EGR Device Passage Portion Fresh Air Mixing
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Solution Overview
Problem
Existing EGR devices face issues with fresh air mixing into the EGR gas, leading to a dilution of the exhaust gas recirculation, which affects the amount of EGR gas available for recirculation.
Innovation Solution
The EGR device incorporates a passage portion with a main passage and expansion chambers that guide the EGR gas flow, minimizing the mixing of fresh air by using bilaterally symmetrical diverting passages and expansion chambers to direct and disperse the fresh air away from the EGR gas flow, ensuring a sufficient amount of EGR gas is maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If outlet portions are connected to different branch passage portions, then EGR gas can be distributed to multiple branches, but fresh air flows backward from other branch passage portions and mixes with EGR gas, diluting the EGR gas
Solution Approach 1:
The passage portion acts as an intermediary component between the inlet portion and outlet portions. It includes a first passage and a second passage that are positioned adjacently, with the first passage extending in a first direction and the second passage extending in a second direction different from the first direction. This intermediary structure directs fresh air away from the EGR gas flow path, preventing mixing while maintaining distribution to multiple branches.
Solution Approach 2:
The passage portion utilizes spatial dimensionality by arranging the first and second passages in different directions (first direction and second direction different from the first direction). This dimensional arrangement allows the system to distribute EGR gas to multiple branch passage portions while simultaneously directing fresh air flow in different spatial dimensions to prevent mixing with the EGR gas.
2Stress or pressure
If fresh air flows backward from other branch passage portions, then intake vacuum is maintained in the system, but the fresh air mixes with EGR gas and changes the amount of EGR gas in the device
Solution Approach 1:
The passage portion serves as a mediator that allows intake vacuum to be maintained while preventing fresh air from mixing with EGR gas. The first and second passages are configured to direct fresh air flow away from the EGR gas path, acting as a protective barrier that maintains pressure differential without compromising EGR gas quantity.
Solution Approach 2:
The passage portion is segmented into a first passage and a second passage, each extending in different directions. This segmentation allows the system to handle different gas flows separately - the first passage manages EGR gas distribution while the second passage manages fresh air flow direction, preventing their mixing and maintaining EGR gas amount.
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 limits the mixing of fresh air into the EGR gas, ensuring a consistent and sufficient amount of EGR gas is recirculated, enhancing the performance of the EGR device.
Implementation Method 1
The expansion chamber is expanded outward from the connecting portion... The expansion chamber disperses the fresh air that has flowed backward from the second branch passage portion into a direction away from the EGR gas flow
Data Source
AI summary
An EGR device includes an inlet portion into which EGR gas is introduced, a first outlet portion, a second outlet portion, and a passage portion. The first outlet portion and the second outlet portion each conduct, to the corresponding branch passage portion, the EGR gas that has been introduced through the inlet portion. The passage portion allows gas to flow between the inlet portion and the first outlet portion and between the inlet portion and the second outlet portion. The passage portion includes: a main passage that connects the inlet portion to the first outlet portion and to the second outlet portion; and an expansion chamber that is expanded outward from the main passage. The main passage includes a connecting portion. The connecting portion is connected to the second outlet portion and extends in a first direction. The expansion chamber is expanded outward from the connecting portion.