Semi-Integrated Heat Exchanger with Segmented Intake Plenum
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Solution Overview
Problem
In internal combustion engines with indirect fuel or gas injection, backflows of air occur randomly in intake ducts due to the opening and closing of intake and exhaust ducts, leading to inefficiencies and space constraints in compact engine compartments.
Innovation Solution
An arrangement for fixing a heat exchanger to the intake wall of a cylinder head with a separating wall dividing the depression into cavities, and a fixing flange with orthogonal side walls to create isolated air flow paths for each combustion chamber, reducing backflows and optimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common intake plenum is used for all cylinders, then the device complexity is reduced and space is optimized, but backflows from multiple cylinders mix and cannot be isolated
Solution Approach 1:
The intake plenum is segmented into separate cavities, with each cavity serving a specific cylinder. The separating wall divides the plenum into first and second cavities, allowing independent airflow paths for each cylinder while maintaining a unified manifold structure. This segmentation enables backflow isolation without requiring completely separate intake systems for each cylinder.
2Temperature
If the heat exchanger is positioned to optimize cooling, then engine efficiency is improved, but the available space in the compact engine compartment is reduced
Solution Approach 1:
The heat exchanger is integrated directly into the intake manifold structure, merging the cooling function with the air distribution system. This combination allows the heat exchanger to utilize the existing plenum space and ductwork, providing effective intake air cooling without requiring additional separate components that would consume valuable engine compartment volume.
3Ease of manufacture
If a single large intake cavity is used, then the manufacturing process is simplified, but aerodynamic insulation between cylinders cannot be achieved
Solution Approach 1:
The intake plenum is divided into separate cavities by a separating wall, creating distinct airflow paths for each cylinder. This segmentation maintains manufacturing simplicity by using a single monoblock construction with internal partitions, while simultaneously achieving the aerodynamic insulation needed for optimized airflow efficiency and reduced cross-contamination between cylinder intakes.
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
The solution provides aeraulic insulation of each intake duct, minimizing backflows and enhancing engine efficiency by ensuring separate air flows for each combustion chamber, thus improving engine performance and compactness.
Implementation Method 1
This cooler stage comprises, for example, an air/water exchanger through which the hot compressed air gives up part of its heat to water or to a cooling liquid.
Implementation Method 2
the depression of the breech is divided into cavities by at least one separating wall resulting from material with the breech and extending from the depression surface towards the outside of the breech
Data Source
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AI summary
The invention relates to an arrangement for attaching an air intake circuit of an indirect fuel injection combustion engine, comprising a cylinder head (15) in which intake channels (17) have been hollowed out and which open on one side into a recess (20) of the intake wall (12) of the cylinder head and on the opposite side into a combustion chamber (16) defined by a cylinder, a piston and the lower wall of the cylinder head, the cylinder head comprising at least one injection duct per cylinder capable of housing a fuel injector and opening in an oblique manner in at least one intake channel (17), the admission circuit including a heat exchanger (11) attached to the intake wall of the piston head, characterised in that the recess (20) of the piston head is divided into cavities (19) by at least one separation wall (18) formed integrally with the piston head (15) and extending from the recess surface to the outside of the piston head, so that a combustion chamber (16) communicates with a unique cavity (19), and in that the heat exchanger is divided into longitudinal compartments, each compartment being connected with a unique cavity (19) of the piston head in the axial extension of the compartment.