Multihole Injector Offset Design for Fuel Spray Positioning
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Solution Overview
Problem
Multi hole injection type fuel injection valves for internal combustion engines face issues with fuel spray distribution and uniformity due to positional drift of injected fuel, affecting engine and exhaust performance when injection holes are inclined.
Innovation Solution
The fuel injection valve is designed with each injection hole having an inclined angle and a predetermined offset amount to correct the positional drift of the fuel spray, ensuring the center of gravity is oriented in the target direction, thereby optimizing fuel spray positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If injection holes are set with inclinations of 5°-50° with respect to the axis of the fuel injection valve, then fuel is injected in multiple directions from multi injection holes, but the injected fuel spray drifts with respect to the desired direction, affecting distribution and uniformity of the fuel spray in the cylinder
Solution Approach 1:
The patent applies preliminary anti-action by pre-calculating and applying an offset to the injection hole inclination angles to counteract the anticipated spray drift. The injection holes are intentionally angled differently from the desired spray direction so that the natural drift of the fuel spray compensates for the offset, causing the spray to reach the correct target position. This resolves the contradiction by maintaining multi-directional injection capability while achieving accurate spray positioning.
Solution Approach 2:
The patent changes the parameter of injection hole inclination angle by introducing an offset value that differs from the desired spray angle. Instead of setting injection holes at the target spray angle, the patent adjusts the hole angle parameter to account for predicted drift, thereby transforming the relationship between hole orientation and spray trajectory to achieve both multi-directional injection and accurate positioning.
2Adaptability or versatility
If respective orifices are set in an inclined manner with respect to a center line of the fuel injection valve, then fuel injection in multiple directions is achieved, but the center of gravity position of the injected fuel spray drifts from the target direction
Solution Approach 1:
The patent applies preliminary anti-action by pre-compensating for the spray center of gravity drift through offset adjustment. The injection hole angles are calculated in advance to counteract the expected drift, ensuring that the actual spray center of gravity reaches the desired target position despite the inclined orientation of the holes. This maintains multi-directional spray capability while achieving precise positioning.
Solution Approach 2:
The patent employs feedback by using measured or calculated spray drift characteristics to determine the appropriate offset values for injection hole angles. The drift behavior is analyzed and fed back into the design process to establish the correct hole orientations, creating a closed-loop approach that ensures accurate spray positioning while maintaining multi-directional injection.
Data Source
AI summary
Each of the injection holes has an inclined angle with respect to a center line of an injection valve main body as well as the inclined angle of each of the injection holes is provided with a predetermined offset amount with respect to a target inclination angle of a center of gravity position of each of the injected fuel sprays. The predetermined offset amount is set based on a correction amount for correcting positional drift with respect to the target direction of the center of gravity position of the fuel spray.