Multi-function Fuel Injector Valve for Dual Fuel Timing Control
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Solution Overview
Problem
Existing dual fuel engine systems face challenges in efficiently controlling the injection timing and pressure of a combination of two fuels, which can affect combustion efficiency and emissions.
Innovation Solution
A multifunctional control valve is introduced in a fuel injector that allows for the admission of a first fuel into a combined fuel charge, controlling the injection timing and pressure by moving between different positions to fluidly connect or block various passages within the injector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual fuel system uses separate injection systems for diesel and gaseous fuel, then each fuel can be injected independently, but the device complexity increases and control precision deteriorates
Solution Approach 1:
The patent merges the diesel fuel injection system and gaseous fuel injection system into a single integrated fuel injector. The injector housing contains both a diesel fuel inlet and a gaseous fuel inlet, with internal passages that allow both fuels to be delivered through the same nozzle check assembly. This consolidation reduces the number of separate injection systems while maintaining the ability to independently control each fuel type, thereby reducing device complexity without sacrificing combustion efficiency.
Solution Approach 2:
The fuel injector is designed as a multi-functional device that can handle both diesel fuel and gaseous fuel through the same basic structure. The nozzle check assembly serves dual purposes: it controls diesel fuel injection when the gaseous fuel inlet is blocked, and it controls gaseous fuel injection when the diesel fuel inlet is blocked. This universal design allows a single device to perform multiple functions, reducing overall system complexity while maintaining reliable combustion control.
2Device complexity
If a dual fuel system uses a single integrated fuel injector, then device complexity is reduced, but control precision over injection timing and pressure deteriorates
Solution Approach 1:
The integrated fuel injector is segmented into distinct functional zones with separate inlet passages for diesel fuel and gaseous fuel. The internal geometry includes dedicated flow paths that allow independent control of each fuel type. The nozzle check assembly is segmented to accommodate both fuel types, with separate control mechanisms that can independently regulate injection timing and pressure for each fuel, thereby maintaining precision control despite the integrated design.
Solution Approach 2:
The patent introduces intermediary control elements within the integrated injector, such as separate valve mechanisms or control passages that mediate between the fuel sources and the nozzle check. These intermediaries allow precise control of injection timing and pressure for each fuel type by providing additional control points within the integrated structure, ensuring that the simplification of having a single injector does not compromise control precision.
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 control valve effectively manages the injection of a dual fuel charge, optimizing combustion efficiency and reducing emissions by precisely controlling the timing and pressure of fuel injection.
Implementation Method 1
relieve a closing hydraulic pressure on a nozzle check of the fuel injector
Data Source
AI summary
A fuel injector in a fuel system having a first fuel supply of a first fuel and a second fuel supply of a second fuel includes a multifunctional control valve movable in the fuel injector to control admission of the first fuel to a combined-fuel outlet passage, and to control a timing and an injection pressure of a fuel charge containing the first fuel. In an embodiment the first fuel includes a compression-ignition fuel such as diesel and the second fuel includes an alcohol fuel such as methanol. Related apparatus and methodology is disclosed.