WO2022230320A1 - Dispositif de génération d'aérosol, procédé de commande et programme informatique - Google Patents

Dispositif de génération d'aérosol, procédé de commande et programme informatique Download PDF

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Publication number
WO2022230320A1
WO2022230320A1 PCT/JP2022/006893 JP2022006893W WO2022230320A1 WO 2022230320 A1 WO2022230320 A1 WO 2022230320A1 JP 2022006893 W JP2022006893 W JP 2022006893W WO 2022230320 A1 WO2022230320 A1 WO 2022230320A1
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Prior art keywords
temperature
control
section
heating unit
value
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PCT/JP2022/006893
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English (en)
Japanese (ja)
Inventor
健太郎 山田
達也 青山
拓嗣 川中子
徹 長浜
貴司 藤木
亮 吉田
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日本たばこ産業株式会社
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Publication of WO2022230320A1 publication Critical patent/WO2022230320A1/fr

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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/50—Control or monitoring
    • A24F40/57—Temperature control

Definitions

  • the present disclosure relates to an aerosol generator, control method, and computer program.
  • An electrically heated aerosol generator that generates an aerosol by heating an aerosol source and delivers the generated aerosol to a user.
  • electronic cigarettes are one type of such aerosol-generating devices that add flavoring components to the generated aerosol for inhalation by the user.
  • the amount of aerosol generated from the aerosol source per unit time varies depending on the properties and shape of the substrate containing the aerosol source as well as the temperature at which the substrate is heated.
  • the aerosol generating device controls the heating temperature such that the desired amount of aerosol is delivered to the user.
  • a representation of temperature change over time is called a temperature profile
  • a temperature profile defined in chronological order for realizing a desired temperature profile is called a heating profile.
  • U.S. Pat. No. 5,900,000 raises the temperature of the heating element to a high value in a first step, lowers the temperature of the heating element to a lower value in a second step, and lowers the temperature of the heating element in a third step. It discloses a temperature profile with a gradual increase. This temperature profile flattens the amount of aerosol generation to some extent over time. In order to realize this temperature profile, Patent Document 1 also discloses that the temperature of the heating element is led to the target temperature by PID control, which is typical feedback control. Patent Literature 2 discloses a method of temporarily stopping power supply to a heating element when the temperature of the heating element, which has been raised once, is lowered.
  • JP 2020-74797 A Japanese Patent Publication No. 2019-531049
  • the technology according to the present disclosure aims to provide a mechanism that can flexibly change the contents of temperature control.
  • a temperature index related to the temperature of the heating unit according to a control sequence consisting of a heating unit that heats an aerosol source to generate an aerosol, a power source that supplies power to the heating unit, and a plurality of sections. and a control unit that controls the supply of power from the power source to the heating unit using
  • the plurality of control methods are described by structured data including one information element, and the plurality of control methods include a first method that performs feedback control using the temperature index, and power supply from the power supply to the heating unit.
  • An aerosol generating device is provided that includes a second mode of deactivation.
  • the structured data may include a second information element specifying the target value of the temperature control for each interval.
  • the structured data may include a third information element specifying a gain value of the feedback control for each section to which the first method should be applied.
  • the third information element may specify one of a plurality of candidate values of the feedback control gain commonly defined over the plurality of intervals for each interval to which the first method is to be applied. good.
  • the third information element specifies a first value of proportional gain for a first interval for increasing the temperature of the heating unit, and specifies a first value for proportional gain for a second interval for maintaining the temperature of the heating unit.
  • a second value may be specified, said first value being greater than said second value.
  • the control unit may reset the cumulative deviation of the integral term of the feedback control when a gain value different from the gain value specified in the preceding interval is specified by the third information element in a certain interval. good.
  • the controller controls that the number of times the temperature index reaches the target value specified by the second information element in a first interval for increasing the temperature of the heating unit is equal to a first threshold greater than one. When it becomes, the temperature control of the first section may be terminated.
  • the temperature index When the temperature index exceeds a second threshold equal to the product of the target value specified by the second information element and a coefficient representing an allowable deviation in the first interval, the temperature index may be considered to have reached the target value.
  • the structured data specifies whether the feedback control should be performed while maintaining the target value of the temperature control constant or whether the feedback control should be performed while changing the target value of the temperature control step by step.
  • a fourth information element may be further included, and the fourth information element may be the same as or different from the first information element.
  • control section controls the power supply from the power source to the heating section at a settable maximum duty ratio regardless of the gain value specified by the third information element. Power may be supplied.
  • the structured data may further include a fifth information element specifying a condition for terminating temperature control in each section, among a plurality of termination conditions.
  • the structured data further includes a sixth information element specifying a length of time for each interval, and the plurality of end conditions are elapse of the length of time specified by the sixth information element, the temperature At least two of the conditions of reaching the target value of the index and reaching the target value of the temperature index, whichever is earlier, of elapse of the length of time specified by the sixth information element and reaching the target value of the temperature index. It's okay.
  • the aerosol generating device further includes a storage unit that stores the structured data in a predetermined storage area, and the control unit reads the structured data from the predetermined storage area of the storage unit.
  • a control method for controlling the generation of aerosol in an aerosol generator.
  • the control method may include processing steps corresponding to any combination of the above-described features of the aerosol generating device.
  • a computer program for controlling aerosol generation in an aerosol generation device.
  • the computer program may include arrangements corresponding to any combination of the above-described features of the aerosol generating device.
  • FIG. 2 is an explanatory diagram for explaining insertion of a tobacco stick into the aerosol generating device of FIG. 1;
  • FIG. 2 is a block diagram showing an example of a schematic circuit configuration of the aerosol generator of FIG. 1;
  • FIG. 2 is a block diagram showing an example configuration of a measurement circuit used to measure the temperature of the heating section;
  • FIG. 4 is an explanatory diagram for explaining a measurement period and a PWM control period during a heating period;
  • FIG. 4 is an explanatory diagram for explaining an example of the positional relationship between the heating unit and the thermistor; Explanatory drawing for demonstrating the temperature profile and heating profile which concern on one Embodiment.
  • FIG. 2 is an explanatory diagram for explaining insertion of a tobacco stick into the aerosol generating device of FIG. 1;
  • FIG. 2 is a block diagram showing an example of a schematic circuit configuration of the aerosol generator of FIG. 1;
  • FIG. 2 is a block diagram showing an example configuration of a measurement circuit used to measure
  • FIG. 10 is an explanatory diagram showing an example of a temperature profile when a remaining time is added to the time length of the subsequent section because the temperature drop section ends earlier than the predetermined time;
  • FIG. 5 is an explanatory diagram for explaining the relationship between the first temperature index and the second temperature index;
  • FIG. 4 is an explanatory diagram showing two examples of temperature profiles when the target temperature of the subsequent interval is reset to the temperature at the end of the temperature drop interval.
  • FIG. 11 is an explanatory diagram showing an example of a temperature profile in a case where the subsequent section is shortened because the temperature drop section ends later than the predetermined time in the first modification;
  • FIG. 11 is an explanatory diagram showing an example of a temperature profile in a case where the subsequent section is shortened because the temperature drop section ends later than the predetermined time in the second modification;
  • FIG. 11 is an explanatory diagram showing an example of a temperature profile in a case where the end of the temperature drop section is significantly delayed from the predetermined time, so that the subsequent section is skipped and the further subsequent section is shortened in the first modified example;
  • FIG. 11 is an explanatory diagram showing an example of a temperature profile in a case where the subsequent section is shortened because the temperature drop section ends later than the predetermined time in the second modification
  • FIG. 11 is an explanatory diagram showing an example of a temperature profile in a case where the end of the temperature drop section is significantly delayed from the predetermined time, so that the subsequent section is skipped and the further subsequent section is shortened in the second modification; Explanatory drawing which shows an example of the temperature profile in the case of resetting the target temperature of the temperature maintenance area before completion
  • FIG. 11 is an explanatory diagram showing an example of a temperature profile including a recovery section according to a third modified example;
  • FIG. 4 is an explanatory diagram showing a first example of the configuration of profile data describing a heating profile;
  • FIG. 5 is an explanatory diagram showing a second example of the configuration of profile data describing a heating profile; 4 is a flowchart showing an example of the overall flow of aerosol generation processing according to one embodiment;
  • FIG. 19 is a flow chart showing an example of a temperature control process flow for the PID control section of FIG. 18;
  • FIG. 19 is a flowchart showing a first example of the flow of temperature control processing for the off period of FIG. 18;
  • FIG. FIG. 19 is a flowchart showing a second example of the flow of temperature control processing for the off period of FIG. 18;
  • FIG. FIG. 19 is a flowchart showing a third example of the flow of temperature control processing for the off period of FIG. 18;
  • 4 is a flow chart showing an example of the flow of a process for judging the end of a preheating period.
  • 4 is a flowchart showing an example of the flow of a process for determining the end of a temperature drop section;
  • 4 is a flowchart showing an example of the flow of control parameter selection processing after the end of the temperature drop section;
  • FIG. 1 is a perspective view showing the appearance of an aerosol generator 10 according to one embodiment.
  • FIG. 2 is an explanatory diagram for explaining insertion of a tobacco stick into the aerosol generating device 10 shown in FIG.
