Dual Fuel Path Gas Engine Operation for Power-Emission Tradeoffs
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Solution Overview
Problem
Existing gas engines lack the ability to dynamically adjust fuel supply paths to optimize performance for either reduced exhaust emissions or increased dynamic capability based on operating conditions.
Innovation Solution
A gas engine with at least two separate fuel supply paths allows selective operation in modes with direct injection or fuel-air mixture injection, enabling adaptation to different performance requirements by switching between these modes based on the engine's operating point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If direct injection is used to supply fuel to the combustion chamber, then dynamic capability and mechanical efficiency are improved, but exhaust emissions (particularly NOx) increase
Solution Approach 1:
The system dynamically switches between two fuel supply paths (direct injection and air path injection) based on operating conditions. The control unit selects the appropriate path to optimize the balance between power output and emissions reduction, making the system adaptable rather than fixed in its fuel delivery method
Solution Approach 2:
The invention changes the fuel delivery parameter by switching between two distinct supply paths. In the first operating mode, fuel is delivered directly to the combustion chamber for high power output. In the second operating mode, fuel is delivered through the air intake tract to form a fuel-air mixture, changing the combustion parameters to reduce emissions
2Object-generated harmful factors
If fuel is supplied through the air intake tract to form a fuel-air mixture, then exhaust emissions are reduced, but dynamic capability and mechanical efficiency decrease
Solution Approach 1:
The system dynamically switches between two fuel supply paths (direct injection and air path injection) based on operating conditions. The control unit selects the appropriate path to optimize the balance between power output and emissions reduction, making the system adaptable rather than fixed in its fuel delivery method
Solution Approach 2:
The invention changes the fuel delivery parameter by switching between two distinct supply paths. In the first operating mode, fuel is delivered directly to the combustion chamber for high power output. In the second operating mode, fuel is delivered through the air intake tract to form a fuel-air mixture, changing the combustion parameters to reduce emissions
3Device complexity
If a fixed fuel injection method is used, then the system structure is simple, but the ability to optimize performance and emissions under different operating conditions is limited
Solution Approach 1:
The fuel supply system is segmented into two distinct paths: a first fuel path for direct injection and a second fuel path for air path injection. This segmentation allows the system to choose the appropriate path for different operating conditions, providing flexibility while maintaining relatively simple individual path designs
Solution Approach 2:
The fuel supply system is designed with multi-functionality, where the same system can operate in two different modes depending on the control unit's selection. The combustion chamber and fuel injection components serve multiple functions by supporting both direct injection and air path injection operations
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
The engine achieves increased dynamic capability at lower to mid-range speeds with direct injection and reduced exhaust emissions at other speeds by strategically utilizing the fuel supply paths, enhancing efficiency and adaptability.
Implementation Method 1
direct injection takes place via the first fuel path... the fuel exiting the injector is directly in the main combustion chamber
Implementation Method 2
the mixture formation between the fuel gas and the air begins before the gas enters the combustion chamber... fuel is supplied to the air intake of at least one combustion chamber and, consequently, is already fed to the combustion chamber in the form of a fuel-air mixture
Implementation Method 3
combustion chamber... fuel gas... fuel supply... combustion process
Data Source
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AI summary
The invention relates to a method for operating a gas engine comprising at least one combustion chamber and at least two fuel supply paths for supplying fuel to the at least one combustion chamber, wherein direct injection or injection into the intake tract for the at least one combustion chamber can be selectively carried out via the at least two different fuel supply paths, characterized in that, with reference to the main injection, in a first operating mode the fuel portion required for loading the at least one combustion chamber is supplied to the combustion chamber exclusively by direct injection, and in a second operating mode the fuel portion required for loading the at least one combustion chamber is supplied exclusively in the form of a fuel-air mixture via the air intake of the combustion chamber, which is formed due to the supply of fuel into the intake tract of the combustion chamber or of several combustion chambers.