Fuel Injection Valve Variable Stroke Control
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Solution Overview
Problem
Existing fuel injection valves, such as those described in PTL1, do not allow for variable stroke amounts of the valve body, limiting the control range of fuel injection and failing to achieve a balance between low fuel consumption and high engine output.
Innovation Solution
A fuel injection valve configuration with multiple movable elements, a valve body, a fixed iron core, and a coil, where the movable elements are engaged with the valve body, allowing for two distinct stroke amounts by adjusting magnetic attractive forces generated by the coil, enabling expanded control of fuel injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single movable element configuration is used, then the device structure is simple, but the control range of fuel injection amount is limited
Solution Approach 1:
The movable element is divided into multiple segments (first movable element and second movable element) that can move independently. Each segment can be actuated separately by the coil to produce different stroke amounts, thereby expanding the control range of fuel injection amount without requiring multiple complete valve assemblies
Solution Approach 2:
The system transitions from a fixed single-stroke configuration to a dynamic multi-stroke configuration. The movable elements can switch between different positions (first position and second position) to provide variable stroke amounts, enabling the fuel injection valve to adapt to different operating conditions
2Adaptability or versatility
If the valve body stroke is fixed, then the manufacturing is simple, but the fuel injection control is limited to narrow operation region
Solution Approach 1:
The valve body stroke is segmented into multiple discrete positions through the use of first and second movable elements. Each element can be positioned at different locations, creating distinct stroke amounts (first stroke amount and second stroke amount) that correspond to different operating regions of the engine
Solution Approach 2:
The system changes the stroke parameter dynamically by moving the movable elements between different positions. The coil controls the position of each movable element, thereby changing the effective stroke length to match different engine operating conditions, achieving both simplicity and precision
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 configuration expands the control range of fuel injection, allowing for optimal fuel injection across a wide engine operation region, achieving both low fuel consumption and high output.
Implementation Method 1
a coil for displacing the movable element and causing the valve body to be seated on or unseated from the valve seat
Data Source
AI summary
A fuel injection valve includes a valve body, a coil, an inner fixed iron core that is arranged on an inner peripheral side of the coil, and an outer fixed iron core that is arranged on an outer peripheral side of the coil. The fuel injection valve also includes a movable element that is configured to be attracted to the inner fixed iron core and the outer fixed iron core, wherein the movable element is configured to be separable from the valve body and is configured to move the valve body.