  • the aerosol generating device 10 comprises a main body 101, a front panel 102, a viewing window 103 and a slider 104.
  • the main body 101 is a housing that supports one or more circuit boards of the aerosol generating device 10 inside.
  • the main body 101 has a substantially rounded rectangular parallelepiped shape that is long in the vertical direction in the figure.
  • the size of the main body 101 may be, for example, a size that allows the user to hold it with one hand.
  • the front panel 102 is a flexible panel member that covers the front surface of the main body 101 . Front panel 102 may be removable from body 101 .
  • the front panel 102 also functions as an input unit for accepting user input. For example, when the user presses the center of the front panel 102, a button (not shown) disposed between the main body 101 and the front panel 102 is pressed, and user input can be detected.
  • the display window 103 is a strip-shaped window extending in the longitudinal direction at substantially the center of the front panel 102 .
  • the display window 103 transmits light emitted by one or more LEDs (Light-Emitting Diodes) arranged between the main body 101 and the front panel 102 to the outside.
  • LEDs Light-Emitting Diodes
  • the slider 104 is a cover member slidably disposed on the upper surface of the main body 101 along the direction 104a. As shown in FIG. 2, when the slider 104 is slid forward in the drawing (that is, the slider 104 is opened), the opening 106 on the upper surface of the main body 101 is exposed. When inhaling aerosol using the aerosol generator 10, the user inserts the tobacco stick 15 from the opening 106 exposed by opening the slider 104 into the tubular insertion hole 107 along the direction 106a.
  • the cross-section perpendicular to the axial direction of the insertion hole 107 may be circular, elliptical, or polygonal, for example, and the cross-sectional area gradually decreases toward the bottom surface.
  • the outer surface of the tobacco stick 15 inserted into the insertion hole 107 is pressed from the inner surface of the insertion hole 107, preventing the tobacco stick 15 from falling off due to the frictional force, and preventing the tobacco stick 15 from falling off from the heating unit 130, which will be described later.
  • the transfer efficiency of heat transfer to is enhanced.
  • a tobacco stick 15 is a tobacco article that holds a filler inside a tubular wrapping paper.
  • the filling of tobacco sticks 15 may be, for example, a mixture of an aerosol-generating substrate and tobacco cuts.
  • aerosol-generating substrates substrates containing any type of aerosol source may be used, such as glycerin, propylene glycol, triacetin, 1,3-butanediol, or mixtures thereof.
  • Tobacco shreds are so-called flavor sources. Tobacco shredded material may be, for example, laminae or backbones.
  • a non-tobacco-derived flavor source may be used instead of tobacco shreds.
  • FIG. 3 is a block diagram showing an example of a schematic circuit configuration of the aerosol generator 10.
  • the aerosol generating device 10 includes a control unit 120, a storage unit 121, an input detection unit 122, a state detection unit 123, an suction detection unit 124, a light emission unit 125, a vibration unit 126, and a communication interface (I/F). 127 , connection I/F 128 , heating unit 130 , first switch 131 , second switch 132 , battery 140 , booster circuit 141 , fuel gauge 142 , measuring circuit 150 , and thermistor 155 .
  • I/F communication interface
  • the control unit 120 may be a processor such as a CPU (Central Processing Unit) or a microcontroller.
  • the control unit 120 controls all functions of the aerosol generation device 10 by executing computer programs (also referred to as software or firmware) stored in the storage unit 121 .
  • the storage unit 121 may be, for example, a semiconductor memory.
  • the storage unit 121 stores one or more computer programs and various data (for example, profile data 51 describing the heating profile 50) used for heating control, which will be described later.
  • the input detection unit 122 is a detection circuit for detecting user input.
  • the input detection unit 122 detects, for example, pressing of the front panel 102 by the user (that is, pressing of a button), and outputs an input signal indicating the detected state to the control unit 120 .
  • the aerosol generating device 10 may comprise any kind of input device, such as buttons, switches or touch-sensitive surfaces.
  • the state detection unit 123 is a detection circuit for detecting the open/closed state of the slider 104 . State detection unit 123 outputs a state detection signal indicating whether slider 104 is open or closed to control unit 120 .
  • the suction detection unit 124 is a detection circuit for detecting suction (puffing) of the tobacco stick 15 by the user.
  • suction detection unit 124 may include a thermistor (not shown) disposed near opening 106 . In this case, the suction detection unit 124 can detect suction based on a change in the resistance value of the thermistor caused by a temperature change caused by the user's suction.
  • the suction detection unit 124 may include a pressure sensor (not shown) arranged at the bottom of the insertion hole 107 . In this case, the suction detection unit 124 can detect suction based on a decrease in air pressure caused by airflow caused by suction.
  • the suction detection unit 124 outputs, for example, a suction detection signal indicating whether or not suction is being performed to the control unit 120 .
  • the light emitting unit 125 includes one or more LEDs and a driver for driving the LEDs.
  • Light emitting unit 125 causes each of the LEDs to emit light according to an instruction signal input from control unit 120 .
  • Vibrating section 126 includes a vibrator (eg, an eccentric motor) and a driver for driving the vibrator. Vibrating section 126 vibrates the vibrator according to an instruction signal input from control section 120 .
  • the control unit 120 may use one or both of the light emitting unit 125 and the vibrating unit 126 in any pattern, for example, to notify the user of some status of the aerosol generating device 10 (eg progress of a session). .
  • the light emission pattern of the light emitting unit 125 can be distinguished by factors such as the light emission state of each LED (constant light emission/blinking/non-light emission), blinking period, and emission color.
  • the vibration pattern of the vibrating section 126 can be distinguished by factors such as the vibration state (vibration/stop) of the vibrator and the strength of the vibration.
  • the wireless I/F 127 is a communication interface for the aerosol generating device 10 to wirelessly communicate with other devices (for example, a PC (Personal Computer) or smartphone owned by the user).
  • the wireless I/F 127 may be an interface conforming to any wireless communication protocol such as Bluetooth (registered trademark), NFC (Near Field Communication), or wireless LAN (Local Area Network).
  • the connection I/F 128 is a wired interface having terminals for connecting the aerosol generating device 10 to other devices.
  • the connection I/F 128 may be, for example, a USB (Universal Serial Bus) interface. Connection I/F 128 may be used to charge battery 140 from an external power supply (via a power supply line not shown).
  • the heating unit 130 is a resistance heating component that heats the aerosol source contained in the aerosol-generating substrate of the tobacco stick 15 to generate an aerosol.
  • the resistance heating material of the heating part 130 for example, one or a mixture of two or more of copper, nickel alloy, chromium alloy, stainless steel, and platinum-rhodium may be used.
  • One end of the heating unit 130 is connected to the positive electrode of the battery 140 via the first switch 131 and the booster circuit 141 , and the other end of the heating unit 130 is connected to the negative electrode of the battery 140 via the second switch 132 .
  • the first switch 131 is a switching element provided on the feeder line between the heating section 130 and the booster circuit 141 .
  • Second switch 132 is a switching element provided in the ground line between heating unit 130 and battery 140 .
  • the first switch 131 and the second switch 132 may be FETs (Field Effect Transistors), for example.
  • the battery 140 is a power source for supplying power to the heating unit 130 and other components of the aerosol generating device 10. In FIG. 3, power supply lines from the battery 140 to components other than the heating unit 130 are omitted.
  • Battery 140 may be, for example, a lithium-ion battery.
  • a booster circuit (DC/DC converter) 141 is a voltage conversion circuit that amplifies the voltage of the battery 140 to supply power to the heating unit 130 .
  • the remaining amount gauge 142 is an IC chip for monitoring the remaining amount of power of the battery 140 and other statuses. The fuel gauge 142 periodically measures the status values of the battery 140, for example, the state of charge (SOC), the state of health (SOH), the relative state of charge (RSOC), and the power supply voltage, A measurement result can be output to the control unit 120 .
  • SOC state of charge
  • SOH state of health
  • RSOC relative state of charge
  • the control unit 120 starts supplying power from the battery 140 to the heating unit 130 when a user input requesting the start of heating is detected.
  • the user input here may be, for example, a long press of a button detected by the input detection unit 122 .
  • the control unit 120 outputs a control signal to the first switch 131 and the second switch 132 to turn on both switches, thereby supplying power from the battery 140 to the heating unit 130 with the voltage amplified by the booster circuit 141. be able to.
  • the first switch 131 and the second switch 132 are FETs
  • the control signal output from the control section 120 to both switches is a control pulse applied to each gate.
  • the control unit 120 adjusts the duty ratio of this control pulse by pulse width modulation (PWM) in temperature control, which will be described later.
  • PWM pulse width modulation
  • the control unit 120 may use pulse frequency modulation (PFM) instead of PWM.
  • the control unit 120 controls the power supply from the battery 140 to the heating unit 130 throughout the heating period, including the preheating period and the suckable period, according to a desired temperature profile to provide a good user experience.
  • control to achieve The control may be mainly feedback control in which the temperature index having a correlation with the temperature of the heating unit 130 is used as a control amount, and the PWM duty ratio is used as an operation amount.
  • PID control shall be adopted as feedback control.
  • the aerosol generating device 10 has two types of measurement units for measuring the temperature index of the heating unit 130 .
  • the measurement circuit 150 shown in FIG. 3 is one of these two types of measurement units, and measures the first temperature index based on the electrical resistance value of the heating unit 130 .
