Hot-Wire Anemometer Dual-PID Control for Stable Puff Detection
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Solution Overview
Problem
Non-nicotine electronic vaping devices face challenges in efficiently controlling the heating process and ambient temperature, leading to inconsistent vapor production and user experience.
Innovation Solution
A method and device configuration utilizing a first PID controller to manage power to a hot wire anemometer based on temperature setpoints and a second PID controller to adjust temperature setpoints in response to ambient temperature changes, along with a puff detection system to optimize airflow and vapor production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single PID controller is used to control heating power, then the control system is simple, but the vapor production consistency deteriorates under varying ambient temperature conditions
Solution Approach 1:
The control system is segmented into two independent PID controllers: a first PID controller that manages heating power based on temperature feedback, and a second PID controller that adjusts the temperature setpoint based on ambient temperature detection. This segmentation allows each controller to operate independently with its own feedback loop, resolving the contradiction by maintaining system simplicity while improving vapor production consistency through adaptive temperature control.
Solution Approach 2:
The temperature setpoint is made dynamic through the second PID controller, which continuously adjusts it based on detected ambient temperature changes. This dynamic adaptation allows the heating system to maintain optimal performance across varying environmental conditions, improving vapor production consistency without requiring a completely complex control architecture.
2Device complexity
If the temperature setpoint is fixed, then the control system is simple, but the adaptability to ambient temperature changes deteriorates
Solution Approach 1:
A feedback mechanism is introduced through the second PID controller, which continuously monitors ambient temperature and adjusts the temperature setpoint accordingly. This feedback loop enables the system to adapt to ambient temperature changes automatically, improving versatility while maintaining relatively simple control logic through standard PID control algorithms.
Solution Approach 2:
The second PID controller performs preliminary adjustment of the temperature setpoint before the heating process begins, based on detected ambient temperature conditions. This preliminary action ensures the system starts from an optimized setpoint, improving adaptability without requiring complex real-time adjustments during operation.
3Temperature
If power is continuously applied to maintain temperature, then temperature stability is improved, but energy consumption increases
Solution Approach 1:
The first PID controller implements periodic adjustment of heating power based on temperature feedback, applying power only when and when the temperature deviates from the setpoint. This periodic control action maintains temperature stability while avoiding continuous power application, thereby reducing energy consumption through efficient on-demand heating cycles.
Solution Approach 2:
The system dynamically changes the temperature setpoint parameter based on ambient temperature conditions through the second PID controller. By adjusting the target temperature rather than maintaining a fixed high power level, the system achieves temperature stability adapted to environmental conditions, reducing energy consumption in cooler ambient conditions while maintaining performance.
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 configuration enhances the control over the heating process, improving vapor consistency and user experience by dynamically adjusting power and temperature settings in response to ambient conditions and puff detection.
Implementation Method 1
a hot wire anemometer (HWA) configured to detect a rate of change in airflow
Implementation Method 2
a first PID controller configured to control a level of power applied by the non-nicotine e-vaping device to the HWA based on a temperature of a heated element of the HWA and a temperature setpoint
Data Source
AI summary
A method of controlling a hot wire anemometer (HWA) of a non-nicotine e-vaping device includes controlling, by a first PID controller, a level of power applied by the non-nicotine e-vaping device to the HWA based on a temperature of a heated element of the HWA and a temperature setpoint; generating a puff detection signal indicating whether or not a puff is currently occurring with respect to the non-nicotine e-vaping device; and while the puff detection signal indicates that a puff is not currently occurring with respect to the non-nicotine e-vaping device, detecting, by a second PID controller, a change in an ambient temperature of the HWA, and controlling, by the second PID controller, the temperature setpoint such that the temperature setpoint changes in response to the detected change in the ambient temperature of the HWA.