Fuel Injector Connecting Piece With Accumulator Pulse Damping
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Solution Overview
Problem
In common-rail injection systems for internal combustion engines, pressure waves generated by high-pressure pumps propagate through fuel lines, impairing uniform fuel flow in series connections, where each injector requires two high-pressure ports for connection, leading to pressure pulsation issues.
Innovation Solution
A connecting piece with separate high-pressure channels for input and output ports, which indirectly connect via an internal high-pressure accumulator, optionally with throttles in the feed channels, to attenuate pressure pulsations and prevent their propagation to downstream injectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If series connection of fuel injectors is implemented, then fuel distribution efficiency is improved, but pressure pulsations propagate through fuel lines impairing uniform fuel flow
Solution Approach 1:
The connecting piece is divided into separate high-pressure channels for input and output ports, with each channel independently connected to the accumulator. This segmentation prevents pressure pulsations from propagating through the fuel line while maintaining series connection functionality for fuel distribution.
Solution Approach 2:
An internal high-pressure accumulator is introduced as an intermediary component between the input and output ports. The accumulator acts as a buffer that absorbs pressure pulsations generated by the high-pressure pump, preventing them from propagating to downstream injectors while maintaining steady fuel flow.
2Stability of the object's composition
If separate high-pressure channels with internal accumulator are used, then pressure pulsation propagation is attenuated, but device complexity increases
Solution Approach 1:
The accumulator and connecting piece functions are merged into a single integrated component. The accumulator is positioned within the connecting piece housing, combining the functions of connection and pressure buffering in one element, thereby reducing overall system complexity despite the added functionality.
Solution Approach 2:
The connecting piece serves multiple functions: it provides series connection for fuel distribution, houses the accumulator for pressure pulsation attenuation, and maintains uniform fuel flow to downstream injectors. This multi-functionality reduces the need for separate components, offsetting the complexity increase.
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 solution effectively eliminates or attenuates pressure pulsations within the high-pressure lines, ensuring uniform fuel flow and reducing the impact of pump-induced pressure waves on subsequent injectors in series connections.
Implementation Method 1
An essential aspect here is the fact that the ports, i.e. the at least one high-pressure input port and the at least one high-pressure output port only indirectly are in fluid connection with each other via the internal high-pressure accumulator. As a result, possible pressure pulsations within the high-pressure lines can be eliminated or sufficiently attenuated by means of the internal high-pressure accumulator
Implementation Method 2
a throttle is additionally installed in the high-pressure feed channel from the high-pressure input port up to the internal high-pressure accumulator
Data Source
AI summary
The invention relates to a connecting piece for a fuel injector of an internal combustion engine comprising at least one high-pressure input port and at least one high-pressure output port, wherein the high-pressure input port and the high-pressure output port open into an internal high-pressure accumulator of the connecting piece and/or the injector via separate high-pressure feed channels.