  • Another measuring unit is a thermistor 155, which will be described later.
  • FIG. 4 is a block diagram showing an example of the configuration of measurement circuit 150 shown in FIG.
  • measurement circuit 150 includes voltage dividing resistors 151 , 152 , 153 and operational amplifier 154 .
  • One end of the voltage dividing resistor 151 is connected to the power supply voltage V TEMP and the other end is connected to one end of the voltage dividing resistor 152 .
  • the other end of voltage dividing resistor 152 is grounded.
  • a contact point between the voltage dividing resistor 151 and the voltage dividing resistor 152 is connected to the terminal ADC_VTEMP of the control section 120 .
  • An input to terminal ADC_VTEMP indicates a reference value for resistance measurements.
  • One end of the voltage dividing resistor 153 is connected to the power supply voltage V TEMP and the other end is connected to the power supply line of the heating unit 130 .
  • a contact point between the voltage dividing resistor 153 and the power supply line of the heating unit 130 is connected to a first input terminal of an operational amplifier 154 .
  • a second input terminal of the operational amplifier 154 is grounded.
  • the output terminal of operational amplifier 154 is connected to terminal ADC_HEAT_TEMP of control section 120 .
  • the input to the terminal ADC_HEAT_TEMP indicates a value that varies with the electrical resistance value Rh that depends on the temperature of the heating unit 130 .
  • the control unit 120 can calculate the electrical resistance value Rh of the heating unit 130 based on the ratio of the input value to the terminal ADC_HEAT_TEMP to the input value (reference value) to the terminal ADC_VTEMP.
  • the electrical resistance value of the heating unit 130 has a characteristic that it monotonically increases (that is, has a correlation with the temperature) as the temperature rises, for example. Therefore, in the present embodiment, the control unit 120 uses the electrical resistance value of the heating unit 130 calculated using the measurement circuit 150 as a temperature index (first temperature index) as a controlled variable for PID control. Of course, the controller 120 may further convert the calculated electrical resistance value into temperature using the temperature coefficient of resistance, and use the derived measured temperature as the controlled variable for PID control.
  • the temperature control of the heating unit 130 is performed mainly by determining the PWM duty ratio of power supplied to the heating unit 130 by PID control.
  • the PID control target value resistance value corresponding to the target temperature
  • R TGT [ ⁇ ] the index value (measured resistance value) of the first temperature index in the current control cycle n (n is an integer)
  • R (n) ⁇ ] the duty ratio D(n) of the control cycle n can be derived, for example, according to the following equation (1):
  • K p , K i and K d represent proportional, integral and derivative gains, respectively.
  • saturation control may be applied to the cumulative value of the deviation of the index value from the target value in the second term on the right side, which is the integral term.
  • the cumulative value is replaced with the upper limit value when the cumulative value exceeds the predetermined upper limit value, and the cumulative value is replaced with the lower limit value when the cumulative value is below the predetermined lower limit value.
  • the control unit 120 makes part of the repeated control cycle a measurement period for measuring the first temperature index, and the rest of the control cycle This is a PWM control period for performing PWM control.
  • FIG. 5 is an explanatory diagram for explaining the measurement period and the PWM control period during the heating period.
  • the horizontal axis in the drawing represents time, and the vertical axis represents voltage applied to the heating unit 130 .
  • One control cycle during the heating period consists of an initial measurement period 20 and a remaining PWM control period 30 .
  • the period from t0 to t1 is the measurement period 20 of one control cycle
  • the period from t1 to t2 is the PWM control period 30 of the control cycle.
  • the period from t2 to t3 is the measurement period 20 of the next one control cycle
  • the period from t3 to t4 is the PWM control period 30 of the control cycle.
  • the length of one control cycle corresponds to the period of measurement of the first temperature index, and may be several tens of milliseconds, for example.
  • the control unit 120 applies a very short pulse 21 (for example, a pulse width of 2 ms) to the heating unit 130 a plurality of times (for example, 8 times) during the measurement period 20, and in one measurement period 20,
  • the average value of the resistance values calculated multiple times using the measurement circuit 150 is set as the measured value R(n) of the first temperature index.
  • the control unit 120 uses the measured value R(n), calculates the PWM duty ratio D(n) of the control cycle n according to the above control formula.
  • the control unit 120 applies a pulse 31 having a pulse width W1 corresponding to the product of the length W0 of the period and the duty ratio D(n) to the heating unit 130 (with the same pulse width output a control pulse with W1 to the first switch 131 and the second switch 132).
  • the temperature of the heating unit 130 is controlled so as to approach the target value.
  • the control cycle described above can continue to be repeated.
  • the method of applying a pulse to the heating unit 130 during the measurement period 20 raises the temperature of the heating unit 130 and consumes the remaining battery power, even if the pulse width is short.
  • the desired temperature profile of heating unit 130 may include a period during which the temperature of heating unit 130, once raised to a high value, is lowered to a lower value. It is advantageous not to apply any pulse to the heating unit 130 during this period, in order to efficiently lower the temperature of the heating unit 130 .
  • the measurement circuit 150 cannot be used to measure the first temperature index if no pulse is applied to the heating unit 130 .
  • the aerosol generator 10 further includes a thermistor 155, as schematically shown in FIG.
  • Thermistor 155 is arranged near heating unit 130 and outputs a value dependent on the temperature of heating unit 130 to control unit 120 .
  • Control unit 120 uses the second temperature index based on the output value from thermistor 155 (for example, by comparing the index value with the target value) in the interval in which the temperature of heating unit 130 is lowered, and terminates the interval. Determine when to let On the other hand, control unit 120 controls power supply from battery 140 to heating unit 130 using the first temperature index based on the electrical resistance value of heating unit 130 as described above in other sections.
  • a period of measurement of the second temperature index may be, for example, several tens to several hundreds of milliseconds.
  • FIG. 6 shows an example of the positional relationship between the heating part 130 and the thermistor 155 viewed from the direction 106a (the axial direction of the insertion hole 107) in FIG.
  • tubular member 130a is a member that defines the space of insertion hole 107 for receiving tobacco stick 15 .
  • the cylindrical member 130a is made of a material with high thermal conductivity such as stainless steel (SUS) or aluminum.
  • the film heater 130b is wound around the outer periphery of the cylindrical member 130a.
  • the film heater 130b consists of a pair of films with high heat resistance and insulation, and a resistance heating material sandwiched between the films.
  • the heating unit 130 is composed of the tubular member 130a and the film heater 130b.
  • the heat insulating member 108 is wound so as to surround the outer periphery of the film heater 130b.
  • the heat insulating member 108 is made of glass wool, for example, and protects other components of the aerosol generating device 10 from the heat of the heating unit 130 .
  • the thermistor 155 is arranged outside the heat insulating member 108 .
  • the surface of the film heater 130b is usually smooth, and if the thermistor 155 is arranged on the outer surface of the film heater 130b, positioning tends to be difficult.
  • the provision facilitates the positioning of the thermistor 155 and also achieves good protection of the control circuit connected to the thermistor 155 .
  • the second temperature index based on the output value from the thermistor 155 is displayed with some delay. It will follow changes in temperature.
  • Control unit 120 performs temperature control of heating unit 130 according to a heating profile, which is a control sequence that defines the temporal transition of control conditions for realizing a desired temperature profile.
  • a heating profile is a control sequence that defines the temporal transition of control conditions for realizing a desired temperature profile.
  • the heating profile consists of a plurality of sections that divide the heating period in terms of time, and designates the temperature control specifications for each section using target values and other control parameters.
  • FIG. 7 is an explanatory diagram for explaining the temperature profile and heating profile that can be employed in this embodiment.
  • the horizontal axis in the drawing represents the elapsed time from the start of power supply to the heating unit 130
  • the vertical axis represents the temperature of the heating unit 130 .
  • a thick polygonal line represents a temperature profile 40 as an example.
  • the temperature profile 40 consists of a preheating period (T0-T2) at the beginning and a suckable period (T2-T8) following the preheating period.
  • T0-T2 preheating period
  • T2-T8 suckable period
  • the length of the entire aspirable period may be about 5 minutes, and the user can aspirate a dozen or so times during the aspirable period.
  • the preheating period includes a temperature rising section (T0 to T1) in which the temperature of the heating unit 130 is rapidly increased from the environmental temperature H0 to the first temperature H1, and a maintenance section (T1) in which the temperature of the heating section 130 is maintained at the first temperature H1. ⁇ T2).
  • T0 to T1 a temperature rising section
  • T1 a maintenance section
  • T2 the temperature of the heating section 130 is maintained at the first temperature H1.
  • the suckable period includes a maintenance interval (T2 to T3) in which the temperature of the heating unit 130 is maintained at the first temperature H1, a temperature decrease interval (T3 to T4) in which the temperature of the heating unit 130 is decreased toward the second temperature H2, and A maintenance interval (T4-T5) is included to maintain the temperature of the heating unit 130 at the second temperature H2.
  • T2 to T3 a maintenance interval in which the temperature of the heating unit 130 is maintained at the first temperature H1
  • T3 to T4 in which the temperature of the heating unit 130 is decreased toward the second temperature H2
  • a maintenance interval (T4-T5) is included to maintain the temperature of the heating unit 130 at the second temperature H2.
