Aerosol Heater Resistance Estimation for Sensorless Temperature Control
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Solution Overview
Problem
Existing aerosol generating devices lack accurate temperature control of heaters without temperature sensors, affecting the uniformity of aerosol generation.
Innovation Solution
An aerosol generating device with a controller that calculates and adjusts the power supply to the heater based on the difference between calculated and measured current, using a lookup table to estimate the heater's temperature, allowing for precise temperature estimation and control without a separate temperature sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no temperature sensor is used, then device complexity is reduced, but temperature control precision deteriorates
Solution Approach 1:
The patent replaces the mechanical/physical temperature sensing system with an electrical measurement system. By measuring the heater's resistance through voltage and current measurements and using the relationship between resistance and temperature, the system estimates temperature without physical temperature sensors, thus reducing device complexity while maintaining temperature control precision.
Solution Approach 2:
The patent introduces resistance as an intermediary parameter to indirectly measure temperature. Instead of directly measuring temperature with a sensor, the system measures the heater's resistance (which changes with temperature) and uses this intermediate measurement to infer the temperature, achieving accurate temperature control without direct temperature sensing.
2Device complexity
If power supply is not accurately controlled, then device complexity is reduced, but aerosol generation uniformity deteriorates
Solution Approach 1:
The patent implements a feedback control system where the measured current is compared with a reference current, and the power supply is adjusted based on the difference. This feedback mechanism ensures accurate power control to maintain uniform aerosol generation while keeping the device structure relatively simple through electronic control rather than complex mechanical systems.
Solution Approach 2:
The patent dynamically adjusts the power supply parameters (voltage, current) based on real-time measurements and control algorithms. By changing electrical parameters in response to measured values, the system achieves precise control over heating power, ensuring uniform aerosol generation without requiring complex mechanical or thermal control systems.
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
Enables precise temperature estimation and control of the heater, ensuring a uniform smoking experience by accurately adjusting power supply.
Implementation Method 1
a heater configured to heat an aerosol generating material to generate aerosol
Implementation Method 2
calculate a supply current which is to be supplied to the heater based on a predefined resistance of the heater and power supplied to the heater, measure a current flowing through the heater
Data Source
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AI summary
An aerosol generating device includes a heater configured to heat an aerosol generating material to generate aerosol; a controller configured to: calculate a current flowing through the heater based on a predefined resistance of the heater and power supplied to the heater, measure the current flowing through the heater, and control the power supplied to the heater based on a difference between the calculated current and the measured current.