Capacitance-Based Stick Insertion Detection for Aerosol Heaters
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Solution Overview
Problem
Conventional methods for determining the state of an aerosol-generating stick in devices are inaccurate due to sensor noise and fail to account for various user insertion patterns, leading to reduced accuracy and difficulty in optimizing power supply to the heater.
Innovation Solution
An aerosol-generating device that includes a sensor to measure capacitance, a memory to store sensing values, and a controller to calculate representative values and delta values, adjusting power supply to the heater based on stick insertion patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensor threshold methods are used to determine stick state, then the device structure remains simple, but measurement precision deteriorates due to sensor noise affecting accuracy
Solution Approach 1:
The system performs preliminary actions by storing multiple sensing values over a predetermined time period before making a determination. The controller accumulates sensing values in memory, calculates representative values, and computes delta values in advance, allowing the system to filter out noise and accurately determine stick insertion/removal states without being affected by temporary sensor fluctuations.
2Adaptability or versatility
If simple threshold-based detection is used, then the device complexity remains low, but adaptability deteriorates as various user insertion patterns cannot be accommodated
Solution Approach 1:
The system applies dynamics by transitioning from static threshold comparison to dynamic analysis of sensing value changes over time. The controller continuously monitors delta values (changes in representative values) and determines stick states based on whether the sum of consecutive delta values exceeds a threshold, allowing the system to adapt to various insertion patterns including slow insertion, partial insertion, and repositioning behaviors.
3Reliability
If sensor noise is present, then the sensing values fluctuate temporarily, but the conventional threshold method cannot distinguish noise from actual state changes, reducing reliability
Solution Approach 1:
The system implements feedback by continuously monitoring sensing values, calculating representative values, and determining delta values over multiple time cycles. The controller uses the sum of consecutive delta values as feedback to confirm actual state changes, distinguishing them from temporary noise fluctuations. This multi-cycle feedback mechanism significantly improves the reliability of stick state determination.
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
Accurately determines the state of the stick insertion and optimizes power supply, enhancing the device's operational accuracy and user experience by accounting for different insertion behaviors.
Implementation Method 1
a sensor configured to output a sensing value corresponding to capacitance of the insertion space
Implementation Method 2
a heater configured to heat a stick inserted into the insertion space
Data Source
AI summary
Disclosed are an aerosol-generating device and a method of operating the same. The aerosol-generating device includes a body having an insertion space formed therein, a heater configured to heat a stick inserted into the insertion space, a sensor configured to output a sensing value corresponding to capacitance of the insertion space, a memory, and a controller, wherein the controller is configured to store the sensing value in the memory according to a predetermined cycle, to calculate a representative value of a plurality of consecutive sensing values stored in the memory, to calculate a delta value, which is the difference between two consecutive representative values, to determine whether the stick is inserted based on the sum of a predetermined number of consecutive delta values, and in response to insertion of the stick, to adjust the supply of power to the heater based on a change in the delta value.