Opposite-Flow Fuel Injection for Boat Engine Uniformity
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Solution Overview
Problem
Conventional fuel supply systems for boats with fuel injection devices positioned near the combustion chamber often result in uneven fuel distribution in the intake passage, leading to fluctuations in the air-fuel ratio and decreased combustion efficiency, especially when a single fuel injection device is used for multiple cylinders.
Innovation Solution
A fuel supply system where the fuel injection device injects fuel in a direction opposite to the airflow in the intake passage, ensuring even distribution and atomization of fuel, thereby maintaining a consistent air-fuel ratio across all cylinders, and is preferably located near the throttle body to maximize airflow and minimize adherence to internal surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fuel is injected toward the direction in which air flows in the intake passage, then fuel can be injected from upstream to downstream near the combustion chamber, but fuel adheres to the wall surface of the intake passage and distributes unevenly
Solution Approach 1:
The patent inverts the conventional fuel injection direction by injecting fuel from downstream to upstream (opposite to airflow direction) instead of from upstream to downstream. This inversion prevents fuel from adhering to the intake passage wall surface and ensures even fuel distribution across all intake pipes, resolving the contradiction between fuel distribution uniformity and combustion efficiency
2Device complexity
If a single fuel injection device is provided to multiple intake pipes, then system complexity is reduced, but uneven fuel distribution causes air-fuel ratio fluctuations in each cylinder
Solution Approach 1:
By inverting the fuel injection direction to flow from downstream to upstream, a single fuel injection device can effectively distribute fuel evenly across multiple intake pipes. The inverted direction creates proper atomization and distribution patterns that maintain consistent air-fuel ratios in all cylinders, allowing system simplification without compromising reliability
3Ease of manufacture
If fuel is injected in the direction of airflow, then the injection system is simpler to configure, but fuel adheres to surfaces and atomization is poor
Solution Approach 1:
The patent inverts the fuel injection direction to oppose the airflow direction (from downstream to upstream). This inversion improves fuel atomization quality by creating proper collision and mixing conditions with the incoming air, preventing fuel from adhering to surfaces, while maintaining relatively simple injection system configuration
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 ensures even distribution of the air-fuel mixture to each cylinder, preventing deterioration in combustion efficiency and reducing the need for multiple fuel injection devices, thus decreasing system complexity and weight.
Implementation Method 1
fuel is injected in a direction (from downstream to upstream) opposite to the airflow direction in the intake passage. Therefore, by colliding with air, the fuel can be atomized and distributed evenly in the air
Data Source
AI summary
A fuel supply system for a boat minimizes and prevents deterioration in combustion efficiency of the engine. The fuel supply system includes a throttle body that is connected to an engine and that supplies air to the engine, and an injector that injects fuel to the throttle body. The injector is configured to inject fuel to a direction opposite to an airflow direction in the throttle body.