Exhaust Gas Pressure Sensor Baffle for Particle Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas pressure sensors face challenges in accurately sensing pressure while being exposed to exhaust gases due to particle contamination and pressure pulses, leading to potential damage and malfunction.
Innovation Solution
A baffle assembly with a conduit and a plate having strategically positioned apertures that separate the exhaust gas volume into two portions, directing the gas to impinge on the sensor's end surface while keeping the diaphragm clear of particles, enhancing durability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the exhaust gas pressure sensor is directly exposed to exhaust gas in the exhaust manifold, then the sensor can accurately sense pressure, but the sensor is damaged by particle contamination and pressure pulses
Solution Approach 1:
The exhaust gas volume is segmented into a first portion and a second portion using a plate with apertures. This segmentation allows the sensor to be positioned in the second portion protected from direct particle exposure while still receiving pressure information through the apertures in the plate.
Solution Approach 2:
The plate with apertures acts as an intermediary between the exhaust gas and the sensor. It filters out particles while allowing pressure transmission, protecting the sensor from direct exposure to harmful exhaust components while maintaining measurement capability.
2Reliability
If the sensor is protected from exhaust gas exposure, then particle contamination is reduced, but pressure sensing accuracy deteriorates
Solution Approach 1:
The plate provides different local qualities: the apertures allow pressure transmission while the plate material blocks particle passage. This local differentiation enables simultaneous protection and accurate sensing by providing the right property (permeability to pressure, impermeability to particles) at the right location.
Solution Approach 2:
The solution moves from a one-dimensional protection approach (blocking all exhaust gas) to a multi-dimensional approach by creating a three-dimensional structure with the plate and apertures that selectively transmits pressure while blocking particles, adding a new dimension of selective permeability.
3Reliability
If the plate is positioned close to the sensor, then particle protection is improved, but pressure transmission is reduced
Solution Approach 1:
The spacing between the plate and sensor is optimized as a critical parameter. By adjusting this distance, the system achieves the right balance between particle protection (closer spacing) and pressure transmission (greater spacing), finding the optimal value that satisfies both requirements.
4Measurement precision
If the apertures are large, then pressure transmission is improved, but particle contamination increases
Solution Approach 1:
The apertures provide local quality of selective permeability - large enough to transmit pressure effectively but small enough to block particles. The plate material at the aperture edges provides the filtering function while the aperture opening provides pressure transmission.
Solution Approach 2:
The plate with multiple apertures functions as a porous structure that selectively permits pressure transmission while blocking particle passage. The aperture size and distribution are designed to achieve the desired filtering and transmission characteristics.
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
The solution improves the durability and accuracy of the exhaust gas pressure sensor by ensuring consistent pressure measurement and preventing particle contamination, thereby reducing damage and malfunction.
Implementation Method 1
a plurality of apertures disposed through the plate and configured to provide fluid communication of the exhaust gas between the first portion of the exhaust gas volume and the second portion of the exhaust gas volume
Implementation Method 2
an exhaust gas pressure sensor configured to sense a pressure of exhaust gas at the exhaust manifold
Data Source
AI summary
A baffle of an exhaust gas pressure sensor assembly is disposed at an exhaust manifold of an internal combustion engine and includes an exhaust gas pressure sensor configured to sense a pressure of exhaust gas at the exhaust manifold. The baffle includes a conduit, a plate disposed within the conduit separating the exhaust gas volume into a first portion and a second portion, and a plurality of apertures disposed through the plate and configured to provide fluid communication of the exhaust gas between the first portion of the exhaust gas volume and the second portion of the exhaust gas volume such that each of the plurality of apertures is centered radially outside of an inner passageway to a diaphragm of the exhaust gas pressure sensor.