Inhalation device, control method, and non-transitory computer readable medium
An inhalation device includes a heating part for heating a base material to generate aerosol and a control part for controlling operation of the heating part on the basis of a heating profile in which a target temperature is specified, the target temperature being a target value for the temperature of the heating part, wherein: the heating profile includes time sections continuous along a time axis; in each of the plurality of time sections, the target temperature at the end of each time section is set; the heating profile includes a midway temperature drop section on the way; the target temperature set in the midway temperature drop section is lower than the target temperature set in the time section immediately preceding the midway temperature drop section; and the control part performs control such that the heating part is not supplied with power in the midway temperature drop section.
1 . An inhaler device comprising:
a heater configured to heat a substrate to generate an aerosol and measure temperature of the heater based on an electric resistance value of a heating resistor of the heater;
a controller configured to control an operation of the heater in accordance with a heating profile that defines a time-series progression of a target temperature, the target temperature being a target value of a temperature of the heater; and
a temperature sensor configured to measure temperature of the heater, wherein
the heating profile includes a plurality of time sections that are continuous along a time axis,
each of the plurality of time sections is assigned the target temperature for an end of each time section,
the heating profile includes an initial temperature rise section, an intermediate temperature drop section, and a temperature re-rise section in sequence,
the target temperature set for the intermediate temperature drop section is lower than the target temperature set for the initial temperature rise section being a time section immediately before the intermediate temperature drop section, and
the controller is configured to determine an end of the initial temperature rise section and the temperature re-rise section in accordance with temperature of the heater measured based on the electric resistance value, perform control such that no electric power is supplied to the heater in the intermediate temperature drop section, and determine an end of the intermediate temperature drop section in accordance with temperature of the heater measured by the temperature sensor.
2 . The inhaler device according to claim 1 , wherein
the controller is configured to control the operation of the heater in accordance with an actual temperature of the heater and the target temperature set for the intermediate temperature drop section at a beginning of a time section subsequent to the intermediate temperature drop section.
3 . The inhaler device according to claim 2 , wherein
the controller is configured to supply electric power to the heater at a first duty ratio at the beginning of the time section subsequent to the intermediate temperature drop section in a case where the actual temperature of the heater is less than the target temperature set for the intermediate temperature drop section, and supply electric power to the heater at a second duty ratio at the beginning of the time section subsequent to the intermediate temperature drop section in a case where the actual temperature of the heater is equal to or higher than the target temperature set for the intermediate temperature drop section, and
the first duty ratio is larger than the second duty ratio.
4 . The inhaler device according to claim 1 , wherein
the target temperature set for the initial temperature rise section is higher than an initial value.
5 . The inhaler device according to claim 4 , wherein
the initial temperature rise section includes a first temperature rise section and a second temperature rise section subsequent to the first temperature rise section,
the first temperature rise section and the second temperature rise section have different temperature rise widths per unit time,
the temperature rise width per unit time in the first temperature rise section has a value obtained by dividing a difference between the target temperature set for the first temperature rise section and the initial value by a time length of the first temperature rise section, and
the temperature rise width per unit time in the second temperature rise section has a value obtained by dividing a difference between the target temperature set for the second temperature rise section and the target temperature set for the first temperature rise section by a time length of the second temperature rise section.
6 . The inhaler device according to claim 5 , wherein
the temperature rise width per unit time in the second temperature rise section is smaller than the temperature rise width per unit time in the first temperature rise section.
7 . The inhaler device according to claim 4 , wherein
the initial temperature rise section includes a temperature maintenance section at an end thereof, and
the target temperature set for the temperature maintenance section is the same as the target temperature set for a time section immediately before the temperature maintenance section.
8 . The inhaler device according to claim 1 , wherein
the target temperature set for the temperature re-rise section is higher than the target temperature set for a time section immediately before the temperature re-rise section.
9 . The inhaler device according to claim 8 , wherein
the temperature re-rise section alternately includes a temperature maintenance section and a temperature rise section,
the target temperature set for the temperature maintenance section is the same as the target temperature set for a time section immediately before the temperature maintenance section, and
the target temperature set for the temperature rise section is higher than the target temperature set for a time section immediately before the temperature rise section.
10 . The inhaler device according to claim 1 , wherein
the heating profile further includes a temperature maintenance section, and
the target temperature set for the temperature maintenance section is the same as the target temperature set for a time section immediately before the temperature maintenance section.
