Fuel Pressure Regulator Segmented Flow Path
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Solution Overview
Problem
Existing fuel pressure regulation systems in heavy-duty diesel engines have a short working life due to high flow rates through fine mesh filters, leading to premature pressure drop and potential cross-contamination and damage from contaminated fuel, which reduces system efficiency and longevity.
Innovation Solution
A fuel pressure regulator design with a control fuel line and a spill line connected at strategic points to manage fuel flow, incorporating a leak passageway and expansion volume to minimize debris entry and maintain pressure control, preventing cross-contamination and extending filter life by reducing flow through fine mesh filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spill line is located downstream of the fine mesh filters, then the fuel pressure can be regulated, but the flow rate through the fine mesh filters increases, reducing their working life
Solution Approach 1:
The fuel regulation system is segmented into two separate pathways: a control fuel line that supplies clean fuel to the regulator's control chamber, and a spill line that handles the high-flow recirculation. This segmentation allows the fine mesh filters to only process the small control fuel flow, extending their life while maintaining regulation function.
Solution Approach 2:
A dedicated control fuel line acts as an intermediary, providing a separate clean fuel supply to the regulator's control chamber. This intermediary pathway prevents the high-flow contaminated fuel from passing through the fine mesh filters, thereby extending filter life while maintaining regulation capability.
2Power
If the spill line handles high flow rates, then pressure regulation is effective, but contaminated fuel can cause debris damage and seizure of the regulator
Solution Approach 1:
The regulator is segmented into two functionally separate pathways: a control fuel line for clean fuel that actuates the valve, and a spill line for high-flow recirculation that bypasses the fine mesh filters. This segmentation protects the regulator mechanism from debris while maintaining effective pressure control through the high-capacity spill pathway.
Solution Approach 2:
The control fuel line serves as an intermediary, delivering clean fuel to the regulator's control chamber to operate the valve mechanism. This intermediary clean fuel supply prevents contaminated fuel from contacting and damaging the regulator's internal components, thereby improving durability while maintaining regulation power.
3Reliability
If all pumped fuel passes through fine mesh filters, then complete filtration is achieved, but the pressure drop across filters increases quickly, reaching maximum allowable pressure drop sooner
Solution Approach 1:
The fuel flow is segmented into two streams: a small control fuel stream that passes through the fine mesh filters for complete filtration, and a large spill stream that bypasses the fine mesh filters. This segmentation reduces the total flow through the filters to only what's necessary for control purposes, extending service life while maintaining adequate filtration for the regulated fuel supply.
Solution Approach 2:
Instead of filtering all pumped fuel through the fine mesh filters, the system applies partial filtration only to the control fuel line flow. This partial action is sufficient to protect the high-pressure pump and maintain regulation function, while avoiding the excessive pressure drop that would result from filtering the entire fuel flow, thereby extending filter service life.
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 extends the working life of fuel filters, maintains precise pressure control, and prevents damage from contaminants, ensuring reliable engine operation and cost savings by reducing the need for frequent replacements.
Implementation Method 1
any fuel entering the bore through the control fuel line connection acts upon a thrust surface provided on the valve member resulting in a force acting on the valve member
Implementation Method 2
acts upon a thrust surface provided on the valve member resulting in a force acting on the valve member
Implementation Method 3
a fuel flow path from the fuel spill line connection to the fuel return line connection is kept open when the fuel pressure regulator is in the non-regulating position
Implementation Method 4
a spring member located within the bore and biased in a direction to close the fuel pressure regulator
Data Source
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AI summary
A fuel pressure regulator (1,201) for a compression ignition diesel engine. The regulator (1, 201) comprises a bore (5,205) within which is located a valve member (3,203) that is moveable from a non-regulating position to a regulating position. In a non-regulating position a first end (11,211) of the bore (5,205) is closed. In a regulating position the first end of the bore (5,205) is open. A control fuel line connection (8,208) is positioned at a second end (9,209) of the bore (5,205), such that, in use, any fuel entering the bore (5,205) through the control fuel line connection (8,208) acts upon a thrust surface (12,212) provided on the valve member (3,203) resulting in a force acting on the valve member (3,203) in a direction to open the fuel pressure regulator (1,201). There is provided an upper clearance (6,206) between the valve member (3,203) and the second end (9,209) of the bore (5,205), and a fuel spill line connection (13,213) positioned in the bore (5,205) such that, in use, any fuel entering the bore (5,205) through the fuel spill line connection (13,213) enters a region between the first end (11,211) and the second end (9,209) of the bore (5,205). A lower clearance(30,230) is provided in the bore (5,205) between the first end (11,211) and the second end (9,209), and a leak passageway is connected from a point between the lower clearance(30,230) and the second end (9,209) of the bore (5,205), and a fuel return line connection (14,214), such that, in normal operating use, a fuel flow path from the fuel spill line connection (13,213) to the fuel return line connection (14,214) is kept open when the fuel pressure regulator (1,201) is in the non-regulating position.