Aerosol Control via Dynamic Power Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrically-operated aerosol-generating devices face challenges in maintaining consistent aerosol properties due to uncontrolled heating processes during puffing, leading to variations in aerosol droplet size and mixing efficiency caused by changing flow rates and temperatures.
Innovation Solution
The method involves controlling the power provided to the heating element to maintain constant physical and chemical characteristics of the aerosol, such as droplet size and mixing efficiency, by monitoring parameters like gas flow rate, temperature, and vaporization rate in real-time, and adjusting the heating profile accordingly to achieve a quasi-steady cooling rate and mixing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power controlled heating is used to maintain constant power delivery, then energy efficiency is improved, but aerosol properties vary due to temperature changes with increasing flow rate
Solution Approach 1:
The system dynamically changes the heating power parameter based on detected aerosol properties (temperature, flow rate, composition) to maintain optimal aerosol characteristics. The controller adjusts power delivery in response to real-time feedback, transforming the static power-controlled approach into a dynamic adaptive system that balances energy efficiency with aerosol consistency.
Solution Approach 2:
The system implements a feedback loop where sensors continuously monitor aerosol temperature, flow rate, and composition, and the controller uses this information to adjust heating power. This closed-loop control ensures that aerosol properties remain stable while optimizing energy consumption based on actual operating conditions.
2Stability of the object's composition
If temperature controlled heating is used to maintain constant temperature, then aerosol properties are improved, but power consumption increases due to compensation for convection-diffusion energy loss
Solution Approach 1:
Instead of maintaining constant high power to compensate for all potential energy losses, the system applies heating power dynamically based on actual needs. The controller delivers partial heating action when flow rates are low and energy loss is minimal, reducing overall power consumption while still maintaining adequate aerosol properties.
Solution Approach 2:
The system changes the temperature setpoint or heating power parameter based on detected flow rate and aerosol composition, transitioning from a fixed temperature control approach to a variable parameter approach that reduces power consumption while maintaining aerosol quality.
3Device complexity
If uncontrolled heating process is used during puff duration, then device complexity is reduced, but aerosol droplet size and mixing efficiency vary
Solution Approach 1:
The system uses the aerosol generation process itself to provide feedback information (temperature, flow rate, composition measurements) that automatically controls the heating process. This self-regulating mechanism maintains consistent aerosol droplet size without requiring complex external control systems, achieving precision through the system's own operational parameters.
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 ensures the production of a consistent aerosol with stable characteristics, such as droplet size and concentration, over the duration of gas flow, enhancing the device's ability to produce a homogeneous mixture and extending battery life by minimizing power consumption fluctuations.
Implementation Method 1
providing power to the heating element such that the aerosol-forming substrate is heated and volatile components of the aerosol-forming substrate are entrained in the gas flow
Implementation Method 2
allowing the entrained gas flow to cool such that the volatile components condense and form an aerosol
Implementation Method 3
a heating element... such that the aerosol-forming substrate is heated
Implementation Method 4
air flows through the device... air flow over the heating element will result in increased power being supplied
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A method of controlling aerosol production in an aerosol-generating device (100) having a heater (119), an aerosol-forming substrate (113), and a power source comprises the steps of providing a period of gas flow over the aerosol-forming substrate, the gas flow rate varying during the period of gas flow, providing power to the heater such that the aerosol-forming substrate is heated and volatile components of the aerosol-forming substrate are entrained in the gas flow, and allowing the gas flow to cool such that the volatile components condense and form an aerosol. The power provided to the heater during the period of gas flow is controlled such that one or more physical and/or chemical characteristics of the aerosol are maintained at a substantially constant value during the period of gas flow. Thus, the aerosol that is generated has substantially uniform properties over the entire duration of the puff.