Closed-Loop Aerosol Heating Control for Carbonization Prevention
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Solution Overview
Problem
Aerosol provision systems face challenges in maintaining optimal temperature and pressure control, leading to carbonization and the formation of unwanted chemicals and flavors due to overheating, which reduces the lifespan of the aerosol generator and affects consistent flavor delivery.
Innovation Solution
Implementing a closed-loop control system with temperature and pressure sensing, using a proportional-integral-derivative (PID) algorithm to adjust the power to the aerosol generator based on real-time measurements, ensuring precise control and reducing overheating through a modulated signal with an adjustable duty cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the aerosol generator operates at high power to deliver sufficient aerosol, then the aerosol delivery performance is improved, but the temperature rises causing carbonization and unwanted chemical formation
Solution Approach 1:
The patent implements a closed-loop feedback control system using temperature and pressure sensors to continuously monitor operating conditions. The processing circuitry adjusts the power delivery to the aerosol generator in real-time based on sensor feedback, maintaining optimal temperature and pressure levels to prevent carbonization while ensuring sufficient aerosol delivery performance.
Solution Approach 2:
The system dynamically changes operating parameters (power, temperature, pressure) during operation. The processing circuitry modulates the duty cycle of power delivery based on real-time temperature and pressure measurements, allowing the aerosol generator to operate at high power when needed while automatically reducing power when temperature or pressure thresholds are approached, thus preventing harmful effects.
2Device complexity
If the aerosol generator is operated without precise temperature control, then the device complexity is reduced, but the lifespan of the aerosol generator decreases due to overheating
Solution Approach 1:
Temperature and pressure feedback sensors continuously monitor the aerosol generator operating conditions. The processing circuitry uses this feedback to automatically adjust power delivery, preventing overheating and extending the aerosol generator lifespan without requiring complex manual control mechanisms.
Solution Approach 2:
The control system is self-regulating, using embedded temperature and pressure sensors with processing circuitry that automatically adjusts power delivery based on real-time conditions. This self-service approach prevents overheating and extends component lifespan without requiring external monitoring or complex user intervention.
3Ease of operation
If the power to the aerosol generator is not adjusted based on usage conditions, then the ease of operation is improved, but the flavor consistency deteriorates
Solution Approach 1:
Pressure sensors detect user activation and airflow conditions, providing feedback to the processing circuitry which automatically adjusts power delivery to maintain consistent flavor. This closed-loop control ensures optimal heating conditions for flavor consistency while requiring minimal user input, maintaining ease of operation.
Solution Approach 2:
The system dynamically adjusts power delivery based on real-time pressure and temperature measurements during operation. The processing circuitry modulates the duty cycle according to actual usage conditions, ensuring consistent flavor delivery across different puff intensities and durations while maintaining simple user interaction.
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 extends the lifespan of the aerosol generator, reduces unwanted chemical formation, and ensures consistent flavor delivery by maintaining optimal temperature and pressure levels, enhancing consumer experience and device performance.
Implementation Method 1
a pressure sensor configured to produce measurements of pressure caused by airflow through the housing
Implementation Method 2
a temperature sensor configured to produce measurements of temperature of one or both of the aerosol generator or the aerosol-generating material
Implementation Method 3
an aerosol generator powered by a power source under control of the circuitry to energize the aerosol-generating material to generate an aerosol
Data Source
AI summary
An aerosol provision device includes a housing; circuitry; and a coupler or a receptacle structured to engage and hold a consumable including aerosol-generating material. The aerosol provision device or the consumable includes an aerosol generator powered to energize the aerosol-generating material. The circuitry includes a pressure sensor and a temperature sensor. The circuitry also includes a high-side load switch coupled to or coupleable with the aerosol generator, and processing circuitry coupled to the high-side load switch, the pressure sensor, and the temperature sensor. The processing circuitry is configured to output a modulated signal with an adjustable duty cycle to cause the high-side load switch to connect and disconnect power to the aerosol generator based on the measurements of pressure and temperature. The processing circuitry is configured to implement a proportional-integral-derivative (PID) algorithm to adjust the duty cycle based on pressure and temperature according to a predetermined relationship.