Four-Stroke Engine Fuel Injector Intake Port Integration
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Solution Overview
Problem
In direct-injection engines, the placement of fuel injectors between or below intake ports restricts the shape of the intake ports, increasing fluid resistance and obstructing air flow to the combustion chamber, which decreases air flow rate and the effectiveness of direct injection.
Innovation Solution
A four-stroke engine design where a fuel injector is at least partially disposed at the intake port and a housing hole, jetting a fuel mist directly into the combustion chamber, allowing for improved cooling and increased air flow without altering the intake port shape, thus reducing fluid resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fuel injector is disposed between the two intake ports, then the fuel injector can be positioned to supply fuel to the combustion chamber, but the shape or layout of the intake ports is restricted and fluid resistance increases
Solution Approach 1:
The fuel injector is repositioned from being disposed between or below the intake ports to being disposed at the intake port itself, utilizing a different spatial dimension. The injector is arranged to extend through the intake port wall, with its tip positioned in the intake port passage, thereby eliminating the need to restrict intake port shape or layout while still achieving effective fuel delivery to the combustion chamber.
2Ease of manufacture
If the fuel injector is disposed below the intake ports, then the fuel injector can be positioned to supply fuel to the combustion chamber, but the shape or layout of the intake ports is restricted
Solution Approach 1:
The fuel injector is repositioned from being disposed below the intake ports to being disposed at the intake port wall, utilizing a different spatial dimension. The injector extends through the intake port wall with its tip positioned in the intake port passage, thereby eliminating the need to restrict intake port shape or layout while still achieving effective fuel delivery to the combustion chamber.
Solution Approach 2:
The fuel injector is positioned locally at the intake port wall rather than in a fixed location below the ports. This localized positioning allows the intake port to maintain its optimal shape and layout for air flow, while the injector specifically targets fuel delivery at the point where it can most effectively mix with the incoming air charge.
3Ease of manufacture
If the intake port is greatly curved to accommodate the fuel injector, then the fuel injector space is ensured, but fluid resistance increases and air flow is obstructed
Solution Approach 1:
The fuel injector is extracted from the space between or below the intake ports and repositioned to extend through the intake port wall itself. This extraction eliminates the need to curve the intake port to accommodate the injector, as the injector now occupies a different spatial location that does not interfere with the optimal shape of the intake port passage.
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 enhances engine output and fuel efficiency by maintaining air flow while preventing knocking, and allows for a more flexible intake system layout.
Implementation Method 1
a fuel injector at least a portion of which is disposed at the intake port and at the housing hole and that supplies a mist of fuel directly to the combustion chamber by jetting the mist of fuel toward the combustion chamber
Implementation Method 2
the fuel mist (i.e., liquid droplets of fuel) jetted from the fuel injector is supplied directly to the combustion chamber. Therefore, the inside of the cylinder can be cooled by evaporating the fuel in the cylinder
Implementation Method 3
the temperature of the inside of the cylinder decreases, and therefore knocking can be prevented
Data Source
AI summary
A four-stroke engine includes a cylinder head in which a combustion chamber, an intake port that communicates with the combustion chamber, and a housing hole that passes through the combustion chamber and through the intake port are provided, and a fuel injector that supplies a mist of fuel directly to the combustion chamber by jetting the mist of fuel toward the combustion chamber. The fuel injector includes at least a portion that is disposed at the intake port and at the housing hole.