Aerosol Generating Device Two-Stage Puff Detection Control

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Solution Overview

Problem

Existing aerosol generating devices using ceramic wicks face challenges in accurately determining puff start and end times, leading to unnecessary energization and inconsistent aerosol generation, which can result in an unnatural smoking experience.

Innovation Solution

The device incorporates a power source, sensor, and controller that adjust power supply based on measured values, using multiple thresholds and conditions to optimize aerosol generation timing and prevent unnecessary energization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the threshold to determine puff start time is made small, then the responsiveness of aerosol generation is improved, but unnecessary energization occurs due to noise pickup

Engineering Contradiction:

Improveresponsiveness of aerosol generationVSAvoidaccuracy of puff detection

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The single threshold determination is segmented into a two-stage process: first determining puff start timing when the measured value exceeds the first threshold, then separately determining puff end timing when the measured value falls below the second threshold. This segmentation allows optimized threshold values for each stage, improving both responsiveness and reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system performs preliminary action by setting the first threshold lower than the second threshold, allowing the puff start to be detected early when the measured value first exceeds the first threshold. This preliminary detection enables rapid aerosol generation start while the higher second threshold prevents false triggering from noise.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If the threshold to determine puff end time is larger than the threshold to determine puff start time, then the puff end condition is satisfied at appropriate timing, but the determination becomes inconsistent with simple comparison methods

Engineering Contradiction:

Improveaccuracy of puff end timingVSAvoidcomplexity of control logic

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The control logic dynamically adapts to the two-threshold structure: during puff generation, the system monitors whether the measured value exceeds the first threshold to maintain energization, and separately checks whether it falls below the second threshold to terminate energization. This dynamic adaptation simplifies the control logic while achieving precise timing.

Inventive Principle:

Principle #15Dynamics

3Ease of manufacture

If ceramic wick is used instead of glass fiber, then the manufacturing process is simplified and aerosol yield is improved, but the thermal capacity increases requiring adjusted energization timing

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidadaptability of control parameters

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The system changes the control parameters (threshold values and their relationship) to adapt to the different thermal characteristics of ceramic wicks. By setting the first threshold lower than the second threshold, the system compensates for the higher thermal capacity of ceramic material, allowing appropriate energization timing adjustments while maintaining simple manufacturing benefits.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution allows for precise control of aerosol generation, ensuring appropriate timing and reducing unnecessary power consumption, thereby enhancing the user's smoking experience.

Implementation Method 1

a sensor that outputs a measured value for controlling the power supplied

Methodology Applied

Scientific EffectInhalation detection:

Implementation Method 2

a power source that supplies power to perform atomization of an aerosol source and/or heating of a flavor source

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 3

perform atomization of an aerosol source

Methodology Applied

Scientific EffectAtomization: Evaporation

Data Source

PatentUS20250204603A1Aerosol generating device, method of controlling aerosol generating device, and program

Publication Date: 2025.06.26 JAPAN TOBACCO INC

AI summary

An is an aerosol generating device which is capable of generating an aerosol at an appropriate timing includes: a power source which supplies power in order to atomize an aerosol source and/or heat a flavor source; a sensor which outputs a measurement value for controlling the power supplied; and a controller which controls the power supplied on the basis of the measurement value. The controller controls a power supply amount from the power source to be a first value when the measured value is equal to or larger than a first threshold and smaller than a second threshold larger than the first threshold, and the power supply amount to be larger than the first value when the measured value is equal to or larger than the second threshold.