Swirl Port Combustion Control for Engine Efficiency
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Solution Overview
Problem
Internal combustion engines face inconsistencies in air/fuel mixture ignition, leading to variations in ignition delay, burn duration, and efficiency, due to high heat transfer rates and limited spark timing, which affect peak pressures and temperatures, and result in compromised torque and efficiency.
Innovation Solution
The implementation of a swirl port system that delivers fluid into the combustion volume at a predetermined angle, creating a swirling motion with a quantified swirl rate, which enhances burn characteristics, reduces heat transfer to cylinder walls, and allows for optimized combustion conditions by matching fuel injection timing with the swirl rate to achieve uniform fuel distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high swirl rate is used to improve combustion uniformity and reduce heat transfer losses, then combustion consistency improves, but the complexity of controlling spark timing and managing knock limitations increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the swirl rate (through different swirl port geometries and fluid delivery configurations) and spark timing parameters to achieve optimal combustion consistency. By changing the swirl number parameter and its relationship with spark advance, the system resolves the contradiction between improved combustion reliability and control complexity.
2Object-affected harmful factors
If spark timing is retarded to avoid knock in quickest burning cycles, then knock is prevented, but torque and efficiency are compromised on slower burning cycles
Solution Approach 1:
The patent changes the combustion characteristics parameter through controlled swirl rate adjustment, which modifies the burn duration and pressure rise rate. This allows the system to prevent knock while maintaining torque and efficiency by altering the fundamental combustion parameters rather than simply retarding spark timing.
Solution Approach 2:
The patent applies preliminary action by establishing a consistent swirl motion before ignition occurs. This pre-combustion preparation ensures uniform mixture preparation and predictable burn rates, allowing optimal spark timing to be set in advance without risking knock, thereby maintaining both power output and efficiency.
3Productivity
If high velocity gas motion is created in the cylinder to improve combustion, then burn rate increases, but heat transfer rate between gases and cylinder walls increases
Solution Approach 1:
The patent applies parameter changes by optimizing the swirl rate parameter to achieve an optimal balance between burn rate and heat transfer losses. By carefully controlling the swirl number and its relationship with combustion phasing, the system maintains high productivity while minimizing energy losses through controlled heat transfer parameters.
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 improves the uniformity of combustion initiation, burn duration, and ignition timing, enabling higher efficiency and power characteristics by controlling the angle of fluid entry and swirl rate, allowing for retarded ignition conditions at high compression ratios and advanced timing at part throttle.
Implementation Method 1
A swirl port delivers a fluid into a combustion volume within a cylinder of an internal combustion engine via a swirl port outlet such that the delivered fluid is directed around a periphery of the cylinder with a fluid velocity disposed at a predetermined angle away from tangential to a curve of the cylinder wall to generate a swirling motion in the combustion volume
Data Source
AI summary
An internal combustion engine can include a combustion volume within a cylinder of an internal combustion engine. The combustion volume can be defined at least by a cylinder wall and a first piston in the cylinder. A swirl port can deliver a fluid into the combustion volume via a swirl port outlet such that the delivered fluid is directed around a periphery of the cylinder with a fluid velocity disposed at a predetermined angle away from tangential to a curve of the cylinder wall to generate a swirling motion in the combustion volume.