Fuel Rail Pulsation Dampening via Vortex Generation
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Solution Overview
Problem
Conventional pulsation dampening structures for fuel rails in vehicles fail to effectively reduce pulsation generated during fuel injection, leading to irregular injection and unstable engine output due to the generation of turbulent flows and vortices in the fuel delivery pipe.
Innovation Solution
A pulsation dampening structure for a fuel rail that includes a rail plug with a fuel reflecting part and a turbulent flow generating portion, which creates a vortex by reflecting and concentrating fuel flow, thereby reducing pulsation through the generation of turbulent flows and vortices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If fuel is continuously supplied into the fuel rail to maintain pressure during engine operation, then fuel pressure is maintained, but pulsation is generated due to the repetition of fuel injection and fuel supply
Solution Approach 1:
A pulsation dampening part is introduced as an intermediary component within the fuel rail. This dampening part absorbs and dissipates the pressure fluctuations caused by periodic fuel injection, acting as a mediator between the fuel supply system and the injection system to smooth out pulsation while maintaining overall fuel pressure
Solution Approach 2:
The fuel rail design modifies the physical parameters of the fuel flow path by incorporating a pulsation dampening part with specific geometry (such as expansion chambers or restrictive orifices). This changes the flow dynamics parameters, converting high-frequency pressure pulsations into lower-frequency, lower-amplitude fluctuations that are less harmful to injection precision
2Stress or pressure
If pulsation is generated in the fuel delivery pipe, then fuel pressure is maintained, but irregular injection occurs and engine output becomes unstable
Solution Approach 1:
The pulsation dampening part serves as an intermediary that isolates the injection system from pressure fluctuations in the fuel supply. By placing this dampening element between the fuel source and injectors, it filters out pulsation before the fuel reaches the injection points, ensuring stable and reliable fuel delivery
Solution Approach 2:
The design converts the harmful effect of pulsation into a beneficial smoothing effect. The pulsation dampening part utilizes the energy from pressure fluctuations to create a stabilizing effect, where the initial disturbance (pulsation) is transformed into a controlled, damped flow pattern that improves injection reliability
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 proposed structure effectively dampens pulsation by generating a vortex in the fuel rail, reducing flow velocity and minimizing the influence on fuel injection, resulting in improved engine stability and reduced irregular combustion.
Implementation Method 1
a fuel reflecting part disposed on the plug body in an inflow direction of the fuel and concavely formed in the inflow direction of the fuel such that the fuel entering along the fuel rail may be reflected and concentrated
Implementation Method 2
a turbulent flow generating portion provided in the fuel inflow direction of the fuel reflecting part to generate a vortex in the fuel reflected on the fuel reflecting part
Implementation Method 3
generate a vortex in the fuel reflected on the fuel reflecting part
Data Source
AI summary
The present disclosure relates to a pulsation dampening structure for a vehicle. The pulsation dampening structure includes a fuel rail, a rail plug disposed at an end portion of the fuel rail, and a pulsation dampening part disposed on the rail plug to dampen pulsation generated when fuel enters. A turbulent flow is caused by reflecting fuel which was entered, and a vortex is generated in the fuel, thereby dampening pulsation.