EGR Particle Filter with 3/Ox Coating for Wet Soot Control
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Solution Overview
Problem
Gasoline engines face challenges with contamination and clogging in exhaust gas recirculation systems due to 'wet soot' deposits, leading to reduced combustion efficiency and increased pollutant emissions, which existing technologies have not adequately addressed.
Innovation Solution
Incorporating a particle filter with a 3/Ox-coating in the exhaust gas recirculation system, combined with a cooler, to oxidize hydrocarbons and reduce NOx, thereby preventing soot adherence and facilitating filter regeneration, while maintaining operational reliability and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an exhaust gas recirculation system is used in gasoline engines, then combustion efficiency can be improved, but contamination and clogging due to wet soot deposits occur
Solution Approach 1:
The particle filter is positioned upstream of the EGR cooler to perform particle separation before the exhaust gas is cooled. This preliminary action prevents particles from condensing and adhering to surfaces during the cooling process, thereby avoiding wet soot deposits while maintaining combustion efficiency benefits
Solution Approach 2:
The particle filter acts as an intermediary component between the exhaust gas source and the EGR cooler. It captures and removes particles from the exhaust gas stream before the gas enters the cooler, preventing the formation of contaminating deposits in the recirculation system
2Object-affected harmful factors
If a particle filter is placed in the EGR system, then soot particles can be separated, but the system complexity increases
Solution Approach 1:
The particle filter is integrated into the existing EGR system architecture by positioning it at a strategic location upstream of the cooler. This merging approach combines the particle separation function with the existing recirculation flow path, achieving contamination reduction without requiring a completely separate complex system
Solution Approach 2:
The particle filter is placed at a specific location upstream of the EGR cooler where the exhaust gas temperature and flow conditions are optimal for particle separation. This localized placement ensures effective particle removal while minimizing interference with other EGR system components and maintaining overall system simplicity
3Stability of the object's composition
If the exhaust gas is cooled in the EGR system, then combustion stability can be improved, but wet soot deposits form more readily
Solution Approach 1:
The particle filter performs particle removal before the exhaust gas enters the cooler. This preliminary separation action ensures that particles are already captured when cooling occurs, preventing them from condensing and forming wet soot deposits during the cooling process while still allowing the cooler to improve combustion stability
Solution Approach 2:
The system uses the cooling process to condense water vapor, which then helps wash captured particles into the filter collection areas. This converts the potential harm of condensation into a beneficial cleaning mechanism that enhances particle removal efficiency without creating problematic wet soot deposits in the recirculation lines
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 reduces soot contamination, enhances combustion stability, and allows for increased exhaust gas recirculation rates, leading to improved engine efficiency and reduced fuel consumption.
Implementation Method 1
a particle filter with a 3/Ox-coating in the exhaust gas recirculation system, combined with a cooler, to oxidize hydrocarbons and reduce NOx
Implementation Method 2
to oxidize hydrocarbons and reduce NOx, thereby preventing soot adherence and facilitating filter regeneration
Implementation Method 3
the cooler prevents the adhesion of particles to the downstream components of the fresh air system and of the EGR system
Data Source
AI summary
An exhaust gas recirculation system for a gasoline engine, including an exhaust gas line, which can be connected to an exhaust manifold of the gasoline engine and which includes a turbine, and an inlet line, which can be connected to an intake manifold of the gasoline engine and which includes a compressor. A main exhaust gas catalytic converter is provided in the exhaust gas line, and at least one exhaust gas recirculation line_I is provided which branches off from the exhaust gas line upstream of the turbine and opens into the inlet line downstream of the compressor. At least one particle filter_I is provided which is placed in the exhaust gas recirculation line_I or in the exhaust gas line upstream of the exhaust gas recirculation line_I. The particle filter_I has a 3/Ox coating, and at least one cooler_I is provided within the exhaust gas recirculation line_I downstream of the at least one particle filter.