Abstract: An electrically operated aerosol-generating system is provided, including a heating element to heat an aerosol-forming substrate; a power supply to supply power to the heating element; a temperature sensor to sense a temperature at the heating element; electric circuitry in communication with the heating element, the temperature sensor, and the power supply, the circuitry to regulate the supply of power based on a measured temperature, determine an adverse condition when a rate of change of power supplied required to reach or maintain a predetermined temperature falls outside a predefined range stored in the memory, and control power supplied based on whether there is an adverse condition or provide an indication when there is an adverse condition; a device and a removable cartridge, the power supply and the circuitry being in the device and the heating element being in the removable cartridge, and the cartridge including a liquid aerosol-forming substrate.

Abstract: An electrically operated aerosol-generating system is provided, including: a heating element to heat an aerosol-forming substrate proximate to the heating element; a power supply to supply power to the heating element; and electric circuitry in communication with the heating element and the power supply, the electric circuitry including a memory and being configured to: regulate a supply of power to the heating element for a heating cycle period in response to a user input, determine a first derivative of an electrical resistance of the heating element with respect to time, determine that there is an adverse condition if the first derivative exceeds a threshold value stored in the memory during a heating cycle period at or subsequent to a predetermined time in the period, and control power supplied to the heating element or provide an indication based on whether there is an adverse condition at the heating element.

Abstract: An electrically operated aerosol-generating system is provided, including: a heating element to heat an aerosol-forming substrate; a power supply; a temperature sensor; electric circuitry in communication with the element, the sensor, and the power supply, and configured to regulate a supply of power based on a measured temperature, determine an adverse condition when a reduction in power required to reach or to maintain a predetermined temperature over successive heating cycles falls outside a predefined range, by comparing the power supplied in a given heating cycle with that of preceding heating cycles, the predefined range stored in the memory, and control the power supplied based on whether there is the adverse condition or provide an indication when there is the adverse condition; and a device and a removable cartridge including a liquid aerosol-forming substrate, the power supply and the circuitry being in the device and the element being in the cartridge.

Abstract: An electrically operated aerosol-generating system is provided, including: a heating element; a power supply; a temperature sensor; electric circuitry in communication with the heating element, temperature sensor, and the power supply, the circuitry including a memory to regulate a supply of power based on the measured temperature, determine an adverse condition when a rate of change of power supplied to reach or maintain a predetermined temperature falls outside a predefined range stored in the memory, and control power supplied based on whether there is an adverse condition or provide an indication when there is an adverse condition; and a device and a removable cartridge, the power supply and the circuitry being in the device and the heating element being in the cartridge, the cartridge including a liquid aerosol-forming substrate, and the circuitry is further to determine an adverse condition only after the temperature is at a target temperature.

Abstract: A method of controlling aerosol production in an aerosol-generating system is provided, the system including: data storage, an aerosol-generating element, a flow channel configured to provide an air flow past the element when a user puffs on the system, and a flow sensor configured to detect the air flow; and the method including: increasing a power supplied to the element from a first power to at least a second power when the flow sensor detects that a flow rate of the air flow is greater than a first threshold, storing measurements taken by the flow sensor in the data storage, using measurements stored in the data storage to intermittently calculate an estimate of a remaining volume of the puff, and decreasing the power supplied to a third power when the estimate of the remaining volume is less than a second threshold being or indicative of a measure of volume.

Abstract: A method of controlling aerosol production in an aerosol-generating system is provided, the system including an aerosol-generating element and a housing having an air inlet and an air outlet, a flow channel defined from the air inlet to the air outlet configured to provide a flow of air past the aerosol-generating element, and a flow sensor configured to detect an air flow in the flow channel; and the method including increasing a power supplied to the aerosol-generating element for at least a second time if the flow sensor detects that the flow rate of the air flow increases past a threshold. There is also provided an aerosol-generating system comprising circuitry configured to perform the method.

Abstract: An electrically operated aerosol-generating system is provided, including: a heating element to heat an aerosol-forming substrate proximate to the heating element; a power supply to supply power to the heating element; and electric circuitry in communication with the heating element and the power supply, the electric circuitry including a memory and being configured to: regulate a supply of power to the heating element for a heating cycle period in response to a user input, determine a first derivative of an electrical resistance of the heating element with respect to time, determine that there is an adverse condition if the first derivative exceeds a threshold value stored in the memory during a heating cycle period at or subsequent to a predetermined time in the period, and control power supplied to the heating element or provide an indication based on whether there is an adverse condition at the heating element.

Abstract: An electrically operated aerosol-generating system is provided, including: a heating element configured to heat an aerosol-forming substrate proximate to the heating element; a power supply; and electric circuitry in communication with the element and the power supply, and configured to regulate the supply of power during a plurality of discrete heating cycles in response to user inputs, determine a maximum electrical resistance of the heating element during each heating cycle, calculate a rolling average value of the resistance for n preceding heating cycles, n being an integer greater than 1, compare the resistance with the calculated value, determine an adverse condition when the resistance is greater than the calculated value by more than a threshold value, the threshold value being stored in the memory, and control the power supplied based on whether there is the adverse condition or to provide an indication based on whether there is the adverse condition.

Abstract: An electrically operated aerosol-generating system is provided, including: a heating element to heat an aerosol-forming substrate; a power supply; a temperature sensor; electric circuitry in communication with the element, the sensor, and the power supply, and configured to regulate a supply of power based on a measured temperature, determine an adverse condition when a reduction in power required to reach or to maintain a predetermined temperature over successive heating cycles falls outside a predefined range, by comparing the power supplied in a given heating cycle with that of preceding heating cycles, the predefined range stored in the memory, and control the power supplied based on whether there is the adverse condition or provide an indication when there is the adverse condition; and a device and a removable cartridge including a liquid aerosol-forming substrate, the power supply and the circuitry being in the device and the element being in the cartridge.

Abstract: An electrically operated aerosol-generating system is provided, including: a heating element configured to heat an aerosol-forming substrate proximate to the heating element; a power supply; and electric circuitry in communication with the element and the power supply, and configured to regulate the supply of power during a plurality of discrete heating cycles in response to user inputs, determine a maximum electrical resistance of the heating element during each heating cycle, calculate a rolling average value of the resistance for n preceding heating cycles, n being an integer greater than 1, compare the resistance with the calculated value, determine an adverse condition when the resistance is greater than the calculated value by more than a threshold value, the threshold value being stored in the memory, and control the power supplied based on whether there is the adverse condition or to provide an indication based on whether there is the adverse condition.

Abstract: A method of controlling aerosol production in an aerosol-generating system is provided, the system including an aerosol-generating element and a housing having an air inlet and an air outlet, a flow channel defined from the air inlet to the air outlet configured to provide a flow of air past the aerosol-generating element, and a flow sensor configured to detect an air flow in the flow channel; and the method including increasing a power supplied to the aerosol-generating element for at least a second time if the flow sensor detects that the flow rate of the air flow increases past a threshold. There is also provided an aerosol-generating system comprising circuitry configured to perform the method.