Intake Manifold EGR Gas Guide Portion for Cylinder Distribution
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Solution Overview
Problem
Conventional intake manifolds for multicylinder engines result in inhomogeneous distribution of Exhaust Gas Recovery (EGR) gas within the intake air and across cylinders due to the air curtain effect, leading to insufficient NOx reduction and performance issues.
Innovation Solution
The intake manifold design includes an EGR gas guide portion with upstream and downstream release ports within the intake air introducing sleeve, ensuring EGR gas is evenly distributed across the central portion of the sleeve, facilitating homogeneous distribution into all cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If EGR gas is introduced into the intake air introducing sleeve portion from a single passage outlet, then the structure is simple, but the concentration distribution of EGR gas in the intake air becomes inhomogeneous
Solution Approach 1:
The EGR gas release function is segmented into multiple release ports (upstream and downstream) positioned at different locations within the intake air introducing sleeve portion. This segmentation allows EGR gas to be released at multiple points, creating a more uniform concentration distribution throughout the intake air across all cylinders.
Solution Approach 2:
The EGR gas release is extended from a single-point release to a multi-dimensional distribution system. By positioning release ports at both upstream and downstream locations within the sleeve portion, the system achieves three-dimensional distribution of EGR gas throughout the intake air flow path, ensuring homogeneous mixing.
2Device complexity
If EGR gas is introduced from a single passage outlet, then the device structure is simple, but the distribution of EGR gas into respective cylinders becomes inhomogeneous
Solution Approach 1:
The EGR gas release function is segmented into multiple release ports (upstream and downstream) positioned at different locations within the intake air introducing sleeve portion. This segmentation allows EGR gas to be released at multiple points, creating a more uniform concentration distribution throughout the intake air across all cylinders.
Solution Approach 2:
Different regions of the intake air introducing sleeve portion are provided with EGR gas release ports according to their specific needs. The upstream and downstream ports are strategically positioned to address local distribution requirements of different cylinders, ensuring each cylinder receives appropriate EGR gas concentration.
3Device complexity
If the intake air passing through the intake air introducing sleeve portion functions as an air curtain, then the structure is simple, but the EGR gas is less likely to be distributed into cylinders on the far side
Solution Approach 1:
The EGR gas release is extended from a single-point release to a multi-dimensional distribution system. By positioning release ports at both upstream and downstream locations within the sleeve portion, the system achieves three-dimensional distribution of EGR gas throughout the intake air flow path, ensuring homogeneous mixing.
Solution Approach 2:
The EGR gas release function is segmented into multiple release ports (upstream and downstream) positioned at different locations within the intake air introducing sleeve portion. This segmentation allows EGR gas to be released at multiple points, creating a more uniform concentration distribution throughout the intake air across all cylinders.
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 achieves homogeneous EGR gas distribution within the intake air and across cylinders, enhancing NOx reduction and engine performance by ensuring uniform EGR gas delivery to all cylinders.
Implementation Method 1
The EGR gas is likely to be diffused into front and back parts of the intake air passing through the central portion of the intake air introducing sleeve portion and the concentration distribution of the EGR gas in the intake air is likely to become homogeneous.
Data Source
AI summary
There is provided an intake manifold of a multicylinder engine capable of facilitating homogenization of concentration distribution of EGR gas in intake air and distribution of EGR gas into respective cylinders. The intake manifold is configured such that an EGR gas guide portion is provided in an intake air introducing sleeve portion, the EGR gas guide portion includes an upstream EGR gas release port and a downstream EGR gas release port, the upstream EGR gas release port is provided on a side of a passage outlet of an EGR gas introducing passage, the downstream EGR gas release port is provided on an opposite side of a central portion of the intake air introducing sleeve portion from the upstream EGR gas release port, and the EGR gas introduced from the passage outlet of the EGR gas introducing passage into the intake air introducing sleeve portion is released from both of the upstream EGR gas release port and the downstream EGR gas release port into intake air passing through the central portion of the intake air introducing sleeve portion.