Fuel Injector Filter With Integrated Orifice for Pressure Pulsation Control

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Solution Overview

Problem

Fuel injectors in internal combustion engines cause high-frequency pressure waves due to rapid opening and closing, leading to erratic fuel delivery, noise, and vibration, with existing solutions increasing system cost and complexity.

Innovation Solution

A restriction orifice is integrated into the fuel injector filter to break up pressure pulsations, reducing noise and vibration by intercepting fuel flow before it exits the injector.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a restriction orifice is placed in the fuel line leading to the injector (e.g., inside the jump tube), then pressure pulsations are reduced, but system cost and complexity increase

Engineering Contradiction:

Improvepressure pulsationsVSAvoidfuel system complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The restriction orifice is merged with the fuel filter assembly, combining two components (orifice and filter) into a single integrated unit. This eliminates the need for separate orifice installations in jump tubes or fuel lines, thereby reducing system complexity while maintaining pressure pulsation reduction functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The fuel filter assembly is given multiple functions: it both filters fuel and provides pressure pulsation reduction through the integrated restriction orifice. This multi-functionality eliminates the need for separate components, simplifying the overall fuel system while addressing the harmful pressure pulsations.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If a restriction orifice is placed in the fuel line leading to the injector, then pressure pulsations are reduced, but system cost increases

Engineering Contradiction:

Improvepressure pulsationsVSAvoidfuel system cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

By merging the restriction orifice with the fuel filter assembly, the invention eliminates the need for separate orifice components and installation steps. This integration reduces manufacturing costs through fewer parts and simplified assembly processes while maintaining the pressure pulsation reduction benefit.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The fuel filter assembly performs dual functions (filtration and pressure pulsation reduction), eliminating the need for separate orifice components. This multi-functionality reduces overall system cost by reducing the number of parts required and simplifying the supply chain.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 integrated restriction orifice effectively reduces or eliminates pressure pulsations, improving fuel delivery stability without adding cost or complexity to the fuel system.

Implementation Method 1

the restriction orifice breaks up and thus reduces the pressure pulsations

Methodology Applied

Scientific EffectPressure pulsation reduction through flow restriction: Pressure Drop

Data Source

PatentUS7617991B2Injector fuel filter with built-in orifice for flow restriction

Publication Date: 2009.11.17 PHINIA JERSEY HOLDINGS LLC

AI summary

Apparatus and method for substantially reducing or eliminating pressure pulsations caused by the opening and closing of fuel injectors. A preferred embodiment provides a restriction orifice adjacent the inlet end of a fuel injector filter of a respective fuel injector.