Fuel Injector Spool Valve for Air-Fuel Mixing
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Solution Overview
Problem
Existing fuel injectors fail to ensure adequate air/fuel mixing in combustion chambers, leading to soot production and decreased fuel economy, especially under stringent emissions standards, and do not effectively extend the fuel injection duration to improve mixing in both diesel and spark-ignited engines.
Innovation Solution
A fuel injector with an injector spool valve that rotates within the injector body, featuring a curved rectangular fuel outlet to adjust fuel flow to different portions of the nozzle inlet, allowing for expanded fuel injection windows that overlap intake and compression strokes, thereby enhancing air/fuel mixing and reducing piston wetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fuel is injected directly into the combustion chamber without sufficient mixing time, then injection duration is shortened and engine power is maintained, but air/fuel mixing is insufficient leading to soot production and poor fuel economy
Solution Approach 1:
The system performs preliminary air/fuel mixing during the intake stroke before combustion occurs. The fuel injector delivers fuel during the intake stroke when air is already present in the combustion chamber, allowing mixing to occur during the intake and early compression phases before combustion begins. This preliminary mixing action ensures adequate homogenization without requiring extended injection duration into the combustion phase.
2Object-generated harmful factors
If fuel injection duration is extended to improve air/fuel mixing, then soot production decreases, but injection timing becomes restricted and fuel economy is reduced
Solution Approach 1:
The system dynamically adjusts injection timing and duration based on engine operating conditions. The controller can initiate fuel injection during the intake stroke and extend it through the compression stroke, adapting the injection window to the specific engine cycle phase. This dynamic timing adjustment allows optimal mixing duration without restricting the overall injection capability of the system.
3Device complexity
If conventional fuel injectors are used with fixed injection timing, then device complexity is minimized, but air/fuel mixing is insufficient under varying engine operating conditions
Solution Approach 1:
The fuel injector system is designed to perform multiple injection functions within a single injector unit. It can deliver fuel during both the intake stroke and compression stroke, and can adjust injection duration and timing based on engine operating conditions. This multi-functionality allows a single injector design to adapt to varying engine loads, speeds, and combustion modes without requiring multiple specialized injectors.
4Object-generated harmful factors
If particulate filters are added to reduce soot emissions, then harmful emissions are decreased, but manufacturing costs and fuel consumption increase
Solution Approach 1:
The system performs preliminary air/fuel mixing during the intake stroke before combustion occurs. The fuel injector delivers fuel during the intake stroke when air is already present in the combustion chamber, allowing mixing to occur during the intake and early compression phases before combustion begins. This preliminary mixing action ensures adequate homogenization without requiring extended injection duration into the combustion phase.
Data Source
AI summary
Methods and systems are provided for a fuel injector. In one example, a system comprises an injector spool valve having a fuel outlet shaped to flow fuel to different portions of a nozzle inlet based on an actuation of the injector spool valve, thereby adjusting a fuel injection angle of a fuel injection.