Electrode Liquid-Level Sensing for Orientation-Stable Aerosol Pods
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Solution Overview
Problem
Existing electrically operated aerosol-generating systems lack accurate methods to determine the amount of liquid aerosol-forming substrate held in the liquid storage portion, which can affect the reliability and efficiency of aerosol generation.
Innovation Solution
An aerosol-generating system with a pair of electrodes adjacent to or in the liquid storage portion, a sensor to sense orientation, and a control system to measure electrical quantities and determine the amount of liquid aerosol-forming substrate based on these measurements and orientation information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods (visual inspection, weight sensing) are used to estimate liquid substrate amount, then the device complexity is low, but the measurement precision is insufficient
Solution Approach 1:
The patent replaces mechanical sensing methods (weight sensing, visual inspection) with an electrical field-based measurement system. A pair of electrodes generates an electrical field that interacts with the liquid substrate to produce measurable signals, enabling non-contact, high-precision measurement of liquid amount without mechanical contact or complex mechanical structures.
Solution Approach 2:
The patent introduces an electrical field as an intermediary between the measurement system and the liquid substrate. The electrical field interacts with the liquid to produce measurable signals (current, voltage, impedance) that indirectly indicate the liquid amount, allowing precise measurement without direct mechanical contact.
2Reliability
If the aerosol-generating system operates without accurate liquid amount monitoring, then the device complexity is low, but the reliability of aerosol generation is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the electrical field measurement system continuously monitors the liquid substrate amount and provides this information to the control system. The control system uses this feedback to adjust operation parameters, ensuring reliable aerosol generation by preventing operation when liquid levels are insufficient.
Solution Approach 2:
The patent performs preliminary measurement of the liquid substrate amount using the electrical field method before initiating aerosol generation. This preliminary action allows the control system to determine whether sufficient liquid is available and to optimize operation parameters in advance, ensuring reliable aerosol generation from the start.
3Measurement precision
If electrodes are placed inside the liquid storage portion, then the measurement precision is improved, but the ease of operation is reduced due to orientation sensitivity
Solution Approach 1:
The patent makes the measurement system dynamic by adjusting the electrical field configuration based on the liquid storage portion's orientation. The control system receives orientation information and dynamically modifies the electrical field parameters or electrode configuration to maintain accurate measurements regardless of orientation, allowing the device to be operated in any position.
Solution Approach 2:
The patent changes the electrical field parameters (such as frequency, voltage, or electrode configuration) based on the orientation of the liquid storage portion. By adjusting these parameters dynamically, the system maintains measurement precision across different orientations while simplifying operation for the user.
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
Improves the accuracy and reliability of estimating the amount of liquid aerosol-forming substrate, ensuring optimal aerosol generation and prolonging the life of the aerosol-generating means by controlling operation based on orientation and stability conditions.
Implementation Method 1
measure a capacitance between the pair of electrodes
Implementation Method 2
the sensor is an inertial measurement sensor configured to sense the orientation of the liquid storage portion
Data Source
AI summary
An aerosol-generating system includes a liquid storage portion for holding a liquid aerosol-forming substrate; a pair of electrodes arranged adjacent to or in the liquid storage portion; a sensor configured to sense an orientation of the liquid storage portion; and a control system configured to, measure an electrical quantity between the pair of electrodes, receive orientation information from the sensor, and determine an amount of liquid aerosol-forming substrate held in the liquid storage portion based on electrical quantity information measured between the pair of electrodes and the orientation information received from the sensor, wherein the liquid storage portion has a length and the pair of electrodes extend substantially the length of the liquid storage portion.