Movable Exhaust Filter Passage for Soot Control

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Solution Overview

Problem

Internal combustion engines face challenges in maintaining stable operation with a rich air-fuel mixture, leading to wet soot formation that degrades exhaust-gas components, particularly the turbocharger turbine, due to the transition from lean to rich operation and limited flow control in existing exhaust aftertreatment systems.

Innovation Solution

An exhaust aftertreatment device with a variably adjustable filter passage in the exhaust manifold, controlled by a lambda value, which constricts the exhaust flow during rich operation to capture wet soot and prevent deposition on the turbocharger turbine, while maintaining a large through-path during normal operation to minimize filtration impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a filter is positioned in the exhaust system to capture soot, then soot deposition on downstream components is reduced, but exhaust flow resistance increases and turbocharger performance deteriorates

Engineering Contradiction:

Improvesoot deposition on exhaust componentsVSAvoidexhaust flow rate to turbocharger

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The filter passage cross-sectional area is made dynamically adjustable through movable filtration walls that can change position based on engine operating conditions. This allows the filter to adapt its filtration intensity to match actual soot production levels, maintaining optimal exhaust flow while capturing soot when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the physical parameter of filter passage cross-sectional area by moving filtration walls between different positions. This parameter adjustment enables the filter to vary between high filtration mode (when soot is present) and low resistance mode (when exhaust flow is priority), resolving the contradiction between soot capture and flow rate.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If the filter passage is constricted to increase filtration efficiency, then soot capture improves, but exhaust flow volume decreases

Engineering Contradiction:

Improvefiltration efficiencyVSAvoidexhaust flow passage volume

Core Design Contradiction:

Manufacturing precisionVSVolume of stationary object

Solution Approach 1:

The filtration walls are designed to move dynamically between different positions, allowing the filter passage cross-sectional area to be adjusted in real-time. This creates a dynamic balance between filtration efficiency and exhaust flow volume based on actual engine operating conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The movable filtration wall system enables the same filter structure to perform multiple functions: high-efficiency soot filtration when walls are in constricted position, and low-resistance exhaust flow when walls are in open position. This multi-functionality resolves the contradiction between filtration efficiency and flow volume.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If a fixed filter is used in the exhaust system, then soot filtration is provided, but flow control flexibility is lost and turbocharger airflow is restricted

Engineering Contradiction:

Improvewet soot depositionVSAvoidexhaust flow control flexibility

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The filter transitions from a fixed structure to a dynamic system with movable filtration walls controlled by a control unit. This allows the filter to adapt its characteristics based on engine operating conditions, lambda values, and soot production levels, providing both soot filtration and flow control flexibility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control unit receives feedback about engine operating conditions and adjusts the filtration wall positions accordingly. This feedback control enables the system to maintain optimal balance between soot capture and exhaust flow, providing adaptability while preventing soot deposition on downstream components.

Inventive Principle:

Principle #23Feedback

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 solution allows for stable rich air-fuel mixture operation while reducing wet soot deposition on exhaust-gas components, maintaining performance and reducing the need for additional fuel, with the adjustable filter passage effectively capturing soot and allowing for filtration control based on engine conditions.

Implementation Method 1

a filter passage with, for the exhaust-gas stream, a through-path that is variably adjustable

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Data Source

PatentUS9109496B2System and method for a movable exhaust aftertreatment device in an internal combustion engine

Publication Date: 2015.08.18 FORD GLOBAL TECH LLC

AI summary

The present application relates to an exhaust-gas aftertreatment device and to a method for exhaust-gas aftertreatment. According to one aspect of the present application, the exhaust-gas aftertreatment device has, in the exhaust manifold of the internal combustion engine, a filter passage with, for the exhaust-gas stream, a through-path that is variably adjustable over time during the operation of the exhaust-gas aftertreatment device.