Fuel Injection Insert Device with Gas Conduits
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Solution Overview
Problem
Compression ignition engines face challenges with premature ignition and soot production due to sub-optimal fuel-and-air mix ratios, which can degrade engine performance and increase emissions, and existing insert devices are prone to mechanical stress and misalignment issues.
Innovation Solution
The development of insert devices that mix fuel and air before injection into engine cylinders, using conduits and gas channels to control ignition delay and reduce soot formation, while being designed to withstand thermal stress and align properly with fuel injectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fuel is directly injected into compressed hot gases in compression ignition engines, then the fuel mixes with in-cylinder gases near the injection site, but the temperature remains elevated causing reduced ignition delay which leads to sub-optimal fuel-and-air mix ratio and soot production
Solution Approach 1:
The insert device pre-cools the fuel before injection by directing it through passages that expose it to cooler engine coolant, reducing the temperature of both fuel and injected mixture. This preliminary cooling action delays ignition timing and allows for better fuel-air mixing, reducing soot production while maintaining combustion efficiency
2Reliability
If insert devices are placed between fuel injectors and combustion chambers to mix fuel and air, then the fuel-and-air mix ratio is improved, but the devices are exposed to extreme temperatures causing mechanical stress due to different coefficients of thermal expansion
Solution Approach 1:
The insert device incorporates passages that allow engine coolant to flow through and cool the device body, actively changing its temperature parameter. This thermal management reduces the temperature differential between the insert device and cylinder head, minimizing thermal expansion differences and mechanical stress while maintaining reliable fuel-air mixing
3Ease of operation
If conduits in insert devices are positioned to receive fuel from fuel injectors, then fuel flow is enabled, but misalignment between conduits and fuel injector holes occurs due to small distances
Solution Approach 1:
The insert device includes alignment features such as locating pins or keyed interfaces that act as intermediaries between the fuel injector and insert device. These features ensure precise positioning of the conduits relative to the fuel injector holes, eliminating misalignment issues without requiring extremely tight manufacturing tolerances on the conduits themselves
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
These devices delay ignition, reduce soot production, and improve engine performance by ensuring a leaner fuel-and-air mix, while their design extends their lifespan and reduces maintenance costs by minimizing mechanical stress and misalignment issues.
Implementation Method 1
The mixture conduits can entrain the gas with the fuel into a fuel-and-gas mixture
Data Source
AI summary
An insert device may include a body coupled with an engine cylinder head. The body has an interior surface shaped to receive and engage a distal tip of a fuel injector. The body has gas conduits and mixture conduits with gas conduits extending from inlets along an exterior surface to outlets that intersect the mixture conduits. The mixture conduits extend from inlets along an interior surface of the body to outlets on the exterior surface. The gas conduits are positioned to direct gases outside of the body into the mixture conduits. The mixture conduits are positioned to receive fuel from spray holes of the fuel injector. The mixture conduits can entrain the gas with the fuel into a fuel-and-gas mixture that is directed out of the outlets of the mixture conduits and into a combustion chamber of an engine cylinder.