Fuel Valve for Two-Stroke Engine Using Fuel Pressure Actuation
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Solution Overview
Problem
Existing fuel valves for large two-stroke uniflow scavenged internal combustion engines require additional complex and costly hydraulic systems to control fuel injection, leading to increased complexity, expense, and potential reliability issues due to the risk of fuel and hydraulic oil mixing.
Innovation Solution
A fuel valve design that utilizes fuel pressure to control the displacement of a valve member, with an electronically controlled solenoid valve to manage fuel pressure and an obstruction member to selectively obstruct the valve member's movement, eliminating the need for external hydraulic systems and reducing the risk of fuel and hydraulic oil mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a hydraulic system is used to control fuel injection, then precise control over pilot and main injections is achieved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the external hydraulic system from the fuel injection control mechanism. Instead of using a separate hydraulic system with hydraulic oil, the invention uses the fuel itself as the pressure medium to actuate the valve member, thereby removing the complex hydraulic infrastructure while maintaining precise control capability
Solution Approach 2:
The fuel serves a dual function: it is both the substance being injected and the pressure medium for actuating the valve member. This multi-functionality eliminates the need for separate hydraulic oil and hydraulic system components, reducing device complexity while preserving control precision
2Measurement precision
If a hydraulic system is used to control fuel injection, then fuel injection control is achieved, but the risk of fuel and hydraulic oil mixing increases
Solution Approach 1:
The invention extracts and removes the hydraulic oil from the system entirely. By using fuel as the pressure medium instead of hydraulic oil, there is no possibility of mixing between fuel and hydraulic oil, thereby eliminating this reliability concern while maintaining control functionality
Solution Approach 2:
The system uses a single fluid medium (fuel) for both actuation and injection purposes. This homogeneity eliminates the interface between dissimilar fluids (fuel and hydraulic oil) that could lead to mixing problems, sealing challenges, and contamination risks
3Measurement precision
If external hydraulic systems and associated components are used, then fuel injection control is achieved, but manufacturing cost increases
Solution Approach 1:
The patent removes the external hydraulic system, hydraulic valves, and associated components from the design. This extraction eliminates the need for complex manufacturing processes, specialized seals, and additional assembly steps, thereby reducing manufacturing cost while maintaining control precision through the simplified fuel-pressure actuation mechanism
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 fuel valve achieves precise control over pilot and main fuel injections, enhancing engine performance and reducing emissions, while simplifying the design and reducing costs by eliminating the need for complex hydraulic systems and associated components.
Implementation Method 1
the valve member is resiliently biased towards the closed position
Implementation Method 2
hydraulically urged towards the open position by fuel pressure of the fuel inlet port acting on a first surface of the valve member
Implementation Method 3
an electronically controlled valve, preferably a solenoid valve
Data Source
Figure 1~2
Figure 3
Figure 4~7
AI summary
A fuel valve (30) for injection of liquid fuel into a combustion chamber of a large two-stroke turbocharged uniflow scavenged internal combustion engine with crossheads, and a large two-stroke turbocharged uniflow scavenged internal combustion engine with crossheads with such fuel valves. The fuel valve (30) uses a resiliently biased valve member (35) that obtains lift through the pressure of the fuel supplied to the fuel valve (30) and is configured for performing either a pilot fuel injection or a main fuel injection, using a hydraulically controlled system using fuel as the hydraulic medium and controlled by an electronic control valve for determining whether a pilot injection or for a main injection is performed when the externally supplied fuel pressure is increased to perform an injection event.