Pressure-measuring plug soot filter channel
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pressure-measuring plugs for combustion engines suffer from soot accumulation, which reduces sensitivity to pressure changes and affects durability due to the deposition of soot on the circular membrane and strain gauges, leading to signal drift and mechanical changes.
Innovation Solution
A pressure-measuring plug design that incorporates a channel structure forcing soot particles to change direction and hit a hot surface, where they burn up, preventing direct contact with the membrane and using a platinum coating to oxidize unburned fuel and carbon, thereby reducing soot accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure-measuring plug uses a circular membrane directly exposed to the combustion chamber, then pressure measurement sensitivity is improved, but soot accumulation on the membrane reduces sensitivity and causes signal drift over time
Solution Approach 1:
A channel structure is introduced as an intermediary between the combustion chamber and the circular membrane. This channel forces soot particles to change direction and deposit on the channel walls rather than reaching the membrane, while still allowing pressure transmission. The channel acts as a mediator that separates the harmful soot particles from the sensitive measurement components while maintaining the functional connection for pressure sensing.
Solution Approach 2:
The channel structure utilizes the inertial motion of soot particles to convert the harmful effect of soot accumulation into a beneficial separation mechanism. By designing the channel with specific bends and directions, soot particles are forced to deposit on predetermined surfaces (the channel walls) rather than on the membrane, effectively using the soot's own momentum to protect the sensor.
2Speed
If the pressure-measuring plug allows direct line of sight between combustion chamber and membrane, then pressure response speed is improved, but soot particles directly contact the membrane causing durability issues
Solution Approach 1:
The channel structure serves as a mediator that transmits pressure waves from the combustion chamber to the membrane while blocking soot particles. The channel's geometry allows rapid pressure transmission (maintaining speed) while its walls intercept soot particles before they can reach the membrane (improving durability).
Solution Approach 2:
The channel structure introduces a spatial dimension to the pressure transmission path. Instead of a direct linear connection, the pressure wave travels through a three-dimensional channel path that includes bends and turns. This dimensional complexity allows pressure to pass through rapidly while soot particles are redirected onto the channel walls through inertial effects.
3Measurement precision
If strain gauges are attached directly to the sensing structure exposed to combustion gases, then measurement accuracy is improved, but soot accumulation on strain gauges changes sensor characteristics permanently
Solution Approach 1:
The channel structure acts as a protective intermediary that shields the strain gauges and sensing structure from direct exposure to soot-laden combustion gases. By forcing soot particles to deposit on the channel walls upstream, the channel protects the measurement components while still allowing accurate pressure transmission to occur.
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 effectively reduces soot accumulation on critical sensor components, maintaining sensitivity and durability by ensuring soot particles are deposited on surfaces that burn off, thus minimizing signal drift and mechanical changes over the sensor's lifespan.
Implementation Method 1
The path forces soot particles by their mass inertia to leave the gas flow and to hit at least one of a surface of body tip section and the inner section
Implementation Method 2
soot particles are deposited on surfaces that burn off, thus minimizing signal drift and mechanical changes
Implementation Method 3
using a platinum coating to oxidize unburned fuel and carbon, thereby reducing soot accumulation
Implementation Method 4
a piezo-resistive pressure-measuring plug for a combustion engine
Data Source
AI summary
The invention relates to a pressure-measuring plug for a combustion engine comprising a plug body with a body tip section facing in use the combustion chamber and comprising a passage, a ring-shaped sensing structure comprising an outer section, an inner section and an annular diaphragm, the plug body being attached to the outer section, a circular membrane comprising an outer part coupled to the outer section and an inner part coupled to the inner section, the membrane provides a sealing protecting the annular diaphragm against the harsh environment in a combustion chamber; and, a plug chamber formed by the circular membrane and the body tip section wherein the passage of the body tip section provides an open connection between the plug chamber and the combustion chamber. The passage is part of a channel structure which functions as a soot filter.