Engine Combustion Noise Index Control via Injection Timing
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Solution Overview
Problem
Existing engine control methods fail to consistently reduce vibration and noise in combustion chambers due to variations in main and pilot injection amounts, leading to unstable combustion and increased vibration and noise.
Innovation Solution
An engine control apparatus and method that utilizes a combustion pressure sensor to measure internal combustion pressure, convert it into a combustion noise index through FFT, and adjust main injection timing, injection pressure, and pilot fuel amount based on the calculated index, determining abnormal combustion and potential injector or fuel issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If pilot injection is performed to reduce combustion pressure rate of rise, then combustion noise is reduced, but injection amount control becomes unstable leading to increased vibration and noise
Solution Approach 1:
The system uses combustion pressure sensors to continuously monitor combustion pressure and calculates combustion noise index in real-time. This feedback is used to adjust pilot injection amount and main injection timing dynamically, ensuring stable control despite variations in injection operations. The feedback mechanism compensates for control instability by detecting actual combustion noise levels and adjusting injection parameters accordingly.
Solution Approach 2:
The system changes injection parameters (pilot injection amount, main injection timing, injection pressure) based on calculated combustion noise index. By dynamically adjusting these parameters rather than using fixed values, the system maintains optimal combustion noise reduction while compensating for injection amount variations caused by extended injector operation periods.
2Stability of the object's composition
If main injection timing is controlled using combustion pressure sensor, then combustion stability is improved, but vibration and noise cannot be consistently reduced due to injection amount variations
Solution Approach 1:
The system calculates combustion noise index from combustion pressure data and uses this feedback to adjust not only main injection timing but also pilot injection amount and injection pressure. This multi-parameter feedback control ensures that both combustion stability and vibration/noise reduction are achieved simultaneously, overcoming the limitation of using combustion pressure sensor alone for timing control.
Solution Approach 2:
The system performs pilot injection before main injection to pre-heat the combustion chamber and improve fuel-air mixture. By controlling pilot injection amount based on combustion noise index, the system prepares optimal combustion conditions in advance, ensuring that subsequent main injection produces stable combustion with reduced vibration and noise despite injection amount variations.
3Productivity
If injector operation period is extended to improve fuel delivery, then fuel injection capability is enhanced, but injection amount accuracy deteriorates leading to combustion variations
Solution Approach 1:
The combustion noise index calculation provides continuous feedback on actual combustion quality. When injection amount accuracy deteriorates due to extended injector operation, the feedback mechanism detects combustion variations and adjusts pilot injection amount and main injection timing to compensate, maintaining accurate effective injection amounts despite the injector's extended operation period.
Solution Approach 2:
The system changes injection parameters (injection pressure, pilot fuel amount, main injection timing) based on combustion noise index to compensate for accuracy deterioration. By dynamically adjusting these parameters, the system maintains precise effective injection control even when the injector operates for extended periods, preserving both productivity and precision.
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
Achieves combustion stability by controlling injection parameters and identifies operational issues such as faulty fuel or inoperable injectors, thereby reducing engine vibration and noise.
Implementation Method 1
a combustion pressure sensor that measures internal combustion pressure of a combustion chamber of an engine
Implementation Method 2
the controller calculates the CNI by converting the combustion pressure sensor through FFT (Fast Fourier Transformation)
Implementation Method 3
an injector that injects fuel into the combustion chamber
Implementation Method 4
combustion generated at a combustion chamber of an engine
Data Source
AI summary
A method of calculating a nitrogen oxide (NOx) mass reduced from a lean NOx trap (LNT) during regeneration includes calculating a C3H6 mass flow used to reduce the NOx among a C3H6 mass flow flowing into the LNT of an exhaust purification device, calculating a NH3 mass flow used to reduce the NOx among a NH3 mass flow flowing into the LNT, calculating a reduced NOx mass flow based on the C3H6 mass flow used to reduce the NOx and the NH3 mass flow used to reduce the NOx, and calculating the reduced NOx mass by integrating the reduced NOx mass flow over a regeneration period.