Fuel Injection Device Magnetic Actuation Spring Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel injection devices suffer from energy loss and difficulty in controlling fuel injection due to pilot injection, which can lead to increased fuel consumption and vibration-induced damage to springs.
Innovation Solution
A fuel injection device design that magnetically attracts a movable element and main valve to the stator side, eliminating the need for pilot injection and using a second spring to push the main valve, thereby increasing the lift amount without energy loss and preventing spring vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If pilot injection is performed to increase main valve lift amount, then the main valve lift amount increases, but fuel pressure decreases causing energy loss
Solution Approach 1:
The movable element is divided into two separate components: the core that responds to magnetic force and the main valve. This segmentation allows the core to be attracted to the stator without requiring pilot injection, directly increasing the main valve lift amount while avoiding energy loss from pressure reduction.
Solution Approach 2:
The patent replaces the mechanical pilot injection system with a magnetic field-based actuation system. The coil generates a magnetic field that directly attracts the movable element core, eliminating the need for pilot injection and its associated energy losses while achieving the desired main valve lift.
2Length of moving object
If pilot injection is performed before main valve opening, then main valve lift amount increases, but control of fuel injection becomes difficult
Solution Approach 1:
The patent merges the core movement and main valve opening into a single unified action. When the coil is energized, the movable element core is attracted to the stator, and this same magnetic force directly opens the main valve simultaneously, eliminating the separate pilot injection phase and simplifying control.
3Force
If spring is provided on outer radius side of main valve, then main valve is pushed to stator side, but spring vibrates and may break
Solution Approach 1:
The patent extracts the spring from the fuel flow path by positioning it on the outer radius side of the main valve, separate from the fuel passage. This removes the source of vibration caused by fuel flow while preserving the spring's necessary pushing function to return the main valve to the closed position.
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 allows for a substantial increase in fuel injection amount linearly with energization time without energy loss and prevents spring vibration, enhancing fuel efficiency and reliability.
Implementation Method 1
a coil generating a magnetic field when energized
Implementation Method 2
the movable element alone is magnetically attracted to the stator side by cancelling pushing forces of the first pushing portion and the second pushing portion
Data Source
AI summary
A fuel injection device includes a coil, a stator provided on an inner side of the coil, a housing including an injection hole at an end opposite to a stator side in an axial direction, a movable element including a movable element main body that generates a first gap with the stator and a stopper portion provided to an injection hole side of the movable element main body, and provided inside the housing in a reciprocable manner, a main valve including a lock portion that generates a second gap smaller than the first gap together with an end face of the stopper portion on the stator side, and provided to open and close the injection hole, a first pushing portion constantly pushing the movable element to the injection hole side, and a second pushing portion constantly pushing the main valve to the stator side.