Fuel System Reservoir Segmentation for Dual-Fuel Mixing Prevention
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Solution Overview
Problem
Dual fuel engines face challenges in preventing the mixing of different fuel types before reaching the combustion chambers, leading to increased complexity and cost when using separate fuel injection systems, and risk of fuel mixing when sharing a conduit.
Innovation Solution
A fuel system with a reservoir and separation device that divides into two volumes, allowing a single high-pressure pump to pressurize one fuel for injection and use as a working fluid to pump the second fuel, ensuring separate delivery of fuels through separate conduits and injectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two complete fuel injection systems with separate pumps, common rails and injectors are provided for each fuel type, then the risk of fuel mixing is eliminated, but the system complexity and cost increase significantly
Solution Approach 1:
The common rail is segmented into two separate volumes (first volume and second volume) using a separation device, allowing each fuel type to be contained in its own space while sharing the same physical rail structure. This segmentation prevents fuel mixing while avoiding the need for completely separate injection systems.
Solution Approach 2:
A separation device acts as an intermediary element within the common rail, physically dividing the two fuel volumes and preventing mixing. This intermediary structure enables single-rail operation with dual fuel types without requiring full system separation.
2Device complexity
If a single high pressure pump is used for both fuel types, then the system complexity and cost are reduced, but the risk of fuel mixing increases when sharing a conduit
Solution Approach 1:
The common rail is divided into separate volumes for each fuel type, creating distinct pathways within the shared conduit system. This allows a single pump to serve both fuels without direct mixing, as the separation device maintains physical boundaries between fuel streams.
Solution Approach 2:
The single high pressure pump performs multiple functions by pressurizing both fuel types through the shared pump inlet, while the segmented common rail ensures proper separation. This universal approach reduces component count while maintaining fuel integrity.
3Adaptability or versatility
If fuels with poor lubrication properties or unfavorable viscosity are used, then fuel flexibility and environmental benefits are improved, but the pump may be damaged
Solution Approach 1:
The first fuel acts as an intermediary lubricating medium between the pump and the second fuel. Since the first fuel has good lubrication properties, it protects the pump during handling, while allowing the use of second fuels with poor lubrication properties that would otherwise damage the pump.
Solution Approach 2:
The first fuel serves dual purposes: it is both the injected fuel for combustion and the working fluid that lubricates the pump and drives the separation device. This self-service approach allows the pump to be protected by a fuel it already handles for injection.
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 solution minimizes fuel mixing risk, reduces system complexity and cost by using a single high-pressure pump for both fuels, and allows for the use of fuels with poor lubrication properties or unfavorable viscosity without damaging the pump.
Implementation Method 1
the separation device may be moved or flexed by a pressure difference in the first and second volumes so as to change the sizes of the first and second volumes
Implementation Method 2
the pump is suitably arranged to pressurize first fuel from the first fuel container
Data Source
AI summary
A fuel system for an internal combustion engine is provided including a first fuel container for a first fuel, a second fuel container for a second fuel, a pump, and a first fuel injector, the fuel system being arranged to provide a communication between the first fuel container and the pump and between the pump and the first fuel injector, and a reservoir with a separation device adapted to divide the reservoir into a first volume and a second volume, whereby the separation device may be moved or flexed by a pressure difference in the first and second volumes so as to change the sizes of the first and second volumes, wherein the fuel system is arranged to provide a communication between the pump and the first volume, and to provide a communication between the second fuel container and the second volume and between the second volume and a second fuel injector.