Dual Fuel Injector System for Engine Startup and Emission Control
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Solution Overview
Problem
Existing injection devices for internal combustion engines face limitations in flow rate range, leading to inefficient fuel injection and increased exhaust emissions when switching between gasoline and natural gas fuels, particularly during startup and warm-up phases.
Innovation Solution
The use of two separate injection systems with distinct fuel injectors for natural gas and gasoline, allowing for optimized flow rates and reduced spray density, which enhances fuel burn-through and minimizes exhaust emissions by tailoring fuel injection to specific engine loads and phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fuel injector is used for both natural gas and gasoline, then the device complexity is reduced, but the flow rate range is insufficient to meet the high demands of natural gas injection
Solution Approach 1:
The fuel injection system is segmented into separate injectors for different fuels. The patent employs a first fuel injector dedicated to natural gas and a second fuel injector dedicated to gasoline, allowing each injector to be optimized for its specific fuel type's flow rate requirements without compromise
2Productivity
If gasoline is injected during startup and warm-up phase, then the burn-through is more rapid and stable, but the exhaust emissions increase due to incomplete combustion
Solution Approach 1:
The fuel injection system dynamically switches between different fuel types based on operating conditions. During startup and warm-up phases, the system uses gasoline injection for rapid burn-through, while during normal operation it switches to natural gas injection to minimize emissions, optimizing performance for each operational state
3Object-generated harmful factors
If natural gas is used for startup, then the exhaust emissions are reduced, but the burn-through is less efficient and requires higher fuel quantities
Solution Approach 1:
The system changes the fuel type parameter based on operating conditions. For startup and warm-up operations, gasoline is used as the fuel parameter to achieve efficient burn-through. For normal operation, the fuel parameter is switched to natural gas to reduce emissions, with the control system adjusting fuel injection parameters accordingly
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 approach reduces exhaust emissions, increases engine output, and allows for more efficient fuel combustion, resulting in lower emissions and improved engine performance by ensuring precise fuel injection and reduced raw exhaust gases, especially during startup and warm-up phases.
Implementation Method 1
the characteristic droplet size, especially the Sauter diameter, of the atomized fuel is reduced in advantageous manner
Implementation Method 2
the burn-through of the fuel mixture in the combustion chamber
Data Source
AI summary
An injection device for an internal combustion engine having a first injection system for injecting fuel having a first fuel composition, and a second injection system for the injection of fuel having a second fuel composition that has a lower ethanol component than the first fuel composition, the first injection system having at least one first fuel injector for injecting fuel having the first fuel composition both in the direction of a first intake orifice of a combustion chamber of the internal combustion engine, and in the direction of a second intake orifice of the combustion chamber, in which the second injection system has a second fuel injector for injecting fuel having the second fuel composition essentially only in the direction of the first intake orifice, and a separate third fuel injector for injecting fuel having the second fuel composition essentially only in the direction of the second intake orifice.