Aerosol Heater Temperature Multicalibration for Sensor Offset
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Solution Overview
Problem
Existing 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 polynomial equation for multicalibration of temperature values measured by a temperature sensor, dividing the calibration process into sections based on the size or temporal length of the calibration value, and using a controller to refine the temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the temperature sensor is not directly coupled to the heater, then the device structure is simpler and cost is reduced, but the temperature measurement accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating calibration values through polynomial equations before actual temperature measurement. The controller stores multiple calibration values corresponding to different temperature ranges, and selects the appropriate calibration value before measuring temperature to compensate for the sensor's positional deviation. This allows the system to maintain simple structure while achieving accurate temperature measurement through pre-computed compensation.
Solution Approach 2:
The patent changes the parameter of temperature measurement by introducing calibration values that adjust the raw sensor readings. Different calibration values are applied depending on the temperature range (first calibration value for lower temperatures, second calibration value for higher temperatures). This parameter adjustment compensates for the measurement error caused by the sensor not being directly coupled to the heater, thereby improving measurement accuracy without complicating the device structure.
2Measurement precision
If multiple calibration values are applied, then temperature measurement accuracy is improved, but the control process complexity increases
Solution Approach 1:
The patent segments the temperature measurement process into distinct ranges, each with its own calibration value. The temperature range is divided into at least two sections: a first temperature range using a first calibration value, and a second temperature range using a second calibration value. This segmentation allows the system to apply simpler, dedicated calibration logic for each range rather than using a single complex calibration algorithm for all temperatures, thereby managing control process complexity while maintaining high measurement accuracy.
Solution Approach 2:
The patent applies partial calibration action by using different calibration values for different temperature ranges rather than applying a single comprehensive calibration throughout. The system applies the first calibration value only when temperature is below a threshold, and the second calibration value when temperature exceeds the threshold. This partial application of calibration strategies simplifies the control logic compared to using a single complex calibration model for all conditions, while still achieving high measurement accuracy in each specific range.
Data Source
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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.