# US 11,896,059 B2 · Method of controlling heating in an aerosol-generating system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,896,059 B2 - Document ID: US11896059B2 - Status: Granted - Kind: B2 - Application number: 17/261,209 - Filed: 2019-07-19 - Published: 2021-06-03 - Granted: 2024-02-13 - Earliest claimed: 2018-07-25 - Assignees: Philip Morris Products S.A. - Applicants: Philip Morris Products S.A. - Inventors: Stephane Bilat - Web page: https://patentgrep.com/patent/US11896059B2 ## CPC - A24F 40/57: Temperature control - A61M 11/042: {electrical} - A24F 40/53: Monitoring, e.g. fault detection - A61M 15/06: Inhaling appliances shaped like cigars, cigarettes or pipes - H05B 1/0227: {Applications} - H05B 1/0297: {Heating of fluids for non specified applications} - A24F 40/10: Devices using liquid inhalable precursors - A24F 40/46: Shape or structure of electric heating means - A61M 2205/0211: Ceramics - A61M 2205/3368: Temperature - A61M 2205/8206: battery-operated - A24F: SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES (inhaling appliances for medical purposes, shaped like cigars, cigarettes or pipes A61M15/06) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract A method of controlling heating in an aerosol-generating system including a heater is provided, the method including: a first control step in which a predetermined power is provided to the heater and a resistance of the heater is determined, the determined resistance being indicative of a temperature of the heater; monitoring for a predetermined condition, and upon detection of the predetermined condition, recording a resistance of the heater; determining a target resistance corresponding to a target temperature of the heater based on the recorded resistance; and a second control step in which the predetermined power provided to the heater is controllably adapted to drive the resistance of the heater towards the target resistance such that the heater is driven towards the target temperature corresponding to the target resistance. An aerosol-generating system and a controller for an aerosol-generating system are also provided. ## Claims ### Claim 1 A method of controlling heating in an aerosol-generating system comprising a heater, the method comprising: a first control step in which a predetermined power is provided to the heater and a resistance of the heater is determined, wherein the determined resistance is indicative of a temperature of the heater; monitoring for a predetermined condition, and upon detection of the predetermined condition, recording a resistance of the heater; determining a target resistance corresponding to a target temperature of the heater based on the recorded resistance; and a second control step in which the predetermined power provided to the heater is controllably adapted to drive the resistance of the heater towards the target resistance such that the heater is driven towards the target temperature corresponding to the target resistance. ### Claim 2 (depends on 1) The method according to claim 1, wherein the method switches from the first control step to the second control step upon detection of the predetermined condition. ### Claim 3 (depends on 1) The method according to claim 1, wherein the predetermined condition is selected from one or more of the following: an elapsed time from a start of a user inhalation, a derivative of resistance being less than a predetermined threshold, and a derivative of resistance being equal to zero. ### Claim 4 (depends on 1) The method according to claim 1, wherein the first control step and the second control step are performed during a user inhalation. ### Claim 5 (depends on 1) The method according to claim 1, wherein the first control step and the second control step are performed during a first user inhalation, and wherein a second and subsequent user inhalations use only the second control step. ### Claim 6 (depends on 1) The method according to claim 1, wherein the target resistance is determined following a plurality of initial user inhalations. ### Claim 7 (depends on 1) The method according to claim 1, wherein only the first control step and the step of monitoring for the predetermined condition, and upon the detection of the predetermined condition, recording the resistance of the heater are performed during a plurality of initial user inhalations. ### Claim 8 (depends on 6) The method according to claim 6, wherein the target resistance is determined based on an average of recorded resistances from the plurality of initial user inhalations. ### Claim 9 (depends on 8) The method according to claim 8, wherein user inhalations following the plurality of initial user inhalations use only the second control step, and wherein the target resistance is based on the average of the recorded resistances from the plurality of initial user inhalations. ### Claim 10 (depends on 1) A controller for an aerosol-generating system, the controller being configured to perform the method of claim 1. ### Claim 11 (depends on 1) A nontransitory computer-readable storage medium having a computer program stored thereon that when executed on electric circuitry of a programmable controller, causes the programmable controller to perform the method according to claim 1. ### Claim 12 An aerosol-generating system, comprising: a heater; a power supply; and a controller configured to: provide a predetermined power to the heater and determine a resistance of the heater in a first control mode, wherein the determined resistance is indicative of a temperature of the heater, monitor for a predetermined condition and upon detection of the predetermined condition, record a resistance of the heater, determine a target resistance corresponding to a target temperature of the heater based on the recorded resistance, and controllably adapt the power provided to the heater to drive the resistance of the heater towards the target resistance in a second control mode such that the heater is driven towards the target temperature corresponding to the target resistance. ### Claim 13 (depends on 12) The aerosol-generating system according to claim 12, wherein the controller is further configured to switch from the first control mode to the second control mode upon detection of the predetermined condition. ### Claim 14 (depends on 12) The aerosol-generating system according to claim 12, wherein the predetermined condition is selected from one or more of the following: an elapsed time from a start of a user inhalation, a derivative of resistance being less than a predetermined threshold, and a derivative of resistance being equal to zero. ### Claim 15 (depends on 12) The aerosol-generating system according to claim 12, wherein the first control mode and the second control mode are used during a user inhalation. ### Claim 16 (depends on 12) The aerosol-generating system according to claim 12, wherein the first control mode and the second control mode are used during a first user inhalation, and wherein a second and subsequent user inhalations use only the second control mode. ### Claim 17 (depends on 12) The aerosol-generating system according to claim 12, wherein the target resistance is determined following a plurality of initial user inhalations. ### Claim 18 (depends on 12) The aerosol-generating system according to claim 12, wherein only the first control mode and the monitoring for the predetermined condition and upon detection of the predetermined condition, recording the resistance of the heater are used during a plurality of initial user inhalations. ### Claim 19 (depends on 17) The aerosol-generating system according to claim 17, wherein the target resistance is determined based on an average of the recorded resistances from the plurality of initial user inhalations. ### Claim 20 (depends on 19) The aerosol-generating system according to claim 19, wherein user inhalations following the plurality of initial user inhalations use only the second control mode, and wherein the target resistance is based on the average of the recorded resistances from the plurality of initial user inhalations.