Pressure Sensor Port Rib Segmentation for Debris Blockage
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Solution Overview
Problem
Pressure sensor assemblies in motor vehicles are prone to blockage by dust and debris, which impairs their performance in sensing air pressure changes for side impact detection.
Innovation Solution
A pressure sensor assembly with a housing and sensor port design featuring a longitudinal rib that protrudes from the exterior aperture, offset from the center, and a transverse rib, which together create multiple aperture sections with varying cross-sectional areas and shapes, reducing the likelihood of blockage by debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor port has a simple open aperture design, then the manufacturing is simple and cost-effective, but the port is easily blocked by dust and debris
Solution Approach 1:
The port aperture is segmented into multiple sections by adding longitudinal and transverse ribs that divide the opening into separate zones. This segmentation prevents complete blockage by ensuring that debris must simultaneously block multiple sections to impede sensor operation, thereby resolving the contradiction between simple structure and blockage resistance.
Solution Approach 2:
The longitudinal rib is positioned off-center relative to the aperture, creating asymmetric aperture sections with different cross-sectional areas. This asymmetric design optimizes debris prevention by strategically placing structural elements to maximize the difficulty of complete blockage while maintaining manufacturing feasibility.
2Reliability
If the longitudinal rib is positioned off-center, then the aperture sections have varied cross-sectional areas improving debris prevention, but the manufacturing precision requirements increase
Solution Approach 1:
The off-center positioning of the longitudinal rib creates local quality variations in the aperture sections, with different cross-sectional areas optimized for specific debris prevention functions. This local differentiation improves overall reliability while the rib integration with the housing structure maintains manufacturing feasibility through standard molding techniques.
3Object-affected harmful factors
If the exterior aperture is oriented at an acute angle, then debris accumulation is reduced, but the sensor housing design complexity increases
Solution Approach 1:
Instead of orienting the aperture perpendicular to the housing surface as is conventional, the exterior aperture is inverted to an acute angle orientation. This unconventional positioning exploits gravity and airflow patterns to reduce dust accumulation and migration toward the sensor, while the angle is integrated into the housing geometry to maintain design simplicity.
Data Source
AI summary
A pressure sensor port having reduced potential for blockage of a sensor by debris in a fluid. The pressure sensor includes a housing forming the sensor port. The sensor port defines an internal passage connecting an exterior aperture to an interior aperture. The exterior aperture communicates the fluid to the internal passage and includes a longitudinal rib. The interior aperture is aligned with a pressure transducer within the housing and the fluid in the internal passage to engage the pressure sensor. The longitudinal rib includes a first end proximal to the exterior aperture. The longitudinal rib is slightly off-center within the exterior aperture, defining at least first and second aperture sections having different cross-sectional areas.