  • the temperature of the heating unit 130 is further increased gradually from the second temperature H2 to the third temperature H3 (T5 to T6), and the temperature of the heating unit 130 is maintained at the third temperature H3. It includes a maintenance interval (T6-T7) and a temperature-decreasing interval (T7-T8) in which the temperature of the heating unit 130 is lowered toward the environmental temperature H0.
  • T6-T7 maintenance interval
  • T7-T8 temperature-decreasing interval
  • the first temperature H1 may be 295°C
  • the second temperature H2 may be 230°C
  • the third temperature H3 may be 260°C.
  • different temperature profiles may be designed, for example, depending on the design guidelines of the manufacturer, user preferences, or characteristics of each type of tobacco article.
  • the heating profile 50 consists of eight sections S0 to S7 bounded by T1 to T7. However, as will be explained later, the timing of the transition between the two intervals does not necessarily coincide with one of the times T1-T7 shown, but rather according to the termination conditions specified for each interval.
  • the heating profile 50 defines one or more of the control parameters listed below for each of the intervals S0-S7: ⁇ "Section type" ⁇ "Target temperature” ⁇ "Target temperature resistance value” ⁇ "PID control type” ⁇ "gain" ⁇ "Length” ⁇ "Exit conditions"
  • “Section type” is a parameter that specifies whether the section is a PID control section or an OFF section.
  • the PID control section is a section in which PID control is performed based on the first temperature index calculated by the control section 120 using the measurement circuit 150 .
  • the OFF section is a section in which the control unit 120 does not perform PID control and stops power supply to the heating unit 130 .
  • Target temperature is a parameter that specifies the temperature of the heating unit 130 that should be reached at the end of the section.
  • “Target temperature resistance value” is a parameter that designates a value obtained by converting the value of "target temperature” into a resistance value. For example, the target temperature H TGT [°C] can be converted to the target temperature resistance value R TGT [ ⁇ ] according to the following equation (2):
  • H ENV represents the standard environmental temperature
  • ⁇ represents the temperature resistance coefficient of the resistance heating material of the heating unit 130
  • R ENV represents the electrical resistance value at the standard environmental temperature.
  • the values of H ENV , ⁇ and R ENV are all measured or derived in a preliminary evaluation test and stored in the storage unit 121 in advance.
  • PID control type is a parameter that specifies whether the target value is maintained constant at the value of "target temperature resistance value” over the PID control section, or whether the target value is changed linearly by linear interpolation. is. If the “PID control type” is “constant”, the control unit 120 performs feedback control while keeping the target value of temperature control constant in the section. If the “PID control type” is “linear interpolation”, the control unit 120 performs feedback control while changing the target value of temperature control step by step in the section.
  • the control target value in “linear interpolation” is set to a specific start value (e.g., the current measurement value or the target value of the previous interval) at the beginning of the interval, and becomes the "target temperature resistance value” at the end of the interval. can be raised or lowered substantially linearly (actually in steps per control cycle).
  • "PID control type” may be considered, together with “interval type”, to be parameters that specify the control strategy to be applied to temperature control in each interval.
  • Gains is a set of parameters that specify the values of proportional gain K p , integral gain K i , and derivative gain K d for a PID control interval. Note that when a gain value different from the gain value specified in the preceding interval is specified for a certain PID control interval, the cumulative deviation of the integral term of feedback control (the second term on the right side of equation (1)) may be reset. .
  • “Length of time” is a parameter that specifies the length of time defined in advance for each section.
  • “Termination condition” is a parameter that designates a condition for terminating temperature control for each section (that is, a condition for transitioning temperature control to the next section).
  • a “termination condition” may be, for example, any of the following C1, C2 and C3: C1: Elapsed time specified by “time length” C2: Temperature index reaches resistance value specified by "target temperature resistance value” C3: Whichever is earlier of C1 and C2 An internal timer circuit may be provided for determination of C1 and C3.
  • the control unit 120 calculates the coefficient ⁇ ( ⁇ is a positive number slightly smaller than 1) representing the allowable deviation between the temperature index and the target value RTGT when determining the conditions C2 and C3 in the temperature rising section.
  • N COUNT the number of measurement periods 20
  • M is an integer greater than 1
  • Section S0 is the beginning section of the heating profile 50 .
  • the "section type” of the section S0 is the “PID control section", and the “target temperature” is the first temperature H1.
  • the "target temperature resistance value” is a resistance value (hereinafter referred to as R1) corresponding to the first temperature H1.
  • the "PID control type” in section S0 may be "constant”, and in “gain”, the proportional gain Kp is set to a higher value than in other sections, so that the time required for temperature rise is reduced as much as possible. shortened.
  • the “end condition” of section S0 is condition C2, specifically, reaching the resistance value R1 of the first temperature index.
  • the control unit 120 further divides the section S0 into the first half section and the second half section. may be supplied. Thereby, the preheating period can be effectively shortened and delivery of the aerosol to the user can be started quickly.
  • the "section type” of the section S1 is the "PID control section", and the “target temperature” is the first temperature H1.
  • the "target temperature resistance value” is the resistance value R1 corresponding to the first temperature H1.
  • the "PID control type” of section S1 may be “constant”.
  • the “gain” in the section S1 can be set to a value that stabilizes the temperature of the heating unit 130 near the first temperature H1, unlike the case of a rapid temperature rise in the section S0 (for example, in the section S0 A proportional gain with a smaller value than the specified proportional gain may be specified for interval S1).
  • the "length of time” of section S1 can be set to a value within a range of several seconds, for example.
  • the 'end condition' of the section S1 is the condition C1, specifically, the passage of time indicated by the 'length of time'.
  • the control unit 120 activates the timer at the start of the section S1, and when determining that the time indicated by the "length of time" has elapsed, notifies the user of the end of the preheating period.
  • the notification here may be performed by one or both of light emission of the light emitting unit 125 in a predetermined light emission pattern and vibration of the vibrating unit 126 in a predetermined vibration pattern. By sensing this notification, the user recognizes that preparation for suctioning is complete and that suctioning can be started.
  • Start session (S2)> The "section type” of the section S2 is the “PID control section", and the “target temperature” is the first temperature H1.
  • the "target temperature resistance value” is the resistance value R1 corresponding to the first temperature H1.
  • the "PID control type” of section S2 may be “constant”.
  • the "gain” of interval S2 may be the same as interval S1.
  • the "time length” of the section S2 can be set to a value within the range of several seconds to ten and several seconds, for example.
  • the 'end condition' of the section S2 is the condition C1, specifically, the passage of time indicated by the 'length of time'.
  • the user normally starts inhaling the aerosol generated by the aerosol generating device 10 from section S2.
  • the control unit 120 Based on the suction detection signal input from the suction detection unit 124, the control unit 120 measures one or more of the number of times of suction, the frequency of suction, the suction time for each suction, and the cumulative suction time, and obtains the measurement result. may be stored in the storage unit 121 . This measurement can be continuously performed after the section S3.
  • the "section type” of section S3 is “off section", and the "target temperature” is the second temperature H2.
  • the "target temperature resistance value” is a resistance value (hereinafter referred to as R2) corresponding to the second temperature H2. That is, in section S3, control unit 120 stops power supply from battery 140 to heating unit 130 so that the temperature of heating unit 130 decreases toward second temperature H2, which is lower than first temperature H1. . Since section S3 is an off section, "PID control type” and “gain” are not set.
  • the "length of time” of section S3 can be set to a value within the range of several tens of seconds, for example.
  • the "terminating condition” of section S3 is condition C3.
  • the control unit 120 terminates the section S3. However, even before the temperature of the heating unit 130 reaches the second temperature H2, the control unit 120 ends the section S3 when the time indicated by the "time length" has elapsed from the start of the section S3. . In other words, the control unit 120 terminates the section S3 and transitions the temperature control to the section S4 at the earlier of the arrival of the second temperature index to the target value and the elapse of a predetermined time from the start of the section. .
  • the interval S3 ends when the second temperature index reaches the target value earlier than the time (for example, T3 in FIG. 7) at which the time indicated by the “length of time” elapses from the start of the interval S3, the following If the time length of the section is not changed, the total time of the session will be shortened. Premature termination of the session may itself cause user dissatisfaction, or may lead to the inconvenience that the aerosol source contained in the aerosol-generating substrate is not fully depleted. Therefore, if the control unit 120 ends the section S3 earlier than the time indicated by the "time length" of the section S3, the remaining time up to that time is transferred to the subsequent section (for example, the section S4). in addition to the "length of time" specified for FIG.
  • FIG. 8 shows a temperature profile 40a when the remaining time is added to the time length of the subsequent section S4 because the section S3 ends earlier than the predetermined time, in contrast with the temperature profile 40 of FIG. there is
  • the temperature of the heating unit 130 reaches the second temperature H2 at T3a preceding T4.
  • the time length of section S4 is added by the remaining time (T4-T3a).
  • the rate of decrease in the temperature of the heating unit 130 differs depending on the environmental conditions. Beneficial for efficient consumption of resources and improved user satisfaction.
