Fuel Injection Valve Flow Channel for Faster Opening Response
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Solution Overview
Problem
Conventional fuel injection valves face challenges in opening against high valve closing forces due to increased fuel pressure, leading to variations in valve opening timing and fuel injection amount, and may experience a linking phenomenon where the valve closing force transmission member fails to separate properly from the valve body, delaying the start of the valve opening operation.
Innovation Solution
A fuel injection valve design that includes a movable core attracted by a fixed core, a spring member for elastic deformation, and a valve closing force transmission member with a supply flow channel to prevent tight contact with the valve body, allowing for efficient fuel supply and reducing the delay in valve opening response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve closing force increases to counteract high fuel pressure, then the valve can remain closed reliably, but the valve opening force required increases and valve opening timing becomes delayed
Solution Approach 1:
The valve closing force transmission member is positioned in advance to contact the valve body at the start of movable core movement, ensuring immediate force transmission and preventing delay in valve opening operation
Solution Approach 2:
The valve closing force transmission member acts as an intermediary between the spring member and the valve body, efficiently transmitting the valve closing elastic force while maintaining proper separation to avoid linking phenomenon
2Force
If the valve closing force transmission member contacts the valve body tightly to transmit force effectively, then force transmission is efficient, but the member fails to separate properly causing linking phenomenon
Solution Approach 1:
The valve closing contact surface is designed with specific local properties (smoothness, area, position) to optimize both force transmission efficiency and separation characteristics, preventing sticking while maintaining effective force transfer
Solution Approach 2:
The contact conditions between the valve closing force transmission member and valve body are optimized by adjusting parameters such as contact surface area, contact pressure distribution, and surface finish to achieve both efficient force transmission and easy separation
3Stress or pressure
If fuel pressure increases to improve injection pressure, then injection effectiveness improves, but the valve closing force increases making valve opening more difficult
Solution Approach 1:
The electromagnetic coil and magnetic cores generate electromagnetic force to replace pure mechanical force systems, enabling the valve opening force to overcome the increased valve closing force from high fuel pressure more effectively
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 design improves valve opening response time, reduces variations in valve opening timing, and stabilizes fuel injection amounts by preventing the linking phenomenon and ensuring proper separation of the valve closing force transmission member, enhancing the valve's ability to operate effectively under high fuel pressure conditions.
Implementation Method 1
a fixed core that generates a magnetic attraction force upon energization of a coil
Implementation Method 2
a spring member that is elastically deformed by the valve opening operation of the valve body and exerts a valve closing elastic force
Data Source
AI summary
A fuel injection valve includes a valve body, a fixed core, a movable core, a spring, and a cup. The spring is elastically deformed according to valve opening operation of the valve body, and exerts a valve closing elastic force for closing the valve body. The cup contacts a valve closing contact surface of the valve body, and transmits the valve closing elastic force to the valve body. At a start of predetermined-distance movement of the movable core together with the cup, the cup is in contact with the valve closing contact surface, and the valve body or the cup has a supply flow channel through which fuel is supplied to the valve body closing contact surface which is in a state contacting the cup.