control arrangement of the aerosol provision device.
[0087] In some embodiments, each of the plurality of heating profiles, or the interpolated heating profile, comprises a series of heating powers.
[0088] In some embodiments, each of the heating powers has an associated time period over which the associated heating power is to be applied to the heating arrangement.
[0089] In some embodiments, the associated time periods are the same for each heating power, e.g. 1 second, or wherein at least some of the associated time periods are different.
[0090] In some embodiments, each of the plurality of heating profiles or the interpolated heating profile is configured to provide a different total amount of power to the heating arrangement over a given time period.
[0091] In some embodiments, the given time period is the first predetermined period of time.
[0092] In some embodiments, each of the plurality of heating profiles comprises an associated temperature, wherein the associated temperature is representative of a temperature of the heating arrangement; or
[0093] wherein each of the plurality of heating profiles comprises an associated temperature difference, wherein the associated temperature difference is representative of a difference between the determined temperature of the heating arrangement and a first phase target temperature of the heating arrangement.
[0094] In some embodiments, each of the plurality of heating profiles comprises an associated temperature, and wherein the total power provided to the heating arrangement by each of the plurality of heating profiles is inversely proportional to the total power provided by other heating profiles according to their respective associated temperatures; or
[0095] wherein each of the plurality of heating profiles comprises an associated temperature difference, and wherein the total power provided to the heating arrangement by each of the plurality of heating profiles is proportional to the total power provided by other heating profiles according to their respective associated temperature differences.
[0096] In some embodiments, determining, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement comprises:
[0097] comparing the determined temperature to at least one of the associated temperatures of the plurality of heating profiles; and
[0098] at least one of:
[0099] selecting the heating profile having an associated temperature that is most similar to the determined temperature of the heating arrangement; or
[0100] selecting the heating profile having an associated temperature that is smaller than and most similar to the determined temperature of the heating arrangement; or
[0101] selecting the heating profile having an associated temperature that is larger than and most similar to the determined temperature of the heating arrangement; or
[0102] interpolating between the heating values of the two heating profiles having associated temperatures that are most similar to the determined temperature of the heating arrangement.
[0103] In some embodiments, determining, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement comprises:
[0104] determining a difference between the determined temperature and the first phase target temperature and comparing the determined difference to the associated temperature difference of at least one of the plurality of heating profiles; and
[0105] at least one of:
[0106] selecting the heating profile having an associated temperature difference that is most similar to the determined difference; or
[0107] selecting the heating profile having an associated temperature difference that is smaller than and most similar to the determined temperature of the heating arrangement; or
[0108] selecting the heating profile having an associated temperature difference that is larger than and most similar to the determined temperature of the heating arrangement; or
[0109] interpolating between the heating values of the two heating profiles having associated temperature differences that are most similar to the determined difference.
[0110] In some embodiments, the method comprises determining the temperature of the heating arrangement when a heating session is initiated.
[0111] In some embodiments, the method comprises determining the temperature of the heating arrangement continuously or at predetermined intervals and when a heating session is initiated, selecting, based on the determined temperature of the heating arrangement, a heating profile from the plurality of heating profiles.
[0112] In some embodiments, each of the plurality of heating profiles or the interpolated heating profile is configured such that, when power is provided to the heating arrangement in accordance with the selected heating profile or interpolated heating profile, the heating arrangement reaches the first phase target temperature after the same predetermined time period.
[0113] In some embodiments, the predetermined time period is less than 20 seconds, optionally less than 15 seconds, optionally less than 12 seconds, optionally less than 10 seconds.
[0114] In some embodiments, the first phase target temperature is a temperature suitable for generating aerosol from an aerosol generating material.
[0115] In some embodiments, the first phase target temperature is at least 200 degrees Celsius, optionally at least 300 degrees Celsius, optionally at least 350 degrees Celsius, optionally at least 500 degrees Celsius, optionally at least 600 degrees Celsius, optionally at least 700 degrees Celsius, optionally at least 800 degrees Celsius, optionally at least 900 degrees Celsius, optionally at least 1000 degrees Celsius.
[0116] In some embodiments, determining a heating profile to be applied to the heating arrangement based on the determined temperature comprises determining a heating profile based on a rate of change of temperature of the heating arrangement. The rate of change may be determined based on the determined temperature, e.g. based on multiple determined temperatures.
[0117] In some embodiments, determining, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement comprises:
[0118] comparing the determined temperature of the heating arrangement to a first baseline temperature and a second baseline temperature, wherein the first baseline temperature is smaller than the second baseline temperature; and
[0119] if the determined temperature is between the first baseline temperature and the second baseline temperature, selecting a baseline heating profile from the plurality of heating profiles; or
[0120] if the determined temperature is greater than the second baseline temperature, selecting or interpolating a heating profile in which the total power provided to the heating arrangement is decreased compared to the baseline heating profile; or
[0121] if the determined temperature is smaller than the first baseline temperature, selecting or interpolating a heating profile in which the total power provided to the heating arrangement is increased compared to the baseline heating profile.
[0122] In some embodiments, the first baseline temperature is between 18 degrees Celsius and 22 degrees Celsius, optionally between 19 degrees Celsius and 21 degrees Celsius, optionally approximately 20 degrees Celsius.
[0123] In some embodiments, the second baseline temperature is between 24 degrees Celsius and 28 degrees Celsius, optionally between 25 degrees Celsius and 27 degrees Celsius, optionally approximately 26 degrees Celsius.Brief Description of the Drawings
[0124] Various embodiments will now be described, by way of example only, with reference to the accompanying drawings in which:
[0125] Figure 1 is a schematic diagram of an aerosol provision system in accordance with an embodiment;
[0126] Figure 2 is a cross-sectional view of a heater element of an aerosol provision device in accordance with an embodiment;
[0127] Figures 3 to 5 are flow charts showing methods of controlling an aerosol provision device in accordance with an embodiment;
[0128] Figure 6a is a table of heating profiles in accordance with an embodiment;
[0129] Figure 6b is a plot showing power being applied in accordance with a heating profile for one of the heating profiles of Figure 6a;
[0130] Figures 7a and 7b are tables showing heating profiles in accordance with another embodiment;
[0131] Figure 8 is a plot showing the temperature over time of a heating arrangement in accordance with an embodiment; and
[0132] Figures 9 and 10 are flow charts showing methods of operating an aerosol provision device in accordance with an embodiment.Detailed Description
[0133] As used herein, the term “aerosol-generating material” is a material that is capable of generating aerosol, for example when heated, irradiated or energized in any other way. Aerosol-generating material may, for example, be in the form of a solid, liquid or gel which may or may not contain an active substance and / or flavourants. Aerosol-generating material may include any plant-based material, such as tobacco-containing material and may, for example, include one or more of tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco or tobacco substitutes. Aerosol-generating material also may include other, non-tobacco, products, which, depending on the product, may or may not contain nicotine. Aerosol-generating material may for example be in the form of a solid, a liquid, a gel, a wax or the like. Aerosol-generating material may for example also be a combination or a blend of materials. Aerosol-generating material may also be known as “smokable material” .
