Fuel Injection Valve Mount Structure for Intake Port
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Solution Overview
Problem
Existing fuel injection systems for internal combustion engines face issues with uncombusted hydrocarbons (HC) in exhaust gas and degraded fuel consumption due to fuel adherence to intake port walls, leading to incomplete combustion and increased emissions.
Innovation Solution
A fuel injection valve mount structure is positioned to overlap with an imaginary plane perpendicular to the cylinder axis, ensuring the fuel injection occurs radially outward from the intake valve, reducing adherence to the intake port walls and enhancing atomization, thereby improving combustion efficiency and reducing uncombusted HC emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fuel injection valve is installed in the branch port away from the combustion chamber, then the fuel injection valve can be positioned to inject fuel into intake air flowing through the branch port, but the fuel may adhere to the wall surface which forms the branch port, leading to insufficient atomization and increased uncombusted HC emissions
Solution Approach 1:
The fuel injection valve is positioned at a specific location in the branch port where the wall surface is recessed relative to the center of the branch port. This local positioning ensures that fuel is injected away from the main flow path and does not adhere to the wall surface, while still effectively mixing with intake air. The recessed wall surface creates a localized zone that prevents fuel adhesion while maintaining injection functionality.
2Object-generated harmful factors
If the fuel injection valve is installed in each intake port, then fuel can be injected directly into intake air, but the flow quantity of intake air through the branch port is reduced, requiring reduction of fuel injection amount which does not suffice to increase engine output
Solution Approach 1:
The system divides the fuel injection function across multiple intake ports, with one fuel injection valve installed in each intake port. This segmentation allows fuel to be injected at multiple locations simultaneously, preventing adhesion to partition walls while maintaining sufficient total fuel flow quantity to support increased engine output. Each fuel injection valve serves a specific intake port, distributing fuel injection responsibilities across the system.
3Manufacturing precision
If the fuel injection valve is installed on the center axis of the intake valve, then the fuel injection valve can be positioned centrally, but the fuel mist is carried by intake air flow toward the inner peripheral wall where it readily adheres to the inner peripheral wall of the housing
Solution Approach 1:
The fuel injection valve is positioned asymmetrically relative to the intake valve center axis, specifically at a location where the wall surface is recessed. This asymmetric positioning causes fuel to be injected away from the center axis and prevents the fuel mist from being carried by intake air flow toward the inner peripheral wall. The recessed wall surface creates a geometric feature that redirects fuel flow away from adhesion-prone areas.
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 effectively limits fuel adherence to intake port walls, ensuring sufficient atomization and combustion, reducing uncombusted hydrocarbons in exhaust gas and improving fuel consumption.
Implementation Method 1
the fuel injected from the fuel injection valve adheres to the wall surface which forms the branch port... the fuel having adhered to the wall surface which forms the intake port flows into the combustion chamber without being sufficiently atomized
Implementation Method 2
the fuel injected from the fuel injection valve adheres to the wall surface which forms the branch port... allowing the fuel to be less adhered to the wall portion which provides a partition between the two branch ports
Data Source
AI summary
A combustion chamber side end portion of a fuel injection valve is placed at a location that overlaps with an imaginary plane, which is perpendicular to a center axis of a cylinder and extends along a portion of a wall surface of an intake port where an intake valve protrudes, or is projected out from the imaginary plane toward a combustion chamber. Alternatively, a center of a fuel injecting side end port of the fuel injection valve, which injects fuel into intake air that flows in a branch port branched from the intake port, may be placed on the center axis side of the intake valve in a radial direction of the cylinder. Further alternatively, an upstream side fuel injection valve may inject fuel into intake air that flows in the intake port, and a downstream side fuel injection valve may inject fuel into intake air that flows in the branch port branched from the intake port. Alternatively, an injection quantity of fuel may be controlled for each of fuel injection valves, which injects fuel into intake air that flows in the corresponding branch port branched from the intake port.