Magnetized Fuel Injector Valve Reduces Bouncing
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Solution Overview
Problem
Fuel injectors in combustion engines experience bouncing of moving parts, leading to fuel leakage, particulate matter formation, fuel metering issues, and increased wear, which affects performance and emissions.
Innovation Solution
A fuel injector with a permanently magnetized valve mechanism and/or seat, utilizing a spring bias and an injector driver circuit to control the valve movement, reducing bouncing through magnetic attraction and reversing current polarity to manage closing speeds and reduce stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional valve mechanism is used without magnetic attraction, then the structure is simpler, but bouncing occurs leading to fuel leakage and increased wear
Solution Approach 1:
The patent replaces purely mechanical valve closure with a magnetic field-based closure system. A magnet is positioned near the valve mechanism to provide magnetic attraction force that pulls the valve closed, eliminating the need for complex mechanical spring systems and reducing bouncing. This substitution of mechanical closure with magnetic attraction directly addresses the technical contradiction by improving sealing reliability while managing structural complexity through a different physical mechanism.
Solution Approach 2:
The patent changes the physical state or properties of the valve system by introducing magnetic properties. By incorporating a magnet into the valve mechanism or nearby structure, the system utilizes magnetic field strength as a controllable parameter to manage valve closure force and reduce bouncing. This parameter change from purely mechanical to electromagnetic interaction resolves the contradiction between reliability and complexity.
2Reliability
If the valve closes quickly without magnetic damping, then response time is faster, but bouncing increases causing fuel leakage and tick noise
Solution Approach 1:
The patent substitutes mechanical damping mechanisms with magnetic field-based damping. The magnetic attraction force provides a damping effect during valve closure, reducing bouncing and oscillations without requiring additional mechanical dampers or complex spring systems. This allows the valve to close quickly while minimizing rebound, resolving the contradiction between response time and fuel leakage prevention.
Solution Approach 2:
The magnetic field acts as an intermediary force between the electrical actuation signal and the mechanical valve motion. By using magnetic attraction as the intermediate mechanism, the system achieves smooth valve closure with reduced bouncing, mediating between the fast electrical response and the mechanical valve movement to prevent fuel leakage while maintaining quick response.
3Speed
If high spring force is used to close the valve, then closing speed increases, but wear on contact surfaces increases and tick noise increases
Solution Approach 1:
The patent replaces high-force mechanical spring closure with magnetic field-based closure. The magnetic attraction force provides a more gradual and controlled closing action compared to high-force mechanical springs, reducing impact forces and bouncing. This substitution eliminates the need for high spring forces while maintaining fast closing speed, thereby reducing tick noise and wear on contact surfaces.
Solution Approach 2:
The magnetic field provides a cushioning effect during valve closure by creating a gradual attraction force that reduces impact. The magnetic force acts beforehand to guide the valve closure smoothly, cushioning the impact before the valve fully contacts the seat. This beforehand cushioning reduces tick noise and wear while maintaining fast closing speed.
4Adaptability or versatility
If the injector operates at high frequency for split injections, then injection flexibility increases, but bouncing prevents quick reopening
Solution Approach 1:
The patent replaces mechanical valve holding mechanisms with magnetic field-based valve control. The magnetic field can be rapidly switched on and off to control valve opening and closing, enabling quick reopening for split injections without the inertia and bouncing associated with mechanical systems. This substitution allows high-frequency operation and improved adaptability for split injection strategies.
Solution Approach 2:
The patent introduces dynamic magnetic field control to manage valve motion. By dynamically adjusting the magnetic field strength and timing, the system can rapidly transition between open and closed states, enabling quick reopening for split injections. This dynamic control overcomes the limitations of static mechanical systems and allows flexible high-frequency operation.
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 solution reduces fuel leakage, improves fuel metering accuracy, decreases particulate emissions, and enhances injector response times and split injection performance by minimizing bouncing and wear on components.
Implementation Method 1
since at least one of the valve mechanism and the valve mechanism seat is permanently magnetized, a magnetic force may attract the valve mechanism to the valve mechanism seat which may reduce bouncing when the valve mechanism engages with the valve seat
Implementation Method 2
a polarity of the injector driver may be reversed to oppose the valve mechanism to seat attraction, thereby reducing the speed of the valve mechanism near closing and creating a soft landing effect
Data Source
AI summary
Systems and methods for a permanently magnetized valve mechanism and/or valve mechanism seat for a fuel injector are disclosed. In one example approach, a fuel injector comprises a valve mechanism and a valve mechanism seat, wherein at least one of the valve mechanism and the valve mechanism seat is permanently magnetized; an injector driver circuit for actuating the valve mechanism; and a spring biasing the valve mechanism in a closed position against the valve mechanism seat. For example, a first amount of current may be supplied in a first direction to the injector driver to lift a permanently magnetized injector valve mechanism from the injector valve mechanism seat, and a second amount of current may be supplied in a second direction to the injector driver to close the permanently magnetized injector valve mechanism onto the injector valve mechanism seat.