[0134] The aerosol-generating material may comprise a binder and an aerosol former. Optionally, an active and / or filler may also be present. Optionally, a solvent, such as water, is also present and one or more other components of the aerosol-generating material may or may not be soluble in the solvent. In some embodiments, the aerosol-generating material is substantially free from botanical material. In some embodiments, the aerosol-generating material is substantially tobacco free.
[0135] The aerosol-generating material may comprise or be an “amorphous solid” . The amorphous solid may be a “monolithic solid” . In some embodiments, the amorphous solid may be a dried gel. The amorphous solid is a solid material that may retain some fluid, such as liquid, within it. In some embodiments, the aerosol- generating material may, for example, comprise from about 50wt%, 60wt%or 70wt%of amorphous solid, to about 90wt%, 95wt%or 100wt%of amorphous solid.
[0136] The aerosol-generating material may comprise an aerosol-generating film. The aerosol-generating film may comprise or be a sheet, which may optionally be shredded to form a shredded sheet. The aerosol-generating sheet or shredded sheet may be substantially tobacco free.
[0137] According to the present disclosure, a “non-combustible” aerosol provision system (sometimes referred to as “an aerosol provision system” ) is one where a constituent aerosol-generating material of the aerosol provision system (or component thereof) is not combusted or burned in order to facilitate delivery of at least one substance to a user.
[0138] In some embodiments, the delivery system is a non-combustible aerosol provision system, such as a powered non-combustible aerosol provision system.
[0139] In some embodiments, the non-combustible aerosol provision system is an electronic cigarette, also known as a vaping device or electronic nicotine delivery system (END) , although it is noted that the presence of nicotine in the aerosol-generating material is not a requirement.
[0140] In some embodiments, the non-combustible aerosol provision system is an aerosol-generating material heating system, also known as a heat-not-burn system. An example of such a system is a tobacco heating system.
[0141] In some embodiments, the non-combustible aerosol provision system is a hybrid system to generate aerosol using a combination of aerosol-generating materials, one or a plurality of which may be heated. Each of the aerosol-generating materials may be, for example, in the form of a solid, liquid or gel and may or may not contain nicotine. In some embodiments, the hybrid system comprises a liquid or gel aerosol-generating material and a solid aerosol-generating material. The solid aerosol-generating material may comprise, for example, tobacco or a non-tobacco product.
[0142] Typically, the non-combustible aerosol provision system may comprise a non-combustible aerosol provision device and a consumable (sometimes referred to as an “article” ) for use with the non-combustible aerosol provision device.
[0143] In some embodiments, the disclosure relates to consumables comprising aerosol-generating material and configured to be used with non-combustible aerosol provision devices. These consumables are sometimes referred to as articles throughout the disclosure.
[0144] In some embodiments, the non-combustible aerosol provision system, such as a non-combustible aerosol provision device thereof, may comprise a power source (e.g. an energy storage device) and a controller. The power source may, for example, be an electric power source or an exothermic power source. In some embodiments, the exothermic power source comprises a carbon substrate which may be energised so as to distribute power in the form of heat to an aerosol-generating material or to a heat transfer material in proximity to the exothermic power source.
[0145] In some embodiments, the non-combustible aerosol provision system may comprise an area for receiving the consumable, an aerosol generator, an aerosol generation area, a housing, a mouthpiece, a filter and / or an aerosol-modifying agent.
[0146] In some embodiments, the consumable for use with the non-combustible aerosol provision device may comprise aerosol-generating material, an aerosol-generating material storage area, an aerosol-generating material transfer component, an aerosol generator, an aerosol generation area, a housing, a wrapper, a filter, a mouthpiece, and / or an aerosol-modifying agent.
[0147] An aerosol generating device can receive an article comprising aerosol generating material for heating. An “article” in this context is a component that includes or contains in use the aerosol generating material, which is heated to volatilise the aerosol generating material, and optionally other components in use. A user may insert the article into the aerosol generating device before it is heated to produce an aerosol, which the user subsequently inhales. The article may be, for example, of a predetermined or specific size that is configured to be placed within a heating chamber of the device which is sized to receive the article.
[0148] Figure 1 is a schematic diagram of an aerosol provision system 2 in accordance with an embodiment of the present invention. The aerosol provision system 2 includes an aerosol provision device 4 (sometimes referred to as the “device 4” ) and an article 6. The article 6 includes an aerosol generating material 8. The aerosol generating material 8 may comprise any suitable material as discussed above, for example tobacco. The aerosol generating material 8 may be in a solid, semi-solid (e.g. gel) or liquid form.
[0149] The aerosol provision device 2 includes a heating arrangement 10. In some embodiments, as depicted, the heating arrangement 10 comprises a heating element 14. The device 4 may further comprise an article receiving portion 12, which may be in the form of a chamber or cavity within a housing of the device 4, as shown in Figure 1. The article 6 may be at least partially received within article receiving portion 10 during use of the system 2. In some embodiments, the heater element 10 comprises a resistive heater element, an RF heater element, an air emitting heating element and / or an inductive heater element, e.g. a susceptor. In embodiments wherein the heater element 14 comprises a susceptor, the device 4 may further comprise an inductor coil (not shown) configured to generate a magnetic field for inductive heating of the susceptor.
[0150] When the aerosol generating article 6 is located in the article receiving portion 12, the heating element 14 is inserted into the aerosol generating material 8, such that the aerosol generating material 8 is heated. The heater element 14 may comprise a pin-shaped heater element as depicted in Figure 1. However, the heater element 14 depicted in Figure 1 is merely intended for illustration purposes and the heater element 14 may have any other suitable form. For example, the heater element 14 may instead be in the form of a cylindrical tube which extends around the outside of the article 6 when received in the article receiving portion 10.
[0151] The aerosol provision device 4 further includes a control arrangement 16 for controlling operation of the device 4. The control arrangement 16 may be in the form of, or comprise, a controller. In some embodiments, as depicted, the device 4 may further comprise at least one of: a power source 18, e.g. in the form of a battery or capacitor, a temperature sensor 20 and a user input element 22. The control arrangement 16 may be in operative communication with each of the heating arrangement 10, the battery 18, the temperature sensor 20 and the user input element 22. This may be via wired or wireless means.
[0152] The power source 18 may be used to provide power to the heating arrangement 10. The control arrangement 16 may be configured to control the supply of power from the power source 18 to the heating arrangement 10.
