Fuel Injector Noise Filter for Pressure Pulsation Damping
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Solution Overview
Problem
Fuel injection systems in internal combustion engines experience structure-borne noise due to hydraulic forces generated by fuel injectors, leading to undesirable sound radiation, particularly noticeable at engine idle speed.
Innovation Solution
A noise filtering device is integrated into the fuel injection system, engaging the upstream end of the fuel injector and providing a direct fluid connection between the fuel supply rail and the injector, while minimizing the effective area under system pressure and reducing fuel volume in the rail connector, thereby reducing pressure pulsations and noise propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional fuel injector is directly connected to the fuel supply rail, then fuel delivery is efficient, but structure-borne noise and pressure pulsations increase
Solution Approach 1:
A noise filtering device is introduced as an intermediary component between the fuel supply rail and the fuel injector. This device includes a restriction passage that filters pressure pulsations and noise while maintaining fuel delivery, thereby resolving the contradiction between efficient fuel delivery and noise reduction
2Productivity
If the fuel injector has a large effective area under system pressure, then fuel flow capacity is high, but pressure pulsations and noise propagation increase
Solution Approach 1:
The fuel delivery path is segmented into two stages: first through the noise filtering device's restriction passage which dampens pressure pulsations, then through the fuel injector. This segmentation allows the system to maintain high fuel flow capacity while reducing pressure pulsations and noise propagation
3Quantity of substance
If fuel volume in the rail connector is large, then fuel supply is adequate, but noise propagation and pressure pulsations are amplified
Solution Approach 1:
The noise filtering device acts as an intermediary that restricts and controls fuel flow, minimizing the fuel volume in the rail connector while ensuring adequate fuel supply to the injector. This reduces the amplification of noise propagation and pressure pulsations
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 noise filtering device effectively reduces structure-borne noise by minimizing pressure pulsations and their transfer to the engine structure, resulting in a quieter operation and improved sealing performance.
Implementation Method 1
The noise filtering device defines a restriction passage for directing fuel from the supply rail into the fuel injector
Implementation Method 2
A face seal is established at a transverse face adjacent the supply opening
Data Source
AI summary
A fuel injection system includes a fuel supply rail having a supply opening. A fuel injector is coupled to the fuel supply rail and configured to control the delivery of fuel from the fuel supply rail through the supply opening. A noise filtering device engages an upstream end of the fuel injector. The noise filtering device has a projecting portion extending at least partially into the supply opening along an axis, and the noise filtering device defines a restriction passage for directing fuel from the supply rail into the fuel injector. A face seal is established at a transverse face adjacent the supply opening.