Cylinder Direct Injection Engine Dual Fuel Combustion Control
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Solution Overview
Problem
Internal combustion engines using two fuels with different ignitability struggle to reduce NOx emissions and prevent fuel mixing, leading to increased combustion temperature and smoke formation.
Innovation Solution
Injecting low-octane fuel earlier to form an ignition flame, followed by injecting high-octane fuel towards the flame, ensuring continuous combustion and reducing the formation of rich regions, thereby minimizing NOx emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-octane fuel and high-octane fuel are separately injected toward the center and periphery of the combustion chamber to prevent mixing, then stable combustion is achieved, but a rich region is inevitably formed increasing NOx emission
Solution Approach 1:
The low-octane fuel is injected first to create an ignition flame before the high-octane fuel is injected. This preliminary action of forming an ignition source ensures that when the high-octane fuel is subsequently injected, it can be immediately combusted without forming a rich region, thereby reducing NOx emissions while maintaining stable combustion
Solution Approach 2:
The fuel injection process is segmented into two distinct phases: first injecting low-octane fuel to form an ignition flame, then injecting high-octane fuel toward the flame. This temporal segmentation allows each fuel type to serve its specific function without mixing, preventing rich region formation while ensuring continuous combustion
2Power
If two kinds of fuels are injected simultaneously, then a rich region is formed increasing combustion temperature, but the amount of smoke emission is increased due to shortage of air
Solution Approach 1:
The low-octane fuel is injected in advance to establish an ignition flame that provides immediate combustion capability. When the high-octane fuel is subsequently injected, it is immediately combusted in the presence of sufficient oxygen, preventing the formation of rich regions and reducing smoke emissions while maintaining adequate combustion temperature
Solution Approach 2:
The sequential injection method ensures continuous combustion action by first establishing an ignition flame and then immediately introducing the high-octane fuel for combustion. This continuous process prevents air shortage and rich region formation, reducing smoke emissions while maintaining power output
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 hydrocarbon emissions and prevents the formation of rich regions, resulting in lower NOx emissions and improved combustion efficiency.
Implementation Method 1
forming an ignition flame by self-ignition combustion of the first octane-value fuel
Implementation Method 2
causing flame propagation and combustion of the second octane-value fuel
Data Source
AI summary
A cylinder direct injection type internal combustion engine, including a fuel injection device configured to directly inject a first octane-value fuel and a second octane-value fuel into a combustion chamber. The second octane-value fuel has an octane value larger than an octane value of the first octane-value fuel. A controller is programmed to perform a first operation mode. In the first operation mode, the first octane-value fuel is injected from the fuel injection device, and the second octane-value fuel is injected from the fuel injection device toward an ignition flame formed by self-ignition combustion of the first octane-value fuel, so as to cause flame propagation and combustion of the second octane-value fuel.