Pressure Sensor Segmentation for Absolute Pressure Detection
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Solution Overview
Problem
Existing pressure sensors that measure absolute pressure require airtightness to maintain detection accuracy, which can be compromised by seal member damage due to vibration or impact, leading to deteriorated detection accuracy.
Innovation Solution
A pressure sensor design that includes a case with an inner space in communication with the outer space, equipped with a pressure detector for gauge pressure and an atmospheric pressure detector, along with an arithmetic unit to calculate absolute pressure, eliminating the need for airtightness and allowing installation in a smaller space, and incorporating a temperature sensor for accurate temperature correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure standard chamber is formed in the inner space of the case to detect absolute pressure, then detection accuracy for absolute pressure is improved, but the need for seal members and airtightness requirements increase device complexity and reliability risks
Solution Approach 1:
The invention divides the pressure detection function into two independent parts: a pressure detector in the inner space for gauge pressure measurement and an atmospheric pressure detector in the outer space for atmospheric pressure measurement. This segmentation eliminates the need for a sealed standard chamber while maintaining absolute pressure detection capability through computational combination of the two measurements.
Solution Approach 2:
The invention replaces the mechanical sealing system (seal members, airtight chambers) with an electronic/computational system. Instead of physically isolating the pressure sensor in a sealed chamber, the system uses electronic detectors in separate locations and an arithmetic unit to compute absolute pressure from gauge pressure and atmospheric pressure measurements, thereby eliminating mechanical sealing requirements.
2Measurement precision
If seal members are used to ensure airtightness of the inner space, then absolute pressure detection is enabled, but reliability deteriorates when seal members are damaged by vibration or impact
Solution Approach 1:
The invention extracts the atmospheric pressure detection function from the sealed inner space and places it in the outer space. This extraction eliminates the dependency on seal members for maintaining airtightness, as the atmospheric pressure detector operates independently in the external environment, thereby improving reliability while preserving absolute pressure measurement capability.
3Device complexity
If the atmospheric pressure detector is installed in the outer space of the case, then device complexity is reduced, but the space required for installation increases
Solution Approach 1:
The invention merges the atmospheric pressure detector with the circuit board that houses other electronic components. By integrating the atmospheric pressure detector into the existing circuit board structure, the design achieves space efficiency while maintaining the benefit of reduced sealing complexity. This consolidation allows multiple functions (signal processing, atmospheric pressure sensing) to share the same housing space.
Data Source
AI summary
A pressure sensor includes a cylindrical case defining an inner space in communication with an outer space; a pressure detector provided in the inner space and configured to detect a gauge pressure of a target fluid; an atmospheric pressure detector configured to detect an atmospheric pressure; and an electronic component configured to calculate an absolute pressure of the target fluid on a basis of the gauge pressure and the atmospheric pressure. The absolute pressure is obtained without requiring airtightness of the case between the inner space and the outer space, and thus, there is no requirement for a seal member to be included between the inner space and the outer space.