Fuel Injection Device with Nested Storage Units
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Solution Overview
Problem
Existing fuel injection systems for compression-ignition engines face challenges in achieving low pressure drop and pressure fluctuations at high nominal injection amounts without requiring significant structural changes to the engine.
Innovation Solution
The solution involves combining fuel injectors with internal storage volumes (third storage unit) with a common rail system (first storage unit) and additional storage units (second storage unit) for each fuel injector, optimizing the volumes of these storage units relative to the nominal injection amount to minimize pressure drop and fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common rail system with additional storage units is used to reduce pressure drop and fluctuations, then fuel supply reliability improves, but device complexity increases
Solution Approach 1:
The patent implements a nested storage unit structure where a second storage unit is positioned inside the housing of the fuel injector, and a third storage unit is integrated within the injector body itself. This nested arrangement allows multiple storage functions to be combined in a space-efficient manner, reducing the overall system complexity while maintaining fuel supply reliability and minimizing pressure fluctuations during high nominal injection amounts.
Solution Approach 2:
The fuel injection system is divided into multiple segmented storage units (first, second, and third storage units) with specific volume ratios. The second storage unit serves as an intermediate buffer between the common rail and the injector, while the third storage unit provides additional buffering within the injector. This segmentation allows each storage unit to be optimized for specific functions, managing complexity through functional division while ensuring reliable fuel supply.
2Stability of the object's composition
If storage volumes are increased to reduce pressure fluctuations, then pressure stability improves, but the size of storage units increases
Solution Approach 1:
By nesting the second storage unit within the injector housing and the third storage unit within the injector body, the patent achieves compact volume utilization. The nested structure allows the storage volumes to be distributed throughout the available space in the system rather than requiring a single large external tank, thus maintaining pressure stability while minimizing the overall volume occupied by storage units.
Solution Approach 2:
The patent applies different storage volume allocations at different locations in the system. The second storage unit has a volume of 20-150 times the nominal injection amount and is positioned at the injector, while the third storage unit has a volume of 3-10 times the nominal injection amount and is integrated within the injector body. This local optimization of storage volumes ensures pressure stability at critical points without requiring excessive total storage volume.
3Productivity
If fuel injectors with high nominal injection amounts are used, then injection capacity improves, but pressure drop and fluctuations increase
Solution Approach 1:
The patent segments the fuel supply system into multiple storage units with the second storage unit (20-150 times nominal injection amount) positioned between the common rail and the fuel injector, and a third storage unit (3-10 times nominal injection amount) integrated within the injector body. This segmentation provides distributed fuel buffering that maintains pressure stability even when the injector operates at high nominal injection amounts, thereby supporting high injection capacity without excessive pressure drop or fluctuations.
Solution Approach 2:
The second and third storage units act as intermediary buffer elements between the common rail system and the high-capacity fuel injector. These intermediate storage units absorb pressure fluctuations and ensure stable fuel supply to the injector during high nominal injection operations, enabling the system to achieve high injection capacity while maintaining pressure stability.
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 configuration allows for the use of fuel injectors with high nominal injection amounts in existing engines without structural changes, ensuring reliable fuel supply and low pressure fluctuations, thereby improving dosing accuracy and operational efficiency.
Implementation Method 1
the first storage unit (20) primarily serves to attenuate the pressure pulsations produced by the conveyor strokes of the individual pump cylinders
Implementation Method 2
supply the individual fuel injectors (50) with high-pressure fuel from a first storage unit (20) arranged in the conveyor pump (16)
Data Source
AI summary
The invention relates to a fuel injection device (100) for a compression-ignition engine, comprising a first storage unit (20) which can be supplied with fuel by at least one high-pressure pump (16), the first storage unit (20) being arranged preferably inside the high-pressure pump (16), a first connecting line (26) from the first storage unit (20) to a second storage unit (30), and a second connecting line (40) from the second storage unit (30) to a fuel injector (50).