Fuel Injection Device Discrete Accumulator Chamber
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Solution Overview
Problem
Existing fuel injection systems for internal combustion engines face challenges in achieving a space-saving design while maintaining reliability and efficient injection processes, particularly with small accumulator volumes and potential for leakage.
Innovation Solution
A device with a filter that retains solid particles and serves as a stop for the non-return valve, allowing for a simple and space-saving design, featuring a pressure connector with a screw-connected accumulator housing and pressure pipe, which forms a stable structural unit and enables the integration of additional components like non-return valves and flow restrictors, allowing each injection valve to have a discrete accumulator chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common rail is used to supply fuel to multiple injection valves, then the system can achieve stable and reproducible injection processes, but the device complexity and space requirements increase
Solution Approach 1:
The patent divides the common rail system into discrete accumulator chambers, with each injection valve having its own dedicated accumulator chamber. This segmentation allows each injector to have independent fuel storage while eliminating the need for a large common rail, reducing overall system complexity and space requirements while maintaining injection stability.
Solution Approach 2:
The accumulator chamber serves multiple functions: it stores fuel, provides pressure stabilization, and acts as a decoupling element between the fuel pump and injection valve. This multi-functionality reduces the need for separate components, simplifying the overall system while maintaining reliable injection processes.
2Volume of moving object
If the accumulator chamber volume is reduced to save space, then the device becomes more compact, but the fuel storage capacity and stability are compromised
Solution Approach 1:
The patent utilizes hydraulic principles by incorporating a non-return valve with bypass throttle in parallel with the accumulator chamber. This hydraulic arrangement allows the system to maintain stable pressure and fuel flow even with small accumulator volumes, as the bypass throttle can compensate for pressure variations and the non-return valve prevents backflow, ensuring reliable fuel supply without requiring large storage capacity.
3Volume of moving object
If injection valves are supplied with fuel through separate pressure pipes connected to discrete accumulator chambers, then space is saved and design flexibility is improved, but leakage risks and manufacturing complexity increase
Solution Approach 1:
The patent integrates the pressure pipe and accumulator chamber into a single integrated component structure. The pressure pipe is formed as one piece with the accumulator chamber, eliminating separate connections and reducing potential leakage points. This merging of components maintains compact design while improving reliability by removing interfaces where leakage could occur.
4Reliability
If a filter is added to retain solid particles, then fuel filtration is improved, but the device complexity and space requirements increase
Solution Approach 1:
The filter is integrated directly into the accumulator chamber structure, with the filter element forming part of the chamber wall. This merging of the filter with the accumulator chamber allows fuel filtration to be achieved without adding separate external components, maintaining compact design while improving fuel quality through effective particle retention.
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 ensures reliable and efficient injection processes without a common rail, allowing for optimal operation even with small accumulator volumes, and enables cost-effective production with greater tolerances between guide and seat components.
Implementation Method 1
A filter retains solid particles in the fuel, which prevents blockage of in particular narrow flow cross sections
Implementation Method 2
a non-return valve with bypass throttle connected parallel thereto
Implementation Method 3
The injection valves are connected by means of fuel lines to a high-pressure feed device. By virtue of each injection valve being assigned a non-return valve with bypass throttle connected parallel thereto, it is possible with said high-pressure accumulator injection system to realize stable and reproducible injection processes with an expedient pressure profile
Implementation Method 4
a pressure connector with a screw-connected accumulator housing and pressure pipe, which forms a stable structural unit
Data Source
AI summary
The invention relates to an injection device for injecting high-pressure fuel into the combustion chamber of an internal combustion engine, the device comprising an injection valve assigned to a discrete reservoir chamber. A non-return valve operates between the chamber and the high-pressure supply line and the filter, which is preferably designed as an edge filter, forms a stop for limiting the opening motion of the valve member that is preferably designed as a valve member plate.