EGR System Particle Filter Bypass Line Regeneration
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Solution Overview
Problem
Gasoline engines face challenges in exhaust gas recirculation due to low oxygen levels and high intake temperatures, leading to incomplete combustion and particle filter clogging, which hampers efficient regeneration and increases pollutant emissions.
Innovation Solution
A bypass line is introduced downstream of the particle filter, allowing for independent control of exhaust gas flow and oxygen-rich exhaust gas recirculation, enabling continuous regeneration of the particle filter even when the EGR valve is closed, and utilizing a cooler to maintain high exhaust gas temperatures for effective regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If exhaust gas recirculation is implemented in gasoline engines, then combustion efficiency is improved, but particle filter clogging increases due to low oxygen levels
Solution Approach 1:
The exhaust system is segmented into two separate paths: an EGR line for exhaust gas recirculation and a bypass line for oxygen-rich exhaust gas. This segmentation allows the particle filter to receive oxygen from the bypass line independently of the EGR valve status, preventing clogging while maintaining combustion efficiency benefits from EGR.
Solution Approach 2:
The bypass line acts as an intermediary that supplies oxygen-rich exhaust gas to the particle filter. This intermediary path ensures that the particle filter receives sufficient oxygen for regeneration even when the EGR valve is closed, resolving the contradiction between EGR benefits and filter clogging risks.
2Reliability
If EGR valve is closed to prevent clogging, then particle filter regeneration is improved, but intake temperature increases
Solution Approach 1:
The exhaust system is divided into separate functional paths: the EGR line for temperature control and the bypass line for oxygen supply to the particle filter. This allows the EGR valve to remain closed for filter regeneration while the bypass line continues to provide oxygen-rich exhaust gas, preventing intake temperature increase.
Solution Approach 2:
The bypass line serves multiple functions: it provides oxygen-rich exhaust gas to the particle filter for regeneration, maintains appropriate intake temperatures, and enables continuous filter operation independent of EGR valve position. This multi-functionality resolves the contradiction between filter regeneration and temperature control.
3Reliability
If bypass line is opened for oxygen supply, then particle filter regeneration is enhanced, but exhaust gas flow control complexity increases
Solution Approach 1:
The bypass throttle valve provides dynamic control of the bypass line, allowing the system to adjust oxygen supply to the particle filter based on operating conditions. This dynamic control mechanism enhances filter regeneration while maintaining manageable system complexity through a single adjustable parameter.
Solution Approach 2:
The system incorporates feedback control where the bypass throttle valve is regulated based on particle filter oxygen requirements and engine operating conditions. This feedback mechanism optimizes regeneration effectiveness while preventing excessive complexity by using standard control loops.
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 enhances particle filter regeneration, reduces pollutant emissions, and improves engine efficiency by maintaining high exhaust gas temperatures and reducing the risk of clogging, allowing for longer regeneration phases and improved combustion.
Implementation Method 1
A particulate filter is provided at the exhaust outlet or exhaust pipe
Implementation Method 2
the particulate mass retained up to that point (soot particles with attached or embedded hydrocarbons) combusts under normal gasoline engine operating conditions, essentially to CO2 or H2O
Implementation Method 3
Sufficiently high exhaust gas temperatures of more than 500 °C and oxygen for combustion are required for this
Implementation Method 4
EP 2 194 351 B1 describes an exhaust gas cooler for a diesel engine
Data Source
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AI summary
The invention relates to an exhaust gas conducting system (1) for a gasoline engine (2), comprising an exhaust gas line (2.3) which can be connected to an exhaust manifold (2.1) of the gasoline engine (2), an inlet line (2.4) which can be connected to an intake manifold (2.2) of the gasoline engine (2), and a turbine (3) which is arranged in the exhaust gas line (2.3). At least one exhaust gas recirculation line (1.1a, 1.1c) is provided which opens into the inlet line (2.4), and the exhaust gas line (2.3) has a bypass line (1.1b) which opens into the exhaust gas line (2.3) downstream of the turbine (3), wherein a) the exhaust gas recirculation line (1.1a) branches off upstream of the turbine (3), and the bypass line (1.1b) branches off to the exhaust gas recirculation line (1.1a) or b) the bypass line (1.1b) branches off upstream of the turbine (3), and the exhaust gas recirculation line (1.1a) branches off to the bypass line (1.1b), wherein c) at least one particle filter (1.1, 1.2x) is arranged in the exhaust gas recirculation line (1.1a) or in the bypass line (1.1b) upstream of the exhaust gas recirculation line (1.1a) or in the exhaust gas line (2.3) upstream of the exhaust gas recirculation line (1.1a).