  • the second temperature index based on the output value from thermistor 155 follows the change in temperature of heating unit 130 with some delay. Therefore, if the control unit 120 compares the second temperature index as it is with the target value to determine the end of the section S3, the temperature of the heating unit 130 may be further decreased from the target temperature at the end of the section S3. There is If the temperature of the heating section 130 is too low, the amount of aerosol generated from the aerosol-generating substrate will be small, and the smoking taste will deteriorate. Therefore, in the present embodiment, the control unit 120 corrects the second temperature index so as to compensate for the delay in change of the second temperature index in the interval S3, and compares the corrected index value with the target value.
  • the controller 120 determines whether the temperature of the heating unit 130 has reached the second temperature H2. For the correction of the second temperature indicator, the controller 120 uses a pre-determined relationship between the first temperature indicator and the second temperature indicator. For example, in a section preceding section S3 (for example, section S0), control unit 120 sets the second temperature index based on the output value from thermistor 155 in addition to the first temperature index based on the electrical resistance value of heating unit 130. also get Then, the control unit 120 determines the relationship between the acquired first temperature index and the acquired second temperature index prior to the start of the section S3.
  • a section preceding section S3 for example, section S0
  • control unit 120 sets the second temperature index based on the output value from thermistor 155 in addition to the first temperature index based on the electrical resistance value of heating unit 130. also get Then, the control unit 120 determines the relationship between the acquired first temperature index and the acquired second temperature index prior to the start of the section S3.
  • FIG. 9 is an explanatory diagram for explaining the relationship between the first temperature index and the second temperature index.
  • a solid line graph 61 represents an example of temporal change in the value of the first temperature index when temperature control is performed up to T4 according to the heating profile 50 described using FIG.
  • a dashed-dotted line graph 62 represents an example of temporal changes in the value of the second temperature index when temperature control is performed up to T4 according to the same heating profile 50 .
  • the first temperature index and the second temperature index draw substantially linear trajectories, but the first temperature index
  • the temperature change rate indicated by the second temperature index (slope g 2 in the figure) is relatively small with respect to the temperature change rate indicated by (slope g 1 in the figure), and the first temperature index reaches the target value at T1. Even if it reaches, the second temperature index does not reach the target value.
  • the difference from the target value of the second temperature index gradually decreases from section S1 to section S2 (as the heat of heating unit 130 is transmitted to thermistor 155 via heat insulating member 108), but even at T3, the difference from the target value The difference d1 remains.
  • the section S3, that is, the OFF section starts at T3 the first temperature index and the second temperature index draw a substantially linear graph again while descending.
  • the difference in slope between the two temperature indicators when the temperature of the heating unit 130 is decreased is equal to the difference in slope between the two temperature indicators when the temperature is increased (g 1 ⁇ g 2 ). (However, the sign is reversed). Then, the control unit 120 calculates the second A correction value to be applied to the temperature index can be calculated.
  • the second temperature index is The correction value ⁇ h(t) to be added to the value.
  • the control unit 120 instead of obtaining the slope g1 of the first temperature index and the slope g2 of the second temperature index individually, the control unit 120 causes the value of the second temperature index to reach a value corresponding to the second temperature H2, for example.
  • the difference between the two slopes (g 1 ⁇ g 2 ) may be obtained by dividing the index value difference (d 2 in FIG. 9) at the point in time by the elapsed time up to that point.
  • the above-described relationship between the first temperature index and the second temperature index is acquired and stored in the storage unit 121 before heating is started, not in the interval S0 to the interval S2 immediately before the interval S3. good too.
  • the relationship between the first temperature index and the second temperature index may be obtained in an evaluation test before shipping the aerosol generating device 10 .
  • the control unit 120 may acquire and record the values of the first temperature index and the second temperature index at the start and end of the section S3 in each session. In this case, the control unit 120 corrects the above-described second temperature index based on the difference in the rate of change of the two temperature index values recorded in the past in order to determine the conditions for ending the section S3 of the new session.
  • the values of the two temperature indicators may be recorded in association with the environmental temperature measured by the temperature sensor, and the control unit 120 stores the record corresponding to the environmental temperature at the time of the new session.
  • a correction value for the second temperature index may be calculated based on.
  • the aerosol generating device 10 may have a temperature sensor for measuring the environmental temperature, or may receive environmental temperature data from another device via the wireless I/F 127 or the connection I/F 128. .
  • control unit 120 uses the index value corrected to compensate for the delay in the change of the second temperature index to determine the end condition, so that the temperature of the heating unit 130 in the section S3 is the second temperature index. It is possible to prevent deterioration of the smoking taste by avoiding an excessive decrease exceeding the second temperature H2.
  • the "section type” of section S4 is "PID control section". That is, the control unit 120 restarts the supply of electric power from the battery 140 to the heating unit 130 in response to the transition of the temperature control from the section S3 to the section S4.
  • the "target temperature” of the section S4 is the second temperature H2.
  • the "target temperature resistance value” is the resistance value R2 corresponding to the second temperature H2.
  • the "PID control type” of section S4 may be "constant”.
  • the "gain” of section S4 may be the same as that set in sections S1 and S2.
  • the “length of time” of section S4 can be set, for example, from several tens of seconds to several minutes.
  • the "end condition" of the section S4 is the condition C1, specifically, the passage of time indicated by the “length of time”.
  • the control unit 120 determines that the time indicated by the “length of time” has elapsed, it terminates the section S4 and shifts the temperature control to the section S5.
  • the temperature of the heating unit 130 at the end point may be significantly higher than the second temperature H2.
  • the "gain" of section S4 has a value tuned for the purpose of keeping the temperature constant. Therefore, when the target temperature is set to the second temperature H2 in the section S4 and the PID control is restarted, the temperature of the heating unit 130 becomes unstable due to the deviation of the temperature at the start of the section S4 from the second temperature H2. behavior. Therefore, when the temperature of the heating unit 130 at the end of the section S3 is higher than the second temperature H2, the control unit 120 may treat the temperature at that time as the target temperature of the section S4.
  • FIG. 10 shows two examples of temperature profiles (temperature profiles 41a and 41b) when the target temperature resistance value corresponding to the temperature at the end of section S3 is reset as the target value for PID control in section S4. 7 in contrast to the temperature profile 40 of FIG.
  • a temperature profile 41a is an example in which the temperature H2a at the end of the section S3 is lower than the third temperature H3.
  • a temperature profile 41b is an example in which the temperature H2b at the end of the section S3 is higher than the third temperature H3.
  • the "end condition" of section S3 may be condition C2 as a first modification.
  • the control unit 120 maintains the temperature control of the section S3 until the temperature indicated by the second temperature index reaches the second temperature H2 regardless of the elapsed time from the start of the section S3. Accordingly, it is possible to avoid a situation in which the temperature of the heating unit 130 deviates from the second temperature H2 at the start of the section S4.
  • the target temperature H2 later than the time (for example, T4 in FIG.
  • FIG. 11 shows the temperature profile 42 in the first modification when the section S4 is shortened as a result of the lengthening of the section S3, in comparison with the temperature profile 40 of FIG.
  • the temperature of the heating unit 130 reaches the second temperature H2 at T4a after T4.
  • the time length of section S4 is reduced by the excess time (T4a-T4).
  • the "end condition" of the section S3 is the condition C2, provided that the control unit 120 sets the target temperature of the section S3 when the time indicated by the "time length” of the section S3 has elapsed.
  • the second temperature H2 may be reset to the third temperature H3.
  • the control unit 120 may be subtracted from the "length of time” of section S4 (that is, section S4 may be shortened). As a result, it is possible to avoid excessively increasing the time length of the entire heating period.
  • the "section type” of section S5 is "PID control section”.
  • the "target temperature” of the section S5 is the third temperature H3.
  • the "target temperature resistance value” is a resistance value (hereinafter referred to as R3) corresponding to the third temperature H3.
  • the "PID control type” of section S5 is "linear interpolation". That is, the control unit 120 raises the target value of PID control step by step from the target value (for example, the resistance value R2) of the section S4 to the resistance value R3 from the start to the end of the section.
  • the "gain" of interval S5 may be the same as or different from that set in interval S4.
  • the “length of time” of section S5 can be set, for example, from several tens of seconds to several minutes.
  • the "terminating condition” of section S5 is condition C1. Specifically, the control unit 120 terminates the section S5 and transitions the temperature control to the section S6 when the time indicated by the "length of time” has elapsed since the start of the section S5.
  • the control unit 120 sets the time (for example, T5 in FIG. 7) at which the total time of the "time length” of the section S3 and the "time length” of the section S4 has elapsed from the start of the section S3.
  • T5 time
  • the control unit 120 sets the time (for example, T5 in FIG. 7) at which the total time of the "time length” of the section S3 and the "time length” of the section S4 has elapsed from the start of the section S3.
  • the excess time from that time may be subtracted from the "time length" of the section S5 (that is, the section S5 is shortened).
  • section S4 is skipped.
  • FIG. 13 shows the temperature profile 44 in the first modification when the section S4 is skipped and the section S5 is shortened as a result of the lengthening of the section S3, in comparison with the temperature profile 40 of FIG. there is In the temperature profile 44, the temperature of the heating unit 130 reaches the second temperature H2 at T5a after T5. As a result, the time length of section S5 is reduced by the excess time (T5a-T5).
