High-Pressure Fuel Pump Low-Pressure Damper Pulsation Damping
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Solution Overview
Problem
High-pressure fuel pumps in internal combustion engines experience non-uniform delivery and pressure pulsations due to piston-driven fuel compression, leading to filling losses and potential damage from vibrations, which existing damping components fail to adequately address.
Innovation Solution
A low-pressure damper is integrated into the high-pressure fuel pump with damper elements arranged symmetrically around a damper longitudinal axis at an angle relative to the pump piston's movement axis, forming a damper volume that fluidically connects the inflow and drive regions, allowing for efficient pressure pulsation damping and reduced bore lengths for improved damping and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a piston pump is used to generate high pressure in fuel, then high pressure (150-3000 bar) is achieved, but non-uniform delivery occurs causing pressure pulsations and vibrations
Solution Approach 1:
A low-pressure damper is introduced as an intermediary component between the fuel inlet and the pressure chamber. This damper absorbs pressure pulsations and volume flow fluctuations, smoothing the fuel delivery while maintaining the high-pressure generation capability of the piston pump.
Solution Approach 2:
The damping device utilizes hydraulic principles with a deformable membrane separating a gas volume from the fuel. The compressible gas acts as a cushion to absorb pressure variations, converting the harmful pressure pulsations into useful elastic energy storage and release.
2Stability of the object's composition
If a low-pressure damper is added to reduce pressure pulsations, then pressure stability is improved, but device complexity increases
Solution Approach 1:
The low-pressure damper is integrated into the pump housing structure, merging the damping function with the existing pump components. The damper volume is formed as part of the housing, eliminating the need for separate external damping components and reducing overall system complexity.
Solution Approach 2:
The pump housing serves multiple functions: it contains the pressure chamber, provides structural support, and incorporates the low-pressure damper volume. This multi-functionality reduces the number of separate components needed, simplifying the overall device while maintaining pressure stability.
3Object-generated harmful factors
If deformable damping devices with metal diaphragms are used, then pressure pulsations are reduced, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of complex metal diaphragm constructions, the patent uses flexible membrane structures that can be formed through conventional plastic injection molding. These thin-film membranes provide the necessary deformability for damping while being much easier and cheaper to manufacture.
Solution Approach 2:
The damping device incorporates composite construction with a plastic housing and integrated membrane structure. This combination of materials allows for complex damping functionality to be achieved through single-piece molding, eliminating the need for welding or assembly of multiple metal components.
4Object-generated harmful factors
If the damper volume is positioned to optimize damping, then pressure pulsation reduction is improved, but bore lengths increase affecting productivity
Solution Approach 1:
The damper volume is positioned in a three-dimensional arrangement within the pump housing, utilizing available space in multiple directions. This spatial optimization allows short bore lengths while maintaining effective damping by strategically placing the damper elements in the most efficient locations for pressure wave absorption.
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 reduces pressure pulsations and noise, ensures accurate fuel metering, and facilitates easier production by allowing for shorter, larger bore configurations and increased flexibility in component orientation, such as the 360° rotation of electrical connections, while maintaining effective damping properties.
Implementation Method 1
a damping device which operates as a hydraulic storage means which compensates for the fluctuations in the volume flow and therefore reduces the resulting pressure pulsations
Implementation Method 2
If the pressure, for example, in the inflow system increases, the deformable damping device deforms, as a result of which the gas volume is compressed and space is created for the excess fuel. If the pressure drops again at a later point in time, the gas in the gas volume expands again
Data Source
AI summary
Various embodiments may include a high-pressure fuel pump with: a pump housing including a pressure chamber and a pump piston movable up and down within the pressure chamber along a movement axis; and a low-pressure damper including a damper volume arranged on the pump housing and damper elements distributed symmetrically around a damper longitudinal axis. The damper longitudinal axis is arranged at an angle of between 5° and 175° in relation to the movement axis.