Aerosol Generator PID Control Using Temperature-Pressure Feedback
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Solution Overview
Problem
Aerosol provision systems, such as e-cigarettes and heat-not-burn products, face challenges in maintaining optimal temperature control, leading to carbonization and the formation of unwanted chemicals and flavors due to overheating, which reduces the device's lifespan and consistency in flavor delivery.
Innovation Solution
Implementing a closed-loop control system that monitors temperature and pressure using sensors and processing circuitry to adjust power to the aerosol generator, employing a PID algorithm to manage the duty cycle of the power supply, ensuring precise temperature management and reducing overheating.
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 control becomes difficult leading to carbonization and unwanted chemicals
Solution Approach 1:
The patent implements a closed-loop control system using temperature sensors to continuously monitor the aerosol generator temperature and adjust power delivery accordingly. The processing circuitry receives temperature feedback and modulates the power signal to maintain temperature within a safe operating range, preventing carbonization while preserving aerosol delivery performance.
Solution Approach 2:
The system dynamically adjusts the power delivery to the aerosol generator based on real-time temperature conditions and usage patterns. The duty cycle of the power signal is continuously modified to match actual operating conditions, allowing high power when needed for aerosol generation while reducing power when temperature approaches dangerous levels.
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 sensors provide continuous feedback to the processing circuitry, which automatically adjusts power delivery to prevent overheating. This closed-loop control extends the aerosol generator lifespan by maintaining safe operating temperatures without requiring complex manual intervention or oversimplified designs.
Solution Approach 2:
The control system autonomously monitors and regulates its own operating temperature through integrated sensors and processing circuitry. The system self-adjusts power delivery based on real-time conditions, eliminating the need for external temperature management and preventing thermal damage that would reduce component lifespan.
3Stability of the object's composition
If the power to aerosol generator is continuously adjusted based on real-time usage, then the flavor delivery consistency is improved, but the device complexity increases due to closed-loop control requirements
Solution Approach 1:
The processing circuitry uses temperature feedback from sensors to dynamically adjust power delivery, ensuring consistent aerosol generation and flavor delivery. The closed-loop control maintains optimal operating conditions throughout the consumable's usage life, preventing degradation in flavor quality while using integrated components to minimize overall system complexity.
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, maintains consistent flavor delivery, and reduces the formation of unwanted chemicals by optimizing temperature control based on real-time usage, enhancing consumer experience.
Implementation Method 1
a temperature sensor configured to produce measurements of temperature of one or both of the aerosol generator or the aerosol-generating material
Implementation Method 2
a pressure sensor configured to produce measurements of pressure caused by airflow through the housing
Implementation Method 3
an aerosol generator powered by a power source to generate an aerosol from the aerosol-generating material
Data Source
AI summary
An aerosol provision device includes a housing; a consumable including aerosol-generating material. The aerosol provision device or the consumable includes an aerosol generator to generate an aerosol from the aerosol-generating material. The device includes a pressure sensor, a temperature sensor, and 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. The processing circuitry is configured to implement a proportional-integral-derivative (PID) algorithm to adjust the duty cycle based on the processing circuitry determining whether the measurements of temperature or the measurements of pressure take precedence for implementing the PID algorithm to adjust the duty cycle.