V-Twin Motorcycle Engine Direct Fuel Injection
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Solution Overview
Problem
V-twin motorcycle engines with port fuel injection suffer from cross-talk between cylinders due to short intake manifolds, leading to undesirable emissions and unattractive direct fuel injection components, which have not been effectively addressed in previous solutions.
Innovation Solution
An air-cooled V-twin engine with direct fuel injection system that includes high-pressure fuel pumps driven by the camshaft, concealed fuel injectors within the cylinder heads, and a control module to regulate fuel pressure, minimizing aesthetic impact and eliminating cross-talk between cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If port fuel injection is used in V-twin engines, then the engine structure is simpler, but cross-talk between cylinders occurs due to short intake manifolds leading to undesirable emissions
Solution Approach 1:
The patent divides the fuel injection system into separate direct injection units for each cylinder, with each injector positioned independently in its combustion chamber. This segmentation eliminates the shared intake manifold that causes cross-talk in port fuel injection systems, allowing each cylinder to receive fuel independently without interference from the other cylinder.
2Object-generated harmful factors
If direct fuel injection components are added to improve emissions and power output, then emissions are reduced, but the aesthetic appeal of the engine is compromised due to visible GDFI components
Solution Approach 1:
The fuel injectors are nested within the cylinder heads, positioned inside the combustion chambers rather than externally mounted. The high-pressure fuel pump is integrated into the engine structure, with its drive mechanism nested within the camshaft assembly. This nesting approach conceals the GDFI components within existing engine boundaries, maintaining the aesthetic appearance while achieving direct injection benefits.
3Power
If direct fuel injection is implemented to eliminate cross-talk, then power output is enhanced, but the device complexity increases due to additional GDFI components
Solution Approach 1:
The camshaft serves multiple functions: it provides valve actuation for the engine and simultaneously drives the high-pressure fuel pump through its end. This multi-functionality eliminates the need for a separate drive mechanism for the fuel pump, reducing overall system complexity despite adding direct injection capability. The rocker boxes are also designed to conceal fuel injectors while maintaining their valve actuation function.
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 solution reduces undesirable emissions and enhances power output while maintaining the aesthetic appeal of the engine by directly injecting fuel into combustion chambers, eliminating cross-talk and concealing the GDFI components.
Implementation Method 1
The first and second cylinders and the first and second cylinder heads comprise cooling fins
Implementation Method 2
The first fuel pump is operatively connected to the fuel tank and to the second fuel pump in a manner such that the first fuel pump can pump fuel from the fuel tank and supply fuel to the second fuel pump
Implementation Method 3
The first and second fuel injectors are attached to the first and second cylinder heads respectively in a manner such that the first and second fuel injectors can discharge fuel directly into the first and second combustion chambers respectively
Data Source
AI summary
An air cooled V-twin engine comprises first and second cylinders, first and second cylinder heads, first and second fuel injectors, a fuel tank, and first and second fuel pumps. The cylinders and the cylinder heads comprise cooling fins and define first and second combustion chambers. Each of the fuel injectors is attached to a respective one of the cylinder heads in a manner such that they can discharge fuel directly into said combustion chamber. The first fuel pump is operatively connected to the fuel tank and to the second fuel pump in a manner such that the first fuel pump can pump fuel from the fuel tank to the second fuel pump. The second fuel pump is operatively connected to the fuel injectors in a manner such that the second fuel pump can pump fuel to the fuel injectors.