Fuel Valve Third Pressure Surface Balancing
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Solution Overview
Problem
Conventional fuel valves for large two-stroke self-igniting turbocharged internal combustion engines face challenges in maintaining high injection pressure throughout the injection event due to a lower closing pressure compared to opening pressure, resulting in less than optimal combustion.
Innovation Solution
The fuel valve design incorporates a third effective pressure surface that assists the resilient biasing means to ensure the valve needle returns to its seat at a pressure equal to or slightly lower than the opening pressure, maintaining high injection pressure by using a pressure chamber and conduit system to balance forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve needle is resiliently biased towards the valve seat, then the valve can be closed by reducing fuel pressure, but the closing pressure becomes significantly lower than the opening pressure due to increased effective pressure surface
Solution Approach 1:
The patent introduces a third effective pressure surface that acts as a counterbalancing force against the increased second effective pressure surface. This third surface creates a counteracting force that prevents the closing pressure from dropping significantly below the opening pressure, effectively balancing the force imbalance caused by the valve needle lifting from the seat.
Solution Approach 2:
The patent modifies the pressure distribution parameters by introducing a third effective pressure surface with specific geometric characteristics. This changes the force balance parameters during valve operation, ensuring that the closing pressure remains close to the opening pressure by adjusting the effective pressure surfaces areas and positions.
2Productivity
If the valve needle lifts from the seat at a preset pressure, then fuel injection can begin, but the injection pressure drops significantly by the end of the injection event
Solution Approach 1:
The third effective pressure surface provides a counterbalancing force that prevents the injection pressure from dropping during the injection event. This counterforce compensates for the pressure drop that would normally occur as the valve needle remains lifted, ensuring consistent high-pressure injection throughout the entire injection duration.
Solution Approach 2:
The patent ensures continuous high-pressure fuel injection by maintaining a balanced force system throughout the injection event. The third effective pressure surface continues to act during the entire injection duration, preventing pressure drop and ensuring the useful action of high-pressure injection continues consistently from start to finish.
3Force
If the effective pressure surface increases when the valve needle lifts, then the valve can open against spring bias, but the valve needle does not return to its seat before pressure falls significantly
Solution Approach 1:
The third effective pressure surface acts as a counterbalancing element that prevents excessive pressure drop during valve operation. It provides a continuous counterforce that ensures the valve needle returns to its seat at or near the opening pressure, preventing the pressure from falling significantly below the opening pressure threshold.
Solution Approach 2:
The patent creates a feedback mechanism where the third effective pressure surface responds to pressure changes by providing a counterbalancing force. When pressure increases to open the valve, the third surface activates to prevent excessive pressure drop, creating a self-regulating system that maintains pressure within a narrow range around the opening pressure.
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 design ensures consistent and high fuel injection pressure throughout the event, improving combustion efficiency by maintaining equal opening and closing pressures.
Implementation Method 1
the valve needle being resiliently biased towards the valve seat by a resilient bias
Implementation Method 2
the valve needle when resting on the valve seat having a first effective pressure surface that under influence of fuel pressure causes a first force on the valve needle opposing the resilient bias
Data Source
AI summary
A fuel valve for injecting fuel into the combustion chamber of a large two-stroke self-igniting internal engine combustion engine, with a valve needle that is resiliently biased towards a valve seat. The effective pressure surface that causes fuel pressure to urge the valve needle in the opening direction increases significantly when the valve needle has lift from the valve seat. A supplementary effective pressure surface is provided on the valve needle. The supplementary effective pressure surface creates a force urging the valve needle towards the valve seat when the supplementary effective pressure surface is exposed to fuel pressure.