Heater Temperature Multicalibration in Aerosol Generating Devices
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Solution Overview
Problem
Aerosol generating devices face inaccuracies in temperature measurement due to the location of temperature sensors, which do not directly couple with the heater, leading to discrepancies between measured and actual heater temperatures, and the use of IR sensors is not commercially feasible.
Innovation Solution
Implementing a temperature sensor to measure heater temperature, followed by a processor that applies first and second calibration values using polynomial equations and criteria to achieve accurate temperature determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a temperature sensor is used to measure heater temperature, then temperature control can be implemented, but measurement accuracy deteriorates due to non-direct coupling with the heater
Solution Approach 1:
The patent introduces an intermediary calibration mechanism that mediates between the temperature sensor and the heater. A calibration curve is established through preliminary experiments, creating a mapping relationship between the sensor's measured temperature and the heater's actual temperature. This intermediary calibration layer resolves the contradiction by allowing temperature control to be implemented while compensating for measurement inaccuracies through the calibration relationship.
Solution Approach 2:
The patent applies parameter changes by transforming the temperature measurement through a calibration curve. Instead of using the raw sensor temperature directly, the system transforms the temperature parameter using pre-established calibration data that accounts for the non-direct coupling effects. This parameter transformation resolves the measurement accuracy issue while maintaining the temperature control functionality.
2Measurement precision
If an infrared measuring device is used to measure heater temperature, then measurement accuracy improves, but device cost increases making it commercially infeasible
Solution Approach 1:
The patent creates a simplified copy or model of the infrared measurement capability through software-based calibration. Instead of using expensive infrared hardware, the system establishes a calibration curve that replicates the temperature measurement function. This software-based copy achieves comparable measurement accuracy without the high cost of infrared measuring devices, resolving the contradiction between measurement precision and manufacturing cost.
Solution Approach 2:
The patent replaces expensive, complex infrared measuring hardware with a simple, low-cost temperature sensor combined with software calibration. The calibration data acts as a disposable lookup table that compensates for the sensor's limitations, enabling accurate temperature measurement using inexpensive components rather than costly infrared technology.
Data Source
AI summary
An aerosol generating device may include: a heater configured to apply heat to an aerosol generating substrate; a temperature sensor configured to measure a temperature of the heater to obtain a measured temperature value; and a processor configured to: control power supplied to the heater; add a first calibration value to the measured temperature value to obtain a first calibrated temperature value; add a second calibration value to the first calibrated temperature value to obtain a second calibrated temperature value; and determine the second calibrated temperature value as the temperature of the heater.