EGR Bypass Line for Particle Filter Regeneration
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Solution Overview
Problem
Gasoline engine exhaust gas recirculation systems face challenges in particle filter regeneration due to insufficient oxygen and high sootiness, leading to reduced engine performance and increased risk of blockages, as they require specific temperature and oxygen conditions that are not consistently met, especially in stoichiometrically operated engines.
Innovation Solution
Incorporating a bypass line that branches off downstream of the turbine, allowing for independent control of exhaust gas recirculation and bypass flow, which enables regeneration of the particle filter even when the EGR valve is closed, and provides an oxygen-rich exhaust gas flow for intensified regeneration, also functioning as a wastegate to manage excess energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a particle filter is installed in the exhaust gas line of a stoichiometrically operated gasoline engine, then particle mass is retained and combustion occurs to form CO2 or H2O, but oxygen content in the exhaust gas is too low for complete combustion of particle mass
Solution Approach 1:
The exhaust gas system is segmented into multiple pathways: the main exhaust gas line, an oxygen-rich bypass line, and an EGR line. This segmentation allows oxygen-deficient exhaust gas to be mixed with oxygen-rich bypass gas specifically at the particle filter location, providing localized oxygen supplementation without disrupting the overall stoichiometric engine operation.
Solution Approach 2:
The bypass line acts as an intermediary carrier that transports oxygen-rich exhaust gas from upstream of the turbine to the particle filter area. This intermediary oxygen supply enables complete particle combustion in the filter without requiring changes to the engine's stoichiometric operation.
2Productivity
If the EGR valve is closed to prevent sootiness, then engine performance is maintained, but particle filter regeneration cannot occur due to insufficient oxygen
Solution Approach 1:
The system separates the EGR function from the particle filter oxygen supply function. The EGR valve controls exhaust gas recirculation independently, while the bypass line independently supplies oxygen-rich gas to the particle filter area. This allows the EGR valve to remain closed for performance while regeneration proceeds through the bypass line.
Solution Approach 2:
The bypass line serves multiple functions: it acts as an oxygen supply for particle filter regeneration, functions as a wastegate to manage excess turbine energy, and provides a controlled pathway for oxygen-rich exhaust gas without requiring EGR valve opening.
3Reliability
If high exhaust gas temperatures are maintained for complete particle combustion, then regeneration is effective, but risk of blockages and reduced engine performance increases
Solution Approach 1:
The system changes the oxygen concentration parameter locally at the particle filter by introducing oxygen-rich bypass gas, rather than changing the overall exhaust gas temperature across the entire system. This localized parameter change enables complete combustion at moderate temperatures, reducing blockage risk while maintaining regeneration effectiveness.
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 allows for effective particle filter regeneration across various operational ranges, reduces sootiness, and enhances engine performance by maintaining high temperatures for complete combustion, thereby preventing blockages and improving fuel efficiency.
Implementation Method 1
a turbine which is arranged in the exhaust gas line
Implementation Method 2
the particle mass which has been retained up to that point
Implementation Method 3
the particle mass which has been retained up to that point (soot particles with attached or embedded hydrocarbons) combusts under normal gasoline engine peripheral conditions, essentially to form CO2 or H2O respectively
Implementation Method 4
provides an oxygen-rich exhaust gas flow for intensified regeneration
Data Source
AI summary
The invention relates to an exhaust gas conducting system for a gasoline engine, comprising an exhaust gas line which can be connected to an exhaust manifold of the gasoline engine, an inlet line which can be connected to an intake manifold of the gasoline engine, and a turbine which is arranged in the exhaust gas line. At least one exhaust gas recirculation line is provided which opens into the inlet line, and the exhaust gas line has a bypass line which opens into the exhaust gas line downstream of the turbine, wherein a) the exhaust gas recirculation line branches off upstream of the turbine, and the bypass line branches off to the exhaust gas recirculation line or b) the bypass line branches off upstream of the turbine, and the exhaust gas recirculation line branches off to the bypass line, wherein c) at least one particle filter is arranged in the exhaust gas recirculation line or in the bypass line upstream of the exhaust gas recirculation line or in the exhaust gas line upstream of the exhaust gas recirculation line.