Integrated Base Filter for DEF Manifold
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Solution Overview
Problem
Diesel exhaust fluid (DEF) delivery systems face issues with debris ingestion during refilling, leading to clogged orifices and interference with sensors, as debris can enter the pump and mix with the fluid, causing operational problems in SCR systems.
Innovation Solution
An integrated base filter within the DEF manifold that includes a cylindrical base filter with semi-cylindrical holder portions and tabs for secure mounting, preventing the DEF filter from collapsing and ensuring proper filtration, thus preventing debris from entering the system and maintaining accurate reductant level measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DEF filter is installed in the DEF reservoir to filter debris, then debris filtration is improved, but the filter may collapse under pump suction and interfere with the level float sensor
Solution Approach 1:
The filter support structure is segmented into multiple ribs radially spaced around the filter cartridge, providing distributed structural support to prevent collapse while allowing fluid flow through all segments of the filter surface
Solution Approach 2:
The support ribs extend in the axial dimension of the filter cartridge, providing structural support in the direction of pump suction pressure while maintaining filter effectiveness in the radial filtration direction
2Reliability
If the filter is positioned to effectively filter the DEF fluid, then filtration performance is improved, but the filter may interfere with the level float sensor operation
Solution Approach 1:
The level float sensor is extracted from the filter housing and mounted separately on the reservoir wall, eliminating interference between the filter structure and sensor operation while maintaining effective filtration
Solution Approach 2:
The filter support structure acts as an intermediary element that positions the filter cartridge in the optimal filtration location while the separate sensor mounting provides a clear path for level detection without obstruction
3Ease of manufacture
If a traditional filter mounting system is used, then installation is simple, but the filter may become dislodged or misaligned during operation
Solution Approach 1:
The filter support structure is merged with the reservoir wall through direct attachment of multiple support ribs to the reservoir, creating a unified structure that prevents dislodgement while maintaining simple filter cartridge installation
Solution Approach 2:
The support ribs serve multiple functions: providing structural support to prevent filter collapse, positioning the filter cartridge correctly, and anchoring the filter assembly to the reservoir wall against operational forces
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 base filter effectively prevents debris from entering the DEF delivery system, ensuring continuous operation of the SCR system by maintaining filter integrity and accurate reductant level measurements, thereby enhancing the reliability and efficiency of the emission control system.
Implementation Method 1
The first mounting tab and the second mounting tab may be circumferentially spaced about the first semi-cylindrical wall to align with and be inserted into the first mounting recess and the second mounting recess, respectively, of the boss outer surface
Implementation Method 2
The base filter may also include a second semi-cylindrical holder portion having a second semi-cylindrical wall with a second upper edge surface, the second semi-cylindrical wall concluding in a third abutment surface and a fourth abutment surface
Data Source
AI summary
A base filter for a diesel exhaust fluid (DEF) filter of a header assembly in a fluid reservoir is disclosed may include first and second semi-cylindrical holder portions having a semi-cylindrical walls concluding at abutment surfaces that face and engage when the base filter is assembled. The semi-cylindrical holder portions have one or more mounting tabs extending inward from inner surfaces of the semi-cylindrical walls. The header assembly may include a header with a cylindrical header boss having mounting recess defined therein. The mounting tabs may be circumferentially spaced about the semi-cylindrical walls to align with and be inserted into the mounting recesses of the header boss the base filter is assembled on the cylindrical header boss. Fasteners may be inserted through fastener bosses of the semi-cylindrical holder portions and into fastener bores of the header boss to hold the semi-cylindrical holder portions together and on the header.