Integrated DEF Tank Grommet Filter to Prevent Debris Washover
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Solution Overview
Problem
Current diesel engine exhaust aftertreatment systems face issues with the return of unused clean diesel exhaust fluid (DEF) to unfiltered areas of the tank, leading to potential damage and reduced filter life due to the lack of an integrated filtration system that prevents debris washover.
Innovation Solution
An integrated grommet filter system is introduced, comprising a non-permeable flexible grommet with a cylindrical skirt and sock filter, where the grommet is integrally connected to the filter, forming a single piece that prevents debris overwash and includes a gasket for secure installation, ensuring clean DEF is retained within the clean section of the tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate filter and gasket are installed in the DEF tank, then the filtration function is provided, but the device complexity increases and maintenance becomes more difficult
Solution Approach 1:
The patent combines the grommet and filter into a single integrated component. The filter is attached to the grommet, forming one piece that performs both sealing and filtration functions simultaneously. This eliminates the need for separate filter holders and visual confirmation mechanisms, directly reducing device complexity while maintaining reliable filtration.
2Reliability
If a mechanical clamp is used to install the filter, then the filter is secured in place, but the ease of manufacture and installation is reduced
Solution Approach 1:
The filter is integrated directly onto the grommet during manufacturing, eliminating the need for separate installation steps involving mechanical clamps. The integrated design allows the entire assembly to be installed as one unit, simplifying both the manufacturing process and field installation while ensuring reliable securing through the grommet's natural sealing properties.
3Productivity
If unused clean DEF is returned to the unfiltered part of the tank, then the system operates continuously, but debris washover occurs and filter life is reduced
Solution Approach 1:
The integrated grommet filter creates distinct clean and dirty zones within the tank by positioning the filtration element at the return line entry point. This segmentation prevents debris washover by filtering DEF before it re-enters the clean storage area, allowing continuous operation while extending filter life through proper debris separation.
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 solution effectively prevents debris from contaminating the clean DEF, extends filter life, and simplifies maintenance by eliminating the need for separate filter holders and visual confirmation of filter presence, thereby reducing the risk of damage and improving system efficiency.
Implementation Method 1
an integrated grommet filter comprising a grommet integrally connected to a sock filter
Data Source
AI summary
A diesel engine aftertreatment system is disclosed. The aftertreatment system includes a diesel exhaust fluid (DEF) injection system including a selective catalytic reduction (SCR) device, a DEF tank connected to the SCR device, a DEF injection device installed in the tank, and an integrated grommet filter. The integrated grommet filter includes a grommet having a top gasket portion and a bottom cylindrical skirt portion. The cylindrical skirt portion is integrally connected to a sock filter. In an embodiment, the integral connection between the skirt portion and the sock filter includes an overlap and stitching. In an embodiment, the gasket is a star shaped gasket.