11 . The inhaler device according to claim 1 , wherein
when compared among the initial temperature rise section, the intermediate temperature drop section, and the temperature re-rise section, an absolute value of an amount of change in the target temperature per unit time is smallest in the temperature re-rise section, second smallest in the intermediate temperature drop section, and largest in the initial temperature rise section,
the absolute value of the amount of change in the target temperature per unit time in the initial temperature rise section is a value obtained by dividing an absolute value of a difference between the target temperature set for the initial temperature rise section and the initial value by a time length of the initial temperature rise section,
the absolute value of the amount of change in the target temperature per unit time in the intermediate temperature drop section is a value obtained by dividing an absolute value of a difference between the target temperature set for the intermediate temperature drop section and the target temperature set for the time section immediately before the intermediate temperature drop section by a time length of the intermediate temperature drop section, and
the absolute value of the amount of change in the target temperature per unit time in the temperature re-rise section is a value obtained by dividing an absolute value of a difference between the target temperature set for the temperature re-rise section and the target temperature set for the time section immediately before the temperature re-rise section by a time length of the temperature re-rise section.
12 . The inhaler device according to claim 1 , wherein
when a time length of the initial temperature rise section, a time length of the intermediate temperature drop section, and a time length of the temperature re-rise section are compared, the time length of the intermediate temperature drop section is shortest, the time length of the initial temperature rise section is second shortest, and the time length of the temperature re-rise section is longest.
13 . The inhaler device according to claim 1 , further comprising a chamber configured to receive the substrate, wherein
the chamber includes an opening into which the substrate is to be inserted, and a holder configured to hold the substrate, and
the holder includes a pressing portion configured to press a portion of the substrate, and a non-pressing portion, and
the heater is disposed on an outer surface of the pressing portion.
14 . The inhaler device according to claim 1 , wherein
the temperature re-rise section includes a plurality of slots, the plurality of slots being time sections that are continuous along a time axis, and assigned the target temperature for an end of each of the plurality of slots,
the target temperature set for a slot is equal to or higher than the target temperature set for another slot that is before the slot and that is continuous with the slot,
each of the plurality of slots is assigned a plurality of switching conditions, and
the controller is configured to switch a slot for which any one of the plurality of switching conditions is satisfied among the plurality of slots to another slot among the plurality of slots and control the operation of the heater in accordance with the another slot.
15 . The inhaler device according to claim 1 , wherein
the controller is configured to control the operation of the heater in accordance with a deviation of an actual temperature of the heater from the target temperature corresponding to an elapsed time from a start of control of the operation of the heater based on the heating profile.
16 . A control method for controlling an inhaler device including a heater configured to heat a substrate to generate an aerosol, the control method comprising:
measuring temperature of the heater based on an electric resistance value of a heating resistor of the heater;
controlling an operation of the heater in accordance with a heating profile that defines a time-series progression of a target temperature, the target temperature being a target value of a temperature of the heater; and
measuring temperature of the heater using a temperature sensor, wherein
the heating profile includes a plurality of time sections that are continuous along a time axis,
each of the plurality of time sections is assigned the target temperature for an end of each time section,
the heating profile includes an initial temperature rise section, an intermediate temperature drop section, and a temperature re-rise section in sequence,
the target temperature set for the intermediate temperature drop section is lower than the target temperature set for the initial temperature rise section being a time section immediately before the intermediate temperature drop section, and
the controlling of an operation of the heater includes determining an end of the initial temperature rise section and the temperature re-rise section in accordance with temperature of the heater measured based on the electric resistance value, performing control such that no electric power is supplied to the heater in the intermediate temperature drop section, and determining an end of the intermediate temperature drop section in accordance with temperature of the heater measured by the temperature sensor.
17 . A non-transitory computer readable medium having a program stored therein, the program for causing a computer for controlling an inhaler device including a heater configured to heat a substrate to generate an aerosol, to execute:
measuring temperature of the heater based on an electric resistance value of a heating resistor of the heater;
controlling an operation of the heater in accordance with a heating profile that defines a time-series progression of a target temperature, the target temperature being a target value of a temperature of the heater; and
measuring temperature of the heater using a temperature sensor, wherein
the heating profile includes a plurality of time sections that are continuous along a time axis,
each of the plurality of time sections is assigned the target temperature for an end of each time section,
the heating profile includes an initial temperature rise section, an intermediate temperature drop section, and a temperature re-rise section in sequence,
the target temperature set for the intermediate temperature drop section is lower than the target temperature set for the initial temperature rise section being a time section immediately before the intermediate temperature drop section, and
the controlling of an operation of the heater includes determining an end of the initial temperature rise section and the temperature re-rise section in accordance with temperature of the heater measured based on the electric resistance value, performing control such that no electric power is supplied to the heater in the intermediate temperature drop section, and determining an end of the intermediate temperature drop section in accordance with temperature of the heater measured by the temperature sensor.