Fuel Injector Cleaning Fluid Passage for Deposit Prevention
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Solution Overview
Problem
Fuel injectors in internal combustion engines face issues with blockages due to combustion product deposits and fuel accumulation, particularly with biomass-derived fuels, leading to reduced fuel flow and potential malfunction.
Innovation Solution
A fuel injector design featuring a valve member, valve member guide, spring chamber, and separate fuel and cleaning fluid supply passages, where the cleaning fluid is used to restrict fuel leakage and prevent deposits by creating a pressurized flow that diverts fuel away from the spring chamber, ensuring efficient operation and maintenance diagnostics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fuel is supplied through the spring chamber, then the fuel flow path is simplified, but fuel leakage accumulates in the spring chamber causing deposit formation and blockages
Solution Approach 1:
The fuel flow path is segmented into separate zones: the spring chamber is isolated from the main fuel supply, and a dedicated drainage passage provides a separate escape route for leakage fuel. This segmentation prevents fuel accumulation in the spring chamber while maintaining a relatively simple overall structure.
Solution Approach 2:
The harmful effect of fuel leakage accumulation is extracted by providing a dedicated drainage passage that removes fuel from the spring chamber. This extraction mechanism prevents deposit formation without requiring complete redesign of the fuel supply system.
2Object-affected harmful factors
If the valve member clearance is reduced to prevent fuel leakage, then deposit formation is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The drainage passage acts as an intermediary mechanism that provides a controlled escape route for fuel leakage. Instead of relying solely on tight clearances, the drainage passage mediates the fuel flow, allowing larger clearances while preventing harmful accumulation and deposits.
3Object-generated harmful factors
If cleaning additives are flooded through the fuel injector, then combustion product deposits are removed, but fuel deposits may still accumulate in hard-to-reach areas
Solution Approach 1:
The drainage passage provides preliminary action by continuously removing fuel leakage before it can accumulate and form deposits in the spring chamber. This preventive measure works in conjunction with cleaning additives to comprehensively address both combustion product and fuel deposits.
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 enhances the reliability and durability of fuel injectors by preventing deposit formation and allowing for effective maintenance through monitoring of the cleaning fluid flow, thereby reducing the likelihood of jamming and ensuring consistent fuel delivery.
Implementation Method 1
the spring chamber containing a biasing member which biases the valve member into contact with the valve seat
Implementation Method 2
configured to supply a pressurised cleaning fluid to the second end of the bore to restrict leakage of the fuel from the outlet chamber towards the second end of the bore along a clearance extending between the valve member and the valve member guide
Data Source
AI summary
A fuel injector is provided which has a valve member, a valve member guide and a spring chamber. Discharge of fuel out of a fuel injector outlet is controlled by movement of the valve member within a bore of the valve member guide. The spring chamber contains a biasing member, which is a compression spring, and which biases the valve member into contact with a valve seat when in a closed configuration. The fuel supply passage is provided, which by-passes the spring chamber, to direct a flow of the fuel to an outlet chamber of the fuel injector, and the cleaning fluid supply passage is provided to supply a pressurized cleaning fluid to a second end of the bore to restrict leakage of the fuel from the outlet chamber towards the second end of the bore along a clearance extending between the valve member and the valve member guide.