Fuel Injection Valve Movable Core Collision Control
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Solution Overview
Problem
Existing solenoid type fuel injection valves face challenges in accurately controlling fuel injection quantity and generating increased collision noise and potential damage due to the increased collision force of the movable core against the stopper element during the valve-closing operation.
Innovation Solution
A fuel injection valve design featuring a housing with a needle valve, coil, stationary core, movable core, first spring, and stopper, where the second spring's urging force is smaller than the first spring's, and a stopper limits the movable core's movement to reduce compression and collision force, enhancing control and reducing noise and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If both the first return spring and the second return spring urge the movable core toward the fuel injection hole during valve-closing operation, then the valve-closing speed is improved, but the movable core collides against the stopper element with increased force causing noise and potential damage
Solution Approach 1:
The harmful collision force is extracted and isolated by introducing a dedicated damper element between the movable core and stopper element. The damper absorbs and dissipates the collision energy through controlled deformation, separating the useful valve-closing function from the harmful collision effects.
Solution Approach 2:
The damper element is pre-installed in the compression state between the movable core and stopper element before valve-closing operation. This beforehand cushioning prepares the system to absorb collision energy, reducing the impact force when the movable core contacts the stopper element.
2Loss of time
If the movable core is urged by both springs toward the injection hole, then the valve-opening time period is shortened, but secondary valve-opening movement occurs due to increased collision force
Solution Approach 1:
The harmful collision force that causes secondary valve-opening movement is converted into a beneficial controlled energy dissipation process. The damper element transforms the harmful impact into useful damping action, allowing the movable core to stop smoothly against the stopper element without causing needle valve rebound.
Solution Approach 2:
The damper element acts as an intermediary between the movable core and stopper element. It mediates the interaction by absorbing and dissipating collision energy, preventing the direct transmission of harmful forces that would cause secondary valve-opening movement and injection quantity errors.
3Speed
If the second return spring has high urging force, then the movable core returns quickly to the closed position, but collision noise increases and damage to components may occur
Solution Approach 1:
The damper element is pre-compressed between the movable core and stopper element, preparing a cushioning mechanism before collision occurs. This beforehand cushioning reduces the impact noise when the movable core contacts the stopper element during rapid return.
Solution Approach 2:
The damper element serves as an intermediary that absorbs and dissipates collision energy through controlled deformation. This intermediary action reduces the transmission of collision forces to the stopper element and housing, thereby reducing collision noise.
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 and valve-closing responses, reduces secondary valve-opening movements, minimizes collision forces, and enhances durability by stabilizing the second spring's load and orientation, thus accurately controlling fuel injection and reducing operational noise.
Implementation Method 1
The coil generates a magnetic field in an energized state of the coil
Implementation Method 2
the movable core is magnetically attracted to the stationary core
Implementation Method 3
The first spring axially urges the needle valve toward the injection hole
Implementation Method 4
The second spring axially urges the movable core toward the stationary core with an urging force that is smaller than an urging force of the first spring
Data Source
AI summary
A first spring axially urges a needle valve toward an injection hole. A second spring axially urges a movable core toward a stationary core with an urging force that is smaller than an urging force of the first spring. A stopper is placed on one axial side of the movable core where the injection hole is located. The stopper limits movement of the movable core toward the injection hole to limit an amount of compression of the second spring.