Fuel Pump Module Guide Wall Stabilizes Return Fuel Flow
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Solution Overview
Problem
In LPG vehicles, the fuel returned from the engine to the tank during acceleration often flows obliquely due to inertia, leading to instability in fuel supply to the engine as the fuel may not drop vertically into the reservoir cup, resulting in potential engine stoppage due to low fuel.
Innovation Solution
The fuel pump module incorporates a guide wall and channel on the shaft bracket to direct return fuel flowing through the tank into the reservoir cup, ensuring stable collection even during vehicle acceleration, without the need for a fuel-resistant fluoro-rubber hose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If return fuel is allowed to flow freely in the tank during vehicle acceleration, then the fuel can move with the vehicle motion, but the fuel flows obliquely rearward due to inertia and drops outside the reservoir cup, causing unstable fuel supply
Solution Approach 1:
The patent introduces a guide wall as an intermediary structure between the return fuel flow and the reservoir cup. The guide wall mediates the interaction by redirecting the obliquely flowing fuel back toward the reservoir cup opening, ensuring that even during vehicle acceleration, the fuel is guided into the reservoir cup rather than dropping outside it.
Solution Approach 2:
The guide wall extends in the vertical dimension from the bottom of the tank upward, creating a three-dimensional flow path control structure. This vertical extension allows the guide wall to intercept fuel flowing obliquely in the horizontal plane and redirect it vertically downward into the reservoir cup, effectively managing fuel flow in multiple dimensions simultaneously.
2Reliability
If a fuel-resistant fluoro-rubber hose and separate line parts are used to guide return fuel into the reservoir cup, then fuel supply stability can be achieved, but the manufacturing cost increases
Solution Approach 1:
The patent merges the functions of the guide wall, shaft bracket, and fuel guiding structure into a single integrated metal bracket component. This consolidation eliminates the need for separate fluoro-rubber hoses and multiple line parts, reducing both the number of components and assembly steps while maintaining the fuel supply stability function.
Solution Approach 2:
The patent replaces the flexible hose solution with a rigid metal bracket structure that copies the fuel-guiding function. The metal bracket with its integrated guide wall and channel reproduces the fuel directing capability of the hose system but with the advantages of structural integrity, durability, and manufacturing efficiency.
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 stabilizes fuel supply to the engine by ensuring return fuel is consistently collected in the reservoir cup, preventing engine stoppage due to fuel shortages and reducing manufacturing costs by eliminating the need for additional hoses and separate line parts.
Implementation Method 1
when a vehicle accelerates, as shown in FIG. 1, the fuel returned from the tank 1 flies, i.e., is forced rearward in the direction opposite to the traveling direction of the vehicle (see 'B'). That is to say, the fuel flowing in the tank 1 through the return valve obliquely drops rearward and downward, rather than falling or dropping vertically, due to acceleration of the vehicle and the resultant inertia.
Implementation Method 2
the fuel returned in the tank is supplied in a manner so that the fuel vertically drops into the reservoir cup 2 due to gravity and its own weight
Data Source
AI summary
A fuel pump module for a vehicle includes: a pump positioned in a reservoir cup in a tank to suction and discharge fuel from the reservoir cup; a mount plate mounted in an opening of the tank; a return valve installed on the mount plate to pass return fuel, which is returned from an engine, into the tank; a guide wall disposed at a lower side of the mount plate to guide return fuel flowing in the tank through the return valve; and a channel disposed at the lower side of the mount plate so that return fuel guided by the guide wall flows down and configured to discharge the return fuel, which flows down, into the reservoir cup. The guide wall blocks return fuel, which flows in the tank, from spraying or dispersing laterally when a vehicle, which includes the fuel pump module, accelerates.