Fuel Pump Module Antistatic Filter Grounding
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Solution Overview
Problem
Conventional fuel pump modules face issues with static electricity generation in fuel filters due to friction, leading to potential electrification and contamination of fuel with conductive particles when using carbon-based ground lines, especially when the fuel pump and filter are housed together.
Innovation Solution
A fuel pump module design with separate housings for the pump and filter, incorporating an antistatic unit made of conductive material connected to ground within the filter housing, which prevents electrification by directing static charges to ground, even when the filter is made of insulating material or not directly connected to the ground line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter is electrically connected to ground using a conductive material including carbon particles, then the stored electricity in the filter can be discharged to ground, but the carbon particles may be mixed into the fuel causing contamination
Solution Approach 1:
The filter housing is divided into separate sections: the filter element, the housing structure, and the ground connection path. This segmentation allows the filter element to remain electrically isolated while the housing provides a separate ground connection path, preventing carbon particles from contaminating the fuel while still enabling electrification prevention.
Solution Approach 2:
The filter housing acts as an intermediary component between the filter element and ground. Instead of directly connecting the filter element to ground (which would require carbon particles in the fuel path), the housing serves as a mediator that provides an alternative ground connection path, eliminating the need for carbon-based conductive materials in the fuel stream.
2Object-affected harmful factors
If the fuel pump and filter are housed in two separate housings, then the filter can be independently grounded, but the electricity stored in the filter cannot be discharged through the pump to ground
Solution Approach 1:
The filter element and the ground connection are merged into a single integrated filter assembly. The filter housing includes both the filter element and the ground connection structure, ensuring that the filter element is electrically connected to ground through the housing. This merging ensures that even when the pump and filter are in separate housings, the filter can still discharge stored electricity to ground through its own integrated ground connection path.
3Object-affected harmful factors
If the filter is made of insulating material, then carbon particle contamination is avoided, but the filter cannot be electrically connected to ground
Solution Approach 1:
The filter assembly is segmented into the filter element (made of insulating material) and the housing (which provides electrical connection). This segmentation allows the filter element to remain electrically isolated and free from carbon particle contamination, while the housing provides a separate electrical path to ground, enabling both contamination prevention and electrification prevention simultaneously.
Solution Approach 2:
The filter housing serves as an intermediary that bridges the electrical connection gap created by using insulating filter material. The housing includes conductive elements that connect to ground, providing an electrical path without requiring the filter element itself to be conductive. This intermediary structure enables ground connection while maintaining the insulating properties of the filter element.
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
Effectively prevents filter electrification and contamination by ensuring static charges are dissipated to ground, maintaining fuel quality and reducing the risk of conductive particle contamination, while allowing for independent housing of the pump and filter.
Implementation Method 1
an antistatic unit housed in the first filter housing, made of a conductive material, and connected to a ground. The antistatic unit prevents electrification of the first filter
Implementation Method 2
when the fuel passes through the filter, static electricity is generated due to friction between the fuel and the filter. Therefore, the filter is electrically connected with a conductive member that discharges the stored electricity in the filter to other parts
Implementation Method 3
when the fuel passes through the filter, static electricity is generated due to friction between the fuel and the filter
Data Source
AI summary
A fuel pump module for a fuel tank prevents electrification of a filter within the fuel pump module. A port injection filter is housed in a filter case that is separate from a pump case that houses a port injection fuel pump. A ground bracket housed in the filter case includes a cylinder part, a first connection part, and a second connection part, which are formed as a single body and made of conductive resin. The cylinder part is disposed inside of the port injection filter. The second connection part is disposed on an opposite side of the bracket relative to the first connection part, where the first connection part is connected with the cylinder part, for the connection to the ground through a ground line. As a result, a static electricity caused by friction of fuel flowing through the filter is discharged to the ground.