HNB Heater Control Using Airflow Feedback for Stable Aerosol Output
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Solution Overview
Problem
Heat-not-burn aerosol-generating devices face challenges in efficiently controlling the heater to maintain optimal temperature and airflow, leading to inconsistent aerosol production and user experience.
Innovation Solution
A system with a controller that detects airflow and applies varying powers to the heater based on preheat and draw temperatures, using a PID controller to adjust power levels and ensure consistent aerosol generation, including a memory storing computer-readable instructions to execute these control methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single power level is applied to the heater, then the device structure is simple, but the temperature control is inconsistent leading to poor aerosol production quality
Solution Approach 1:
The heater control system dynamically adjusts power levels based on real-time airflow detection. The controller switches between multiple power levels (first, second, and third power levels) depending on whether airflow is detected and the current temperature, enabling adaptive temperature control that maintains consistent aerosol production across varying user draws.
Solution Approach 2:
The system incorporates airflow sensing that provides feedback to the controller. When airflow is detected, the controller adjusts heater power accordingly - applying higher power when no airflow is present to maintain temperature, and reducing power when airflow is detected to prevent overheating and conserve energy.
2Stability of the object's composition
If the heater power is increased to maintain temperature, then the temperature stability is improved, but the energy consumption increases
Solution Approach 1:
The heater operates in periodic cycles, switching between different power levels based on airflow detection and temperature requirements. During periods without airflow, the heater applies higher power to maintain temperature. When airflow is detected, the heater reduces or stops power application, creating an energy-efficient periodic operation pattern that maintains temperature stability only when necessary.
3Measurement precision
If multiple power levels are applied to the heater, then the temperature control precision is improved, but the control system complexity increases
Solution Approach 1:
The temperature control is segmented into distinct operational phases with predefined power levels. Instead of using complex continuous control, the system divides the heating process into segments: a first power level for rapid heating, a second power level for maintenance heating, and a third power level for high-precision temperature control. This segmentation simplifies the controller logic while achieving precise temperature management.
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
The system effectively controls the heater to maintain optimal temperatures and airflow, improving the consistency and quality of aerosol production, enhancing user experience by ensuring precise power management and temperature regulation.
Implementation Method 1
heat a plant material to a temperature that is sufficient to release constituents of the plant material while keeping the temperature below a combustion point of the plant material
Implementation Method 2
detect an airflow in the non-combustible aerosol-generating device
Implementation Method 3
a proportional-integral-derivative (PID) controller, wherein the controller is configured to cause the non-combustible aerosol-generating device to change at least one of a proportional term, an integral term and a derivative term of the PID controller based on the detected airflow
Data Source
AI summary
At least one example embodiment provides s system for controlling a heater in a non-combustible aerosol-generating device. The system comprises a memory storing computer-readable instructions and a controller configured to execute the computer-readable instructions to cause the non-combustible aerosol-generating device to, detect an airflow in the non-combustible aerosol-generating device, apply a first power to the heater based on the detected airflow, apply a second power to the heater based on a target preheat temperature and the detected airflow being below an airflow threshold value, the application of the second power being after the application of the first power, and apply a third power to the heater based on the target preheat temperature and the detected airflow being below the airflow threshold value, the application of the third power being after the application of the second power, the third power being greater than the second power.