Dual-Fuel Engine Injection Valve for Stable Low-GHG Combustion
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Solution Overview
Problem
Conventional engine devices with dual fuel injection systems face manufacturing complexities and high costs due to the use of two common rail systems, and they do not effectively utilize low greenhouse gas fuels like ammonia or alcohol, leading to unstable combustion and increased greenhouse gas emissions.
Innovation Solution
An engine device with a single fuel injection valve that individually injects a low greenhouse gas fuel and a hydrocarbon-based fuel, where 90% of the auxiliary fuel is injected before 50% of the main fuel, promoting stable combustion by leveraging the flammability of the auxiliary fuel to ignite the flame-retardant main fuel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two sets of common rail systems with two fuel injection valves are used to individually inject two types of fuels, then the engine can operate with dual fuel injection, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent merges two separate fuel injection systems (common rail systems with two injection valves) into a single integrated fuel injection valve that can individually control both main fuel and auxiliary fuel injection. This is achieved by providing a single valve body with multiple valve elements (first valve element for main fuel, second valve element for auxiliary fuel) that can be independently actuated, thereby reducing device complexity while maintaining dual fuel injection capability.
Solution Approach 2:
The single fuel injection valve is designed to perform multiple functions: it can inject main fuel through the first injection hole, inject auxiliary fuel through the second injection hole, and control both injection processes independently through multiple valve elements. This multi-functional design eliminates the need for separate injection systems while preserving the ability to individually supply different fuels.
2Device complexity
If a single fuel injection valve is used to inject both main fuel and auxiliary fuel, then device complexity is reduced, but combustion stability of low GHG main fuel deteriorates
Solution Approach 1:
The patent segments the single fuel injection valve into multiple independent control paths by providing separate valve elements (first valve element for main fuel, second valve element for auxiliary fuel) and separate injection holes. This segmentation allows independent control of main fuel and auxiliary fuel injection timing and quantity, enabling the auxiliary fuel to be injected at optimal timing to stabilize combustion of the main fuel while maintaining the benefits of a single integrated valve structure.
3Object-generated harmful factors
If low GHG main fuel is injected without proper auxiliary fuel timing, then greenhouse gas emissions are reduced, but combustion efficiency and stability deteriorate
Solution Approach 1:
The patent applies preliminary action by injecting the auxiliary fuel before the main fuel injection is completed. Specifically, the second valve element for auxiliary fuel injection is controlled to open and close independently, allowing auxiliary fuel to be injected in advance to prepare the combustion environment. This preliminary injection of auxiliary fuel ensures stable combustion when using low GHG main fuel, while the overall strategy of using low-carbon main fuel still achieves emission reduction goals.
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 engine device stabilizes the combustion of low greenhouse gas fuels by using a single fuel injection valve, reducing greenhouse gas emissions and improving combustion efficiency.
Implementation Method 1
an engine that is operated by burning two types of fuels
Data Source
AI summary
An engine device includes an engine that is operated by burning two types of fuels, and one fuel injection valve that can individually inject the two types of fuels to the engine. In the engine device, at the time of injecting the main fuel including a low GHG fuel, which emits less greenhouse gas than a petroleum-based fuel, and the hydrocarbon-based auxiliary fuel as the two types of fuels to the engine by the fuel injection valve, the control device controls 90% of the total injection volume of the auxiliary fuel to be injected before 50% of the total injection volume of the main fuel is injected in one cycle of the engine.