Integrated Fuel Flow Limiter with Shutoff Piston and Filter
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Solution Overview
Problem
Pressurized fuel systems in internal combustion engines are sensitive to debris, leading to performance degradation and potential damage from small particles in the fuel, which existing filtration strategies have not adequately addressed.
Innovation Solution
A fuel flow limiter assembly with an integrated fuel filter is positioned between the pressurized fuel reservoir and fuel injectors, featuring a shutoff piston and biasing spring that moves based on fuel pressure to block flow when debris is detected, while the filter projects from the connector to filter fuel before it reaches the injectors, optimizing filtration and limiting fuel flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel is filtered upstream of the pressurized fuel reservoir, then debris is removed from fuel, but the system complexity increases and filtration effectiveness is reduced
Solution Approach 1:
The fuel filter is positioned to filter fuel before it enters the pressurized fuel reservoir, removing debris in advance. This preliminary filtration action prevents debris from entering the high-pressure system components, thereby protecting the fuel injectors and pump while maintaining system reliability without requiring additional complex filtration stages downstream
Solution Approach 2:
The patent combines the fuel reservoir and filtration system into an integrated assembly where the filter is housed within or directly associated with the reservoir structure. This merging of components reduces the overall system complexity by eliminating separate filtration housings and connections, while still achieving effective debris removal from the fuel
2Reliability
If fuel is filtered between the pressurized fuel reservoir and fuel injectors, then debris is removed, but the system complexity increases
Solution Approach 1:
The fuel filter is positioned in the fuel line between the pressurized fuel reservoir and the fuel injectors, performing preliminary filtration before fuel reaches the sensitive injector components. This placement ensures debris is removed in advance of potential damage points while maintaining a relatively simple single-stage filtration approach
Solution Approach 2:
The fuel filter acts as an intermediary component between the pressurized fuel reservoir and the fuel injectors, intercepting and removing debris from the fuel stream before it can reach the injectors. This intermediary filtration approach protects the injectors without requiring complex integrated filtration systems within the injector assembly itself
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 filters out debris and limits fuel flow to prevent performance degradation and damage, reducing the number of components needed and ensuring full fuel shutoff functionality, thereby enhancing the reliability and efficiency of the fuel system.
Implementation Method 1
a fuel filter supported in the connector. The fuel filter projects from the connector in the direction of the first axial body end in a fuel flow path from the fuel inlet to the fuel outlet
Implementation Method 2
a biasing spring trapped between the shutoff piston and the connector and biasing the shutoff piston toward the open position
Implementation Method 3
a sealing surface. The shutoff piston is movable within the central bore in a direction of the second axial body end from an open position, to a closed position where the sealing surface is in contact with the connector to block fuel flow from the fuel inlet to the fuel outlet
Data Source
AI summary
A fuel flow limiter assembly includes a limiter body forming a central bore, and including a shutoff piston within the central bore having a closing hydraulic surface exposed to a fluid pressure of the fuel inlet, and being movable from an open position, to a closed position based on a fuel pressure drop from a fuel inlet to a fuel outlet in the limiter assembly. A fuel filter is resident in the limiter assembly and supported in a connector coupled to the limiter body. The fuel filter is elongate and projects from the connector into a fuel flow path from the fuel inlet to the fuel outlet.