Aerosol generating device and method of controlling the same

1. An aerosol generating device comprising:

a first heater configured to heat a liquid composition accommodated in a liquid storage of a vaporizer;

a puff sensor configured to detect a pressure change in the aerosol generating device; and

a controller configured to:

determine states of a plurality of sections constituting a puff pattern representing a pressure change over time, based on a signal received from the puff sensor, and

control an operation of the first heater, based on the states of the plurality of sections,

wherein the plurality of sections include a first section and a second section following the first section, and the controller is further configured to start the operation of the first heater based on the first section being determined as a pressure maintaining state and the second section being determined as a pressure falling state.

2. The aerosol generating device of claim 1 , wherein

the plurality of sections include a third section following the second section and a fourth section following the third section, and

the controller is further configured to suspend the operation of the first heater based on the third section being determined as the pressure maintaining state and the fourth section being determined as a pressure rising state.

3. The aerosol generating device of claim 1 , wherein

the plurality of sections include a third section following the second section, a fourth section following the third section, and a fifth section following the fourth section, and

the controller is further configured to suspend the operation of the first heater based on the third section being determined as the pressure maintaining state, the fourth section being determined as a pressure rising state, and the fifth section being determined as the pressure maintaining state.

4. The aerosol generating device of claim 3 , wherein

each of the plurality of sections includes at least one pressure sample value, and

the controller is further configured to:

calculate a first difference value of the at least one pressure sample value between the first section and the third section, and a second difference value of the at least one pressure sample value between the third section and the fifth section, and

suspend the operation of the first heater based on the second difference value is greater than a preset percentage of the first difference value.

5. The aerosol generating device of claim 1 , wherein the controller is further configured to:

after the operation of the first heater starts, determine whether the pressure falling state following the second section continues for a preset period of time, and

determine that a puff detection error has occurred and suspend the operation of the first heater, based on the pressure falling state following the second section continuing for the preset period of time or less.

6. The aerosol generating device of claim 5 , wherein

an operation time for the first heater to operate one time is limited to an allowable operation time or less, and

the controller is further configured to, based on determining that the puff detection error has occurred:

measure a time period between the start of the operation of the first heater and the suspension of the operation of the first heater, and

reduce the allowable operation time in proportion to the time period when the first heater operates next time.

7. The aerosol generating device of claim 3 , wherein the controller is further configured to count a number of puffs based on the first section being determined as the pressure maintaining state, the second section being determined as the pressure falling state, the third section being determined as the pressure maintaining state, the fourth section being determined as the pressure rising state, and the fifth section being determined as the pressure maintaining state.

8. The aerosol generating device of claim 1 , further comprising:

a second heater arranged in a case and configured to heat a cigarette inserted in the case;

a mainstream passage providing fluid communication between the case and the vaporizer; and

a puff sensor configured to detect a change in pressure of air passing through the mainstream passage,

wherein the controller is further configured to control an operation of at least one of the first and second heaters, based on the states of the plurality of sections.

9. An aerosol generating device comprising:

a first heater configured to heat a liquid composition accommodated in a liquid storage of a vaporizer;

a puff sensor configured to detect a pressure change in the aerosol generating device; and

a controller configured to:

determine states of a plurality of sections constituting a puff pattern representing a pressure change over time, based on a signal received from the puff sensor, and

control an operation of the first heater, based on the states of the plurality of sections,

wherein the controller is further configured to:

calculate a slope cumulative value for each of the plurality of sections, and

determine the states of the plurality of sections, based on the slope cumulative value of each of the plurality of sections.

10. The aerosol generating device of claim 9 , wherein

a section of which the slope cumulative value is within a preset range is determined as a pressure maintaining state,

a section of which the slope cumulative value is less than or equal to a preset negative value is determined as a pressure falling state, and

a section of which the slope cumulative value is greater than or equal to a preset positive value is determined as a pressure rising state.

11. The aerosol generating device of claim 9 , wherein

a signal received from the puff sensor includes pressure measured values measured at preset intervals of time, and

the controller is further configured to calculate a plurality of pressure sample values by averaging some consecutive values of the pressure measured values, and calculate the slope cumulative value based on the plurality of pressure sample values.

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

determining states of a plurality of sections constituting a puff pattern representing a pressure change over time, based on a signal received from a puff sensor; and

controlling an operation of a first heater based on the states of the plurality of sections,

wherein the plurality of sections include a first section and a second section following the first section, and the controlling of the operation of the first heater includes starting the operation of the first heater based on the first section being determined as a pressure maintaining state and the second section being determined as a pressure falling state.

13. The method of claim 12 , wherein

the plurality of sections include a third section following the second section and a fourth section following the third section, and

the controlling of the operation of the first heater further includes suspending the operation of the first heater based on the third section being determined as the pressure maintaining state and the fourth section being determined as a pressure rising state.

14. The method of claim 12 , wherein

the plurality of sections include a third section following the second section, a fourth section following the third section, and a fifth section following the fourth section, and

the controlling of the operation of the first heater further includes suspending the operation of the first heater based on the third section being determined as the pressure maintaining state, the fourth section being determined as a pressure rising state, and the fifth section being determined as the pressure maintaining state.

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

determining states of a plurality of sections constituting a puff pattern representing a pressure change over time, based on a signal received from a puff sensor; and

controlling an operation of a first heater based on the states of the plurality of sections,

wherein the determining of the states of the plurality of sections includes:

calculating a slope cumulative value for each of the plurality of sections, and

determining the states of the plurality of sections based on the slope cumulative value of each of the plurality of sections.

16. The method of claim 15 , wherein determining of the states of the plurality of sections, based on the slope cumulative value of each of the plurality of sections comprises:

determining a section of which the slope cumulative value is within a preset range as a pressure maintaining state;

determining a section of which the slope cumulative value is less than or equal to a preset negative value as a pressure falling state; and

determining a section of which the slope cumulative value is greater than or equal to a preset positive value as a pressure rising state.

17. The method of claim 15 , wherein

the signal received from the puff sensor includes pressure measured values measured at certain intervals of time, and

the calculating of the slope cumulative value includes calculating a plurality of pressure sample values by averaging some consecutive values of the pressure measured values, and calculating the slope cumulative value for each of the plurality of sections based on the plurality of pressure sample values.

18. A computer readable recording medium having recorded thereon a computer program for executing the method of claim 12 .