Self-damping Fuel Rail Movable Wall Design
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Solution Overview
Problem
Fuel rail pressure pulsations caused by sequential energization of fuel injectors lead to improper fuel distribution, increased tailpipe emissions, and vibration, and the use of damper elements increases installation time and cost.
Innovation Solution
A self-damping fuel rail design featuring an elongated tube with movable wall portions that change configuration in response to pressure changes, allowing for increased volume and damping of pressure pulsations without an additional damper element, reducing stress and assembly time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a damper element is used inside the fuel rail to minimize pressure pulsations, then pressure pulsations are effectively damped, but installation and assembly time increases and overall cost increases
Solution Approach 1:
The damping function is merged with the fuel rail structure itself. The movable wall portion is integrated into the fuel rail body, eliminating the need for a separate damper element. This integration allows the fuel rail to dampen pressure pulsations while reducing assembly steps and overall system complexity.
Solution Approach 2:
The fuel rail structure provides its own damping capability through the movable wall portion that responds automatically to pressure changes. The system is self-regulating, using the pressure pulsations themselves to drive the wall movement that creates the damping effect, without requiring external active control or additional components.
2Object-affected harmful factors
If a damper element is used inside the fuel rail to minimize pressure pulsations, then pressure pulsations are effectively damped, but overall cost increases
Solution Approach 1:
The damping function is merged with the fuel rail structure itself. The movable wall portion is integrated into the fuel rail body, eliminating the need for a separate damper element. This integration allows the fuel rail to dampen pressure pulsations while reducing assembly steps and overall system complexity.
3Object-affected harmful factors
If the wall portion is made movable to dampen pressure pulsations, then damping effect is achieved, but structural complexity increases
Solution Approach 1:
The movable wall portion acts as a flexible element within the fuel rail structure. This flexible section can deform in response to pressure changes, creating a simple yet effective damping mechanism that relies on the inherent elasticity and movement capability of the wall material rather than complex mechanical components.
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 self-damping fuel rail effectively reduces pressure pulsations, improves fuel distribution, and decreases assembly time and cost by eliminating the need for internal damper elements, while enhancing durability and fatigue life through optimized wall thickness and configuration.
Implementation Method 1
a first wall portion movable between a first position bowed inwardly toward the longitudinal axis when the self-damping fuel rail is in a non-operative state, and a second position moved outwardly away from the longitudinal axis when the self-damping fuel rail is in an operative state
Implementation Method 2
The wall defines a fuel passageway and has a first wall portion movable between a first position bowed inwardly toward the longitudinal axis
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
A self-damping fuel rail for a fuel-injected internal combustion engine includes an elongated tube defining a wall and having a longitudinal axis. The wall defines a fuel passageway and has a first wall portion movable between a first position bowed inwardly toward the longitudinal axis when the self damping fuel rail is in a non-operative state, and a second position moved outwardly away from the longitudinal axis when the self-damping fuel rail is in an operative state. The self-damping fuel rail also includes at least one fuel outlet configured to facilitate communication between the fuel passageway and a fuel injector.