  • FIG. 14 shows a temperature profile 45 in the second modification when the interval S4 is skipped and the interval S5 is shortened as a result of lengthening the interval S3, in comparison with the temperature profile 40 of FIG. there is In the temperature profile 45, the temperature of the heating unit 130 reaches the third temperature H3 (which is the reset target temperature) at T5b after T5. As a result, the time length of section S5 is reduced by the excess time (T5b-T5).
  • the "section type” of section S6 is "PID control section".
  • the "target temperature” of the section S6 is the third temperature H3.
  • the "target temperature resistance value” is the resistance value R3 corresponding to the third temperature H3.
  • the "PID control type” of section S6 may be “constant”.
  • the "gain” of section S6 may be the same as that set in sections S1, S2 and S4.
  • the "length of time” of section S6 can be set to a value within the range of several tens of seconds, for example.
  • the "end condition” of the section S6 is the condition C1, specifically, the passage of time indicated by the "length of time”. When the control unit 120 determines that the time indicated by the “length of time” has elapsed, it terminates the section S6 and shifts the temperature control to the section S7.
  • the "gain" of section S6 has a value tuned for the purpose of keeping the temperature constant.
  • the target temperature of the section S6 is the third temperature H3, if the temperature at the start of the section S6 deviates significantly from the third temperature H3, the target value of the section S6 is set to the resistance value R3.
  • the temperature of heating unit 130 may exhibit unstable behavior. Therefore, when the temperature of the heating unit 130 at a certain reference point in time (for example, the start point of the interval S6) deviates significantly from the third temperature H3 (for example, higher than the third temperature H3), the temperature at that time may be treated as the target temperature for the section S6.
  • the control unit 120 may reset the target temperature resistance value corresponding to the current temperature at the reference time as the target value of the PID control in the section S6.
  • the temperature of the heating unit 130 in the section S6 can be stabilized.
  • FIG. 15 compares the temperature profile 46 with the temperature profile 40 of FIG. 7 when the target temperature resistance value corresponding to the current temperature at the start of the section S6 is reset as the target value of the PID control in the section S6. is shown.
  • the target temperature is reset to the current temperature H3a higher than the third temperature at T6, and the temperature of the heating unit 130 is maintained at the temperature H3a throughout the section S6.
  • section S7 The "section type" of section S7 is “off section”. In section S7, the temperature of heating unit 130 decreases toward environmental temperature H0. The "target temperature”, “target temperature resistance value” and “gain” in section S7 may not be set. The "time length” of the section S7 can be set to a value within the range of several seconds to several tens of seconds, for example.
  • the 'end condition' of the section S7 is the condition C1, specifically, the passage of time indicated by the 'length of time'. When the control unit 120 determines that the time indicated by the “length of time” has passed, it ends the heating period.
  • the control unit 120 may notify the user that the end of the suckable period is approaching by the light emission of the light emitting unit 125 or the vibration of the vibrating unit 126 at the start of the section S7. Further, the control unit 120 may notify the user that the suckable period has ended by emitting light from the light emitting unit 125 or vibrating the vibrating unit 126 at the end of the section S7.
  • the corrected second temperature index also contains a certain amount of error, and the temperature of the heating unit 130 deviates significantly from the second temperature H2 at the transition to the section S4 (for example, a lower temperature). It is possible that the Therefore, as a third modification, the control unit 120 acquires the first temperature index when starting the interval S4, and in the interval S4, depending on the temperature of the heating unit 130 indicated by the acquired first temperature index, Different sets of control parameters may be used to control the power supply from battery 140 to heating unit 130 .
  • the temperature of the heating unit 130 indicated by the first temperature index when the section S4 is started is assumed to be H2C .
  • the control unit 120 restores (increases) the temperature of the heating unit 130 to the second temperature H2. using the first set of control parameters of
  • the control unit 120 uses the second control parameter set for maintaining the temperature of the heating unit 130 at the temperature H2C. do.
  • the first control parameter set includes a feedback control proportional gain value K p1
  • the second control parameter set includes a feedback control proportional gain value K p2
  • K p1 is greater than K p2
  • the values of one or both of the integral gain and the derivative gain may differ between the first control parameter set and the second control parameter set. In this way, by switching the control parameter set for feedback control depending on the temperature of the heating unit 130 at the start of the section S4, the temperature of the heating unit 130 reaches the desired temperature (for example, the second temperature H2) in the middle of the session. It is possible to suppress the deviation from and reduce the deterioration of the smoking taste.
  • control unit 120 changes the control parameter set from the first control parameter set to the second temperature. may be switched to the control parameter set of Typically, it is assumed that an excessive temperature drop of the heating unit 130 due to the error of the corrected second temperature index, if any, is small. Therefore, by switching the control parameter set to the second control parameter set after recovering the temperature of heating unit 130 in a short time, the stability of the temperature of heating unit 130 in section S4 can be improved.
  • FIG. 16 shows an example of the temperature profile when the section S4 includes the recovery section in the third modification.
  • the temperature H2c at the start of the section S4 is lower than the second temperature H2. Therefore, the control unit 120 sets the recovery interval S4a at the beginning of the interval S4, and performs PID control using the first control parameter set including the larger proportional gain value Kp1 .
  • the target value for PID control may be the resistance value R2 corresponding to the second temperature H2. Through this PID control, the temperature of the heating unit 130 recovers to the second temperature H2 at T4c.
  • control unit 120 causes the temperature control to transition from the recovery interval S4a to the maintenance interval S4b , and switches the control parameter set for PID control to the second control parameter set including the proportional gain value Kp2. Thereby, the temperature of the heating unit 130 is maintained near the second temperature H2 until reaching T5.
  • control unit 120 may also perform threshold determination in consideration of the above-described coefficient ⁇ representing the allowable deviation when determining whether the first temperature index has reached the target value R2 in the recovery section S4a. Further, the condition for ending the recovery section S4a (transition to the maintenance section S4b) may be that the first temperature index reaches the threshold value M times.
  • the first control parameter set used in the recovery section S4a may be the same as the control parameter set used during the initial temperature increase of the heating unit 130 in the section S0.
  • the proportional gain value Kp1 of the first control parameter set may be equal to the proportional gain value used during the initial heating.
  • Configuration example of profile data> It is beneficial to define a structured, canonical data format that can describe the operational specifications of each section of the heating profile 50 described thus far.
  • the standard data format changes the temperature control contents by switching the heating profile 50 in various situations such as upgrading the operation specifications, changing the type of tobacco article, and selecting a temperature profile that matches the user's preference. make things easier.
  • FIG. 17A is an explanatory diagram showing a first example of the configuration of the profile data 51.
  • the profile data 51 includes seven information elements such as section number 52, control method 53, target temperature 54, target temperature resistance value 55, gain 56, time length 57 and end condition 58.
  • the section number 52 is a number (identifier) for identifying each section.
  • the control method 53 is an information element that designates a control method to be applied to temperature control in each section among a plurality of control methods.
  • the control method 53 corresponds to a combination of the control parameters "section type” and "PID control type” described above, and can take any value of "0", "1" and "2". can.
  • the control method 53 of section S n indicates the value "1", which indicates that the control method to be applied to the section is PID control and the control target value is kept constant in the section. Represents what to do.
  • the control method 53 of the section S n+1 indicates a value of “0”, which means that the control method to be applied to the section is to stop the power supply to the heating unit 130 . That is, section Sn+1 in this example is an OFF section.
  • the control method 53 of the section Sn+2 indicates the value "2", which indicates that the control method to be applied to the section is PID control and the control target value should be changed linearly in the section.
  • the target temperature 54 and target temperature resistance value 55 are information elements that specify the above-described control parameters "target temperature” and “target temperature resistance value”, respectively. Note that the target temperature resistance value 55 may be omitted from the profile data 51 when temperature control is performed using the temperature itself as a control amount.
  • a gain 56 is an information element that specifies the control parameter set "gain" described above. For off intervals, gain 56 may be blank.
  • a time length 57 and an end condition 58 are information elements that specify the above-described control parameters "time length" and "end condition", respectively.
  • FIG. 17B is an explanatory diagram showing a second example of the configuration of the profile data 51.
  • the profile data 51 includes a common area 51a and section-specific areas 51b.
  • the common area 51a is a data area in which common information is described over a plurality of sections.
  • common area 51a includes three information elements 59a, 59b and 59c.
  • the information element 59a designates a number (identifier) for uniquely identifying the control profile described by the profile data.
  • Information element 59b specifies the first gain set K1 and information element 59c specifies the second gain set K2.
  • Gain set K 1 includes proportional gain value K p1 , integral gain value K i1 and derivative gain value K d1
  • gain set K 2 includes proportional gain value K p2 , integral gain value K i2 and derivative gain value K d2 .
  • the section-specific area 51b is a data area in which information unique to each section is described.
  • the section-specific area 51 b includes six information elements: section number 52 , target temperature 54 , target temperature resistance value 55 , gain 56 , time length 57 and end condition 58 .
  • the control scheme 53 shown in FIG. 17A is omitted. Instead, a target temperature 54 value greater than zero indicates that the PID control scheme should be applied to that interval.
  • the value of the target temperature 54 indicates zero, it means that the section is the OFF section.
  • the target temperature 54 indicates zero for the interval Sn + 1, so the interval Sn+1 is an OFF interval.
  • the gain 56 designates either the gain set K1 or the gain set K2 instead of the specific values of the three types of gains as in the example of FIG . 17A.
