Fuel Injector Plume Geometry for Combustion Efficiency
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Solution Overview
Problem
In spark ignited direct injection engines, existing fuel injection systems fail to maintain fuel plume integrity and targeted fuel delivery within the cylinder bore during the intake stroke, leading to inefficient combustion and soot buildup on intake valves.
Innovation Solution
A spark ignited direct injection fuel system with a fuel injector that provides a conical fuel flow pattern with specific angular spans and velocities, maintaining at least 30% of the fuel volume within the plume as it extends into the cylinder bore, ensuring targeted delivery and minimizing fuel diffusion towards the intake valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional fuel injection systems are used, then the fuel is injected into the cylinder bore, but the fuel plume loses integrity and diffuses towards the intake valve during the intake stroke
Solution Approach 1:
The fuel injection system employs different injection strategies for different regions of the combustion chamber. The fuel plume is directed to impact the piston surface at specific locations and angles, creating localized high-concentration fuel zones on the piston while preventing fuel accumulation in other regions, particularly near the intake valve. This local quality approach ensures optimal combustion conditions at the piston while avoiding harmful fuel diffusion toward the intake valve.
Solution Approach 2:
Fuel injection begins before the piston reaches the bottom of the intake stroke, with the fuel plume pre-positioned to impact the piston surface at optimal locations. The injection timing and plume direction are predetermined to ensure that when the piston is at 50% or more of the intake stroke, the fuel has already been deposited in the desired locations, preventing subsequent diffusion toward the intake valve.
2Productivity
If fuel is injected directly into the cylinder bore, then combustion can occur, but soot buildup occurs on intake valves due to fuel diffusion
Solution Approach 1:
The fuel injection system creates localized fuel concentration zones on the piston surface while deliberately avoiding fuel deposition in the intake valve region. By controlling plume direction, angle, and impact location, the system ensures that fuel is concentrated where it is needed for combustion (on the piston) while preventing fuel from reaching the intake valve, thereby eliminating soot buildup without compromising combustion efficiency.
Solution Approach 2:
The system converts the potential harm of fuel diffusion into a benefit by strategically directing the fuel plume to impact the piston surface at specific angles and locations. This controlled impact creates efficient combustion zones on the piston while the same directional control prevents fuel from reaching the intake valve, transforming what would normally be harmful diffusion into a beneficial targeted delivery mechanism.
3Quantity of substance
If the fuel plume extends further into the cylinder bore, then more fuel can be delivered to the piston, but fuel volume within the angular span decreases
Solution Approach 1:
The system optimizes multiple parameters simultaneously: plume extension distance, angular span, fuel flow rate, and injection timing. By coordinating these parameters, the system achieves both extended plume reach to deliver sufficient fuel to the piston and maintains adequate fuel volume within the angular span to ensure proper combustion, resolving the contradiction between quantity and concentration.
Data Source
AI summary
An engine assembly may include an engine block defining a cylinder bore, a piston disposed within the bore, and a spark ignited direct injection fuel system. The piston may be disposed within the bore at a position corresponding to at least 50 percent of an intake stroke of the piston. The piston and the cylinder bore may partially define a combustion chamber. The spark ignited direct injection fuel system may include a fuel injector that provides a fuel flow to the combustion chamber during the intake stroke. The fuel flow may include a plume having an angular span. The plume may have a fuel volume associated therewith and may maintain at least 30 percent of the fuel volume within the angular span. The plume may extend into the cylinder bore a distance corresponding to the piston position.