Infrared Aerosol Heater Puff Detection via Housing Temperature
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Solution Overview
Problem
Existing aerosol generating devices face challenges in accurately detecting puffing actions due to the complexity of airway structures and the lack of sensitivity in temperature-based detection methods, particularly when using heating elements that do not effectively cool during puffing.
Innovation Solution
The device incorporates a heating structure with a heating element that generates infrared light, a temperature measurement unit to monitor temperature changes, and a control unit to detect puffing actions based on these changes, eliminating the need for complex airway structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an airflow sensor is used to detect puffing action, then detection accuracy is improved, but device complexity increases due to complicated airway structure
Solution Approach 1:
The patent extracts the puff detection function from the complex airflow sensor system and implements it using the existing heating element and temperature measurement unit. By measuring temperature changes of the heating structure during puffing, the system achieves accurate detection without requiring complicated airway structures or additional airflow sensors.
Solution Approach 2:
The heating element serves multiple functions: it heats the aerosol-forming substrate to generate aerosol, and simultaneously acts as a temperature source whose temperature changes can be measured to detect puffing actions. The temperature measurement unit, originally intended for monitoring heating element temperature, is also used for puff detection, eliminating the need for separate detection components.
2Device complexity
If temperature measurement of heating element is used for puff detection, then device structure is simplified, but detection sensitivity decreases because heating element does not cool effectively during puffing
Solution Approach 1:
The patent introduces an intermediary approach by measuring the temperature of the heating structure (which includes the heating element and its surrounding housing) rather than directly measuring the heating element itself. The heating structure has greater thermal mass and cools more effectively during puffing due to airflow, providing sufficient temperature changes for sensitive detection while maintaining structural simplicity.
Solution Approach 2:
The system changes the measurement parameter from direct heating element temperature to heating structure temperature. This parameter change allows for effective thermal response to puffing airflow while maintaining system simplicity. The heating structure's temperature dynamics provide sufficient sensitivity for detection without requiring complex modifications to the heating element itself.
3Ease of manufacture
If heating element is used for both heating and temperature measurement, then cost is reduced, but temperature measurement accuracy may be affected by self-heating effects
Solution Approach 1:
The system performs preliminary heating to bring the heating structure to a stable operating temperature before attempting to detect puffing actions. By establishing a baseline temperature and ensuring thermal stability beforehand, the system can distinguish between temperature changes caused by puffing airflow and those caused by normal heating operations, improving measurement accuracy.
Solution Approach 2:
The control unit continuously monitors the temperature of the heating structure and uses this feedback to distinguish between temperature changes due to puffing and those due to heating. By comparing temperature dynamics against expected heating curves and detecting anomalous cooling patterns, the system can accurately identify puffing events even while the heating element is actively heating.
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
This approach enhances puff detection sensitivity by measuring temperature changes, simplifies the device structure, and reduces costs without relying on airflow sensors, ensuring accurate puff detection and efficient aerosol generation.
Implementation Method 1
the heating element is configured to be powered for heating and generating infrared light
Implementation Method 2
the infrared light passing through the housing so as to heat an aerosol-forming substrate
Implementation Method 3
the temperature measurement unit is arranged on the heating structure or is spaced apart from the heating structure, and is configured to measure a temperature of the heating structure
Data Source
AI summary
An aerosol generating device includes: a heating structure; a temperature measurement unit; and a control unit. The heating structure has a heating element and a housing. The heating element is at least partially spaced apart from the housing, the heating being powered for heating and generating infrared light, the infrared light passing through the housing so as to heat an aerosol-forming substrate. The temperature measurement unit is arranged on the heating structure or is spaced apart from the heating structure, and measures a temperature of the heating structure. The control unit monitors the temperature of the heating structure and detect a puffing action of a user according to a change in the temperature of the heating structure.