Aerosol Heater Control Method Preventing Temperature Overshoot

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Solution Overview

Problem

Aerosol generators face issues with heater overshoot, leading to damage and an unpleasant user experience due to rapid temperature increases, and existing PID control methods result in slow pre-heating speeds.

Innovation Solution

Implementing a method where the electric power supplied to the heater is controlled using a first method until the heater reaches an upper limit of a pre-heating temperature section, then switched to a second method, such as PID control, to maintain or exceed the target temperature, preventing overshoot while ensuring faster pre-heating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If high electric power is supplied to the heater in a short time period to ensure fast pre-heating speed, then the pre-heating speed is improved, but the heater temperature rapidly rises causing overshoot effect

Engineering Contradiction:

Improvepre-heating speedVSAvoidheater temperature overshoot

Core Design Contradiction:

SpeedVSTemperature

Solution Approach 1:

The temperature control process is segmented into two distinct stages: a first control method is applied when the heater temperature is below the upper limit of the pre-heating temperature section, and a second control method is applied when the temperature reaches or exceeds this upper limit. This segmentation allows the system to achieve fast pre-heating speed initially while preventing temperature overshoot through the transition to the second control method.

Inventive Principle:

Principle #1Segmentation

2Temperature

If PID control method is used to increase heater temperature, then overshoot effect is prevented, but pre-heating speed becomes very slow

Engineering Contradiction:

Improveheater temperature control stabilityVSAvoidpre-heating speed

Core Design Contradiction:

TemperatureVSSpeed

Solution Approach 1:

The control method dynamically transitions from a first control method to a second control method based on the heater temperature reaching the upper limit of the pre-heating temperature section. This dynamic adjustment allows the system to optimize between heating speed and temperature stability, achieving both fast pre-heating and overshoot prevention.

Inventive Principle:

Principle #15Dynamics

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 approach prevents heater overshoot and achieves a faster pre-heating speed compared to traditional PID control, providing a better user experience by maintaining the target temperature effectively.

Implementation Method 1

a heater for generating aerosol by heating an aerosol generating material

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

heating an aerosol generating material in cigarettes

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS11589622B2Method for preventing overshoot of heater in aerosol generation apparatus, and aerosol generation apparatus for implementing method

Publication Date: 2023.02.28 KT&G CO LTD

AI summary

A method of controlling electric power supplied to a heater includes controlling the electric power supplied to the heater by a first method until a temperature of the heater reaches an upper limit of a pre-heating temperature section; and controlling the electric power supplied to the heater by a second method to a target temperature that is higher than the upper limit, when the temperature of the heater reaches the upper limit.