[0153] The user input element 22 may be any suitable and desired type. In some embodiments, the user input element 22 comprises a button. The user input element 22 may be configured to provide an output to the control arrangement 16. Operation of the user input element 22 may control any suitable operation of the device 4. For example, in some embodiments, a heating session (i.e. the provision of heat by the heating arrangement 10 and thus the heating of the article 6) may be initiated when a user operates the user input element 22.
[0154] In embodiments which comprise the temperature sensor 20, the temperature sensor 20 may be configured to determine the temperature of at least part of the heating arrangement 10. In some embodiments, the temperature sensor is in contact with at least part of the heating arrangement 10, e.g. the heater element 14. In this embodiment shown in Figure 1, the temperature sensor 20 is in thermal contact with the heater element 14. However, the temperature sensor 20 need not necessarily be in direct thermal contact with the heating arrangement 10, but may nonetheless determine the temperature of the heating arrangement 10. For example, the temperature sensor 20 may be arranged to monitor the temperature of another part of the device 4 which has a temperature which is related to the temperature of the heating arrangement 10. This may allow indirect determination of the temperature of the heating arrangement 10.
[0155] The temperature sensor 20 may be any suitable and desired type. In some embodiments, the temperature sensor 20 comprises a thermocouple. In other embodiments, the temperature sensor comprises a thermistor or any other suitable temperature sensor. The temperature sensor 20 may be configured to provide an output to the control arrangement 16.
[0156] The control arrangement 16 is configured to control the aerosol provision device 2. In particular, the control arrangement 16 is configured to control the power provided to the heating arrangement 10 based on a determined temperature of the heating arrangement 10. The temperature of the heating arrangement 10 may be determined in any suitable and desired way. For example, in some embodiments, the temperature of the heating arrangement 10 may be determined based on the output of the temperature sensor 20 described above. Use of the temperature sensor 20 is not necessarily essential, particularly for some forms of heating arrangement. For example, in embodiments wherein the heating arrangement 10 comprises a heater element 14 comprising a susceptor, the temperature of the heating arrangement 10 may be determined based on the resonant frequency of the heating element 14.
[0157] In some embodiments, the control arrangement 16 is configured to determine the temperature of the heating arrangement 10 at least when a heating session is initiated (e.g. when a user operates the user input element 22) . In other words, a user may operate the user input element 22, and the control arrangement 16 may then take a temperature measurement of the heating arrangement 10, e.g. using the temperature sensor 20. This temperature measurement may then be used in subsequent control. In some embodiments, the control arrangement 16 is configured to determine the temperature of the heating arrangement 10 continuously or at predetermined intervals (e.g. before a heating session is initiated) . In such embodiments, when a heating session is initiated, the control arrangement 16 may utilise the last recorded temperature measurement rather than necessarily obtaining a further temperature measurement following initiation.
[0158] When a heating session is initiated, the aerosol provision device 2 is configured to operate in a first heating phase. In the first heating phase, the control arrangement 16 is configured to: determine, based on a determined temperature of the heating arrangement 10, a heating profile to be provided to the heating arrangement 10; and provide power to the heating arrangement 10 in accordance with the determined heating profile. The advantage of this determination of the heating profile in dependence of the determined temperature is discussed below in relation to Figure 3.
[0159] In some embodiments, as depicted in Figure 1, the control arrangement 16 comprises a memory 24. The memory 24 may have a plurality of heating profiles stored thereon. Determining the heating profile to be provided to the heating arrangement may include selecting one of the plurality of heating profiles stored on the memory 24. Examples of such heating profiles are discussed in more detail below with reference to later Figures. However, it will be appreciated that selecting from pre-stored heating profiles stored on the memory 24 is not essential and in other embodiments the control arrangement 16 may instead generate a heating profile to be applied. This may be achieved, for example, using pre-established formula.
[0160] In some embodiments, the control arrangement 16 includes a processor 26. The processor 26 may be configured to select the appropriate heating profile and / or perform calculations, such as generating an interpolated heating profile based on an interpolation between two of the plurality of heating profiles (e.g. the heating profiles stored on the memory 24) . Such interpolation is discussed in more detail below in relation to later Figures.
[0161] Figure 2 is a cross-sectional view of a heater element 14 of an aerosol provision device 4 in accordance with an embodiment of the present invention. In this embodiment, the heater element 14 is an infrared heater element. The heater element 14 comprises a heater coil 28 and a housing 30. The heater coil 28 may receive power (e.g. from the power source 18) through an electrical connection 32. The heater coil 28 and / or the housing 30 may be configured to emit infrared radiation, e.g. in order to heat the article 6 comprising the aerosol generating material 8.
[0162] In the embodiment shown in Figure 1, the temperature sensor 20 is in thermal contact with the base of the heater element 14. A corresponding first temperature sensor 20a is shown in Figure 2. In some embodiments, a second temperature sensor 20b is located adjacent to the base of the heater coil 28. In some embodiments, a third temperature sensor 20c is located towards the top of the heater coil 28 (e.g. proximal to the location of maximum temperature of the heater coil 28) . It will be understood that in some embodiments, only one temperature sensor may be used. In some examples, the first temperature sensor 20a may be the only temperature used. The first to third temperature sensors 20a-20c may be arranged within the housing 30. In some embodiments, there may be differences in temperature across the heating arrangement. Therefore, one or more of the temperature sensors 20a-20c may provide different determined values of the temperature of the heating arrangement. The number of and location of the temperature sensor (s) may be selected according to the requirements of the system.
[0163] Figure 3 is a flow chart of a method of controlling an aerosol provision device. Reference will be made to the aerosol provision device 4 described above, although it will be appreciated that the method may be applied to any suitable aerosol provision device. The method comprises the step 101 of, when a heating session is initiated, operating the aerosol provision device 4 in a first heating phase. The first heating phase comprises the step 102 of determining, based on a determined temperature of the heating arrangement 10, a heating profile to be provided to the heating arrangement 10. The first heating phase comprises the step 103 of providing power to the heating arrangement 10 in accordance with the determined heating profile. In prior art aerosol provision devices, the same heating profile is applied to the heating arrangement irrespective of the initial temperature of the heating arrangement. In such devices, if the initial temperature of the heating arrangement was lower than expected, the heating profile applied to the heating arrangement may not cause the heating arrangement to reach the desired temperature. This may lead to a reduction in the amount of aerosol produced, a delay in aerosol being produced, and / or a reduction in the quality of aerosol being produced. If the initial temperature of the heating arrangement was higher than expected, e.g. due to heating starting shortly after a previous heating session, the heating power applied to the heating arrangement may cause the heating arrangement to reach a temperature which exceeds a desired temperature. This may lead to a reduction in the quality of aerosol being produced (e.g. the aerosol generating material may have been burnt, leading to an undesirable taste) .
