Piston Jet Splitter Contour for Combustion Air Utilization
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Solution Overview
Problem
Existing internal combustion engine combustion methods do not optimize the utilization of combustion air in the combustion chamber, leading to inefficient combustion and increased soot emissions.
Innovation Solution
The method involves using first and second deflection means in the piston stage to distribute injection jets into third subsets, and injecting first and second injection jets with different jet breakups to form four combustion fronts, optimizing the distribution and utilization of combustion air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If injection jets are directed towards the piston crown and cylinder wall, then fuel delivery is simplified, but combustion efficiency decreases and soot emissions increase due to poor utilization of combustion air
Solution Approach 1:
The injection jet is segmented into multiple subsets (first subset forming first combustion front, second subset forming second combustion front, third subsets forming third combustion front) by the jet splitter contour on the piston crown. This segmentation allows different portions of the fuel to be directed towards different regions (piston hollow, combustion chamber roof, gaps between injection jets) to optimize combustion air utilization while maintaining a relatively simple fuel delivery system.
Solution Approach 2:
The patent utilizes the third dimension (vertical direction from piston crown) to distribute fuel subsets. The jet splitter contour directs fuel not only radially but also vertically towards the combustion chamber roof and piston hollow, creating multiple combustion fronts at different spatial levels. This dimensional approach maximizes combustion air utilization throughout the combustion chamber volume.
2Productivity
If injection pressure and duration are increased to improve fuel atomization, then combustion efficiency improves, but fuel consumption increases and soot formation worsens
Solution Approach 1:
Different subsets of the injection jet are directed to different regions with different local requirements. The first subset enters the piston hollow where combustion air is abundant, the second subset forms a combustion front between the piston crown and combustion chamber roof, and the third subsets are directed into gaps between adjacent injection jets. This local optimization ensures efficient combustion of each fuel portion without requiring excessive overall injection pressure or duration.
Solution Approach 2:
The patent changes the spatial distribution parameters of the injection jet by using the jet splitter contour to create multiple subsets with different trajectories and target regions. This parameter change in fuel distribution allows for more efficient combustion air utilization, improving combustion efficiency while reducing the total fuel required and minimizing soot formation from incomplete combustion.
3Ease of manufacture
If the second subset impinges directly on the cylinder wall, then fuel delivery is simplified, but heat transfer losses increase and oil ablation worsens
Solution Approach 1:
The harmful direct impingement of the second subset on the cylinder wall is eliminated by extracting and redirecting this fuel portion. The jet splitter contour on the piston crown redirects the second subset towards the combustion chamber roof and piston hollow region, where it forms a controlled combustion front. This extraction of the problematic fuel portion prevents unwanted heat transfer to the cylinder wall and reduces oil ablation while maintaining a relatively simple fuel delivery system.
4Ease of manufacture
If multiple injection jets are injected simultaneously in a star shape, then fuel distribution is improved, but combustion air utilization becomes inefficient and soot emissions increase
Solution Approach 1:
Each of the multiple simultaneous injection jets is segmented by the jet splitter contour on the piston crown into first, second, and third subsets. This segmentation creates multiple combustion fronts (first, second, and third combustion fronts) that are spatially distributed throughout the combustion chamber. The segmentation ensures that combustion air is utilized efficiently in different regions simultaneously, maintaining uniform fuel distribution while improving combustion air utilization and reducing soot emissions.
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 approach enhances combustion efficiency, reduces soot emissions, and minimizes unwanted heat transfer and oil ablation, resulting in a more fuel-efficient and cleaner engine operation.
Implementation Method 1
the injection jets are respectively divided into a first subset entering into the piston hollow, into a second subset entering via the piston stage into a region between the piston crown and the combustion chamber roof and into third subsets
Implementation Method 2
By means of a resulting current in the combustion chamber formed at least from a swirl, a crushing gap current and a jet current, the injection jets are deflected up-jet or upstream of the jet splitter contour in the direction of the piston
Implementation Method 3
a crushing gap current and a jet current
Implementation Method 4
a crushing gap current and a jet current
Implementation Method 5
The method is a burning method, also referred to as a combustion method, according to which the internal combustion engine is operated in its fired operation
Implementation Method 6
The combustion chamber is delimited in the axial direction of the cylinder on one side by a piston received translationally moveably in the cylinder
Data Source
AI summary
A method for operating an internal combustion engine of a motor vehicle having a cylinder, the combustion chamber of which is delimited in the radial direction by a cylinder wall and in the axial direction by a piston and by a combustion chamber roof. The piston has an annularly peripheral piston stage which is arranged axially recessed in the piston compared with an annularly peripheral piston crown and which merges via an annularly jet splitter contour into a piston hollow arranged axially recessed in the piston in relation to the piston stage. An injector is allocated to the cylinder and via the injector several injection jets are simultaneously injected directly into the combustion chamber in a star shape for a combustion process.