  • gain set K1 is designated for section Sn
  • gain set K2 is designated for section Sn+2 and section Sn + 3 .
  • one of the limited number of options defined in the common area 51a can be designated in the section-specific area 51b, thereby avoiding redundant definition of values and defining the profile data 51.
  • Data size can be reduced.
  • other control parameters such as temperature or resistance may also be specified in this manner using common area 51a.
  • a structured standard data format like the profile data 51 described above may be allocated to a predetermined data area in the storage unit 121, and the data in the data area may be rewritable. This makes it possible to change the contents of the temperature control executed by the control unit 120 simply by rewriting the profile data 51 without changing the control program. At this time, control unit 120 simply reads the latest content from the same data area of storage unit 121 and uses it.
  • profile data 51 is not limited to the examples shown in FIGS. 17A and 17B.
  • Profile data 51 may include additional information elements, or some of the illustrated information elements may be omitted.
  • profile data 51 may include one or more of the following as common information across multiple intervals: ⁇ Name of heating profile ⁇ Version number of heating profile ⁇ Number of sections constituting heating profile ⁇ Calibration value to be added to temperature or resistance value to absorb manufacturing tolerance of resistance-temperature characteristics of heating part for each product (Can be written based on test results before product shipment)
  • the profile data 51 may additionally include one or more of the following as information that can be specified for each section: ⁇ Whether to determine the duty ratio of power supply to the heating part by PID control or use the maximum duty ratio ⁇ Whether to reset the cumulative deviation of the integral term of PID control at the start of the section ⁇ Whether to detect an abnormality kinds
  • control methods that can be specified by the profile data 51 include a method in which power supply (for heating) to the heating unit 130 is stopped, but pulses for measuring temperature or resistance are applied to the heating unit 130. It's okay.
  • a section in which such a control method is designated may be referred to as an "off section".
  • the profile data 51 may be capable of designating end conditions other than the conditions C1 to C3 described above for each section.
  • specifiable termination conditions may include conditions based on the number of aspirations detected or the total time of aspiration.
  • control parameters of the heating profile 50 described in this section may be described in a separate storage area instead of being described in the profile data 51, or may be described in the program code of the control program.
  • control unit 120 While the control unit 120 performs temperature control according to the heating profile 50 described in the profile data 51, it monitors whether the operation of the aerosol generator 10 is normal. When detecting an abnormality, the control unit 120 stops the supply of power from the battery 140 to the heating unit 130, stores an error code indicating the type of the detected abnormality in the storage unit 121, and notifies the user of the occurrence of the abnormality. .
  • Several types of anomalies that may be detected by control unit 120 in relation to temperature control of heating unit 130 will now be described.
  • control unit 120 monitors the amount of change in the first temperature index per predetermined time interval while power is being supplied to heating unit 130 in interval S0. Then, when the amount of change in the first temperature index is below the threshold, the control unit 120 determines that there is a possibility that a malfunction has occurred in the measurement circuit 150, and stops power supply from the battery 140 to the heating unit 130.
  • the threshold here may be, for example, a temperature change of 10° C. (change in resistance value corresponding to 10° C.) during a time interval of 3 seconds.
  • the control unit 120 determines that the temperature of the heating unit 130 has not reached the target temperature when a predetermined time has elapsed from the start of heating in the section S0. When determined from the temperature index, power supply from the battery 140 to the heating unit 130 is stopped.
  • the predetermined time here may be equal to the length of time specified by the heating profile 50 for the section S0 (or may be defined separately from the heating profile 50), for example 60 seconds.
  • control unit 120 sets the temperature of heating unit 130 indicated by the first temperature index to is compared with the first temperature H1.
  • the control unit 120 determines that the heating unit 130 is overheated, and controls the temperature according to the heating profile 50. exit. Overheating detection based on the first temperature index may be performed not only when heating is restarted, but also periodically during sections other than the OFF section.
  • the control unit 120 may compare the temperature of the heating unit 130 indicated by the second temperature index with the first temperature H1 in the interval S3 so that the overheating state of the heating unit 130 can be detected even in the OFF interval. In this case as well, the control unit 120 determines that the heating unit 130 is overheated when it is determined that the temperature of the heating unit 130 is higher than the first temperature H1, and follows the heating profile 50. end the temperature control. As a result, it is possible to increase the possibility of early detection of an overheating state caused by some problem during the off period.
  • Abnormality detection may be performed periodically as part of the normal control routine of the control unit 120, or may be performed at specific timing such as the start of heating or the transition of sections.
  • a detection circuit separate from the control unit 120 may detect an anomaly and notify the control unit 120 of the detected anomaly (for example, by an interrupt signal).
  • FIG. 18 is a flow chart showing an example of the overall flow of aerosol generation processing according to one embodiment.
  • control unit 120 monitors an input signal from the input detection unit 122 and waits for a user input requesting the start of heating (for example, a long press of a button).
  • a user input requesting the start of heating for example, a long press of a button.
  • the controller 120 checks the state of the aerosol generator 10 to start heating.
  • the state check here may include arbitrary check conditions, such as whether the remaining power of the battery 140 is sufficient and whether the front panel 102 has fallen off. If one or more check conditions are not met, heating is not initiated and processing returns to S101. If all check conditions are satisfied, the process proceeds to S105.
  • control unit 120 reads the profile data 51 from a predetermined storage area of the storage unit 121. Subsequent steps S107 to S133 are repeated for each of a plurality of sections included in heating profile 50 described in profile data 51 .
  • control unit 120 determines whether the current section is a PID control section or an OFF section based on the "section type" that specifies the control method to be applied to the current section. If the current section is the PID control section, the process proceeds to S110. On the other hand, if the current section is an OFF section, the process proceeds to S120.
  • control unit 120 performs temperature control processing for the PID control section so that the temperature of the heating unit 130 reaches the temperature specified for the current section. A more specific flow of the temperature control process executed here will be further described later.
  • control unit 120 performs temperature control processing for the off period so that the temperature of the heating unit 130 decreases toward the temperature specified for the current period. A more specific flow of the temperature control process executed here will be further described later.
  • the control unit 120 determines whether the heating profile 50 has the next section in S131. If there is a next section in the heating profile 50, the temperature control transitions to the next section in S131, and the above-described S107 to S133 are repeated with the next section as the current section. If there is no next section, the aerosol generation process of FIG. 18 ends.
  • FIG. 19 is a flow chart showing an example of the flow of temperature control processing for the PID control section executed in S110 of FIG.
  • the control unit 120 acquires the target temperature and time length specified in the heating profile 50 for the current section, and sets end conditions for the current section. For example, when the termination condition is condition C1 or C3, the control unit 120 sets the specified length of time in the timer and starts the timer. If the end condition is condition C2 or C3, the control unit 120 sets a control threshold (for example, a threshold considering the allowable deviation) to be compared with the first temperature index based on the designated target temperature. .
  • a control threshold for example, a threshold considering the allowable deviation
  • the control unit 120 sets the PID control parameters for the current section. For example, the control unit 120 sets the target temperature resistance value, the proportional gain, the integral gain, and the differential gain as target values for PID control to the values specified in the heating profile 50 for the current section.
  • S113 to S118 are repeated for each control cycle.
  • the control unit 120 determines whether or not to linearly interpolate the target value of PID control.
  • linear interpolation is specified as the "PID control type" of the heating profile 50 for the current section
  • the control unit 120 changes the target value of the PID control step by step in each control cycle in S114. Reset by linear interpolation. If “constant” is specified as the "PID control type" for the current section, S114 is skipped.
  • the control unit 120 uses the measurement circuit 150 to obtain a first temperature index based on the electrical resistance value of the heating unit 130 .
  • the index value acquired here may be, for example, the average value of the results of multiple resistance value measurements, as described with reference to FIG.
  • control unit 120 determines whether or not the conditions for ending the current section set in S111 are satisfied. If it is determined that the end condition of the current section is not satisfied, the process proceeds to S117.
  • the control unit 120 calculates the PWM duty ratio for the latest control cycle according to the PID control formula described using formula (1).
  • the control unit 120 supplies power from the battery 140 to the heating unit 130 by outputting a control pulse having a pulse width based on the calculated duty ratio to the first switch 131 and the second switch 132 .
  • FIG. 20A is a flow chart showing a first example of the flow of the temperature control process for the off period executed in S120 of FIG.
  • control unit 120 acquires the target temperature and time length specified in the heating profile 50 for the current section, and sets end conditions for the current section.
  • An example of setting for each termination condition here may be the same as that described in relation to S111 of FIG.
  • control unit 120 acquires a second temperature index based on the output value from the thermistor 155.
  • control unit 120 sets the value of the second temperature index obtained in S122 to a value that is previously determined between the first temperature index and the second temperature index so as to compensate for the delay in change of the value. are corrected using the relationship
  • the control unit 120 determines whether or not the condition for ending the current section set in S121 is satisfied based on the value of the second temperature index corrected in S123. If it is determined that the end condition of the current section is not satisfied, the process returns to S122, and the above-described S122 to S124 are repeated. If it is determined that the end condition of the current section is satisfied, the temperature control process of FIG. 20A ends.
  • FIG. 20B is a flow chart showing a second example of the flow of the temperature control process for the off period executed in S120 of FIG.
