Intake Port Fuel Biasing for Hydrogen Engine Ignition Control
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Solution Overview
Problem
Existing engine platforms face challenges in optimizing the mixing of gaseous hydrogen fuel with air for predictable ignition and avoiding undesired combustion forms, particularly in adapting traditional engine designs to hydrogen fuel.
Innovation Solution
A method and system for feeding pressurized air and gaseous fuel through intake ports in a biased distribution pattern, using varied fuel admission tubes with specific locations and angles relative to intake valve openings to create optimized flow streamlines for in-cylinder mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If gaseous fuel is admitted through conventional fuel injection systems, then fuel delivery is simplified, but in-cylinder mixing quality deteriorates leading to poor ignition predictability and undesired combustion forms
Solution Approach 1:
The fuel is injected into the intake port before the air-fuel mixture enters the cylinder, allowing preliminary mixing to occur in the intake port. The fuel injection timing is synchronized with the intake valve opening, enabling the fuel to be distributed along the intake port walls and mixed with incoming air before cylinder entry, thus improving mixing quality without requiring complex in-cylinder injection systems
Solution Approach 2:
The invention creates non-uniform fuel distribution within the intake port by injecting fuel at specific locations and angles. The fuel is directed toward specific regions of the intake port where it can be carried by air flow into the cylinder, creating localized rich zones that promote better mixing and more reliable ignition while maintaining overall system simplicity
2Manufacturing precision
If fuel is injected at high pressure to improve atomization, then mixing quality improves, but the risk of pre-ignition and knock increases
Solution Approach 1:
The invention extracts the fuel injection process from the compression stroke and relocates it to the intake port during the intake stroke. This separation removes the harmful effect of high-pressure injection during compression, as the fuel is introduced earlier when the air-fuel mixture has more time to mix uniformly, reducing localized rich zones that could cause pre-ignition and knock while still achieving good mixing quality
Solution Approach 2:
Fuel injection occurs during the intake stroke before compression begins, allowing the fuel to be distributed and mixed with air in advance. This preliminary mixing action reduces the need for high-pressure injection during compression, thereby maintaining mixing quality while avoiding the harmful effects of late-stage high-pressure injection that can cause pre-ignition
3Productivity
If engine design is optimized for traditional fuels, then combustion efficiency is good, but adaptability to hydrogen fuel deteriorates
Solution Approach 1:
The invention employs dynamically adjustable fuel injection parameters including injection timing, duration, and quantity that can be optimized for different fuel types. The system can adapt injection strategies based on the specific fuel being used, allowing the same engine platform to efficiently combust different fuel types by modifying control parameters rather than hardware
Solution Approach 2:
The intake port injection system serves multiple functions: it can deliver fuel for various fuel types (hydrogen, hydrocarbons, blends), control air-fuel mixing quality, and adjust to different operating conditions. This universal approach allows a single engine design to accommodate multiple fuel types by modifying injection control strategies rather than requiring fuel-specific engine designs
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
Enhances fuel-air mixing, improving ignition predictability and reducing undesired combustion phenomena like knock and pre-ignition, thereby optimizing combustion efficiency.
Implementation Method 1
feeding pressurized air through a manifold into a plurality of intake ports... feeding the pressurized intake air through each of the plurality of intake ports... defining flow streamlines in each respective intake port
Implementation Method 2
admitting a gaseous fuel from a plurality of fuel admission tubes into streams of the pressurized air... advancing the gaseous fuel into the respective two intake valve openings... in a manner proportionally concentrated along the respective flow streamlines
Data Source
AI summary
Operating a gaseous fuel engine system includes opening and closing two intake valves for each of a plurality of intake ports to fluidly connect the intake ports to cylinders in an engine via two intake valve openings. Pressurized intake air is fed through each of the intake ports so as to define flow streamlines extending to inward sides of the respective two intake valve openings. Gaseous fuel admitted to each of the plurality of intake ports is advanced into cylinders in an engine in a manner proportionally concentrated around the respective flow streamlines. When advanced into the cylinders the gaseous fuel may be biased in distribution away from cylinder walls thereof. In an embodiment the gaseous fuel includes a gaseous hydrogen fuel. Related apparatus is also disclosed.