EGR Passage Vertical Guide Prevents Purifier Corrosion
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Solution Overview
Problem
In engine intake and exhaust systems with EGR systems, condensed water from the EGR cooler can accumulate in the exhaust gas purifier, leading to corrosion, especially when the exhaust emission control system is disposed laterally, as it can flow back into the system and accumulate, causing issues with engine layout in vehicles like FF-type vehicles.
Innovation Solution
The EGR passage is designed with a branch and guide configuration where the EGR cooler is positioned vertically, guiding the exhaust gas upward, and the condensed water is swiftly introduced into the exhaust passage, preventing backflow into the exhaust gas purifier by aligning with the horizontal exhaust gas flow, ensuring the condensed water joins the exhaust gas flow and is directed downstream, thus preventing accumulation in the purifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the exhaust emission control system is disposed laterally on the side of the engine body, then the engine layout flexibility is improved, but condensed water can enter and accumulate in the exhaust emission control system causing corrosion
Solution Approach 1:
The EGR passage is configured to extend in the up-and-down direction (vertical dimension) rather than horizontally, connecting the exhaust passage below to the intake passage above. This vertical arrangement ensures that condensed water flows downward due to gravity and cannot backflow into the laterally disposed exhaust emission control system, thus preventing corrosion while maintaining layout flexibility
Solution Approach 2:
The EGR passage is designed with proper grading and slope in the vertical direction, creating a gravitational flow path that directs condensed water toward the exhaust passage outlet away from the exhaust emission control system. This equipotential design ensures water naturally drains without accumulation, preventing corrosion issues
2Object-affected harmful factors
If the EGR passage extends vertically with EGR cooler and valve, then the condensed water can be controlled and prevented from entering exhaust emission control system, but the system complexity increases
Solution Approach 1:
The EGR passage integrates multiple functions into a single vertical structure: exhaust gas cooling (via EGR cooler), flow direction control (via vertical extension and grading), and water drainage (via gravitational flow path). By combining these functions in one integrated passage rather than separate components, the design achieves effective condensed water control without proportionally increasing system complexity
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 effectively prevents condensed water from accumulating in the exhaust gas purifier, reducing the risk of corrosion and ensuring smooth engine operation by ensuring the condensed water is swiftly introduced into the exhaust passage, maintaining a strong exhaust gas flow that prevents backflow and corrosion.
Implementation Method 1
the condensed water generated at an EGR cooler
Implementation Method 2
the guide part is configured to guide the exhaust gas from the branch to the exhaust side of the engine as well as downward when mounted in the vehicle
Data Source
Figure 1
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AI summary
An intake and exhaust system of an engine (2) mounted on a vehicle is provided, which includes an intake passage (20) and an exhaust passage (30), and an exhaust gas recirculation (EGR) passage (51) configured to introduce a portion of exhaust gas to the intake passage as EGR gas. The exhaust passage includes an exhaust gas purifier (32) including an inlet part (321) and an outlet part (322) for the exhaust gas, that is disposed so that the exhaust gas flows horizontally, a branch (323) connected to the outlet part and configured to branch in vehicle up-and-down directions a channel of the exhaust gas after being purified by the exhaust gas purifier, and a guide (324) connected to the branch and configured to guide the exhaust gas below the outlet part (322). The EGR passage (51) is connected to the branch and guides the EGR gas upward.