Air pressure sensor for an aerosol delivery device

• US 11,096,419 B2
• Filed: 01/29/2019
• Issued: 08/24/2021
• Est. Priority Date: 01/29/2019
• Status: Active Grant

• Current Assignee: RAI STRATEGIC HOLDINGS, INC. (British American Tobacco PLC)
• Original Assignee: RAI STRATEGIC HOLDINGS, INC. (British American Tobacco PLC)
• Inventors: Sur, Rajesh
• Primary Examiner(s): Yaary, Eric
• Application Number:
  US16/260,901
• Publication Number:
  US 20200236993A1
• Time in Patent Office: 938 Days
• CPC Class Codes: A24F 13/00 Appliances for smoking cigars or cigarettes
• CPC Class Codes: A24F 25/00 Devices used by the smoker for controlling the moisture content of, or for scenting, cigars, cigarettes or tobacco
• CPC Class Codes: A24F 40/05 Devices without heating means
• CPC Class Codes: A24F 40/51 Arrangement of sensors

Abstract

An aerosol delivery device is provided. The aerosol delivery device includes a power source, an aerosol production component, a sensor to produce measurements of atmospheric air pressure in an air flow path through at least one housing, and a switch coupled to and between the power source and the aerosol production component. The aerosol delivery device also includes processing circuitry coupled to the sensor and the switch. The processing circuitry determines a difference between the measurements of atmospheric air pressure from the sensor and a reference atmospheric air pressure. Only when the difference is at least a threshold difference, the processing circuitry outputs a signal to cause the switch to switchably connect and disconnect an output voltage from the power source to the aerosol production component to power the aerosol production component for an aerosol-production time period.

Claims

1. An aerosol delivery device comprising:

an aerosol production component powerable to produce an aerosol from an aerosol precursor composition;

a sensor configured to produce measurements of atmospheric air pressure; and

processing circuitry coupled to the sensor, and configured to

cause the aerosol production component to produce the aerosol for an aerosol-production time period, responsive to at least a threshold difference between the measurements of atmospheric air pressure from the sensor, and a reference atmospheric air pressure,

wherein outside the aerosol-production time period, the sensor is configured to produce a measurement of ambient atmospheric air pressure to which the sensor is exposed, and the processing circuitry is configured to set the reference atmospheric air pressure based on the measurement of ambient atmospheric air pressure, and

wherein the processing circuitry is further configured to activate an aircraft mode protocol to prevent activation of the aerosol production component, responsive to the reference atmospheric air pressure or a change in the reference atmospheric air pressure that indicates the aerosol delivery device is on an aircraft.

2. The aerosol delivery device of claim 1, wherein the sensor is an absolute pressure sensor.

3. The aerosol delivery device of claim 1, wherein the sensor is configured to periodically produce the measurement of ambient atmospheric air pressure, and the processing circuitry is configured to periodically set the reference atmospheric air pressure based on the measurement of ambient atmospheric air pressure.

4. The aerosol delivery device of claim 1, wherein the threshold difference is set to reflect a minimum deviation from the reference atmospheric air pressure caused by a puff action of using the aerosol delivery device by a user.

5. The aerosol delivery device of claim 4, wherein the processing circuitry is configured to cause the aerosol production component to produce the aerosol for the aerosol-production time period that is coextensive with the puff action.

6. The aerosol delivery device of claim 1, wherein the aerosol precursor composition comprises one or more of a liquid, solid or semi-solid.

7. The aerosol delivery device of claim 1, wherein the aerosol delivery device further comprises a switch, and the processing circuitry is configured to output a pulse width modulation (PWM) signal with an adjustable duty cycle to cause the switch to switchably power the aerosol production component to produce the aerosol.

8. The aerosol delivery device of claim 7, wherein at a periodic rate during the aerosol-production time period, the processing circuitry is further configured to:

determine a sample window of measurements of instantaneous actual power provided to the aerosol production component, each measurement of the sample window of measurements being determined as a product of a voltage at and a current through the aerosol production component;

calculate a moving average power provided to the aerosol production component based on the sample window of measurements of instantaneous actual power;

compare the moving average power to a power set point; and

output the PWM signal to cause the switch to respectively disconnect and connect power to the aerosol production component at each instance in which the moving average power is respectively above or below the power set point.