[0164] In contrast, embodiments of the present invention provide an aerosol provision device, an aerosol provision system and a method whereby the heating profile to be provided to the heating arrangement is determined according to a determined (initial) temperature of the heating arrangement. The heating profile applied to the heating arrangement may thus be adapted in dependence on the starting temperature of the heating arrangement. This may help to ensure that the heating arrangement is heated appropriately, e.g. a suitable heating power is applied to reach substantially the same desired temperature (e.g. first phase target temperature) irrespective of the initial temperature of the heating arrangement. This may help to ensure that aerosol is generated from the aerosol generating material as desired.
[0165] In some embodiments, the aerosol provision device 4 is configured to operate in the first heating phase for a first predetermined period of time and the control arrangement 16 is configured to provide power to the heating arrangement in accordance with the determined heating profile for the first predetermined period of time. In some embodiments, the first predetermined period of time is at least 1 millisecond, optionally at least 10 milliseconds, optionally at least 100 milliseconds, optionally at least 1 second, optionally at least 5 seconds. In some embodiments, the first predetermined period of time is less than 20 seconds, optionally less than 15 seconds, optionally less than 12 seconds, optionally less than 10 seconds.
[0166] Figure 4 is a flow chart of a method of controlling an aerosol provision device in accordance with an embodiment. In particular, the flow chart is a method of operating an aerosol provision device in a second heating phase, following the first heating phase. Again, reference will be made to the aerosol provision device 4 described above, although it will be appreciated that the method may be applied to any suitable aerosol provision device. In the second heating phase a first step 201 comprises determining the temperature of the heating arrangement continuously or at predetermined intervals e.g. using the control arrangement 16. In a second step 202, the second heating phase comprises providing power to the heating arrangement 10 to maintain the heating arrangement 10 at a second phase target temperature. This second phase target temperature may be a temperature suitable for generating an aerosol from the aerosol generating material 8 of the article 6. The second heating phase may comprise a control loop comprising temperature determination, as in step 201, followed by power adjustment, as in step 202. This control loop may be repeated for the duration of the second heating phase. In embodiments, the aerosol provision device 4 is operated in two phases, a first phase, whereby the heating arrangement 10 is supplied with power based on a temperature determined when a heating session is initiated, and then a second phase whereby the power is controlled to keep the temperature of the heating arrangement 10 maintained at the second phase target temperature. This will be discussed in more detail below.
[0167] In the second heating phase, the temperature may be determined at any suitable and desired interval. For example, the temperature may be determined (substantially) continuously or at predetermined intervals (e.g. once per second) . In some examples, the power provided to the heating arrangement 10 may be updated continuously or at predetermined intervals (e.g. each time that the temperature of the heating arrangement is determined) . This may enable regular adjustment of the power being provided to the heating arrangement, thereby helping to ensure that the temperature of the heating arrangement may be maintained at the second phase target temperature.
[0168] Providing power to the heating arrangement 10 to maintain the heating arrangement at a second phase target temperature may be performed in any suitable and desired way. In some examples, the power to be provided is determined by the control arrangement 16. In some examples, the power to be provided is determined according to proportional-integral-derivative (PID) control.
[0169] In some embodiments, the second phase target temperature is pre-defined. For example, the second phase target temperature may be stored on (e.g. on the memory 24 of) the control arrangement 16. In some embodiments, the second phase target temperature may be substantially constant. In some embodiments, the second phase target temperature comprises a series of temperature values (e.g. such that the second phase target temperature varies over time) .
[0170] The steps of the method of Figure 4 may follow the steps of the method of Figure 3. For example, the steps of the method of Figure 4 may be carried out after the steps of the method of Figure 3 have been carried out and the first predetermined period of time has elapsed.
[0171] Figure 5 is a flow chart of a method of controlling an aerosol provision device, for example the aerosol provision device 4 described above, in accordance with an embodiment. The method will be described with reference to the device 4 described above, although it will be appreciated that the method may be applied to any suitable aerosol provision device. The method includes a first step 301 of a user operating a user input element, e.g. user input element 22. A second step 302 comprises operating the aerosol provision device, e.g. device 4, in a first heating phase for a first predetermined period of time. A third step 303 comprises operating the aerosol provision device in a second heating phase. The first and second heating phases may be as described herein. The third step 303, of operating the aerosol provision device in the second heating phase, may be carried out for any suitable and desired period of time. For example, the aerosol provision device 4 may be operated in the second heating phase for a second predetermined period of time and / or until a user operates a user input element 22 to cease the second heating phase. The aerosol provision device may be operated in the first heating phase when a heating phase is initiated. For an initial period of time after the heating phase is initiated, it may not be possible to obtain accurate feedback relating to the temperature of the heating arrangement 10 (e.g. because the temperature of the heating arrangement 10 is changing rapidly) . Therefore, operating the aerosol provision device in the first heating phase may be preferable because the heating profile is (at least to some extent) predetermined. After the initial period of time has elapsed, it may be possible to obtain accurate feedback relating to the temperature of the heating element. This may facilitate the operation of the aerosol provision device in the second heating phase.
[0172] As described above, in some embodiments, the aerosol provision device 4 may comprise a plurality of heating profiles stored thereon. In some embodiments, the plurality of heating profiles may be determined experimentally (e.g. for all similar aerosol provision devices) and stored on the aerosol provision device (e.g. for future use) . Use of such pre-stored heating profiles may thus ensure that the heating arrangement is heated to a suitable temperature. Figure 6a is a table of exemplary heating profiles. Each row of the table of Figure 6a corresponds to a heating profile. Each heating profile comprises power to be applied to the heating arrangement 10. In some embodiments, a heating profile may be a single heating power. In the exemplary embodiment depicted in Figure 6a, each of the heating profiles includes a series of heating powers. In particular, the heating profiles of this example each include 12 heating powers that are to be applied to the heating arrangement 10.
[0173] In this embodiment, each of the heating powers has an associated time period over which the associated heating power is to be applied to the heating arrangement. In some embodiments, as is the case for the heating profiles shown in Figure 6a, the associated time periods are the same for each heating power (i.e. each of the associated time periods are one second) . However, it will be understood that in some embodiments, at least some of the associated time periods are different.
[0174] Figure 6b is a plot showing heating profile power over time for a single a heating profile. Specifically, the heating profile of Figure 6b is the heating profile of the bottom row of the table of Figure 6a. It can be seen that each of the heating powers is applied for one second, one after another, such that power is applied to the heating arrangement for a total of 12 seconds.
[0175] In some embodiments, the aerosol provision device 4 is configured to operate in the first heating phase for a first predetermined period of time and wherein the control arrangement 16 is configured to provide power to the heating arrangement 10 in accordance with the determined heating profile for the first predetermined period of time. When heating profiles of the form shown in Figure 6a are used, the first predetermined period of time may thus be 12 seconds.
