Multi-Zone Aerosol Heater Control for Flat Temperature Profiles
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Solution Overview
Problem
Existing aerosol provision apparatuses for heating smokable materials lack an efficient temperature control mechanism to maintain a flat temperature gradient across heating zones, leading to uneven heating and potential hot puff phenomena.
Innovation Solution
The apparatus incorporates a heater arrangement with multiple heating zones and temperature sensors positioned strategically to maintain a flat temperature gradient, allowing for independent temperature control of each zone to ensure consistent heating of smokable materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single heating zone is used, then the device complexity is reduced, but the temperature uniformity across the heating surface deteriorates
Solution Approach 1:
The heater arrangement is divided into multiple independent heating zones (first heating zone and second heating zone), each with its own temperature sensor and control parameters. This segmentation allows independent temperature control of each zone to achieve uniform overall temperature distribution across the heating surface.
Solution Approach 2:
Different heating zones are assigned different target temperatures and control characteristics based on their local requirements. The first heating zone may use PID control while the second heating zone uses ON/OFF control, optimizing temperature uniformity in different regions of the heating surface.
2Measurement precision
If temperature sensors are positioned at the center of heating zones, then the measurement precision is improved, but the temperature gradient flatness across zones deteriorates
Solution Approach 1:
The temperature sensors are positioned asymmetrically relative to the heating zones - not at the geometric centers but at offset positions. The first temperature sensor is positioned at a first offset from the center of the first heating zone, and the second temperature sensor is positioned at a second offset from the center of the second heating zone. This asymmetric positioning is specifically designed to achieve substantially flat temperature gradients across both heating zones simultaneously.
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 solution ensures even heating of smokable materials, reducing the likelihood of hot puff and optimizing the volatilization process, resulting in a more consistent and efficient aerosol production.
Implementation Method 1
a heater arrangement for heating smokable material contained in use within the apparatus, the heater arrangement comprising at least a first heating zone and a second heating zone
Implementation Method 2
providing a temperature sensor for each of the first and second heating zones, each temperature sensor for providing temperature measurements to be used as input temperature measurements for a temperature control loop
Implementation Method 3
the control loop for controlling the heater arrangement to heat its associated respective heating zone to a target temperature based on the input temperature measurements acquired by the associated temperature sensor
Data Source
AI summary
A method of manufacturing an aerosol provision apparatus for heating smokable material to volatilize at least one component of the smokable material, and an aerosol provision apparatus, are described. The method includes providing a heater arrangement for heating smokable material contained in use within the apparatus, the heater arrangement including at least a first heating zone and a second heating zone for heating different portions of the smokable material, providing a temperature sensor for each of the first and second heating zones, each temperature sensor for providing temperature measurements to be used as input temperature measurements for a temperature control loop, the control loop for controlling the heater arrangement to heat its associated respective heating zone to a target temperature based on the input temperature measurements acquired by the associated temperature sensor, and positioning each temperature sensor in its associated heating zone at a respective position selected so that if the heating arrangement were to heat the first and second heating zones so that the temperature sensors measure the same pre-selected target temperature, a temperature gradient across the length of the heating zones between the temperature sensorswould be optimized as being substantially flat.