EGR Cooler Baffle and Port Heating for Fouling
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Solution Overview
Problem
Exhaust gas recirculation (EGR) cooler systems in engines suffer from fouling due to particulate matter accumulation, leading to increased gas flow resistance, decreased cooling effectiveness, and higher emissions, with existing cleaning methods being inefficient and leaving unsightly residues.
Innovation Solution
An EGR cooler design with a baffle system directing exhaust gas through cooling tubes in a defined path and a controller-initiated cleaning mode based on fouling levels, using port heating and alternative methods to remove deposits and maintain system effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If exhaust gas is recirculated through the EGR cooler, then emissions are reduced and combustion efficiency is improved, but fouling occurs due to particulate matter accumulation leading to increased pressure drop and decreased cooling effectiveness
Solution Approach 1:
The patent converts the harmful effect of unburned oil and particulate matter into a beneficial cleaning mechanism by introducing a port heating mode that deliberately burns off deposits. The harmful fouling materials are oxidized and vaporized through controlled overheating, transforming them from contaminants into a self-cleaning process that removes积碳 and restores EGR cooler effectiveness.
Solution Approach 2:
The system changes the thermal parameter of the EGR cooler by switching between normal cooling operation and port heating mode. During port heating, the temperature parameter is deliberately increased to burn off deposits, while during normal operation, the cooler functions at lower temperatures for efficient exhaust gas cooling. This parameter switching resolves the contradiction between maintaining cooling effectiveness and preventing fouling.
2Object-affected harmful factors
If port heating is used to clean the EGR cooler, then fouling is reduced, but unsightly residue may be deposited on the exterior of the equipment and vehicle
Solution Approach 1:
The patent extracts the harmful residue formation from the EGR cooler interior by directing the port heating process to occur specifically within the cooler passages where deposits accumulate. The heating zone is localized to the EGR cooler internal flow paths, separating the cleaning function from the exterior surfaces, thus preventing residue deposition on external equipment and vehicle surfaces while still achieving fouling removal inside the cooler.
3Device complexity
If the EGR cooler operates continuously without cleaning, then system simplicity is maintained, but fouling accumulates leading to increased emissions and decreased fuel efficiency
Solution Approach 1:
The EGR cooler is designed with multi-functionality by integrating both cooling and self-cleaning capabilities into a single component. The same EGR cooler structure performs dual functions: cooling exhaust gas during normal operation and serving as a combustion chamber for burning off deposits during port heating mode. This eliminates the need for separate cleaning systems while maintaining reliable performance, resolving the contradiction between device simplicity and effective fouling prevention.
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
The baffle system reduces thermal stress on cooling tubes, and the controller-activated cleaning modes effectively prevent fouling, maintaining EGR cooler efficiency and reducing emissions, while minimizing residue formation.
Implementation Method 1
a baffle positioned proximate to the exhaust gas inlet and interposed between the plurality of cooling tubes and the exhaust gas inlet. The baffle is configured to direct exhaust gas entering the EGR cooler through the exhaust gas inlet to the plurality of cooling tubes in a defined path.
Implementation Method 2
a plurality of cooling tubes disposed between the exhaust gas inlet and exhaust gas outlet
Implementation Method 3
The EGR cooler may be used to reduce exhaust gas temperature from about 1000 degrees Fahrenheit to about 200 degrees Fahrenheit.
Implementation Method 4
Port heating is an operating mode that reduces an amount of (i.e. oxidizes and/or vaporizes) liquid oil that may be present (fouling) an exhaust system.
Implementation Method 5
Port heating is an operating mode that reduces an amount of (i.e. oxidizes and/or vaporizes) liquid oil that may be present (fouling) an exhaust system.
Implementation Method 6
Some EGR systems may include an EGR cooler to reduce a temperature of the recirculated exhaust gas before it enters the intake passage.
Data Source
AI summary
Various methods and systems are provided for an exhaust gas recirculation system. In one example, an exhaust gas recirculation cooler includes an exhaust gas inlet and an exhaust gas outlet spaced from the exhaust gas inlet; a plurality of cooling tubes disposed between the exhaust gas inlet and exhaust gas outlet; and a baffle positioned proximate to the exhaust gas inlet and interposed between the plurality of cooling tubes and the exhaust gas inlet, where the baffle directs exhaust gas entering the EGR cooler through the exhaust gas inlet to the plurality of cooling tubes in a defined path.