Internal Combustion Engine Fuel Opening Spacing
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Solution Overview
Problem
Internal combustion engines with divided intake channels experience unfavorable running behavior due to insufficient fuel delivery through the air duct during idling and low partial throttle, as fuel is pressed against the channel wall, forming a wall film and failing to enter the air duct.
Innovation Solution
The engine design includes a fuel opening spaced from the intake channel wall, allowing fuel to be carried by the air stream into both the air and mixture ducts, preventing wall film formation and ensuring fuel delivery during idling and low throttle conditions, with the connecting opening between the ducts being substantially closed at full throttle to maintain separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fuel opening is disposed close to the wall of the intake channel, then the structure is simple and easy to manufacture, but the fuel is pressed against the wall forming a wall film and fails to enter the air duct
Solution Approach 1:
The fuel opening is positioned at a specific location spaced from the wall by a first distance, creating a localized quality difference in the fuel delivery system. This spatial positioning ensures that fuel is delivered into the flow rather than against the wall, preventing wall film formation while maintaining manufacturing simplicity
Solution Approach 2:
The solution moves the fuel opening from a wall-adjacent position (2D surface problem) to a position spaced from the wall into the three-dimensional flow field. This dimensional change allows fuel to be carried along by the air stream rather than being pressed against the wall
2Adaptability or versatility
If the connecting opening between air duct and mixture duct is open, then fuel can be supplied via the air duct during idling and low partial throttle, but turbulence presses fuel against the wall preventing it from entering the air duct
Solution Approach 1:
The fuel opening is positioned at a specific location spaced from the wall, creating a localized quality in the fuel delivery path that prevents wall film formation while maintaining the ability to supply fuel through the air duct during idling and low partial throttle conditions
3Reliability
If the fuel opening extends into the flow spaced from the wall, then fuel is carried along by the air stream into the air duct, but the fuel opening becomes more complex
Solution Approach 1:
The fuel opening is positioned at a specific location spaced from the wall by a first distance, creating a localized quality difference that enables fuel to be delivered into the flow. This simple positional change achieves reliable fuel delivery without requiring complex structural modifications
Solution Approach 2:
The fuel opening positioned in the flow allows the air stream itself to carry the fuel into the air duct. The system uses the existing airflow to perform the fuel delivery function, eliminating the need for additional complex mechanisms
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 engine running behavior by ensuring fuel is effectively transferred into both ducts, reducing wall film formation and enhancing performance across various throttle positions.
Implementation Method 1
The fuel that is exiting is carried along by the air stream and can thus also pass into the air duct through the connecting opening
Implementation Method 2
turbulence forms in the region of the throttle element, which leads to a pressing of the fuel exiting from the fuel openings against the wall of the intake channels
Data Source
AI summary
An internal combustion engine having an intake channel that is divided by a partition into an air duct and a mixture duct. The partition has a connecting opening that at least at full throttle of the internal combustion engine is substantially closed. A main fuel opening opens out into the mixture duct. At least one further fuel opening is provided that opens out into the mixture duct at a first distance relative to the wall of the intake channel and at a second distance relative to the partition.