[0176] Returning to Figure 6a, each of the heating profiles may include an associated temperature T and / or an associated temperature difference ΔT. It will be understood that heating profiles in accordance with examples of the present disclosure may include only one of an associated temperature T and associated temperature difference ΔT. It is the associated temperature T and / or the associated temperature difference ΔT which facilitate selection of the heating profile to be used.
[0177] The associated temperature T may be representative of a temperature of the heating arrangement 10. The associated temperature T may represent the temperature of the heating arrangement 10 at which the associated heating profile should be applied.
[0178] In some embodiments, determining, based on a determined temperature of the heating arrangement 10, a heating profile to be provided to the heating arrangement 10 comprises comparing the determined temperature to at least one of the associated temperatures T of the plurality of heating profiles and selecting the heating profile having an associated temperature that is most similar to the determined temperature of the heating arrangement 10. For example, if the temperature of the heating arrangement is determined to be 80 ℃, the heating profile on row 5 may be selected as the associated temperature T (70 ℃) is most similar to the determined temperature. Selecting the heating profile having an associated temperature that is most similar to the determined temperature of the heating arrangement may help to ensure that an appropriate amount of power is provided to the heating arrangement 10, such that the heating arrangement 10 gets as close as possible to the first phase target temperature without significant overshoot, or undershoot.
[0179] In some embodiments, determining, based on a determined temperature of the heating arrangement 10, a heating profile to be provided to the heating arrangement comprises comparing the determined temperature to at least one of the associated temperatures of the plurality of heating profiles and selecting the heating profile having an associated temperature that is smaller than and most similar to the determined temperature of the heating arrangement 10. For example, if the temperature of the heating arrangement is determined to be 200 ℃, the heating profile on row 3 may be selected as the associated temperature T (174 ℃) is smaller than and most similar to the determined temperature. Selecting the heating profile having an associated temperature that is smaller than and most similar to the determined temperature of the heating arrangement may help to ensure that an appropriate amount of power is applied to the heating arrangement, such that the heating arrangement 10 is heated to at least the first phase target temperature. In some embodiments, a heating profile having an associated temperature that is larger than and most similar to the determined temperature of the heating arrangement 10 may be selected. In such embodiments, it will be appreciated that the total power provided to the heating arrangement may be less than a heating profile which is smaller than and most similar to the determined temperature (as in the embodiment discussed immediately above) . Such embodiments may be utilised where it is particularly important not to overheat the heating arrangement 10 and thus the article 6, for example where there is a specific need to control toxicity levels.
[0180] In some embodiments, determining, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement 10 comprises comparing the determined temperature to at least one of the associated temperatures of the plurality of heating profiles and interpolating between the heating values of the two heating profiles having associated temperatures that are most similar to the determined temperature of the heating arrangement 10. This will be discussed in more detail in relation to Figures 7a and 7b.
[0181] In some embodiments, as is the case for the heating profiles depicted in Figure 6a, the total power provided to the heating arrangement 10 by each of plurality of the heating profiles (for the duration of the application of the heating profile, e.g. 12 seconds in the case of Figure 6a) is inversely proportional to the total power provided by other heating profiles according to their respective associated temperatures T. For example, the heating powers of the heating profile on row 5 are each scaled by a factor of 0.95 compared to the heating profiles of row 6. Therefore, the total power applied by the heating profile on row 5 is 5%lower than the total power applied by the heating profile on row 6. This is because the heating profile on row 5 would be applied to a heating arrangement having an initial higher temperature than the heating profile on row 6 (according to their associated temperature T) . The power required to bring a heating arrangement to a desired temperature (e.g. a first phase target temperature) is lower when the heating arrangement has a higher initial temperature (i.e. the temperature of the heating arrangement is closer to the first phase target temperature before any power is applied) . Therefore, scaling the power provided to the heating arrangement according to the associated temperature T may help to ensure that an appropriate amount of power is provided to the heating arrangement 10, such that the heating arrangement 10 gets as close as possible to the first phase target temperature without significant overshoot, or undershoot.
[0182] In some embodiments, as depicted in Figure 6a each of the heating profiles may in addition or alternatively to the associated temperature T, comprise an associated temperature difference ΔT that is representative of a difference between the determined temperature of the heating arrangement 10 and a first phase target temperature of the heating arrangement. The first phase target temperature may be any suitable and desired temperature. In some embodiments, and as is the case in Figure 6a, the first phase target temperature is 822 ℃. The first phase target temperature may be selected as a temperature that is suitable for generating aerosol from an aerosol generating material (when the heating arrangement is heated to the first phase target temperature) .
[0183] The associated temperature difference ΔT may represent the temperature difference of the heating arrangement 10 at which the associated heating profile should be applied.
[0184] In some embodiments, determining, based on a determined temperature of the heating arrangement 10, a heating profile to be provided to the heating arrangement comprises determining a difference between the determined temperature and the first phase target temperature, comparing the determined difference to the associated temperature difference ΔT of at least one of the plurality of heating profiles and selecting the heating profile having an associated temperature difference that is most similar to the determined difference. For example, when a heating session is initiated the difference between the determined temperature and the first phase target temperature is determined to be 695 ℃, the heating profile on row 4 may be selected as the associated temperature difference ΔT (702 ℃) is most similar to the determined temperature difference. Selecting the heating profile having an associated temperature that is most similar to the determined temperature of the heating arrangement may help to ensure that an appropriate amount of power is provided to the heating arrangement 10, such that the heating arrangement 10 gets as close as possible to the first phase target temperature without significant overshoot, or undershoot.
[0185] In some embodiments, determining, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement 10 comprises determining a difference between the determined temperature and the first phase target temperature, comparing the determined difference to the associated temperature difference ΔT of at least one of the plurality of heating profiles and selecting the heating profile having an associated temperature difference that is larger than and most similar to the determined difference. For example, if the difference between the determined temperature and the first phase target temperature is determined to be 800 ℃, the heating profile on row 6 may be selected as the associated temperature difference ΔT (820 ℃) is larger than and most similar to the determined temperature difference. Selecting the heating profile having an associated temperature that is larger than and most similar to the determined temperature of the heating arrangement may help to ensure that an appropriate amount of power is applied to the heating arrangement, such that the heating arrangement 10 is heated to at least the first phase target temperature. In some embodiments, a heating profile having an associated temperature difference that is smaller than and most similar to the determined temperature difference may be selected. In such embodiments, it will be appreciated that the total power provided to the heating arrangement 10 may be less than a heating profile which is larger than and most similar to the determined temperature difference (as in the embodiment discussed immediately above) . Such embodiments may be utilised where it is particularly important not to overheat the heating arrangement 10 and thus the article 6, for example where there is a specific need to control toxicity levels.
