Fuel Injection Arrangement with Pressure Regulation
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Solution Overview
Problem
Dual-fuel engines require complex and costly separate fuel injection systems for injecting different amounts of fuel at varying pressures, which increases system complexity and cost.
Innovation Solution
A fuel injection arrangement using a single pressure medium source and selector valve to supply fuel to multiple injectors, with a second valve for injecting smaller amounts of fuel, and means for regulating pressure and controlling timing, eliminating the need for separate systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate fuel injection systems are used for different fuel injectors with different fuel amounts and pressures, then each injector can be supplied with appropriate fuel pressure and amount, but the system complexity and cost increase
Solution Approach 1:
The patent applies universality by using a single fuel injection pump that can supply fuel to multiple different fuel injectors with different requirements. The pump is designed to work with both the first fuel injector (for main fuel injection) and the second fuel injector (for pilot fuel injection), eliminating the need for separate pumping systems. This multi-functional approach reduces system complexity while maintaining the ability to adapt to different injection requirements through the selector valve and pressure regulation means.
Solution Approach 2:
The patent uses intermediary elements to bridge the gap between a single fuel source and multiple injectors with different requirements. The selector valve acts as an intermediary to direct fuel flow to either the first or second fuel injector, while the pressure regulation means serves as an intermediary to adjust fuel pressure for the second injector. These intermediaries enable a single pump to effectively serve multiple injectors with different specifications.
2Device complexity
If a single pressure medium source is used to supply fuel to multiple injectors with different pressure requirements, then system cost and complexity are reduced, but precise pressure control for each injector becomes more difficult
Solution Approach 1:
The patent applies segmentation by dividing the fuel supply path into separate controllable segments. The selector valve segments the fuel flow to direct it to either the first or second fuel injector, while the pressure regulation means segments the pressure control specifically for the second fuel duct. This segmentation allows independent control of pressure and flow to each injector despite using a single pump, maintaining precision while reducing overall system complexity.
Solution Approach 2:
The patent uses dynamic pressure regulation to adapt fuel pressure to the specific requirements of each injector. The pressure regulation means in the second fuel duct can dynamically adjust pressure levels based on the operational mode (pilot fuel injection vs. main fuel injection). This dynamic adjustment capability ensures precise pressure control for each injector type while using a single, flexible fuel supply system.
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
Simplifies the fuel injection system by allowing the same pressurized fuel source to be used for different injectors, reducing complexity and cost while maintaining precise control over fuel injection.
Implementation Method 1
means for regulating pressure in the second fuel duct between the selector valve and the second fuel injection valve
Data Source
AI summary
The fuel injection arrangement for injecting liquid fuel into a cylinder (11) of a piston engine comprises a first fuel injection valve (1), a second fuel injection valve (2) and a pressure medium source (3) for supplying fuel to the fuel injection valves (1, 2). A selector valve (4) is used for choosing which one of the fuel injection valves (1, 2) is used. A first fuel duct (6) connects the first fuel injection valve (1) to the selector valve (4), and a second fuel duct (7) connects the second fuel injection valve (2) to the selector valve (4). The arrangement comprises means (8) for regulating pressure in the second fuel duct (7) between the selector valve (4) and the second fuel injection valve (2).