Intake Manifold Guide Wall for Uniform EGR Gas Distribution
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Solution Overview
Problem
Existing intake manifold structures for internal combustion engines fail to evenly distribute EGR gas and blow-by gas among different cylinders, leading to inefficient engine operation.
Innovation Solution
The intake manifold structure includes additional gas introduction ports and passages with a guide wall that forms a surge tank and downstream chamber to evenly distribute additional gases, ensuring uniform flow distribution across branch passages without complicating the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If EGR passages and blow-by gas passages extend across branch passages with inlets at either end, then the structure is simple, but the distances from inlets to outlets vary causing uneven gas distribution
Solution Approach 1:
The intake manifold is divided into multiple independent passages (first EGR passage, second EGR passage, first blow-by gas passage, second blow-by gas passage) with standardized configurations. Each passage has its inlet and outlet positioned at consistent locations, segmenting the gas distribution system into uniform units that ensure even distribution while maintaining structural simplicity.
2Manufacturing precision
If additional gas introduction ports are added to each branch passage, then gas distribution can be improved, but the structure becomes more complex
Solution Approach 1:
The additional gas introduction ports serve multiple functions: they introduce EGR gas, blow-by gas, or a mixture of both gases into the branch passages. This multi-functional design improves gas distribution uniformity without requiring separate systems for different gas types, thereby avoiding increased structural complexity.
3Reliability
If inlet chamber is formed to suppress gas pulsation, then engine operation smoothness improves, but the structure becomes more complex
Solution Approach 1:
The inlet chamber is integrated into the existing intake manifold structure by forming it as an extension of the plenum chamber. This merging of functions allows the inlet chamber to suppress gas pulsation and improve engine operation smoothness while sharing structural space with the plenum chamber, thereby minimizing additional 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 design ensures even distribution of EGR and blow-by gases among cylinders, enhancing the smooth operation of internal combustion engines by minimizing gas pulsation and maintaining a compact engine profile.
Implementation Method 1
an inlet chamber (34A) directly communicating with the additional gas inlet and having a certain volume is defined by the guide wall in cooperation with an outer wall of the additional gas introduction passage forming member. The inlet chamber serves as a surge tank for suppressing the pulsation of the additional gas flow
Data Source
AI summary
Provided is an intake manifold structure for an internal combustion engine including an intake manifold defining a plurality of branch passages (13) communicating with corresponding intake ports (6) of the internal combustion engine (1) arranged in a cylinder row direction thereof, and provided with additional gas introduction ports (29) communicating with the respective branch passages, and an additional gas introduction passage forming member (16) attached to the intake manifold, and defining an additional gas inlet (35) and additional gas introduction passages (14) communicating the additional gas inlet with the corresponding additional gas introduction ports, wherein the additional gas introduction passage forming member extends across the branch passages, and is provided with a guide wall (33) for defining the additional gas introduction passages in cooperation with an outer surface of the intake manifold and an inner surface of the additional gas introduction passage forming member.