EGR Device Volume Distribution for Cylinder Subset
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Solution Overview
Problem
Existing EGR devices face challenges in evenly distributing exhaust gas recirculation (EGR) between cylinders due to varying explosion intervals, leading to uneven re-suction of backflow gas, which complicates the distribution of EGR gas and requires increased volumes of EGR chambers and introduction passages, resulting in larger sizes and increased heat release.
Innovation Solution
The EGR device is configured with volume differences in the EGR chamber and introduction passages based on the explosion intervals between cylinder subsets, with larger volumes for subsets with shorter intervals to reduce re-suction and equalize passage pressure loss, allowing for improved EGR gas distribution while minimizing the size of the EGR system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the volume of the EGR chamber and EGR introduction passage is increased to improve EGR gas distribution, then the distribution of EGR gas to each cylinder is improved, but the size of the EGR chamber and EGR introduction passage increases
Solution Approach 1:
The patent applies local quality by setting different volumes for different portions of the EGR chamber corresponding to different cylinder subsets. Specifically, the EGR chamber is divided into multiple portions, each associated with a specific cylinder subset, and each portion is configured with an appropriate volume to address the specific re-suction characteristics of that cylinder subset. This allows optimized EGR gas distribution without uniformly increasing the entire EGR chamber volume.
Solution Approach 2:
The EGR chamber is segmented into multiple portions, each associated with a specific cylinder subset. This segmentation allows independent volume optimization for each portion based on the specific explosion interval characteristics of the corresponding cylinder subset, preventing uniform volume increase while achieving targeted distribution improvement.
2Reliability
If the volume of the EGR chamber and EGR introduction passage is increased to reduce re-suction of backflow gas, then the re-suction is reduced, but the size of the EGR system increases
Solution Approach 1:
Different portions of the EGR chamber are configured with different volumes according to the specific re-suction characteristics of each cylinder subset. This local optimization reduces re-suction effectively without requiring a uniform increase in the entire EGR system volume.
3Stress or pressure
If the EGR chamber and EGR introduction passage are enlarged to equalize passage pressure loss, then the pressure loss equalization is improved, but the device complexity and size increase
Solution Approach 1:
The patent configures different volumes for different EGR chamber portions to locally compensate for pressure loss variations in different passage sections. This approach equalizes passage pressure loss across all cylinders without requiring a uniform enlargement of the entire EGR passage system.
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 enhances the distribution of EGR gas between cylinders, reduces the overall size of the EGR chamber and introduction passages, and minimizes heat release, effectively addressing the issues of uneven gas distribution and size increase.
Implementation Method 1
equalize passage pressure loss
Implementation Method 2
distribute the EGR gas introduced into the EGR passage to the plurality of EGR introduction passages
Data Source
AI summary
An EGR passage of an EGR device includes a plurality of EGR introduction passages and an EGR chamber. A plurality of cylinders include a first cylinder subset and a second cylinder subset, each of which is a pair of two cylinders positioned next to each other. An explosion interval between the two cylinders constituting the first cylinder subset is shorter than that of the second cylinder subset. A first total volume being the sum of volumes of two first EGR introduction passages associated with the first cylinder subset and a volume of a portion of the EGR chamber located between the two first EGR introduction passages is larger than a second total volume being the sum of volumes of two second EGR introduction passages associated with the second cylinder subset and a volume of a portion of the EGR chamber located between the two second EGR introduction passages.