Differential Pressure Sensor Aerosol Device Control
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Solution Overview
Problem
Aerosol delivery devices lack improved electronics for enhanced usability and efficient control of heating elements, particularly in ensuring activation only when a threshold differential pressure is reached, while maintaining waterproofing and preventing external interference.
Innovation Solution
Incorporating a microelectromechanical systems-based (MEMS-based) sensor to measure differential pressure and a microprocessor that operates the heating element only when the pressure exceeds a threshold, with the sensor and microprocessor potted in a waterproof material and responsive to specific frequency signals to prevent external interference, and offering selectable frequency modes for power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pressure sensor and microprocessor are added to enable controlled activation based on differential pressure, then the usability and control efficiency are improved, but the device complexity increases
Solution Approach 1:
The pressure sensor and microprocessor are integrated into a single electronic assembly that is potted together as one unit, reducing the number of separate components and simplifying installation while maintaining the sophisticated control functionality
Solution Approach 2:
The patent introduces an intermediary potted assembly that encapsulates both the sensor and microprocessor, serving as a protective intermediary structure that simplifies the overall device architecture while enabling complex control operations
2Reliability
If the sensor and microprocessor are potted in waterproof material to prevent water and vapor ingress, then the reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The sensor and microprocessor are combined into a single potted assembly, allowing both components to be sealed together in one operation rather than requiring separate sealing processes for each component, thereby improving reliability while managing manufacturing complexity
3Reliability
If frequency filtering is implemented to prevent external interference, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The microprocessor monitors the frequency of incoming signals from the sensor and applies filtering based on predetermined frequency criteria, creating a feedback control mechanism that improves signal accuracy while using software-based processing to minimize additional hardware 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 enables efficient and controlled activation of the heating element based on airflow, ensuring reliable operation, waterproofing, and power efficiency, while preventing unintended activation from external signals.
Implementation Method 1
a sensor configured to produce measurements of differential pressure between an ambient atmospheric pressure and a pressure caused by airflow through at least a portion of the aerosol delivery device, the sensor being configured to convert the measurements of differential pressure to corresponding electrical signals
Implementation Method 2
the microprocessor in the active mode being configured to control the heating element to activate and vaporize components of the aerosol precursor composition
Data Source
AI summary
An aerosol delivery device includes at least one housing, a heating element, a sensor, and a microprocessor coupled to the heating element and the sensor. The at least one housing encloses a reservoir configured to retain an aerosol precursor composition. The sensor is configured to produce measurements of differential pressure between an ambient atmospheric pressure and a pressure caused by airflow through at least a portion of the aerosol delivery device. The sensor is also configured to convert the measurements of differential pressure to corresponding electrical signals. The microprocessor is configured to receive the corresponding electrical signals and operate in an active mode only in an instance in which the differential pressure is at least a 10 threshold differential pressure. The microprocessor in the active mode is configured to control the heating element to activate and vaporize components of the aerosol precursor composition.