Fuel Distributor Insertion Member for Rapid Water Injection Damping
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Solution Overview
Problem
Conventional fuel distributor rails for internal combustion engines face issues with reduced damping capacity due to a insert that reduces fillable volume and accumulates water, leading to segregation and frost damage, and result in longer delay times when switching between water-inclusive and exclusive operating modes.
Innovation Solution
A fuel injection system with an insertion member made of a thermoplastic material, such as polytetrafluoroethylene, that reduces hydraulic volume while maintaining compressibility, ensuring efficient damping and rapid water content adjustment by positioning the insertion member within the main body to create a hydrostatic stress state, allowing for reduced geometric dimensions and enhanced damping properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If an insertion member is placed in the cavity to reduce hydraulic volume and shorten delay time, then the delay time for water injection is reduced, but the damping capacity is reduced due to reduced fillable volume
Solution Approach 1:
The insertion member is made of elastomeric material whose modulus of compression is specifically selected to be lower than that of the fuel-water mixture. This parameter change allows the insertion member to provide compressibility and damping through its material properties rather than hydraulic volume, thus shortening delay time while maintaining damping capacity.
Solution Approach 2:
The system uses a composite approach by combining the rigid housing structure with a flexible elastomeric insertion member. The elastomeric material provides both the volume reduction needed for shorter delay time and the compressibility needed for damping, effectively combining two functions in one component.
2Loss of time
If the insertion member reduces hydraulic volume, then the delay time is shortened, but water accumulates in the reduced volume creating dead spaces
Solution Approach 1:
The elastomeric insertion member has inherent porosity and compressibility that prevents water from pooling in dead spaces. The material's cellular structure and ability to deform under pressure ensure water remains in continuous flow, eliminating accumulation issues while maintaining reduced hydraulic volume for short delay time.
Solution Approach 2:
By selecting elastomeric material with specific compressibility parameters, the insertion member creates a system where water is continuously pushed through the reduced volume without stagnation, solving both the delay time reduction and water accumulation problems simultaneously.
3Strength
If the insertion member is made of rigid material, then the structural strength is increased, but the compressibility and damping properties are reduced
Solution Approach 1:
The system combines rigid housing for structural strength with flexible elastomeric insertion member for compressibility. The rigid housing provides the necessary mechanical strength while the elastomeric insert provides the compressibility and damping properties that rigid materials cannot achieve.
Solution Approach 2:
Different parts of the system have different material properties optimized for their specific functions: the housing is rigid for structural support while the insertion member is elastomeric for compressibility and damping. This local differentiation of material quality allows both strength and compressibility requirements to be met simultaneously.
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
The solution achieves a short delay time for water injection, maintains efficient damping of pressure pulsations, and prevents water accumulation, ensuring reliable operation and reduced risk of frost damage, while allowing for smaller installation spaces and effective pressure build-up in fuel injection systems.
Implementation Method 1
positioning the insertion member within the main body to create a hydrostatic stress state
Implementation Method 2
maintaining compressibility, ensuring efficient damping and rapid water content adjustment
Implementation Method 3
maintains efficient damping of pressure pulsations
Data Source
AI summary
A component, which can be in the form of a fuel line or fuel distributor, is used for a fuel injection system, which is used for injecting fuel or a mixture of fuel and water having a variable water content. The component has a main body on which is provided a high-pressure inlet and at least one high-pressure outlet, the fuel, respectively the mixture being passable from the high-pressure inlet through an inner space of the main body to the least one high-pressure outlet, and an insertion member being configured in the inner space. The insertion member is at least partially made of at least a material having a modulus of compression specified to at least substantially correspond to or be lower than that of the fuel, respectively the mixture and/or lower than 30 GPa.