  • S121 to S124 in FIG. 20B may be the same processing steps as S121 to S124 in FIG. 20A, description thereof will be omitted here.
  • the control unit 120 determines in S125 whether or not the current section will end earlier than the predetermined time.
  • the predetermined time is the time at which the length of time acquired in S121 elapses from the start time of the current section. If the current section ends earlier than the predetermined time, the control unit 120 adds the remaining time until the predetermined time to the length of time specified by the heating profile 50 for the subsequent section of the current section in S126.
  • FIG. 20C is a flow chart showing a third example of the flow of the temperature control process for the off period executed in S120 of FIG.
  • S121 to S126 of FIG. 20C may be the same processing steps as S121 to S126 of FIG. 20B, except that the process proceeds to S127 when it is determined in S125 that the current section does not end earlier than the predetermined time. Therefore, their description is omitted here.
  • control unit 120 determines whether the current section ends later than the predetermined time. If the current section ends later than the predetermined time, the controller 120 subtracts the excess time from the predetermined time from the length of time specified by the heating profile 50 for the subsequent section of the current section in S128.
  • control unit 120 skips the temperature control for the subsequent section, and Deductions of hours from the length of time specified may be made.
  • FIG. 21 is a flowchart showing an example of the flow of end determination processing corresponding to S116 of FIG. 19 that can be applied to section S0.
  • the end determination process shown in FIG. 21 may be applied to the recovery segment S4a.
  • control unit 120 acquires a control threshold value equal to the product of the target temperature control value for the current section and the coefficient representing the allowable deviation. Note that this processing step need only be performed once at the beginning of each interval.
  • the control unit 120 determines whether or not the index value of the first temperature index exceeds the control threshold acquired in S141.
  • the process proceeds to S143.
  • the index value of the first temperature index does not exceed the determination threshold, the process proceeds to S145.
  • the control unit 120 adds 1 to (increments) a counter N COUNT for counting the number of times the threshold is satisfied. Note that the counter N COUNT is initialized to zero at the beginning of each interval.
  • the control unit 120 determines whether or not the counter N COUNT has reached the determination threshold value M. Here, if the counter N COUNT has reached the determination threshold value M, the process proceeds to S146. On the other hand, if the counter N COUNT has not reached the determination threshold value M, the process proceeds to S145.
  • control unit 120 determines that the termination condition has not yet been satisfied for the current section. On the other hand, in S146, control unit 120 determines that the end condition is satisfied for the current section. Then, the end determination process of FIG. 21 ends.
  • FIG. 22 is a flowchart showing an example of the flow of end determination processing corresponding to S124 in FIG. 20A or 20B that can be applied to section S3.
  • control unit 120 acquires the value currently indicated by the timer started at the start of the current section.
  • control unit 120 determines whether or not a predetermined period of time has elapsed since the start of the current section based on the acquired timer value.
  • the predetermined length of time here may be the length of time specified by the heating profile 50 for the current segment. If it is determined that the predetermined time has passed, the process proceeds to S157. On the other hand, if it is determined that the predetermined time has not elapsed, the process proceeds to S153.
  • control unit 120 determines whether or not the corrected index value of the second temperature index has reached the target value. Here, if the corrected index value reaches the target value, the process proceeds to S154. On the other hand, if the corrected index value has not reached the target value, the process proceeds to S156.
  • control unit 120 adds 1 to (increments) counter N COUNT .
  • the control unit 120 determines whether or not the counter N COUNT has reached the determination threshold value M.
  • the process proceeds to S157.
  • the process proceeds to S156.
  • control unit 120 determines that the termination condition has not yet been satisfied for the current section. On the other hand, in S157, control unit 120 determines that the termination condition is satisfied for the current section. Then, the end determination process of FIG. 22 ends.
  • FIG. 23 is a flowchart showing an example of the flow of control parameter selection processing that can be executed at the beginning of section S4 (for example, S112 in FIG. 19) in the third modified example described above.
  • control unit 120 uses the measurement circuit 150 to acquire a first temperature index based on the electrical resistance value of the heating unit 130 .
  • the control unit 120 obtains a control threshold value equal to the product of the target temperature control value for the current section and the coefficient representing the allowable deviation.
  • the control unit 120 determines whether or not the index value of the first temperature index is greater than or equal to the control threshold. If the index value of the first temperature index is below the control threshold, in S164, the control unit 120 sets the control parameters for PID control in the current section to the first control parameter set for recovering the temperature of the heating unit 130. set based on On the other hand, if the index value of the first temperature index is greater than or equal to the control threshold, in S165 the control unit 120 changes the control parameter for PID control in the current section to the second control parameter for maintaining the temperature of the heating unit 130. Set based on control parameter set. At this time, the control unit 120 may reset the current temperature of the heating unit 130 as the target value of the temperature control for the current section.
  • FIG. An aerosol generating device comprises: a heating unit that heats an aerosol source to generate an aerosol; - a power source that supplies power to the heating unit; - a thermistor that outputs a value dependent on the temperature of the heating unit; - supplying power from the power source to the heating unit, - a first section in which a target value for temperature control of the heating unit is set to a value corresponding to a first temperature and power is supplied from the power source to the heating unit; - a second section, following the first section, in which the supply of power from the power supply to the heating unit is stopped so that the temperature of the heating unit decreases toward a second temperature lower than the first temperature; as well as, - a third section, following the second section, in which power is supplied from the power source to the heating unit; a control unit that controls according to a control sequence that includes
  • the second section in which the temperature of the heating section is lowered toward the second temperature, it becomes unnecessary to apply a pulse to the heating section for measuring the temperature, and the power supply from the power supply to the heating section is reduced.
  • the temperature of the heating unit can be efficiently reached to the second temperature. Since the arrival of the target temperature in the second section is determined based on the output value from the thermistor, the transition timing from the second section to the third section is not missed even if the pulse is not applied to the heating unit. .
  • the power supply is controlled using the temperature index based on the electrical resistance value of the heating part, so the measured temperature keeps good followability to the actual temperature for temperature control. be able to.
  • An aerosol generating device comprises: a heating unit that heats an aerosol source to generate an aerosol; - a power source that supplies power to the heating unit; a control unit that controls the supply of power from the power source to the heating unit using a temperature index related to the temperature of the heating unit according to a control sequence consisting of a plurality of intervals; with - the control sequence is described by structured data including a first information element specifying a control method to be applied to temperature control in each section from among a plurality of control methods; - The plurality of control methods include a first method of performing feedback control using the temperature index, and a second method of stopping power supply from the power supply to the heating unit.
  • An aerosol generating device comprises: a heating unit that heats an aerosol source to generate an aerosol; - a power source that supplies power to the heating unit; - supplying power from the power source to the heating unit, - a first section for changing the temperature of the heating section from a first temperature towards a second temperature; and - a second section following the first section for maintaining the temperature of the heating section.
  • a control unit that controls according to a control sequence consisting of a plurality of sections including with - the control sequence specifies a first length of time for the first section and a second length of time for the second section; - The control unit terminates the first section when the temperature of the heating unit reaches the second temperature, When the first section ends earlier than a first time when the first time length elapses from the start of the first section, the control unit controls the remaining time until the first time and the second time. Let the second interval continue for a total length of time.
  • the time during which the user can enjoy sucking is the first. Only the remaining time of one section is compensated. As such, it is possible to avoid a situation in which the user experience is compromised due to an early termination of the session, while maintaining proper temperature control.

Landscapes

  • Control Of Resistance Heating (AREA)

Abstract

Ce dispositif de génération d'aérosol est pourvu d'une unité de chauffage qui chauffe une source d'aérosol pour générer un aérosol, une source d'alimentation qui fournit de l'énergie à l'unité de chauffage, et une unité de commande qui commande l'alimentation électrique de la source d'alimentation à l'unité de chauffage selon une séquence de commande constituée d'une pluralité de sections, en utilisant un indice de température lié à la température de l'unité de chauffage. La séquence de commande est décrite par des données structurées comprenant un premier élément d'informations spécifiant parmi une pluralité de modes de commande un mode de commande à appliquer à la commande de température de chaque section. La pluralité de modes de commande comprend un premier mode de réalisation d'une commande de rétroaction à l'aide de l'indice de température, et un deuxième mode d'arrêt de l'alimentation électrique de la source d'alimentation à l'unité de chauffage.
PCT/JP2022/006893 2021-04-28 2022-02-21 Dispositif de génération d'aérosol, procédé de commande et programme informatique WO2022230320A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020029923A1 (fr) * 2018-08-07 2020-02-13 深圳市合元科技有限公司 Procédé de commande de cigarette électronique, dispositif de cigarette électronique et support de stockage informatique
WO2020084776A1 (fr) * 2018-10-26 2020-04-30 日本たばこ産業株式会社 Unité de commande, dispositif de génération d'aérosol, procédé et programme de commande de dispositif de chauffage, et article à fumer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020029923A1 (fr) * 2018-08-07 2020-02-13 深圳市合元科技有限公司 Procédé de commande de cigarette électronique, dispositif de cigarette électronique et support de stockage informatique
WO2020084776A1 (fr) * 2018-10-26 2020-04-30 日本たばこ産業株式会社 Unité de commande, dispositif de génération d'aérosol, procédé et programme de commande de dispositif de chauffage, et article à fumer

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