Plunger Control Pin for Fuel Injection Solenoid Valve
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Solution Overview
Problem
Solenoid valves in fuel injection systems face challenges with high armature mass leading to time delays, mechanical vibrations, and noise due to inertia, which affect controllability and material wear.
Innovation Solution
Designing the armature as a plunger that also functions as the control pin, reducing mass and eliminating fixed connections with the closing element, allowing for reduced moving masses and lower switching times, thereby minimizing noise and material stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the armature is designed as a block-shaped element with large mass, then the valve can be actuated reliably, but the switching time increases and mechanical vibrations are generated
Solution Approach 1:
The armature is divided into two separate components: a plunger (control pin) and a closing element. The plunger has minimal mass for fast response, while the closing element handles the valve sealing function. This segmentation allows the lightweight plunger to achieve fast switching without compromising valve actuation reliability.
Solution Approach 2:
The control pin and plunger are merged into a single integrated component. The control pin serves dual functions as both the actuating element and the plunger, eliminating the need for a separate block-shaped armature and reducing overall moving mass while maintaining reliable valve control.
2Loss of time
If the armature mass is reduced, then the switching time decreases, but the armature may fail to actuate the valve reliably
Solution Approach 1:
By segmenting the armature into a lightweight plunger and a closing element, the system achieves fast switching with the plunger while maintaining reliable valve actuation through the closing element that directly engages with the valve seat.
3Force
If the armature mass is large, then the valve can be actuated with sufficient force, but mechanical vibrations and noise are generated
Solution Approach 1:
The segmentation of the armature into a lightweight plunger and closing element reduces the moving mass that generates vibrations and noise, while the closing element maintains sufficient actuation force for reliable valve operation.
4Reliability
If a block-shaped armature is used, then the valve can be actuated reliably, but the moving mass is very large
Solution Approach 1:
The armature is segmented into a minimal-mass plunger and a closing element, dramatically reducing the moving mass while maintaining reliable valve actuation through the closing element's direct engagement with the valve seat.
Solution Approach 2:
The control pin and plunger are merged into one component, eliminating the need for a separate block-shaped armature and achieving minimal moving mass while preserving reliable valve control functionality.
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
This design achieves lower moving masses, reducing noise and material stress, and enables faster switching times, improving controllability and efficiency in high-pressure fuel pumps.
Implementation Method 1
The actuator area (38) has a coil (46) which can induce electromagnetic forces in the plunger (48) so as to move the plunger (48) along the movement axis (40)
Implementation Method 2
the plunger (48) is formed of a ferromagnetic material or is at least partially coated with a ferromagnetic material
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a solenoid valve (28) for a fuel injection system (10), in which a closing element (34), which interacts with a valve seat (36) to close and open the solenoid valve (28), is actuated by a control pin (42), wherein the control pin (42) is formed by a plunger (48). The invention further relates to a high-pressure fuel pump (18) comprising such a solenoid valve (28).