[0186] In some embodiments, determining, based on a determined temperature of the heating arrangement 10, a heating profile to be provided to the heating arrangement comprises determining a difference between the determined temperature and the first phase target temperature, comparing the determined difference to the associated temperature difference of at least one of the plurality of heating profiles and interpolating between the heating values of the two heating profiles having associated temperature differences that are most similar to the determined difference. This will be discussed in more detail in relation to Figures 7a and 7b.
[0187] In some embodiments, each of the plurality of heating profiles or the interpolated heating profile is configured to provide a different total amount of power to the heating arrangement 10 over a given time period. As discussed above, scaling the power provided to the heating arrangement by the different heating profiles may help to ensure that an appropriate amount of power is provided to the heating arrangement 10, such that the heating arrangement 10 gets as close as possible to the first phase target temperature without significant overshoot, or undershoot.
[0188] In some embodiments, the given time period is the first predetermined period of time. In the examples of Figures 7a and 7b, each of the plurality of heating profiles and each of the interpolated heating profiles provides a different amount of power to the heating arrangement over the 12 second period for which the heating profiles are defined.
[0189] In some embodiments, as is the case for the heating profiles shown in Figure 6a, the total power provided to the heating arrangement by each of the plurality of heating profiles is proportional to the total power provided by other heating profiles according to their respective associated temperature differences ΔT. For example, the heating powers of the heating profile on row 3 are each scaled by a factor of 0.9 compared to the heating profiles of row 6. Therefore, the total power applied by the heating profile on row 6 is 10%lower than the total power applied by the heating profile on row 6. This is because the heating profile on row 3 would be applied to a heating arrangement having a smaller temperature difference than the heating profile on row 6 (according to their associated temperature differences ΔT) . The power required to bring a heating arrangement to a desired temperature (e.g. a first phase target temperature) is lower when the heating arrangement has a smaller initial temperature difference (i.e. the temperature of the heating arrangement is closer to the first phase target temperature before any power is applied) . Therefore, scaling the power provided to the heating arrangement according to the associated temperature differences ΔT may help to ensure that an appropriate amount of power is provided to the heating arrangement 10, such that the heating arrangement 10 gets as close as possible to the first phase target temperature without significant overshoot, or undershoot.
[0190] As mentioned above, in some embodiments, an interpolation between two heating profiles may be performed. This may ensure that a most suitable heating profile is applied to the heating arrangement 10, thereby helping to ensure that the heating arrangement 10 gets as close as possible to the first phase target temperature without significant overshoot, or undershoot. . Figures 7a and 7b are tables showing heating profiles. The tables of Figures 7a and 7b show the same heating profiles as Figure 6a apart from the shaded rows (row 4 of Figure 7a and row 5 of Figure 7b) . The shaded rows of Figures 7a and 7b are examples of interpolated heater profiles.
[0191] In some embodiments, an interpolated heating profile may be a single heating power. However, in some embodiments, for example as depicted in Figures 7a and 7b, each of the interpolated heating profiles includes a series of heating powers. In particular, the interpolated heating profiles of this example each include 12 heating powers that are to be applied to the heating arrangement 10.
[0192] In some embodiments, as is the case for Figures 7a and 7b, each of the interpolated heating powers has an associated time period over which the associated heating power is to be applied to the heating arrangement 10. In this example, the associated time periods are the same for each heating power (i.e. each of the associated time periods are one second) . However, it will be understood that in some examples, at least some of the associated time periods are different.
[0193] As discussed above, in some embodiments, the control arrangement 16 comprises a plurality of heating profiles stored thereon and wherein determining the heating profile to be provided to the heating arrangement comprises selecting one of the plurality of heating profiles stored therein. However, in some embodiments, determining the heating profile comprises generating an interpolated heating profile based on an interpolation between two of the plurality of heating profiles. This is described in further detail below.
[0194] For example, in the case whereby the temperature of the heating arrangement is determined to be 147 ℃ or the difference between the temperature of the heating arrangement and the first phase target temperature is determined to be 675 ℃, there is no heating profile which directly corresponds to this measurement. In this example, these temperatures fall exactly halfway between the associated temperatures T and the associated temperature differences ΔT of the heating profiles in row 3 and row 5 of Figure 6a. Therefore, the average of the heating powers is taken to generate a new heating profile (in row 4) . This may also be considered a linear interpolation between the heating values in rows 3 and 5. By interpolating between these values, an appropriate heating profile may be generated when there is no associated temperature T or associated temperature difference ΔT that directly corresponds to the determined temperature of the heating arrangement 10. Interpolating to generate the heating profile may help to ensure that the heating arrangement 10 gets as close as possible to the first phase target temperature without significant overshoot, or undershoot.
[0195] Figure 7b shows another example of an interpolated heating profile in row 5. Here it can be seen that the temperature of the heating arrangement is determined to be 75 ℃ or the difference between the temperature of the heating arrangement and the first phase target temperature is determined to be 747 ℃. Although this is similar to the associate temperature T and the associated temperature difference ΔT of the heating profile in row 6, in some examples an interpolated heating profile may still be calculated, such that small adjustments to the heating powers may be made. Even a small adjustment to the heating power may help to ensure that an appropriate amount of power is provided to the heating arrangement 10, such that the heating arrangement 10 gets as close as possible to the first phase target temperature without significant overshoot, or undershoot. In this example, the heating powers of row 5 are generated by a linear interpolation of the heating powers in rows 4 and 6.
[0196] Whilst linear interpolation is described above, it will be appreciated that any suitable form of interpolation may be utilised.
[0197] In the embodiments of Figures 6a, 7a and 7b, each of the plurality of heater profiles or the interpolated heater profile may be configured such that, when power is provided to the heating arrangement 10 in accordance with the selected heating profile or interpolated heating profile, the heating arrangement 10 reaches the first phase target temperature after the same predetermined time period. Ensuring that the heating arrangement reaches the first phase target temperature after the same predetermined time period irrespective of the initial temperature of the heating arrangement and / or the heating profile being applied may help to ensure that performance of the aerosol generating device is consistent. For example, this may help to ensure that aerosol is generating after approximately the same time period after the user has operated a user input element. This may help to improve the user’s experience of the aerosol generating device.
[0198] In the specific embodiment depicted, the heating profiles may be configured such that the heating arrangement reaches the first phase target temperature of 822 ℃when an appropriate heating profile is applied for the 12 seconds associated with each heating profile.
[0199] Figure 8 is a plot showing the temperature over time of the heating arrangement 10. It can be seen that there are a first set of lines A and a second set of lines B. The first set of lines A is the temperature of the heating arrangement 10 determined by a first temperature sensor located in a first position on the aerosol provision device 4 (e.g. the third temperature sensor 20c of Figure 2) and the second set of lines B is the temperature of the heating arrangement 10 determined by a second temperature sensor located in a second position on the aerosol provision device (e.g. the first temperature sensor 20a of Figure 2) . The difference in temperature between the first and second sets of lines A, B may be due to differences in temperature across the heating arrangement. The location of the temperature sensor (s) may be selected according to the requirements of the system.
