Heater Temperature Measurement Using Lookup Table
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Solution Overview
Problem
Aerosol-generating devices face computational complexity in accurately determining the temperature of their heater elements in real-time due to the complex and non-linear correlation between measured voltage and temperature, which affects the ability to maintain a target operating temperature.
Innovation Solution
The device employs a temperature sensor with resistivity-dependent temperature measurement, coupled with control electronics that use pre-configured data in the form of a look-up table to correlate measured voltage with corresponding temperature values, allowing for efficient determination of the heater element temperature and adjustment of power supply to track the target temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time accurate temperature determination is implemented using complex non-linear voltage-temperature correlation, then temperature measurement precision is improved, but device complexity and computational burden increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the complex non-linear voltage-temperature correlation data in a look-up table during the device manufacturing or initialization phase. This allows the control electronics to quickly retrieve temperature values from pre-computed data without performing complex real-time calculations, thus maintaining high measurement precision while reducing operational computational complexity
Solution Approach 2:
The patent uses copying by creating a simplified representation of the complex non-linear relationship through a look-up table that stores pre-computed voltage-temperature pairs. This copied data structure allows the system to access temperature information efficiently without reproducing the complex calculation process during operation, resolving the contradiction between precision and computational complexity
2Measurement precision
If complex non-linear correlation calculation is performed in real-time, then temperature determination accuracy is improved, but processing speed decreases
Solution Approach 1:
The patent performs the complex non-linear correlation calculations in advance during system initialization or manufacturing, storing the results in a look-up table. During operation, the system simply retrieves pre-computed values based on measured voltage, maintaining high temperature determination accuracy while achieving fast processing speeds suitable for real-time control
Solution Approach 2:
The patent implements a dynamic approach by switching between different calculation modes: using the look-up table for normal real-time operations to ensure speed, and potentially using direct correlation calculations only when necessary (such as during calibration or when voltage values fall outside the pre-computed range), thus optimizing the balance between accuracy and processing speed
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 method reduces computational burden and improves the accuracy and speed of temperature determination, enabling the heater element to closely track the target temperature, thereby enhancing user experience.
Implementation Method 1
a temperature sensor positioned in close proximity to the heater element, in which the temperature sensor has a temperature-dependent resistivity
Data Source
AI summary
An aerosol-generating device for generating an aerosol from an aerosol-forming substrate is provided, the device including: an electrically powered heater element configured to heat the aerosol-forming substrate; a temperature sensor thermally coupled to the heater element, the temperature sensor having a resistivity dependent on a temperature of the heater element; a power source configured to supply power to the heater element and the temperature sensor; and control electronics configured to measure a voltage across the temperature sensor, the voltage being dependent on a resistivity of the temperature sensor, the control electronics including or being communicably coupled to a memory storing preconfigured data, the preconfigured data including a plurality of voltage values and a corresponding plurality of temperature values, the control electronics being further configured to correlate the measured voltage with the preconfigured data and to determine a value for a heater element temperature based on the correlation.