Fuel Pump Module Bypassing Filter for Cold Diesel Flow
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Solution Overview
Problem
Diesel engines experience poor starting and driving performance in low-temperature regions due to diesel fuel clotting and crystallization, which prevents smooth fuel supply through conventional fuel pump modules.
Innovation Solution
A fuel pump module design that includes a pump connection return passage to supply unconsumed diesel fuel back to the fuel pump without passing through a filter, and a valve to direct this fuel to the engine only when the fuel is below a certain temperature, ensuring it bypasses the filter and maintains fuel stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diesel fuel is filtered through a filter before reaching the fuel pump, then foreign objects are removed from the fuel, but fuel flow is blocked when the fuel clots and crystallizes in low-temperature regions
Solution Approach 1:
The invention divides the fuel supply system into two separate pathways: a first passage for filtered fuel supply to the fuel pump, and a second passage for unfiltered fuel supply as a backup. This segmentation allows the system to switch between filtered and unfiltered fuel paths depending on temperature conditions, resolving the contradiction between filter protection and fuel supply capability.
Solution Approach 2:
The invention changes the filtration parameter dynamically by providing both filtered and unfiltered fuel paths. When temperature drops and fuel clots, the system switches to the unfiltered second passage, bypassing the filter to maintain fuel flow. This parameter change resolves the contradiction between maintaining filter reliability and ensuring continuous fuel productivity.
2Reliability
If a return passage is added to supply unconsumed fuel back to the fuel pump, then fuel stability is maintained in low-temperature regions, but device complexity increases
Solution Approach 1:
The return passage is designed to serve multiple functions: it returns unconsumed fuel to the fuel pump inlet, provides a bypass for cold weather operation, and maintains fuel stability. By integrating this multi-functional passage into the existing fuel system, the invention achieves fuel stability improvement without proportionally increasing device complexity.
Solution Approach 2:
The return passage acts as an intermediary component that connects the fuel pump outlet back to the inlet, creating a circulation loop. This intermediary structure allows unconsumed fuel to be returned and mixed with fresh fuel, preventing clotting and maintaining stability without requiring major structural changes to the overall system.
3Productivity
If fuel is supplied directly to the fuel pump without filtering in cold weather, then fuel flow is maintained, but foreign objects may damage the fuel pump
Solution Approach 1:
The invention creates a dynamic fuel supply system where the filtration status can change based on operating conditions. The fuel pump can receive filtered fuel under normal conditions and unfiltered fuel when temperature drops and fuel clots. This dynamic adaptability resolves the contradiction between maintaining fuel supply flow and protecting the pump from foreign objects.
Solution Approach 2:
The system is designed with preliminary protective measures by providing both filtered and unfiltered paths before the fuel reaches the pump. When cold weather is detected, the unfiltered path is activated in advance to prevent fuel clotting, while the filter remains available as a protective barrier for normal operating conditions.
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
Ensures smooth starting and driving performance of diesel engines in low-temperature regions by preventing fuel loss and maintaining fuel stability, while reducing the risk of cavitation and improving initial starting performance.
Implementation Method 1
a spring 26 disposed at outside of the guide rod 25, a reservoir body assembly 20 disposed in the fuel tank, in which the guide rod 25 is formed to be slid inwardly of the reservoir body assembly 20 while guiding a motion of the spring 26, and the spring 26 is disposed between the flange assembly 10 and the reservoir body assembly 20 so that the reservoir body assembly 20 is disposed at the bottom of the fuel tank at all times
Implementation Method 2
a filter 28 for removing foreign objects included the fuel
Implementation Method 3
a fuel pump 27 for forced circulation
Data Source
AI summary
Provided is a fuel pump module for supplying diesel fuel. The fuel pump module in accordance with exemplary embodiments of the present invention is configured to include a flange assembly fixed to an inlet of a fuel tank and a reservoir body assembly disposed in the fuel tank, wherein the reservoir body assembly includes: a filter that removes foreign objects included in the diesel fuel; a fuel pump that forcibly circulates the diesel fuel passing through the filter to a diesel engine; and a pump connection return passage that supplies fuel toward a diesel engine through a supply line of fuel but supplies the diesel fuel that is returned without being consumed by the diesel engine between the filter and the fuel pump to supply the fuel to the fuel pump without passing through the filter.