[0200] Each of the lines of the first and second set of lines A, B correspond to a different initial temperature of the heating arrangement. In accordance with the embodiments described above, the lines shown on Figure 8 each correspond to a different heating profile applied for each line in the first and second set of lines A, B. The heating profile applied may be chosen according to the initial temperature of the heating arrangement 10 (e.g. the determined temperature of the heating arrangement or a determined temperature difference) .
[0201] As discussed above, each of the plurality of heater profiles or the interpolated heater profile may be configured such that, when power is provided to the heating arrangement 10 in accordance with the selected heating profile or interpolated heating profile, the heating arrangement reaches the first phase target temperature (822 ℃) after the same predetermined time period (7.5 seconds) . This is evidenced by line A in Figure 8.
[0202] In some embodiments, the predetermined time period is less than 20 seconds, optionally less than 15 seconds, optionally less than 12 seconds, optionally less than 10 seconds. In this example, the predetermined time period is approximately 7.5 seconds. Therefore, the aerosol provision device may be configured to produce an aerosol from the aerosol generating material after a short period of time has elapsed.
[0203] Whilst an exemplary first phase target temperature of approximately 822 ℃ is provided above, more generally the first phase target temperature is a temperature suitable for generating aerosol from an aerosol generating material. This temperature may depend on the specific form of the device 4 and / or the article 6. In some embodiments, the first phase target temperature is at least 200 ℃, optionally at least 300 ℃, optionally at least 350 ℃, optionally at least 500 ℃, optionally at least 600 ℃, optionally at least 700 ℃, optionally at least 800 ℃, optionally at least 900 ℃, optionally at least 1000 ℃.
[0204] In the embodiment described above, the aerosol provision device 10 is operated in the first heating phase for a first predetermined period of time of 12 seconds. After this time has elapsed, the aerosol provision device 10 is operated in the second heating phase, in which power is provided to the heating arrangement to maintain the heating arrangement at a second phase target temperature. It can be seen that from approximately 30 seconds after the first heating phase is initiated, the temperature of the heating arrangement is maintained at the second phase target temperature.
[0205] In this embodiment, the first phase target temperature and the second phase target temperatures are different. However, more generally the first and second phase target temperatures may each have any suitable and desired value (s) . The first and second phase target temperatures may be selected to help ensure that the aerosol generated from the aerosol generating material has certain desired properties (e.g. a particular taste, a particular aerosol density etc) .
[0206] Figure 9 is a flow chart of a method of operating an aerosol provision device. Reference will be made to the aerosol provision device 4 described above, although it will be appreciated that the method may be applied to any suitable aerosol provision device. In particular, the flow chart shows a method of determining, based on a determined temperature of the heating arrangement 10, a heating profile to be provided to the heating arrangement.
[0207] First, the method includes the step 401 of comparing the determined temperature of the heating arrangement 10 to a first baseline temperature and a second baseline temperature, wherein the first baseline temperature is smaller than the second baseline temperature. In particular, it is determined whether the determined temperature is between the first baseline temperature and the second baseline temperature. In determining whether the determined temperature falls between the first and second baseline temperatures, a determined temperature that is equal to the first or second baseline temperature is considered also to fall between said temperatures.
[0208] In some embodiments, the first baseline temperature is between 18 ℃ and 22 ℃, optionally between 19 ℃ and 21 ℃, optionally approximately 20 ℃.
[0209] In some embodiments, the second baseline temperature is between 24 ℃ and 28 ℃, optionally between 25 ℃ and 27 ℃, optionally approximately 26 ℃.
[0210] The first and second baseline temperatures may be representative of a typical range for ambient room temperatures. For example, the first and second baseline temperatures may be selected based on a range around a standard room temperature of 23 ℃. For example, selecting a standard room temperature of 23 ± 5 ℃ may lead to a value 18 ℃ for the first baseline temperature and 28 ℃ for the second baseline temperature. Similarly, 23 ± 3 ℃ may lead to a value 20 ℃ for the first baseline temperature and 26 ℃ for the second baseline temperature.
[0211] If, at step 401, it is determined that the determined temperature is between the first baseline temperature and the second baseline temperature, the method proceeds to step 402 of selecting a baseline heating profile from the plurality of heating profiles. That is, the temperature is determined to be within the determined typical range of room temperatures. Therefore, it is determined that a baseline (i.e. standard) heating profile may be applied to the heating arrangement 10.
[0212] If, at step 401, it is determined that the determined temperature is not between the first baseline temperature and the second baseline temperature, the method proceeds to step 403. At step 403, it is determined whether the determined temperature is greater than the second baseline temperature.
[0213] If, at step 403, it is determined that the determined temperature is greater than the second baseline temperature, the method proceeds to step 404 of selecting or interpolating a heating profile in which the total power provided to the heating arrangement is decreased compared to the baseline heating profile. As the heating arrangement has an initial temperature that is higher than a typical room temperature, the power required to bring a heating arrangement to a desired temperature (e.g. a first phase target temperature) is lower than that provided by the baseline heating profile.
[0214] If, at step 403, it is determined that the determined temperature is not greater than the second baseline temperature, it can be inferred from this in combination with the determinations of step 401 and 403 that the determined temperature must be smaller than the first baseline temperature. Therefore, the method proceeds selecting or interpolating a heating profile in which the total power provided to the heating arrangement 10 is increased compared to the baseline heating profile (step 405) . Therefore, as the heating arrangement has an initial temperature that is lower than a typical room temperature, the power required to bring a heating arrangement 10 to a desired temperature (e.g. a first phase target temperature) is higher than that provided by the baseline heating profile.
[0215] By selecting or interpolating a heating profile in which the total power provided to the heating arrangement 10 is increased or decreased compared to the baseline heating profile, an appropriate amount of power may be provided to the heating arrangement 10 based on its determined temperature. This may help to ensure that the heating arrangement 10 is heated to a desired temperature (e.g. a first phase target temperature) irrespective of the initial temperature of the heating arrangement 10. This may be beneficial if the aerosol provision device 4 is being used in an environment having an environmental temperature that is higher or lower than standard room temperature. This may also be beneficial if a heating session is initiated shortly after a previous heating session, before the heating arrangement has cooled to room temperature.
[0216] Figure 10 is a flow chart showing a method of operating an aerosol provision device. Reference will be made to the aerosol provision device 4 described above, although it will be appreciated that the method may be applied to any suitable aerosol provision device. In particular, the flow chart shows a method of determining, based on a determined rate of change of temperature of the heating arrangement 10, a heating profile to be provided to the heating arrangement.
