Inductive Sensor for Aerosol Device Insertion Detection
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Solution Overview
Problem
Aerosol-generating devices require a method to prevent unintended heating operations when an aerosol-generating article is not inserted, necessitating accurate detection of article insertion to ensure safe and efficient operation.
Innovation Solution
Incorporating an inductive sensor to detect changes in inductance, an induction coil to generate a time-varying magnetic field, and a controller to determine article insertion, start heating, and adjust based on frequency response measurements of a coupling circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an inductive sensor is used to detect article insertion, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical detection methods with an inductive sensor that uses electromagnetic fields to detect the presence of the aerosol-generating article. The induction coil generates a magnetic field that interacts with the metallic components of the article, causing detectable changes in inductance, providing non-contact and more accurate detection without requiring mechanical switches or physical contacts.
Solution Approach 2:
The system detects article insertion by monitoring changes in electrical parameters (inductance) of the induction coil. When the article is inserted, it alters the magnetic field characteristics, causing measurable changes in the coil's inductance value. The controller analyzes these parameter changes to determine insertion status, enabling precise detection through electrical parameter monitoring.
2Reliability
If a secondary frequency response measurement is implemented, then safety is improved, but operation time increases
Solution Approach 1:
The system performs a preliminary detection using the inductive sensor to quickly determine if an article is inserted. Based on this initial assessment, it conditionally performs a secondary frequency response measurement only when needed. This staged approach ensures safety through multiple verification steps while minimizing unnecessary delays by skipping the second measurement when the first detection is sufficient.
Solution Approach 2:
The controller uses feedback from the inductive sensor detection to decide whether to initiate the secondary frequency response measurement. The system continuously monitors the initial detection result and adjusts its operation accordingly - performing additional verification measurements only when the initial detection indicates potential insertion, thereby balancing safety verification with operational efficiency.
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 effectively prevents unintended heating by accurately detecting aerosol-generating article insertion and type, ensuring safe operation and increased reactivity of the device.
Implementation Method 1
an induction coil configured to generate a time-varying magnetic field by a current
Implementation Method 2
a susceptor configured to heat an aerosol-generating article inserted into an accommodation space of the aerosol-generating device according to the time-varying magnetic field
Implementation Method 3
an inductive sensor that detects a change in inductance
Data Source
AI summary
According to some embodiments, an aerosol-generating device includes: an inductive sensor that detects a change in inductance; an induction coil configured to generate a time-varying magnetic field by a current; a susceptor configured to heat an aerosol-generating article inserted into an accommodation space of the aerosol-generating device according to the time-varying magnetic field; a controller configured to: determine whether the aerosol-generating article is inserted into the accommodation space based on the change in inductance detected by the inductive sensor, start heating the susceptor by applying the current to the induction coil based on determining that the aerosol-generating article is inserted into the accommodation space, measure a frequency response of a coupling circuit formed in response to the current being applied to the induction coil, and determine whether to continue to heat the susceptor based on the measured frequency response.