Dual-Fuel Engine Ignition Fluid Injection Timing
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Solution Overview
Problem
Dual-fuel engines face inefficiencies in combustion and operating efficiency due to single injection of ignition fluid per power stroke in gaseous fuel mode, limiting optimal air/gas mixture burning.
Innovation Solution
Implementing at least two consecutive injections of ignition fluid during the power stroke, with the first injection occurring between 90° BTDC and 30° BTDC and the second between 40° BTDC and 20° BTDC, distributing 60-80% of the total injection amount in the first injection and 20-40% in the second, to enhance combustion and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single injection of ignition fluid is used per power stroke, then device complexity is reduced, but combustion efficiency deteriorates
Solution Approach 1:
The single injection event is segmented into multiple consecutive injections (first injection and second injection) during the power stroke. The first injection occurs in a crank angle range between about 90° BTDC and 30° BTDC, and the second injection occurs in a crank angle range between about 40° BTDC and 20° BTDC. This segmentation allows better distribution of ignition fluid throughout the combustion chamber, improving combustion efficiency without requiring fundamental changes to the injection system architecture.
2Productivity
If multiple consecutive injections of ignition fluid are implemented, then combustion efficiency is improved, but device complexity increases
Solution Approach 1:
The injection system performs periodic consecutive injections during the power stroke, with the first injection occurring in a crank angle range between about 90° BTDC and 30° BTDC and the second injection occurring in a crank angle range between about 40° BTDC and 20° BTDC. This periodic injection pattern is controlled through programmed injection timing and duration, allowing the system to achieve improved combustion efficiency through controlled periodic action rather than complex continuous control.
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 method improves combustion stability and efficiency by achieving faster and more complete burning of the air/gas mixture, as depicted in combustion curves, thereby increasing engine performance without requiring significant engine modifications.
Implementation Method 1
a gaseous fuel such as natural gas can be burned in a gaseous fuel operating mode of the engine... the ignition fluid is injected into each respective cylinder shortly before top dead center of the cylinder piston in the combustion chamber of the cylinder
Data Source
AI summary
A method for operating an engine, such as a dual-fuel engine, that includes a plurality of cylinders in which an air/gas mixture of air and gaseous fuel is ignited during a power stroke using an ignition fluid that is injected into each cylinder during a power stroke of the cylinder. The air/gas mixture is injected into each cylinder, and the injection fluid is injected into the each cylinder into which the air/gas mixture has been injected. The ignition fluid is injected into the each cylinder in at least two consecutive injections during the power stroke of the each cylinder.