Particle Filter Liquid-Tight Layer Segmentation
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Solution Overview
Problem
Existing particle filters in internal combustion engines, particularly Otto particle filters, are prone to saturation and failure due to liquid accumulation, leading to increased exhaust-gas counterpressure, potential blockage, and vehicle breakdowns, especially at low temperatures.
Innovation Solution
Incorporating a liquid-tight layer within the filter body arrangement to separate filter elements, oriented either perpendicular or parallel to the direction of gravity, prevents saturation and maintains effective exhaust-gas aftertreatment by preventing liquid from reaching all filter elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a particle filter with porous ceramic structure is used to filter soot particles, then filtration efficiency is improved, but the filter becomes susceptible to liquid saturation and failure
Solution Approach 1:
The filter body is divided into multiple filter body elements (first filter body element, second filter body element, etc.) that are separated by liquid-tight layers. This segmentation prevents liquid from saturating the entire filter body, as liquid can only affect individual elements below the liquid level rather than the complete filtration structure.
Solution Approach 2:
Liquid-tight layers are introduced as intermediary structures between the filter body elements. These layers act as barriers that prevent liquid penetration into the porous ceramic structures, thereby protecting the filtration function from liquid-induced failure while maintaining the high filtration efficiency of the porous ceramic material.
2Quantity of substance
If liquid accumulates in the exhaust-gas aftertreatment device, then the filter body arrangement becomes saturated, but this leads to increased exhaust-gas counterpressure and potential blockage
Solution Approach 1:
The filter body arrangement is segmented into multiple elements separated by liquid-tight layers. When liquid accumulates, only the filter body elements below the liquid level become saturated, while elements above remain functional. This segmentation prevents complete blockage and maintains exhaust-gas flow paths, thereby limiting the increase in exhaust-gas counterpressure.
Solution Approach 2:
Different regions of the filter body arrangement have different liquid exposure conditions. The liquid-tight layers create local protection zones where filter body elements above the liquid level maintain their filtration function without saturation, while elements below the liquid level experience liquid contact. This local differentiation ensures that liquid accumulation does not uniformly affect the entire filter, preventing system-wide blockage.
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
Ensures failure-resistant and effective exhaust-gas aftertreatment by preventing filter element saturation, reducing thermal stresses, and minimizing the risk of blockage and damage, even in adverse conditions.
Implementation Method 1
the porous structure of the filter body element, the latter can potentially be saturated completely with water, even if only a lower part of the filter body element in the direction of action of gravity is in water. The risk of saturation is present particularly when the particle filter is used as underbody particle filter.
Data Source
AI summary
A particle filter includes a particle filter housing and a filter body arrangement which is accommodated in the particle filter housing and is configured to separate particles out of an exhaust-gas flow that is emitted by an internal combustion engine and passes through the filter body arrangement when the latter is used as intended. The filter body arrangement has filter body elements that are separated from one another by at least one liquid-tight layer that is oriented at least substantially in the direction of longitudinal extension of the particle filter. Further aspects relate to an exhaust-gas aftertreatment device for an internal combustion engine, and to a motor vehicle.