Internal Combustion Engine Mask Parts with Localized Wall Height Variation
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Solution Overview
Problem
In internal combustion engines with fuel injectors positioned between intake openings, the mask parts along the outer edges of intake openings interfere with fuel sprays, leading to fuel inefficiency, poor exhaust emission, and unbalanced tumble flows due to either excessive reverse tumble or weakened normal tumble.
Innovation Solution
The engine design features mask parts with varying wall surface heights, where the first nozzle hole injection region has a lower height than other regions, and the fuel injector is positioned so that the center axis of the fuel spray passes between intake openings, minimizing interference and maintaining effective flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If wall surfaces of mask parts are provided along the entire outer edges of intake openings at opposite exhaust opening sides, then reverse tumble flow is prevented and normal tumble flow is strengthened, but fuel spray is interfered with and fuel deposits on mask parts
Solution Approach 1:
The mask part is designed with varying wall surface heights: a first wall surface along the outer edge of the intake opening has a first height, while a second wall surface in the fuel spray region has a second height lower than the first height. This local differentiation allows the mask part to maintain flow resistance function in non-spray regions while reducing interference with fuel spray in the second region, preventing fuel deposition.
2Loss of substance
If heights of wall surfaces of mask parts are made low overall or provided only around separated outer edges of intake openings, then fuel spray interference is reduced, but flow resistance against intake gas is weakened and reverse tumble flow is generated
Solution Approach 1:
The mask part employs differentiated wall surface heights in different regions: the first wall surface along the outer edge maintains a higher first height to provide sufficient flow resistance and prevent reverse tumble flow, while the second wall surface in the fuel spray region has a lower second height to minimize fuel interference. This local quality differentiation resolves the contradiction between maintaining tumble flow and preventing fuel deposition.
3Ease of manufacture
If fuel injector nozzle hole is positioned between two intake openings at opposite exhaust opening side, then fuel injection is simplified, but mask parts interfere with fuel spray and fuel efficiency deteriorates
Solution Approach 1:
The mask part is designed with a second wall surface in the fuel spray region having a lower second height to reduce interference with fuel injection while maintaining the simplified positioning of the fuel injector between the two intake openings. This local differentiation preserves the manufacturing simplicity while improving fuel efficiency by preventing fuel deposition on the mask part.
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 maintains a strong normal tumble flow while preventing fuel inefficiency and poor exhaust emission by reducing interference between fuel sprays and mask parts, thus optimizing fuel injection and combustion efficiency.
Implementation Method 1
fuel is injected so that the center axis of the fuel spray from the fuel injector passes between the two intake openings
Implementation Method 2
The wall surfaces of such mask parts function as flow resistances against part of the intake gas taken in from the intake ports into the combustion chamber
Data Source
AI summary
An internal combustion engine includes two intake openings, opened and closed by intake valves; exhaust openings opened and closed by exhaust valves; a fuel injector having a plurality of nozzle holes; and mask parts having wall surfaces extending along outer edges of the intake openings toward the inside of the combustion chamber. The fuel injector arranged wherein the nozzle holes are positioned at the opposite exhaust opening sides from the intake openings, and the plurality of nozzle holes include a first nozzle hole, injecting in a direction with the smallest angle from a plane perpendicular to the axial direction of the cylinder. The wall surface formed wherein a height in a first nozzle hole ejection region positioned in a range of injection of a fuel spray from the first nozzle hole, when viewed in the axial direction, is lower than a height in the first nozzle hole ejection region.