Aerosol Heater Hybrid Control for Dry Puff and Overshoot
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Solution Overview
Problem
Aerosol-generating systems face challenges in producing consistent aerosol properties and efficiency due to variations in manufacturing, substrate properties, and operating conditions, with issues like 'dry puff' leading to overheating and undesirable by-products.
Innovation Solution
A hybrid method of temperature regulation in aerosol-generating systems, combining power regulation and resistance regulation, where a predetermined power is provided to the heater, and the resistance is monitored to determine a target resistance, allowing for controlled adaptation of power to maintain the heater at a target temperature, reducing the likelihood of overshooting and improving consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If power regulation is used to heat the heater, then the heater reaches target temperature quickly, but temperature overshoot occurs leading to inconsistent aerosol properties
Solution Approach 1:
The system continuously monitors the heater's resistance (which correlates with temperature) and uses this feedback to adjust the power delivery. When the resistance indicates the target temperature is reached, the control circuitry reduces or stops power delivery, preventing temperature overshoot and ensuring consistent aerosol properties throughout the puff.
Solution Approach 2:
The system dynamically adjusts the power delivery to the heater based on real-time resistance measurements. The control circuitry modifies the power level during the heating process, transitioning from high power for rapid heating to reduced power for temperature maintenance, thereby achieving both fast heating and temperature stability.
2Productivity
If higher power is provided to the heater, then aerosol generation efficiency increases, but energy waste increases due to temperature overshoot
Solution Approach 1:
The resistance monitoring system provides continuous feedback on the heater's temperature state, enabling the control circuitry to deliver power only when needed. This prevents energy waste from continuous high-power delivery while maintaining high aerosol generation efficiency during the critical heating and vaporization phases.
Solution Approach 2:
The system applies high power temporarily during the initial heating phase to rapidly reach target temperature, then reduces power to maintenance levels. This partial application of high power achieves efficient heating without the continuous energy waste that would result from sustained high-power operation.
3Device complexity
If temperature control is not implemented, then device complexity is reduced, but dry puff situations occur leading to overheating and thermal decomposition
Solution Approach 1:
The heater's own resistance serves as the temperature sensor, eliminating the need for separate temperature sensing components. The control circuitry uses the resistance measurement to self-regulate power delivery, preventing overheating and dry puff conditions while adding minimal complexity to the system.
Solution Approach 2:
The heater element performs multiple functions: it generates heat for vaporization and simultaneously serves as the temperature sensor through its resistance measurements. This multi-functionality reduces the need for additional components while ensuring reliable temperature control and overheating prevention.
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 enhances the consistency and efficiency of aerosol production by minimizing temperature overshoots, reducing energy waste, and preventing 'dry puff' situations, leading to a more uniform user experience and improved system performance.
Implementation Method 1
the heater typically comprises a coil of resistive heating wire which is wound around the elongate wick. When a user activates the device, an electric current passes through the heater causing resistive heating which vaporises the liquid in the wick.
Implementation Method 2
resistive heating which vaporises the liquid in the wick. By inhaling through or puffing on the mouthpiece, air is drawn through the system and entrains the vapour, which subsequently cools to form an aerosol.
Data Source
AI summary
A method of controlling heating in an aerosol-generating system including a heater is provided, the method including: a first control step in which a predetermined power is provided to the heater and a resistance of the heater is determined, the determined resistance being indicative of a temperature of the heater; monitoring for a predetermined condition, and upon detection of the predetermined condition, recording a resistance of the heater; determining a target resistance corresponding to a target temperature of the heater based on the recorded resistance; and a second control step in which the predetermined power provided to the heater is controllably adapted to drive the resistance of the heater towards the target resistance such that the heater is driven towards the target temperature corresponding to the target resistance. An aerosol-generating system and a controller for an aerosol-generating system are also provided.