Aerosol Heater Sensor Verification via Impedance Correlation
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Solution Overview
Problem
Aerosol-generating devices face issues with temperature sensor detachment or malfunction, leading to inaccurate temperature readings, which can result in overheating and premature power depletion due to incorrect power control based on erroneous sensor data.
Innovation Solution
The device measures the impedance of the heater element and correlates it with the temperature sensed by the temperature sensor, allowing for real-time correction of power supply to maintain target temperatures and detect potential faults in sensor operation or positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the temperature sensor is coupled to the heater element by adhesive or similar means, then the device structure is simple and easy to manufacture, but the temperature sensor may detach from the heater element resulting in inaccurate temperature readings
Solution Approach 1:
The control electronics continuously monitor the temperature sensor readings and compare them with expected temperature profiles during heating cycles. When discrepancies indicate sensor detachment or malfunction, the system provides feedback to adjust power supply or alert the user, ensuring reliable operation despite the simple adhesive coupling method
Solution Approach 2:
The temperature sensor and heater element form a self-verifying system where the sensor monitors its own coupling status to the heater. The system automatically detects detachment through temperature gradient analysis and adjusts operation accordingly, eliminating the need for complex mechanical fastening while maintaining reliability
2Ease of operation
If the control methodology assumes the temperature sensor is accurately sensing the temperature of the heater element, then the control system is simple to operate, but the heater element may overheat and deplete power prematurely due to erroneous sensor readings
Solution Approach 1:
The control electronics implement continuous feedback verification by comparing sensor readings against theoretical temperature profiles and heater impedance characteristics. When deviations exceed thresholds indicating sensor failure, the system automatically adjusts power supply to prevent overheating while maintaining simple operation for users
Solution Approach 2:
The system performs preliminary verification of temperature sensor functionality before full heating operations begin. By pre-checking sensor accuracy against known heater characteristics, the system ensures reliable operation throughout the heating session without requiring complex user intervention or operation changes
3Temperature
If the temperature sensor detects lower than actual temperature due to detachment, then the control system responds by increasing power supply to reach target temperature, but this results in heater element overheating and rapid power depletion
Solution Approach 1:
The control electronics use feedback from both temperature sensor readings and heater impedance measurements to verify temperature accuracy. When sensor detachment is detected through impedance-temperature correlation, the system compensates by reducing power supply adjustments, preventing both overheating and unnecessary power depletion
Solution Approach 2:
The system changes operational parameters dynamically by adjusting power supply based on verified temperature accuracy. When sensor reliability is confirmed through impedance correlation, normal temperature-based power control applies; when detachment is detected, the system switches to impedance-based or reduced power control to optimize energy consumption and prevent damage
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
This approach ensures accurate tracking of target temperatures, prevents overheating, and prolongs the device's power source life by correcting power supply based on impedance discrepancies, thereby enhancing operational reliability and efficiency.
Implementation Method 1
Aerosol-generating devices which generate an aerosol by heating rather than burning an aerosol-forming substrate are known. Such aerosol-generating devices employ an electrically-powered heater element
Implementation Method 2
a temperature sensor which may be coupled to the heater element by adhesive or similar means of coupling
Data Source
AI summary
An aerosol-generating device for generating an aerosol from an aerosol-forming substrate is provided, the aerosol-generating device including: an electrically powered heater element configured to heat the aerosol-forming substrate; a temperature sensor coupled to the electrically powered heater element and configured to sense a temperature of the electrically powered heater element; a power source configured to supply power to the electrically powered heater element and the temperature sensor; and control electronics configured to measure an impedance value of the electrically powered heater element, correlate the measured impedance value with a value of impedance determined from the temperature of the electrically powered heater element as sensed by the temperature sensor, and control the supply of power to the electrically powered heater element based on the correlation. A method of controlling an electrically powered heater element of the aerosol-generating device is also provided.