Pre-Chamber Nozzle Convergence for Engine Ignition
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Solution Overview
Problem
Spray nozzle-type pre-chambers in internal combustion engines result in incomplete combustion due to outlet jets not mixing thoroughly with the main chamber charge, leading to poor ignition because they create multiple small ignition sites instead of a single large ignition site.
Innovation Solution
A pre-chamber assembly with nozzles angled to converge at a single location within the piston bowl, ensuring that the output from each nozzle focuses at this point, enhancing ignition efficiency by directing the ignited charge towards the center of the main chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spray nozzle-type pre-chamber directs multiple outlet jets to different locations in main chamber, then combustion initiates at multiple sites, but combustion completeness deteriorates due to poor mixing with main chamber charge
Solution Approach 1:
The patent merges multiple outlet jets into a single convergence location within the piston bowl. Instead of directing jets to different locations, all nozzles are angled to converge at one point, combining their outputs to create a single large ignition site that ensures complete combustion while maintaining reliable ignition initiation.
2Reliability
If multiple nozzles are directed to different locations, then ignition occurs at multiple sites, but ignition efficiency deteriorates due to formation of small ignition sites instead of single large ignition site
Solution Approach 1:
Multiple nozzle outputs are merged at a single convergence location to form one large ignition site. This merging approach maintains the reliability of multi-point injection while improving ignition efficiency by creating a concentrated, large-scale ignition zone that enhances combustion performance.
Solution Approach 2:
The patent applies local quality by concentrating all nozzle outputs at a specific location within the piston bowl. This creates a localized region of high energy concentration and intense combustion, optimizing the ignition process at that specific spot while maintaining overall system reliability.
3Area of stationary object
If outlet jets are dispersed to different locations, then combustion initiates broadly, but mixing with main chamber charge deteriorates leading to incomplete combustion
Solution Approach 1:
The patent combines multiple dispersed jets into a single convergence point, creating one large ignition site with extensive coverage area. This merging approach ensures that the ignition coverage is sufficient while the concentrated energy at the convergence location promotes complete mixing and combustion of the charge.
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 configuration improves combustion efficiency by creating a consistent and intense high-energy ignition source, ensuring complete combustion of the charge within the main chamber by focusing the outlet jets at a predetermined location within the piston bowl.
Implementation Method 1
The plurality of nozzles are directed to one location. An output from each nozzle is configured to converge at the one location at a predetermined operation of the engine.
Implementation Method 2
Because there is lower turbulence of the air and/or fuel within the pre-chamber relative to the main chamber at the time of ignition
Data Source
AI summary
A pre-chamber assembly of an internal combustion engine comprises a pre-chamber housing and a plurality of nozzles extending through a portion of the pre-chamber housing. The plurality of nozzles are directed to one location.