Aerosol-Generating Device with Dual-Sensor Article Detection
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Solution Overview
Problem
Conventional aerosol-generating devices rely solely on inductance changes to detect cigarette insertion, which can lead to false detection of external ferromagnetic materials, causing unintended heating operations and potential accidents.
Innovation Solution
An aerosol-generating device that combines inductance and capacitance sensors to detect cigarette insertion, using a marker with both permeability and permittivity to accurately differentiate between a cigarette and external ferromagnetic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only inductance change is used for cigarette detection, then the detection method is simple, but false detection of external ferromagnetic materials occurs
Solution Approach 1:
The patent combines inductance sensing and capacitance sensing into a unified detection system. The controller simultaneously monitors both inductance changes (via coil L1) and capacitance changes (via capacitor C1) to determine cigarette insertion. This merging of two different sensing modalities resolves the contradiction by maintaining relative simplicity while significantly improving detection reliability through cross-validation of signals.
Solution Approach 2:
The patent introduces a dual-sensing intermediary system that acts as a mediator between the cigarette and the heating element. Instead of directly relying on a single physical property change, the system uses both inductance and capacitance as intermediate measurement parameters. This intermediary approach allows the system to distinguish true cigarette insertion from false ferromagnetic signals by requiring consistent changes in both parameters.
2Device complexity
If inductance-only detection is used, then the device structure is simple, but false activation and safety issues occur
Solution Approach 1:
The patent merges inductance sensing (coil L1) and capacitance sensing (capacitor C1) into a combined detection system. The controller requires both inductance and capacitance changes to confirm cigarette insertion before activating heating. This merging approach maintains relatively simple device structure while eliminating false activation risks by implementing a dual-validation safety mechanism.
Solution Approach 2:
The patent implements beforehand cushioning by preparing a dual-sensing detection system that anticipates and prevents false activation. The capacitance sensor acts as a preliminary safety check before the inductance signal triggers heating. This prior cushioning measure ensures that even if one sensor produces a false signal, the second sensor will prevent inappropriate heating activation.
3Measurement precision
If dual sensing (inductance and capacitance) is implemented, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The patent merges inductance and capacitance sensing functions into an integrated detection system with a unified controller. Rather than implementing two separate independent detection systems, the controller simultaneously processes both sensor signals using a single decision-making algorithm. This merging strategy achieves high measurement precision while controlling device complexity through functional integration.
Solution Approach 2:
The controller is designed with multi-functionality, serving both as the inductance signal processor and the capacitance signal processor. A single controller component performs multiple detection and control functions, including monitoring L1 coil inductance, monitoring C1 capacitor capacitance, comparing both signals against reference values, and controlling the heating element. This universality reduces overall device complexity despite the enhanced dual-sensing capability.
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 detection accuracy by utilizing a combination of inductance and capacitance changes to confirm cigarette presence, preventing false activations and enhancing safety.
Implementation Method 1
an inductance sensor configured to measure an inductance value of a coil
Implementation Method 2
a capacitance sensor configured to measure a capacitance value of a capacitor
Data Source
AI summary
An aerosol-generating device and a controlling method thereof are provided. The aerosol-generating device may include a heating chamber configured to receive an aerosol-generating article, a heater configured to heat the aerosol-generating article in the heating chamber, an inductance sensor configured to measure an inductance value of a coil, a capacitance sensor configured to measure a capacitance value of a capacitor, and a controller configured to detect whether the aerosol-generating article is inserted based on the inductance value of the coil and the capacitance value of the capacitor.