Multi-Nozzle Fuel Injector Spray Pattern Design
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Solution Overview
Problem
Direct-Injection Spark-Ignition engines face challenges in reducing fuel impingement on surfaces, soot formation, and maintaining combustion stability, especially during cold start operations, which affect fuel efficiency and emissions control.
Innovation Solution
A fuel injector system with six nozzles arranged to direct fuel streams at specific radial distances and angles, minimizing impingement on surfaces like the piston, intake valves, and liner, while optimizing combustion emissions and fuel economy by reducing soot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If fuel is injected at conventional angles and distances, then combustion can be maintained, but fuel impingement on piston, valves, and liner occurs causing increased soot formation and reduced fuel efficiency
Solution Approach 1:
The fuel injection system is segmented into multiple nozzles (at least three nozzles) with distinct spray patterns. Each nozzle targets different regions of the combustion chamber - some nozzles spray toward the piston bowl while others spray across toward the exhaust valves. This segmentation allows fuel to be distributed in a controlled manner that avoids impingement on surfaces while maintaining combustion stability, thereby reducing soot formation without excessive complexity
Solution Approach 2:
Different nozzles are configured with local quality variations - specific nozzles are oriented to spray fuel in specific directions (toward piston bowl vs. toward exhaust valves) based on local combustion needs. This localized spray targeting ensures fuel is delivered precisely where needed for combustion while avoiding areas that would cause wetting and soot formation, resolving the contradiction between effective combustion and reduced harmful emissions
2Reliability
If fuel spray is directed to improve combustion stability during cold start, then emissions control improves, but fuel impingement on surfaces increases
Solution Approach 1:
The system dynamically adapts spray patterns for different operating conditions. During cold start operation, the multi-nozzle configuration provides enhanced combustion stability by directing fuel to regions that promote stable flame propagation. As the engine warms up, the same nozzle arrangement naturally reduces impingement as combustion becomes more stable and less fuel is required, thus achieving both combustion stability and reduced harmful factors through dynamic adaptation rather than static configuration
Solution Approach 2:
The nozzle system utilizes parameter changes in spray characteristics - by configuring nozzles with specific angles and orientations, the spray patterns change based on combustion chamber conditions. During cold start, the geometry of the nozzle arrangement promotes fuel-air mixing that enhances combustion stability. Under normal operating conditions, the same geometric parameters ensure fuel is atomized and distributed in a manner that minimizes surface impingement, thus resolving the contradiction through parameter-based adaptation
3Productivity
If multiple nozzles are added to optimize spray patterns, then fuel efficiency improves, but device complexity increases
Solution Approach 1:
The fuel injector is segmented into multiple nozzles (at least three) that can be integrated into a single injector body. This segmentation enables optimized spray patterns that improve fuel efficiency by ensuring complete combustion and reducing waste. The nozzles are arranged within a unified injector structure that manages the complexity, allowing each nozzle to serve a specific function (piston bowl targeting, exhaust valve targeting) while maintaining an integrated design that doesn't excessively increase device complexity
Solution Approach 2:
The multi-nozzle injector structure serves multiple functions simultaneously - it provides fuel injection for combustion, creates specific spray patterns for different combustion chamber regions, and adapts to different operating conditions (cold start vs. normal operation). This multi-functionality justifies the increased complexity by delivering proportional benefits in fuel efficiency, emissions control, and combustion stability, thus resolving the contradiction between improved productivity and increased device complexity
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
The arrangement of nozzles with precise radial and angular orientations reduces fuel impingement, enhances combustion stability, and decreases soot and smoke emissions, leading to improved fuel efficiency and reduced emissions.
Implementation Method 1
A fuel injector system with six nozzles arranged to direct fuel streams at specific radial distances and angles, minimizing impingement on surfaces like the piston, intake valves, and liner
Implementation Method 2
optimizing combustion emissions and fuel economy by reducing soot formation
Data Source
AI summary
A fuel injector having an injector axis, comprising a first nozzle aiming in a first radial direction; a first nozzle pair aiming in radial directions each equally angled relative to the first direction, closest to the first radial direction, and having a longest radial offset; a nozzle second pair in radial directions each equally angled relative to the first direction; and another nozzle aiming opposite the first radial direction and having a shortest radial offset.