Dual-Fuel Injection System Using Liquid Fuel Control
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Solution Overview
Problem
Existing dual-fuel fuel injection systems for internal combustion engines require additional hydraulic fluid and complex control systems for gas injector management, leading to increased complexity and space requirements.
Innovation Solution
A dual-fuel fuel injection system where liquid fuel serves as the control fluid for the gas injector assembly, eliminating the need for additional hydraulic fluid and using a shared tank and high-pressure pumps to manage both liquid and gas fuel injection, with optional pilot injection for igniting gas mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional hydraulic fluid and control systems are used for gas injector management, then reliable control of gas injector assembly is achieved, but device complexity and installation space increase
Solution Approach 1:
The liquid fuel system is designed to serve dual purposes: it acts as both the fuel source for liquid fuel operation and as the control fluid for the gas injector assembly during gas operation. This multi-functionality eliminates the need for separate hydraulic fluid and control systems, thereby reducing device complexity while maintaining reliable control capability.
Solution Approach 2:
The patent merges the control fluid function with the liquid fuel system by using liquid fuel as the control fluid for the gas injector assembly. This consolidation combines what would traditionally be separate systems (hydraulic control system and fuel system) into a unified system, reducing the number of components and simplifying the overall structure.
2Quantity of substance
If additional hydraulic fluid storage containers and lines are provided, then sufficient control fluid supply is ensured, but installation space increases
Solution Approach 1:
The liquid fuel tank and delivery system serve dual functions: supplying fuel during liquid fuel operation and providing control fluid during gas operation. This eliminates the need for separate storage containers and lines for hydraulic fluid, significantly reducing the installation space required while ensuring adequate control fluid supply.
3Stress or pressure
If larger high-pressure pumps are used for liquid fuel operation, then sufficient fuel pressure is achieved, but pump assembly size and complexity increase
Solution Approach 1:
The pump assembly is segmented into multiple smaller pumps connected in parallel, each capable of providing controlled fuel flow. This segmentation allows the system to achieve required fuel pressure through coordinated operation of smaller units rather than requiring a single large complex pump, simplifying the overall pump assembly design while maintaining necessary pressure output.
Data Source
AI summary
A dual-fuel fuel injection system for an internal combustion engine has a liquid fuel injection branch and a gas fuel injection branch, in which a gas injector assembly that is controllable via a control fluid is situated. The liquid fuel forms the control fluid of the gas injector assembly.