Piezoelectric Pump Exhalation Measurement Device Pulsation Control

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Solution Overview

Problem

Conventional exhalation measurement devices suffer from low sensing accuracy due to pulsation in the exhalation flow supplied by electromagnetic pumps, leading to variance in sensed values.

Innovation Solution

The implementation of an exhalation measurement device using a piezoelectric pump with a chamber to hold exhalation, where a first learning controller sets operational parameters before and a second learning controller adjusts after the pump starts, ensuring stable and accurate flow to the measurement component.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an electromagnetic pump is used to supply exhalation to the measurement component, then the exhalation can be supplied continuously, but the pulsation in the exhalation flow increases leading to lower sensing accuracy

Engineering Contradiction:

Improvecontinuous supply capabilityVSAvoidsensing accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent replaces the electromagnetic pump with a piezoelectric pump, substituting one mechanical pumping mechanism with another that operates on different principles. The piezoelectric pump uses piezoelectric elements to generate micro-vibrations that move the exhalation flow, resulting in significantly reduced pulsation compared to electromagnetic pumps while maintaining continuous supply capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operating parameters of the pump system by selecting a piezoelectric pump with specific characteristics (short stroke, low pulsation) instead of an electromagnetic pump. This parameter change in the pump type fundamentally alters the flow characteristics, reducing pulsation and improving sensing accuracy while preserving continuous flow supply.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If operational setting is performed only before the piezoelectric pump supplies exhalation, then the initial state is optimized, but environmental changes during operation reduce sensing accuracy

Engineering Contradiction:

Improveinitial sensing accuracyVSAvoidenvironmental adaptation

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent implements a feedback mechanism where the controller continuously monitors the operational state of the piezoelectric pump and adjusts operational settings in real-time. By performing operational setting both before and during the exhalation supply process, the system receives feedback about environmental changes and pump performance, allowing it to maintain optimal sensing accuracy despite temperature or other environmental variations.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent transitions from a static operational setting (performed only once before operation) to a dynamic setting process where operational parameters are continuously adjusted during operation. This dynamic approach allows the system to adapt to changing environmental conditions, maintaining optimal performance throughout the measurement process.

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If a piezoelectric pump with short stroke is used, then pulsation is reduced improving sensing accuracy, but the pump complexity increases

Engineering Contradiction:

Improvesensing accuracyVSAvoidpump structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the electromagnetic pump system with a piezoelectric pump system, utilizing piezoelectric effects to achieve short-stroke operation. This substitution inherently provides reduced pulsation and improved sensing accuracy. The piezoelectric mechanism, while different in principle, integrates into the existing pump structure without significantly increasing overall device complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical 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

This configuration reduces pulsation and variance in the exhalation flow, significantly improving sensing accuracy by optimizing the piezoelectric pump's settings for the usage environment.

Implementation Method 1

a piezoelectric pump that supplies the measurement component with the exhalation held in the chamber

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS11193480B2Exhalation measurement device, and control method

Publication Date: 2021.12.07 PHC HLDG CORP

AI summary

The exhalation measurement device of certain implementations comprise a chamber, a measurement component, a piezoelectric pump, a first learning controller, and a second learning controller. The chamber may temporarily hold exhalation. The measurement component may measure a specific component in the exhalation. The piezoelectric pump may supply the measurement component with the exhalation held in the chamber. The first learning controller may perform operational setting on the piezoelectric pump before the piezoelectric pump supplies the exhalation in the chamber to the measurement component. The second learning controller may perform operational setting on the piezoelectric pump after the piezoelectric pump has started supplying the exhalation in the chamber to the measurement component, but before the measurement component performs its measurement.