Piezoresistive Puff Sensor Layout for Aerosol Generators
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Solution Overview
Problem
Existing aerosol generating devices face challenges in accurately detecting user puffs due to contamination and limited arrangement locations of pressure sensors, leading to inaccurate puff detection.
Innovation Solution
An aerosol generating device with a deformable sensor in the air flow passage, featuring a resistor with varying resistance values based on deformation, connected to a processor that measures and detects puffs by maintaining resistance above a threshold value during a specific time interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pressure sensor is arranged in a separate chamber distinct from the air flow passage, then the sensor arrangement is simplified, but the sensor becomes vulnerable to contamination and puff detection accuracy deteriorates
Solution Approach 1:
The patent merges the sensor chamber with the air flow passage, allowing the sensor to be positioned directly in the air flow path rather than in a separate chamber. This integration eliminates the need for separate sensing chambers and ensures the sensor directly measures air flow during puffs, improving detection accuracy while simplifying the overall structure.
Solution Approach 2:
The patent introduces a diaphragm as an intermediary element between the air flow passage and the sensor. The diaphragm transmits air flow pressure changes to the sensor while protecting it from direct contamination exposure, thus maintaining both accuracy and reliability.
2Ease of manufacture
If a pressure sensor is arranged in a separate chamber, then the sensor placement is constrained, but this limitation reduces design flexibility
Solution Approach 1:
By merging the sensor chamber with the air flow passage, the patent removes the constraint of separate chamber placement. The sensor can now be positioned at various locations along the air flow path, providing greater design flexibility and adaptability for different device configurations.
3Measurement precision
If a pressure sensor is placed in the air flow passage, then puff detection accuracy improves, but the sensor becomes exposed to contamination
Solution Approach 1:
The patent introduces a diaphragm as an intermediary element between the air flow passage and the sensor. The diaphragm transmits air flow pressure changes to the sensor while protecting it from direct contamination exposure, thus maintaining both accuracy and reliability.
Solution Approach 2:
The patent employs a diaphragm (a flexible thin film) to isolate the sensor from the air flow passage environment. The diaphragm allows mechanical transmission of pressure changes while forming a protective barrier against contamination, solving the contradiction between exposure and protection.
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 enables high-sensitivity puff detection with a flexible sensor arrangement, reducing contamination risks and improving accuracy, allowing for a more flexible internal design.
Implementation Method 1
a sensor deformable by an air flow in the air flow passage, and including a resistor having a resistance value that varies according to a degree of deformation of the sensor
Implementation Method 2
a sensor deformable by an air flow in the air flow passage, and including a resistor having a resistance value that varies according to a degree of deformation of the sensor
Data Source
AI summary
Disclosed is an aerosol generating device including: a housing including an air flow passage; a sensor deformable by an air flow in the air flow passage, and including a resistor having a resistance value that varies according to a degree of deformation of the sensor; and a processor electrically connected to the sensor, and configured to: measure the resistance value of the resistor; and detect a puff based on the measured resistance value being maintained at or above a first threshold value during a first time interval.