Aerosol Sensing Unit for Electronic Smoking Device
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Solution Overview
Problem
Existing electronic smoking devices lack an efficient method to monitor aerosol generation in real-time, making it difficult to control aerosol output and estimate remaining e-liquid in cartridges, which can lead to unnecessary liquid consumption and device shutdown.
Innovation Solution
An aerosol sensing unit integrated with a light intensity detecting system using LEDs and photodiodes, along with a pressure sensor, measures aerosol density and flow speed to calculate the volume of aerosol generated during each puff, eliminating the need for a separate liquid level detection device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If no aerosol measurement system is used, then the device structure remains simple, but the ability to monitor aerosol generation and estimate remaining e-liquid is lost
Solution Approach 1:
The patent combines the aerosol sensing unit with the existing atomizer assembly, integrating the light emitting element, light detecting element, and pressure sensor into the same structural unit that already contains the heating element and e-liquid delivery system. This merging approach enables aerosol measurement functionality without adding a completely separate detection system, thus improving measurement capability while limiting the increase in overall device complexity.
Solution Approach 2:
The aerosol sensing unit is designed to perform multiple functions: it measures aerosol generation in real-time, estimates remaining e-liquid levels, and provides data for device control. By making the sensing unit multi-functional, the patent reduces the need for separate detection systems for each function, thereby improving measurement capabilities while keeping device complexity manageable.
2Measurement precision
If a separate liquid level detection device is added, then remaining e-liquid estimation is improved, but device complexity increases
Solution Approach 1:
The patent integrates the liquid level detection capability into the aerosol sensing unit by using the same light emitting and light detecting elements. The system estimates remaining e-liquid based on aerosol measurement data rather than direct liquid level sensing, merging two detection functions into one unit and eliminating the need for a separate liquid level detection device.
Solution Approach 2:
The patent uses aerosol measurement as an intermediary to estimate liquid level. Instead of directly measuring liquid level with a separate sensor, the system measures aerosol properties (light scattering, pressure changes) that correlate with remaining e-liquid amounts, providing indirect but effective liquid level estimation without additional detection hardware.
3Productivity
If real-time aerosol measurement is implemented, then aerosol output control is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent implements a feedback control system where the aerosol sensing unit continuously monitors aerosol generation and provides real-time data to the control unit. The control unit adjusts heating power or atomization parameters based on this feedback to maintain desired aerosol output levels, enabling precise aerosol output control through closed-loop feedback rather than open-loop control.
Solution Approach 2:
The aerosol sensing unit automatically continues measurements throughout device operation without requiring manual intervention. The system self-regulates by continuously monitoring aerosol properties and adjusting parameters as needed, reducing the need for complex manual control mechanisms while maintaining productive aerosol generation.
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
Enables accurate estimation of e-liquid consumption and remaining e-liquid in cartridges, allowing for controlled device operation and reducing the need for additional liquid level detection, thereby optimizing e-liquid usage and device functionality.
Implementation Method 1
A light emitting element, such as a light emitting diode (LED), and a light detecting element, such as a photodiode, are attached to the side wall of the chamber... derive a density of the aerosol based on an intensity of the light reflected by the aerosol
Implementation Method 2
A pressure sensor is provided inside the aerosol sensing unit to provide a real time pressure value for deriving a density and/or flow speed of the aerosol
Implementation Method 3
A heating element is disposed within a body of the aerosol sensing unit for vaporizing e-liquid conveyed by a wicking material
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 2C~3
AI summary
An electronic smoking device and a method for sensing an aerosol during a puff action to the electronic smoking device, the electronic smoking device has an aerosol sensing unit (100) containing a light intensity detector (11, 12) to detect light reflected by an aerosol moving though the aerosol sensing unit (100). A flow speed of the aerosol is derived based on the light intensity detected and a pressure condition within the aerosol sensing unit (100) detected by a pressure sensor.