Aerosol Device TPM Density Control via Flow Feedback
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Solution Overview
Problem
Aerosol-generating devices fail to increase total particulate matter (TPM) production in response to stronger inhalations or puffs, often resulting in decreased TPM generation due to the cooling effect of higher flow rates, which contradicts user expectations and provides a less desirable experience.
Innovation Solution
An aerosol-generating device with a flow sensor and controller that adjusts the production of TPM based on the flow rate and target TPM density, ensuring a consistent TPM production rate by modifying the power delivered to the heating element in response to changes in airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a higher flow rate is achieved through stronger inhalations or puffs, then the cooling effect on the heat source increases, but the total particulate matter generation rate decreases
Solution Approach 1:
The controller monitors the flow rate through a flow sensor and adjusts the power delivered to the heating element in real-time based on the detected airflow conditions. This closed-loop feedback system ensures that TPM density is maintained despite variations in inhalation strength, resolving the contradiction between flow rate and TPM generation rate.
Solution Approach 2:
The system dynamically changes the power parameter delivered to the heating element based on the detected flow rate. When flow rate increases (stronger puff), the controller increases power to compensate for cooling effects and maintain TPM density. This parameter adjustment resolves the contradiction by adapting the heating intensity to match airflow conditions.
2Quantity of substance
If power is increased to maintain TPM density during higher flow rates, then TPM production is maintained, but energy consumption increases
Solution Approach 1:
The controller applies power adjustment only when and to the extent necessary to maintain TPM density during varying flow conditions. Rather than continuously operating at maximum power, the system applies partial power increases only during stronger inhalations where cooling effects reduce TPM generation, thus avoiding unnecessary energy consumption while maintaining TPM production.
3Stability of the object's composition
If the heating element power is dynamically adjusted based on flow rate, then TPM density is maintained, but device complexity increases
Solution Approach 1:
A flow sensor detects airflow conditions and provides feedback to the controller, which automatically adjusts heating power to maintain TPM density. This feedback mechanism resolves the contradiction by providing automated control that maintains composition stability without requiring complex manual intervention or overly sophisticated control algorithms.
Solution Approach 2:
The device performs self-adjustment of heating power based on its own operational conditions (flow rate). The controller monitors its own performance and automatically compensates for variations, making the system self-regulating and reducing the need for external control mechanisms or complex user intervention.
Data Source
AI summary
Systems, devices, and methods may control total particulate matter (TPM) production based on air flow rate and TPM density. TPM density is a TPM production rate per flow rate of gas through an aerosol-generating device. The systems, devices, and methods may measure, or sample, air flow during a puff or draw on an aerosol-generating device. The aerosol-generating device may, in turn, adjust the production of the TPM based on the measured air flow rate and a selected, or desired, TPM density, which may be pre-set in the device and/or subsequently set as desired.