High-Pressure Fuel Pump Pressure Relief Layout for Damper Wear
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Solution Overview
Problem
The existing high-pressure fuel pumps suffer from excessive mechanical load on the pressure damper due to pressure pulsations passing through the pressure relief valve, leading to wear and noise, and impair the damper's ability to dampen pressure pulsations effectively.
Innovation Solution
The pressure limiting valve connects the high-pressure area with the inlet valve area of the low-pressure area, allowing fuel to flow from the high-pressure area into the inlet valve area when the pressure difference exceeds a certain threshold, utilizing an electromagnetic actuator to control the inlet valve, and optimizing the alignment and design of the pressure relief and outlet valve bores for easier machining and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the pressure relief valve connects the high-pressure area to the receiving chamber of the pressure damper, then the pressure limiting function is achieved, but excessive mechanical load and wear occur on the pressure damper
Solution Approach 1:
The patent extracts the pressure relief function from the pressure damper system by providing a separate pressure relief valve that discharges directly to the low-pressure area, preventing pressure pulsations from reaching the pressure damper and causing wear
Solution Approach 2:
The patent segments the pressure relief function and pressure damping function into separate systems: the pressure relief valve handles overpressure protection by discharging to low-pressure area, while the pressure damper handles pressure pulsation damping in the low-pressure area, preventing mechanical load on the damper
2Stress or pressure
If the pressure relief valve connects the high-pressure area to the receiving chamber of the pressure damper, then pressure relief is achieved, but noise generation increases
Solution Approach 1:
The patent extracts the noise-generating pressure pulsations from the pressure damper system by providing a separate discharge path to the low-pressure area, eliminating the harmful noise while maintaining pressure relief function
3Stress or pressure
If the pressure relief valve connects the high-pressure area to the receiving chamber of the pressure damper, then pressure relief is achieved, but the pressure damper's ability to dampen pressure pulsations is impaired
Solution Approach 1:
The patent segments the pressure relief function and pressure damping function into separate systems, allowing the pressure damper to focus solely on damping pressure pulsations in the low-pressure area without being subjected to high-pressure loads that would impair its damping ability
4Volume of moving object
If the outlet valve bore and pressure relief valve bore are arranged non-parallel, then space utilization is improved, but machining complexity increases
Solution Approach 1:
Instead of optimizing for space utilization with non-parallel bores, the patent inverts the approach by arranging bores parallel to each other, prioritizing manufacturing ease and simplicity over maximum space utilization
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 design minimizes mechanical stress and wear, reduces noise generation, and enhances the damper's effectiveness in damping pressure pulsations, while simplifying the manufacturing and assembly process of the high-pressure fuel pump.
Implementation Method 1
an electromagnetic actuator of the high-pressure fuel pump which acts on the inlet valve via a plunger
Data Source
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AI summary
A high-pressure fuel pump (10) having an inlet valve (14) and a pressure-limiting valve (22) which fluidically connects a high-pressure region (29) to an inlet valve region (28c) located, in terms of geometry, between the inlet valve (14) and an electromagnetic actuator (30) of the high-pressure fuel pump (10), which acts upon the inlet valve (14) via a tappet (31).