Particulate Filter with Straight-Flow Bypass for Pressure Loss Control
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Solution Overview
Problem
Existing particulate filters in exhaust gas purification devices face issues with filter clogging due to particulate matter accumulation, leading to increased pressure loss, which affects fuel efficiency and engine performance, especially during regeneration deficiencies or low exhaust temperature conditions.
Innovation Solution
The exhaust gas purification device incorporates a novel structure with a wall-flow part and a straight-flow part, where the straight-flow part allows exhaust gas to flow preferentially when particulate matter accumulates, maintaining low pressure loss even when the wall-flow part becomes clogged, by adjusting the ratio of exhaust gas flow through both parts and optimizing cell arrangements and cross-sectional areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wall-flow particulate filter is used to capture particulate matter, then particulate matter trapping efficiency is improved, but pressure loss increases when particulate matter accumulates in the filter
Solution Approach 1:
The filter is divided into multiple cells (first cell, second cell, third cell, fourth cell) arranged in a specific pattern. The segmentation allows the exhaust gas flow to be distributed across multiple pathways, preventing any single cell from becoming completely blocked while maintaining overall filtration capability. This resolves the contradiction by preserving trapping efficiency through the segmented wall-flow structure while reducing pressure loss through parallel flow paths.
Solution Approach 2:
A communication hole is introduced as an intermediary element that connects adjacent cells (first and second cells, third and fourth cells). This communication hole allows exhaust gas to pass between cells when the primary wall-flow paths become blocked by particulate matter accumulation. The intermediary communication holes maintain gas flow continuity, preventing complete clogging while preserving the wall-flow filtration mechanism, thus resolving the pressure loss issue without sacrificing trapping efficiency.
2Reliability
If filter regeneration is performed by burning off particulate matter, then particulate matter accumulation is reduced, but fuel consumption increases and engine problems may occur
Solution Approach 1:
The communication holes are pre-configured in the filter structure before operation begins. This preliminary design feature ensures that when particulate matter accumulation starts to increase pressure loss, the communication holes automatically provide alternative flow paths without requiring active regeneration. This preliminary structural preparation reduces the need for frequent high-temperature regeneration events, thereby reducing fuel consumption while maintaining filter performance.
Solution Approach 2:
The filter structure with communication holes enables self-regulation of gas flow when clogging occurs. The system automatically redirects exhaust gas through communication holes when wall-flow paths are blocked, providing self-service functionality that maintains performance without external intervention or energy-intensive regeneration, thus reducing fuel consumption while preserving filter effectiveness.
3Loss of energy
If the filter structure is made more complex to prevent clogging, then pressure loss suppression is improved, but device complexity increases
Solution Approach 1:
The communication holes are strategically placed only at specific locations where adjacent cells meet, rather than throughout the entire filter structure. This local quality approach adds complexity only where necessary to maintain flow paths, while keeping the majority of the filter structure simple and maintaining the wall-flow configuration. The localized addition of communication holes effectively suppresses pressure loss without proportionally increasing overall device complexity.
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 configuration effectively suppresses pressure loss increases, preventing adverse effects on fuel efficiency and engine performance, while maintaining high particulate matter trapping efficiency, even under conditions of filter clogging.
Implementation Method 1
the particulate matter is captured and removed at the wall surface and in the pores in the interior of the wall
Implementation Method 2
filter regeneration is carried out by establishing a high-temperature exhaust gas flow and burning off the particulate matter
Data Source
AI summary
The exhaust gas purification device provided with a particulate filter disposed in an exhaust passage of an internal combustion engine and capturing particulate matter in exhaust gas discharged from the internal combustion engine. The particulate filter is provided with a wall-flow part having an inlet-side cell that is open only at an end on an exhaust gas inflow side, an outlet-side cell that is adjacent to this inlet-side cell and is open only at an end on an exhaust gas outflow side, and a porous wall that partitions the inlet-side cell from the outlet-side cell, and is also provided with a straight-flow part having a through cell that penetrates the filter in an axial direction thereof and is open at the end on the exhaust gas inflow side as well as the end on the exhaust gas outflow side.