Swirl Control Valve Fuel Injection for Homogeneous Mixture
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Solution Overview
Problem
Existing fuel injection systems fail to achieve a suitable mixture gas distribution within the combustion chamber, leading to unstable combustion, increased combustion noise, excessive NOx production, and reduced ignition stability due to uneven fuel distribution.
Innovation Solution
A fuel injection device that utilizes a swirl flow generated by a swirl control valve to inject multiple fuel portions at specific angles and pressures, ensuring even distribution and merging of fuel sprays within the combustion chamber, thereby forming a homogeneous mixture gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fuel is injected into the combustion chamber without utilizing swirl flow, then the injection process is simple, but the mixture gas distribution becomes uneven leading to unstable combustion and increased NOx emissions
Solution Approach 1:
The swirl control valve generates a swirl flow in advance before fuel injection occurs. This preliminary action of creating the swirling gas flow ensures that when fuel is injected, it is immediately carried and distributed uniformly throughout the combustion chamber, achieving homogeneous mixture gas distribution without requiring complex multi-point injection systems
Solution Approach 2:
The swirl flow acts as an intermediary medium between the injected fuel and the combustion chamber environment. The swirl control valve creates this intermediate swirling flow field that actively transports and distributes the fuel, mediating the mixing process and achieving uniform mixture gas distribution without direct complex injection hardware throughout the chamber
2Manufacturing precision
If multiple fuel portions are injected at different positions to improve mixture distribution, then the mixture gas distribution improves, but the control system becomes more complex
Solution Approach 1:
The fuel injection is divided into multiple portions injected at different positions and timings. The fuel injection device injects fuel at multiple locations including near the intake valve and in the combustion chamber, with each portion being carried by the swirl flow to different regions, achieving comprehensive and uniform mixture gas distribution through segmented injection strategy
Solution Approach 2:
The fuel injection is performed in periodic stages: first during the intake stroke when the intake valve is open, and then during the compression stroke. This periodic injection approach ensures that fuel is distributed uniformly throughout the combustion chamber cycle, achieving homogeneous mixture gas distribution through time-based segmentation of the injection process
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 solution achieves stable and efficient combustion with reduced NOx emissions and improved ignition stability by ensuring a homogeneous mixture gas distribution, enhancing both Spark Ignition (SI) and Compression Ignition (CI) combustion processes.
Implementation Method 1
a swirl control valve configured to generate an inclined swirl flow inside the combustion chamber flowing obliquely with respect to the center axis
Implementation Method 2
the spray of the first fuel portion reaches the first position and then moves away from the first position by the swirl flow before the spray of the second fuel portion reaches the second position
Implementation Method 3
causing the fuel to whirl and diffuse in the swirl flow to form a stratified mixture gas
Data Source
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AI summary
A control device of an engine including a cylinder, a piston, a cylinder head, and a combustion chamber, is provided. The device includes intake and exhaust ports, a swirl control valve, a fuel injection valve attached to the cylinder head to be oriented into the combustion chamber and having first and second nozzle ports, and a control unit. The control unit includes a processor configured to execute a swirl opening controlling module to control the swirl control valve to have a given opening at which a swirl ratio inside the combustion chamber becomes 2 or above, and a fuel injection timing controlling module to control the fuel injection valve to inject fuel at a given timing at which the swirl ratio becomes 2 or above and a swirl flow from a lower portion to a higher portion of the combustion chamber in a side view occurs.