Fuel Injection Valve Separation Ring Flux Management
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Solution Overview
Problem
Existing fuel injection valves for internal combustion engines face challenges in achieving precise control over the opening and closing of the nozzle orifice, which affects power output, fuel consumption, and emissions, due to limitations in magnetic flux management and material compatibility with fuel.
Innovation Solution
A fuel injection valve design incorporating a separation ring with two magnetic material parts, where the first part is ferromagnetic and the second part is a permanent magnetic material, arranged to guide the electromagnetic flux and separate the magnetic coil from the fuel path, enhancing magnetic performance and preventing fuel leakage, while using compatible materials for the ferromagnetic part to withstand fuel exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-material separation ring is used, then the structure is simple, but the magnetic performance is insufficient and material compatibility with fuel is compromised
Solution Approach 1:
The separation ring is divided into two distinct parts: a first part made of ferromagnetic material for guiding magnetic flux, and a second part made of fuel-compatible material for sealing and chemical resistance. This segmentation allows each part to perform its specific function optimally without compromise.
Solution Approach 2:
The separation ring combines two different materials with complementary properties: ferromagnetic material provides magnetic flux guidance while the fuel-compatible material provides chemical resistance and sealing. This composite structure resolves the contradiction between magnetic performance and material compatibility.
2Reliability
If the magnetic coil is placed close to the armature for efficient flux transfer, then magnetic performance improves, but fuel leakage risk increases due to compromised sealing
Solution Approach 1:
The separation ring acts as an intermediary component between the magnetic coil assembly and the fuel path. It provides a magnetic flux path while simultaneously maintaining fuel sealing, allowing the magnetic coil to be positioned for optimal performance without compromising leak prevention.
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 design improves the magnetic performance and operational reliability of the fuel injection valve, allowing it to handle high fuel pressures and maintain sealing integrity, while minimizing the risk of material damage from chemical reactions with fuel, thereby optimizing power output and reducing emissions.
Implementation Method 1
a magnetic coil which is chargeable by electricity to generate a magnetic flux
Implementation Method 2
a magnetisable armature which may be combined with a valve needle, will be stimulated for movement
Implementation Method 3
the housing comprises a separation ring being positioned between the armature and the coil casing and being configured to lead the electromagnetic flux to the armature
Implementation Method 4
a valve spring is positioned in the fuel injection valve, which urges the valve needle against the nozzle orifice
Data Source
AI summary
A fuel injection valve includes a housing with a cavity, a valve needle, an actuator including a magnetic coil arranged in a coil casing, and an armature in the cavity. The housing includes a separation ring positioned between the armature and the coil casing and configured to lead the electromagnetic flux to the armature. The separation ring includes a first part and a second part. The first part is made of a first material and the second part is made of second material that differs from the first material. The first material and the second material are magnetic materials.