Variable Fuel Injection for Uniform Gas Engine Mixture
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Solution Overview
Problem
In gas engines, insufficient mixing of fuel and air due to short distances and varying gas flow speeds in air channels can lead to incomplete combustion, resulting in NOx generation, knocking, and increased non-combusted fuel, especially when using a double pipe system for safety, which increases apparatus size and cost.
Innovation Solution
A gas engine design with a fuel jetting system that injects fuel into the intake air channel upstream of the branching point, allowing for longer mixing distances and adjustable fuel amounts to each intake pipe based on flow speed, ensuring uniform fuel concentration across all intake pipes, even with varying flow speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fuel is jetted into the intake air channel upstream of the branching portion, then the mixing distance between fuel and air is lengthened and mixing is improved, but the device complexity increases due to the need for precise fuel distribution control to multiple intake pipes
Solution Approach 1:
The patent applies local quality by making the fuel jetting amount variable for each intake pipe based on its specific flow characteristics. The fuel jetting means adjusts the fuel injection amount individually for each intake pipe according to the gas flow speed in that specific pipe, ensuring optimal fuel-air mixture ratio for each branch while maintaining overall system simplicity.
2Stability of the object's composition
If the fuel jetting means jets different amounts of fuel to each intake pipe, then uniform fuel concentration is achieved across all intake pipes, but the manufacturing precision requirements increase
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting the fuel jetting amount as a variable parameter based on the gas flow speed in each intake pipe. The fuel jetting means changes the fuel injection quantity according to the specific flow conditions of each pipe, allowing adaptive compensation for flow variations without requiring extremely precise manufacturing tolerances.
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 design ensures uniform combustion of fuel and air within the cylinder, reducing NOx generation, knocking, and non-combusted fuel, while maintaining a compact and cost-effective apparatus by optimizing fuel distribution according to gas flow speeds.
Implementation Method 1
a distance in which the fuel (for example, fuel gas) and the oxygen containing gas (for example, air) can be mixed with each other is lengthened
Implementation Method 2
in a case where a flow speed of the gas flowing in each air channel varies in each air channel
Data Source
AI summary
The purpose of the present invention is to provide a gas engine and a ship provided with the same, the gas engine making it is possible to ensure a distance that enables fuel and an oxidizing agent to mix, and to evenly mix the oxidizing agent and the fuel even if the flow rate of gas traveling towards intake pipes varies. A gas engine (1) comprises: an intake passage (10) through which a gas flows; a plurality of intake pipes (12A, 12B) where the intake passage (10) branches apart at a branching section (14) that is downstream in the gas flow direction, the intake pipes opening to a cylinder (16) at the downstream end; and a fuel injection means (31) that injects fuel into the intake passage (10). The fuel injection means (31) is provided upstream of the branching section (14) in the gas flow direction, and injects varying quantities of fuel into the plurality of intake pipes (12A, 12B).