9. The aerosol delivery device of claim 1, further comprising signal conditioning circuitry coupled to the sensor and the processing circuitry, and configured to manipulate the measurements of atmospheric air pressure to produce one or more conditioned measurements of atmospheric air pressure, and

wherein the processing circuitry is configured to determine a difference between the measurements of atmospheric air pressure and the reference atmospheric air pressure based on the one or more conditioned measurements of atmospheric air pressure.

10. The aerosol delivery device of claim 1, wherein the processing circuitry comprises a processor and a memory storing executable instructions that, in response to execution by the processor, cause the processing circuitry to at least:

perform one or more error corrections to facilitate software calibration to ensure accurate reading of the measurements of atmospheric air pressure from the sensor.

11. A control body for an aerosol delivery device, the control body comprising:

an aerosol production component or terminals configured to connect the aerosol production component to the control body, the aerosol production component being powerable to produce an aerosol from an aerosol precursor composition;

a sensor configured to produce measurements of atmospheric air pressure; and

processing circuitry coupled to the sensor, and configured to at least;

cause the aerosol production component to produce the aerosol for an aerosol-production time period, responsive to at least a threshold difference between the measurements of atmospheric air pressure from the sensor, and a reference atmospheric air pressure,

wherein outside the aerosol-production time period, the sensor is configured to produce a measurement of ambient atmospheric air pressure to which the sensor is exposed, and the processing circuitry is configured to set the reference atmospheric air pressure based on the measurement of ambient atmospheric air pressure, and

wherein the processing circuitry is further configured to activate an aircraft mode protocol to prevent activation of the aerosol production component, responsive to the reference atmospheric air pressure or a change in the reference atmospheric air pressure that indicates the aerosol delivery device is on an aircraft.

12. The control body of claim 11, wherein the sensor is an absolute pressure sensor.

13. The control body of claim 11, wherein the sensor is configured to periodically produce the measurement of ambient atmospheric air pressure, and the processing circuitry is configured to periodically set the reference atmospheric air pressure based on the measurement of ambient atmospheric air pressure.

14. The control body of claim 11, wherein the threshold difference is set to reflect a minimum deviation from the reference atmospheric air pressure caused by a puff action of using the aerosol delivery device by a user.

15. The control body of claim 14, wherein the processing circuitry is configured to cause the aerosol production component to produce the aerosol for the aerosol-production time period that is coextensive with the puff action.

16. The control body of claim 11, wherein the aerosol precursor composition comprises one or more of a liquid, solid or semi-solid.

17. The control body of claim 11, wherein the control body further comprises a switch, and the processing circuitry is configured to output a pulse width modulation (PWM) signal with an adjustable duty cycle to cause the switch to switchably power the aerosol production component to produce the aerosol.

18. The control body of claim 17, wherein at a periodic rate during the aerosol-production time period, the processing circuitry is further configured to:

determine a sample window of measurements of instantaneous actual power provided to the aerosol production component, each measurement of the sample window of measurements being determined as a product of a voltage at and a current through the aerosol production component;

calculate a moving average power provided to the aerosol production component based on the sample window of measurements of instantaneous actual power;

compare the moving average power to a power set point; and

output the PWM signal to cause the switch to respectively disconnect and connect power to the aerosol production component at each instance in which the moving average power is respectively above or below the power set point.

19. The control body of claim 11, further comprising signal conditioning circuitry coupled to the sensor and the processing circuitry, and configured to manipulate the measurements of atmospheric air pressure to produce one or more conditioned measurements of atmospheric air pressure, and

wherein the processing circuitry is configured to determine a difference between the measurements of atmospheric air pressure and the reference atmospheric air pressure based on the one or more conditioned measurements of atmospheric air pressure.

20. The control body of claim 11, wherein the processing circuitry comprises a processor and a memory storing executable instructions that, in response to execution by the processor, cause the processing circuitry to at least:

perform one or more error corrections to facilitate software calibration to ensure accurate reading of the measurements of atmospheric air pressure from the sensor.