Dual Fuel Injector Control Chambers for Leakage Prevention
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Solution Overview
Problem
Compression ignition dual fuel engines face challenges in controlling gaseous fuel injection due to pressure fluctuations in the liquid fuel system, leading to potential leakage and inefficiencies in fuel delivery.
Innovation Solution
The design incorporates separate control chambers and check valves for liquid and gaseous fuels, with a pressure damping chamber to absorb pressure waves and prevent leakage, allowing for independent control of fuel injection events using electronic actuators and a dual fuel common rail system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If liquid fuel is used to control both gaseous and liquid injection events, then the fuel system can be simplified, but pressure fluctuations in the liquid fuel system undermine effective control of gaseous fuel injection events
Solution Approach 1:
The fuel system is divided into separate liquid fuel control and gaseous fuel control pathways. The liquid fuel control chamber and gaseous fuel control chamber are independently controlled by separate actuators, allowing precise control of each fuel type without interference from pressure fluctuations in the other system.
Solution Approach 2:
A separate gaseous fuel control chamber acts as an intermediary between the gaseous fuel supply and the injection event. This control chamber is filled with gaseous fuel and controlled by a dedicated actuator, isolating the gaseous fuel injection control from liquid fuel pressure variations.
2Device complexity
If liquid fuel is used to control gaseous fuel injection, then the control system can be simplified, but leakage of liquid fuel into the gaseous side of the dual fuel system presents problems
Solution Approach 1:
The control system is segmented into separate liquid and gaseous fuel control chambers with independent actuators. This segmentation prevents liquid fuel from entering the gaseous fuel system while maintaining simplified control architecture for each fuel type.
Solution Approach 2:
The liquid fuel control function is extracted from the gaseous fuel control system. The liquid fuel control chamber and actuator are separate components that do not interfere with the gaseous fuel system, eliminating the problem of liquid fuel leakage into the gaseous side.
3Reliability
If separate control chambers are used for liquid and gaseous fuels, then control precision is improved, but the device complexity increases
Solution Approach 1:
The liquid fuel control chamber and gaseous fuel control chamber are merged into a single integrated control system within the fuel injector. Both chambers share common structural elements and control mechanisms, achieving precise separate control while minimizing overall complexity.
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 enhances the precision and reliability of fuel injection, reducing sensitivity to pressure differences and minimizing leakage between fuel types, thereby improving engine efficiency and stability.
Implementation Method 1
a pressure damping chamber to absorb pressure waves and prevent leakage
Implementation Method 2
fluid pressure in control chambers that allow for the direct control of the opening and closing of separate check valves
Data Source
AI summary
A compression ignition dual fuel engine utilizes individual fuel injectors to inject both gaseous and liquid fuels into each engine cylinder. Each of the fuel injectors includes two electrical actuators that control pressure in a respective liquid control chamber and gaseous control chamber to control the opening movement of check valves to facilitate liquid and gaseous fuel injection events, respectfully. The control fluid for liquid injection events is liquid, whereas the control fluid for the gaseous injection event is gaseous. The used liquid fuel drained from each fuel injector is returned for recirculation and subsequent injection, whereas the used gaseous fuel that drains from the fuel injector is supplied to the intake manifold for burning as circumstances permit.