[0217] When determining a heating profile to be applied to the heating arrangement based on the determined temperature, this does not necessarily require the determined temperature to be used directly in such determination. It simply requires that the determination is based on, i.e. uses in some way, the determined temperature. This is exemplified in the various embodiments above whereby the temperature difference, which is calculated using the determined temperature, is utilised in the determining of the heating profile. In some embodiments, determining a heating profile to be applied to the heating arrangement 10 based on the determined temperature comprises determining a heating profile based on a rate of change of temperature of the heating arrangement 10. The rate of change of the heating arrangement 10 may be determined based on, i.e. use, the determined temperature. In such embodiments, the control arrangement 16 may comprise heating profiles stored thereon, each heating profile having an associated rate of change. As with the embodiments described above, interpolation may be performed between two rate of changes and their associated heating profiles to generate a most suitable heating profile. In some embodiments, the heating profile may be generated based on the determined rate of change. The rate of change of the temperature of the heating arrangement 10 may be determined when a heating session is initiated (i.e. following the initiation of a heating session) . This is depicted in Figure 10.
[0218] Specifically, at step 501, following initiation of the heating session, a first power may be applied to the heating arrangement 10 for a first period of time. During this first period of time, as illustrated in step 502, the temperature of the heating arrangement 10 may be determined continuously or at predetermined intervals. As depicted in step 503, the rate of change of the temperature of the heating arrangement 10 may be determined based on the temperature measurement obtained in step 503. In step 504, a determination of the heating profile to be provided to the heating arrangement 10 is made based on the determined rate of change performed in step 503. Then, at step 505 power is provided to the heating arrangement 10 in accordance with the determined heating profile.
[0219] The first power may be provided to the heating arrangement for any suitable and desired first period of time. In some embodiments, the first period of time is less than 10 seconds, optionally less than five seconds, optionally less than 3 seconds, optionally less than 1 second.
[0220] In some embodiments, the determined rate of change of the temperature of the heating arrangement 10 may provide an indication of the initial temperature of the heating arrangement 10. For example, a higher rate of change of the temperature of the heating arrangement 10 may provide an indication that the initial temperature of the heating arrangement is low. Therefore, it may be determined that a heating profile having an increased amount of power (e.g. compared to a baseline heating profile) is to be provided to the heating arrangement 10. Using the rate of change of the temperature of the heating arrangement to determine the heating profile to be applied to the heating arrangement 10 may provide a supplementary or an alternative way to select a heating profile.
[0221] The various embodiments described herein are presented only to assist in understanding and teaching the claimed features. These embodiments are provided as a representative sample of embodiments only, and are not exhaustive and / or exclusive. It is to be understood that advantages, embodiments, examples, functions, features, structures, and / or other aspects described herein are not to be considered limitations on the scope of the invention as defined by the claims or limitations on equivalents to the claims, and that other embodiments may be utilised and modifications may be made without departing from the scope of the claimed invention. Various embodiments of the invention may suitably comprise, consist of, or consist essentially of, appropriate combinations of the disclosed elements, components, features, parts, steps, means, etc., other than those specifically described herein. In addition, this disclosure may include other inventions not presently claimed, but which may be claimed in future.
Claims
1.An aerosol provision device, comprising:a heating arrangement; anda control arrangement configured to:determine a temperature of the heating arrangement; andcontrol power provided to the heating arrangement;wherein, when a heating session is initiated, the aerosol provision device is configured to operate in a first heating phase;wherein, in the first heating phase, the control arrangement is configured to:determine, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement; andprovide power to the heating arrangement in accordance with the determined heating profile.2.An aerosol provision device as claimed in any preceding claim, wherein the aerosol provision device is configured to operate in a second heating phase, following the first heating phase, in which the control arrangement is configured to:determine the temperature of the heating arrangement continuously or at predetermined intervals; andprovide power to the heating arrangement to maintain the heating arrangement at a second phase target temperature.3.An aerosol provision device as claimed in any preceding claim, wherein the aerosol provision device is configured to operate in the first heating phase for a first predetermined period of time and wherein the control arrangement is configured to provide power to the heating arrangement in accordance with the determined heating profile for the first predetermined period of time.4.An aerosol provision device as claimed in any preceding claim, wherein the control arrangement comprises a plurality of heating profiles stored thereon and wherein determining the heating profile to be provided to the heating arrangement comprises selecting one of the plurality of heating profiles or generating an interpolated heating profile based on an interpolation between two of the plurality of heating profiles.5.An aerosol provision device as claimed in any preceding claim, wherein each of the plurality of heating profiles, or the interpolated heating profile, comprises a series of heating powers.6.An aerosol provision device as claimed claim 5, wherein each of the heating powers has an associated time period over which the associated heating power is to be applied to the heating arrangement.7.An aerosol provision device as claimed in any of claims 4 to 6, wherein each of the plurality of heating profiles or the interpolated heating profile is configured to provide a different total amount of power to the heating arrangement over a given time period.8.An aerosol provision device as claimed in any of claims 4 to 7, wherein each of the plurality of heating profiles comprises an associated temperature, wherein the associated temperature is representative of a temperature of the heating arrangement; orwherein each of the plurality of heating profiles comprises an associated temperature difference, wherein the associated temperature difference is representative of a difference between the determined temperature of the heating arrangement and a first phase target temperature of the heating arrangement.9.An aerosol provision device as claimed in claim 8, wherein each of the plurality of heating profiles comprises an associated temperature, and wherein the total power provided to the heating arrangement by each of the plurality of heating profiles is inversely proportional to the total power provided by other heating profiles according to their respective associated temperatures; orwherein each of the plurality of heating profiles comprises an associated temperature difference, and wherein the total power provided to the heating arrangement by each of the plurality of heating profiles is proportional to the total power provided by other heating profiles according to their respective associated temperature differences.10.An aerosol provision device as claimed in any preceding claim, wherein the control arrangement is configured to determine the temperature of the heating arrangement when a heating session is initiated.11.An aerosol provision device as claimed in any of claims 4 to 10, wherein each of the plurality of heater profiles or the interpolated heater profile is configured such that, when power is provided to the heating arrangement in accordance with the selected heating profile or interpolated heating profile, the heating arrangement reaches the first phase target temperature after the same predetermined time period.12.An aerosol provision device as claimed in any preceding claim, wherein the heating arrangement comprises an infrared heater element.13.An aerosol provision device as claimed in any preceding claim, wherein the aerosol generating device comprises a temperature sensor; andwherein the control arrangement is configured to determine the temperature of the heating arrangement based on the output of the temperature sensor.14.An aerosol provision system, comprising:an article comprising an aerosol generating material; andan aerosol provision device as claimed in any preceding claim.15.A method of controlling an aerosol provision device, comprising:when a heating session is initiated, operating the aerosol provision device in a first heating phase;wherein the first heating phase comprises:determining, based on a determined temperature of the heating arrangement, a heating profile to be provided to the heating arrangement; andproviding power to the heating arrangement in accordance with the determined heating profile.