Dual-PID Hot Wire Anemometer Control for Puff and Ambient Sensing
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Solution Overview
Problem
Existing non-nicotine electronic vaping devices lack effective control mechanisms for hot wire anemometers (HWAs) to manage power levels, puff detection, and ambient temperature changes, leading to inefficiencies in vapor production and airflow measurement.
Innovation Solution
Implementing a first PID controller to regulate power to the HWA based on temperature setpoints and a second PID controller to adjust temperature setpoints in response to ambient temperature changes, with puff detection signals and PWM drive signals to manage airflow and temperature, enhancing control over vapor production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single control mechanism is used for the hot wire anemometer, then the device structure remains simple, but the precision of vapor production and airflow measurement deteriorates
Solution Approach 1:
The control mechanism is divided into two separate PID controllers: a first PID controller that manages power levels to the hot wire anemometer for airflow measurement, and a second PID controller that adjusts temperature setpoints in response to ambient temperature changes. This segmentation allows each controller to specialize in specific control functions, thereby improving measurement precision without requiring a single overly complex control system.
Solution Approach 2:
The patent introduces intermediate control elements including puff detection signals that trigger control mode transitions, and PWM drive signals that mediate between the first PID controller's power level commands and the actual power delivery to the hot wire anemometer. These intermediaries enable precise control while maintaining system modularity.
2Productivity
If dynamic power adjustment is implemented, then vapor production efficiency improves, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts the power level to the hot wire anemometer based on real-time airflow detection requirements. The first PID controller continuously modulates power delivery according to the temperature differential between the hot wire and ambient air, enabling the system to optimize vapor production efficiency by adapting power consumption to actual operational needs rather than maintaining constant high power.
Solution Approach 2:
The patent implements feedback control through the first PID controller that monitors the temperature of the heated element and the temperature setpoint, continuously adjusting power delivery based on the differential between these parameters. This feedback mechanism ensures energy is consumed only to the extent necessary to maintain accurate airflow measurements and efficient vapor production.
3Adaptability or versatility
If temperature setpoint is fixed, then control simplicity is maintained, but adaptability to ambient temperature changes deteriorates
Solution Approach 1:
The second PID controller performs preliminary action by proactively adjusting the temperature setpoint in response to detected ambient temperature changes before these changes significantly impact vapor production. This anticipatory adjustment ensures the system remains adaptable to environmental conditions without requiring complex real-time corrections during operation.
Solution Approach 2:
The patent changes the temperature setpoint parameter dynamically based on ambient temperature conditions. The second PID controller monitors ambient temperature and adjusts the setpoint accordingly, allowing the system to adapt to different environmental conditions. This parameter change approach maintains control simplicity by modifying only the setpoint value rather than restructuring the entire control system.
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
Improves the precision of vapor production and airflow measurement by dynamically adjusting power and temperature settings, resulting in more efficient and responsive non-nicotine vapor generation.
Implementation Method 1
detecting, by a second PID controller, a change in an ambient temperature of the HWA
Implementation Method 2
detecting a change in an ambient temperature of the HWA
Implementation Method 3
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
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.