Adjustable Fuel Injector Nozzle Axial Positioning
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Solution Overview
Problem
Current fuel injection systems for internal combustion engines are not optimally positioned for varying engine operation points, leading to inefficiencies and increased particle emissions, as the injector position is fixed and does not adapt to different engine speeds and loads.
Innovation Solution
A fuel injection system with a positioning system that adjusts the axial position of the injector nozzle using a tensioner device and an adjusting device, allowing for precise control of the injector nozzle's position within a predetermined range, ensuring optimal positioning for all engine operating states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed injector position is used, then the device complexity is reduced, but the adaptability to different engine operation points deteriorates
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed injector position into a dynamically adjustable one. The positioning system includes a tensioner device and an adjusting device that can vary the axial position of the injector nozzle along the injection direction. This allows the injector to adapt to different engine operation points (high power/high speed vs. low-end speed/low load) by changing its position, thereby resolving the contradiction between device simplicity and operational adaptability.
2Manufacturing precision
If a fixed injector position is used, then the manufacturing precision requirements are simplified, but the engine efficiency deteriorates
Solution Approach 1:
The patent resolves this contradiction by making the injector position dynamic rather than fixed. The positioning system enables the injector nozzle to be positioned at different axial locations optimized for specific engine operating conditions. This dynamic adjustment capability allows the engine to achieve high efficiency across various operation points without requiring extremely precise fixed positioning for every scenario, thus balancing manufacturing precision requirements with overall engine efficiency.
Solution Approach 2:
The patent applies parameter changes by varying the axial position of the injector nozzle as a controllable parameter. The adjusting device can modify the injector position based on engine operating conditions (speed and load), optimizing fuel injection characteristics for each regime. This parameter variation enables the system to maintain high engine efficiency across different operating points without demanding extreme manufacturing precision for a single fixed position.
3Device complexity
If a fixed injector position is used, then the device complexity is reduced, but the particle emissions increase
Solution Approach 1:
The patent addresses this contradiction by implementing a dynamic positioning system that adjusts the injector nozzle position based on engine operating conditions. By optimizing the injector position for different speed and load conditions, the system improves combustion efficiency and reduces particle emissions. The tensioner device and adjusting device work together to enable this dynamic optimization without excessively increasing device complexity.
Data Source
AI summary
A fuel injection system for an engine of a vehicle may include an injector nozzle mounted in an injector bore formed in a cylinder head of the engine, wherein a tip portion of the injector nozzle is protrudingly formed into a combustion chamber, and having a positioning system configured to adjust an axial position of the injector nozzle in the injector bore. The invention further provides a method of operating the fuel injection system.