Rotatable Aperture Filter Assembly for Fuel Injector Cold Start Flow
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Solution Overview
Problem
Existing filter assemblies for fuel injectors restrict fluid flow at low temperatures, affecting cold start performance due to high viscosity and debris filtration limitations, leading to potential seizure and premature failure of moving parts.
Innovation Solution
A filter assembly comprising a first ring with apertures and a second ring misaligned concentrically, with an actuation mechanism and temperature sensor that aligns apertures to allow unfiltered flow based on fluid temperature, ensuring efficient filtration and flow regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is employed at the fluid inlet to limit debris entry, then the reliability of moving parts is improved, but the fluid flow is restricted at low temperatures
Solution Approach 1:
The filter assembly incorporates a rotatable second ring that can dynamically change its angular position relative to the first ring. At low temperatures, the rings are rotated to align apertures for unfiltered high-flow operation. At normal temperatures, the rings are positioned to misalign apertures for filtered operation, allowing the system to adapt its filtering intensity based on operating conditions.
Solution Approach 2:
The system changes the flow parameters by rotating the second ring to different angular positions. This mechanical parameter change (angular position) controls whether the apertures are aligned (high flow, unfiltered) or misaligned (restricted flow, filtered), enabling the system to switch between operational modes based on temperature conditions.
2Reliability
If a filter is employed to filter debris, then the reliability is improved, but the cold start performance deteriorates
Solution Approach 1:
The filter assembly uses a dynamic rotation mechanism that allows the second ring to be positioned at different angles. During cold starts, the mechanism rotates the rings to align apertures, providing unfiltered flow that ensures adequate fuel delivery. During normal operation, the rings are positioned to misalign apertures, providing filtered flow that protects against debris.
Solution Approach 2:
The filter assembly operates in periodic cycles: during cold start conditions, it provides unfiltered flow; after warming up, it switches to filtered flow mode. This periodic switching of operational states (filtered vs. unfiltered) based on temperature conditions optimizes both cold start performance and long-term reliability.
Data Source
AI summary
A filter assembly for a fuel injector is provided. The filter assembly includes a first ring. The first ring includes a plurality of first apertures provided along a circumference thereof. The filter assembly also includes a second ring disposed concentrically with respect to the first ring. The second ring includes a plurality of second apertures provided along a circumference thereof. Each of the plurality of second apertures is disposed misaligned with respect to each of the plurality of first apertures respectively. The filter assembly further includes an actuation mechanism operably coupled to the second ring. The actuation mechanism is adapted to selectively rotate the second ring about an axis with respect to the first ring to, at least partially, align each of the plurality of first apertures with respect to each of the plurality of second apertures respectively to provide an unfiltered flow of a fluid through the filter assembly.