Sensor Element Inlet Ribs for Fluid Particle Separation
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Solution Overview
Problem
Conventional sensor elements for measuring fluid medium properties, particularly in internal combustion engine intake tracts, face challenges in protecting against water and dirt particles, leading to false readings and permanent changes in pressure sensor characteristics due to dirt deposits.
Innovation Solution
The sensor element features a housing with an inlet opening designed with alternating ribs that deflect the fluid flow, ensuring that water and dirt particles are separated from the pressure sensor, preventing false readings and maintaining sensor accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the inlet opening is left open for direct pressure measurement, then the pressure sensor can accurately detect fluid medium properties, but water and dirt particles can enter and cause false readings and permanent damage
Solution Approach 1:
The inlet opening is segmented into multiple flow paths by alternating ribs that extend from opposite walls. This segmentation creates separate channels that guide fluid flow while blocking particle access to the pressure sensor, effectively dividing the inlet space to achieve both measurement accuracy and protection.
Solution Approach 2:
The alternating ribs act as an intermediary structure between the inlet opening and the pressure sensor. They mediate the flow of fluid medium while preventing direct access of water and dirt particles to the sensor, serving as a protective barrier that maintains measurement functionality.
2Reliability
If protective structures are added to the inlet opening, then the pressure sensor is protected from particles, but the device complexity increases
Solution Approach 1:
The protection structure is achieved through segmentation of the inlet opening using simple alternating ribs rather than complex protective mechanisms. These ribs create multiple flow paths and barriers using minimal structural elements, reducing complexity compared to traditional protective designs.
Solution Approach 2:
The alternating ribs are strategically positioned only where needed to deflect particles away from the pressure sensor while maintaining open flow paths for fluid medium. This localized protection approach avoids unnecessary structural complexity in areas where protection is not required.
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 design effectively protects pressure sensors from water and dirt, preventing temporary and permanent false readings and ensuring accurate air mass measurement by ensuring only dry air reaches the sensor, thus maintaining the integrity of the pressure measurements.
Implementation Method 1
a plurality of ribs protrude from opposite walls into the inlet opening in an alternating fashion, wherein the ribs are designed to deflect a flow of the fluid medium towards the pressure sensor
Implementation Method 2
at least one pressure sensor for detecting the pressure of the fluid medium is arranged in the inlet opening in a pressure tap
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
The invention relates to a sensor element (110) for detecting at least one property of a fluid medium. The sensor element (110) has at least one housing (120) with at least one inlet opening (124) that can be accessed by the fluid medium. At least one pressure sensor (132) for detecting a pressure of the fluid medium is arranged in the inlet opening (124). In the inlet opening (124) and before the pressure sensor (132), a plurality of ribs (138) project from at least one wall (134, 136) of the inlet opening (124) into the inlet opening (124).