Compound Angle Fuel Injector Mounting for Opposed-Piston Engines
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Solution Overview
Problem
In opposed-piston engines with ported cylinders, it is impractical to position fuel injectors for diametrically opposing alignment due to physical constraints, limiting the compactness of the engine and hindering uniform fuel-to-air mixing, which affects emissions and efficiency.
Innovation Solution
The fuel injectors are mounted at compound angles relative to the cylinder, allowing for direct side injection of opposing spray patterns that meet at the center of the combustion chamber, reducing inter-cylinder spacing while maintaining engine compactness and promoting uniform air-fuel mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fuel injectors are positioned for diametrically opposing alignment, then uniform fuel-to-air mixing is improved, but engine compactness deteriorates due to increased inter-cylinder spacing requirements
Solution Approach 1:
The patent applies dimensionality change by mounting fuel injectors at compound angles (tilted relative to both the cylinder bore axis and the horizontal plane) rather than conventional aligned or purely horizontal positions. This three-dimensional arrangement allows opposing spray patterns to meet at the combustion chamber center while reducing the horizontal space required between cylinders, thus improving mixing uniformity without sacrificing engine compactness.
Solution Approach 2:
The patent employs asymmetry by using non-standard injector orientations where the injector axes are tilted at specific angles relative to the cylinder bore and horizontal planes. This asymmetric positioning enables the spray patterns to be directed toward the combustion chamber center in a controlled manner, achieving uniform mixing while allowing closer cylinder spacing compared to symmetric diametrically opposed alignment.
2Volume of moving object
If fuel injectors are mounted at compound angles, then engine compactness is improved by reducing inter-cylinder spacing, but injector positioning complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the injector mounting structure with predetermined compound angle orientations. The injector supports are designed with built-in angular positioning features that automatically orient the injectors at the correct compound angles during assembly, eliminating the need for complex manual alignment procedures and reducing positioning complexity while maintaining engine compactness.
Solution Approach 2:
The patent uses an intermediary approach by introducing specialized injector support structures that mediate between the cylinder block and the fuel injectors. These support structures incorporate the compound angle geometry and positioning features, simplifying the overall system by centralizing the complexity in a dedicated component rather than requiring complex direct mounting arrangements.
Data Source
AI summary
An opposed-piston internal combustion engine with one or more ported cylinders and uniflow scavenging includes fuel injectors supported at compound angles with respect to the cylinders in order to directly inject spray patterns of fuel in opposing directions through the side walls of the cylinders.