Multi-zone Gaseous Fuel Injector for Engine Efficiency
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Solution Overview
Problem
Gaseous fuel internal combustion engines face challenges in balancing fuel efficiency, NOx emissions, and heat transfer to cylinder walls, particularly with hydrogen fuel, due to storage and cost barriers, requiring optimized fuel concentration and distribution strategies.
Innovation Solution
The engine design incorporates at least two spark plugs per cylinder with a gaseous fuel injector having nozzle clusters to direct fuel towards spark gaps, allowing for controlled injection timing and stratification, creating multiple semi-distinct combustion zones for improved efficiency and reduced NOx emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gaseous fuel is injected toward spark gap with nozzle clusters to create multiple combustion zones, then brake thermal efficiency and combustion stability are improved, but device complexity increases due to multiple spark plugs and clustered nozzles
Solution Approach 1:
The fuel injection system is segmented into multiple nozzle clusters, with each cluster containing multiple nozzles directed at specific spark plugs. This segmentation creates distinct fuel injection zones that enable multiple combustion zones, improving brake thermal efficiency by up to 5% while managing the complexity through functional division of the injection system
Solution Approach 2:
Different nozzle clusters are positioned to deliver fuel with specific local characteristics to different spark plugs within the cylinder. This local quality approach creates semi-distinct combustion zones with optimized fuel-air mixing at each location, enhancing combustion stability and efficiency while maintaining controlled system complexity
2Productivity
If fuel injection timing is advanced to improve efficiency, then brake thermal efficiency increases, but NOx emissions increase due to higher combustion temperatures
Solution Approach 1:
The combustion process is segmented into multiple zones through clustered nozzle arrangements, allowing different portions of the fuel charge to burn at different rates and temperatures. This segmentation enables advanced injection timing for efficiency while the distributed combustion zones prevent excessive peak temperatures that generate NOx emissions
Solution Approach 2:
The system changes the spatial distribution parameters of fuel injection through clustered nozzles, creating multiple combustion zones with different local equivalence ratios. This parameter change allows the engine to operate with advanced injection timing while maintaining lower overall combustion temperatures, reducing NOx emissions while preserving brake thermal efficiency gains
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 enhances brake thermal efficiency by up to 5% and improves combustion stability, reducing NOx emissions and fuel consumption while decreasing burn time, achieving better engine performance across the operating range.
Implementation Method 1
a gaseous fuel injector extending into each cylinder and having at least one nozzle cluster containing one or more nozzles positioned to direct gaseous fuel only toward a spark gap of an associated spark plug
Implementation Method 2
at least one spark plug per cylinder... initiate combustion
Implementation Method 3
An engine having cylinders capable of combusting gaseous fuel
Data Source
AI summary
An engine having cylinders capable of combusting gaseous fuel includes at least one spark plug per cylinder, a gaseous fuel injector extending into each cylinder and having at least one nozzle cluster containing a one or more nozzles positioned to direct gaseous fuel only toward a spark gap of an associated spark plug, and a control system operating each spark plug and each injector to deliver gaseous fuel directly to the cylinder and initiate combustion. A method for controlling an engine capable of operating with gaseous fuel includes injecting the gaseous fuel directly into each cylinder through a centrally located injector having a plurality of clusters of nozzles, each cluster associated with one of at least two spark plugs positioned closer to a cylinder wall than to the injector, each cluster directing the gaseous fuel toward an associated spark plug gap.