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Nam, Choonggeun
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A Study of the Half Order Modulation Control for Diesel Combustion Noise by Using Model Based Controller Design

Hyundai Motor Company-Ki Hwa Lee, Choonggeun Nam, O Jun Kwon, Jung-Hwan Moon
Siemens Industry Software SAS-Pascal Giansetti
Published 2019-03-25 by SAE International in United States
This model based investigation is carried out in order to control the half order modulation for diesel engines using by virtual calibration approach and proposes a feedback control strategy to mitigate cylinder to cylinder imbalance from asymmetric cylinders torque production. Combustion heat release analysis is performed on test data to understand the root cause of observed cylinder to cylinder pressure variations. The injected fuel variations are shown to cause the observed pressure variations between cylinders. A feedback control strategy based on measured crank shaft position is devised to control the half order modulation to balance the combustion pressure profile between cylinders. This control strategy is implemented in Simulink and is tested in closed-loop with the diesel engine model in AMESim. The closed-loop performance indicates that the half order modulation is considerably improved while having minimal impact on the fuel consumption.
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Vibration and Noise Reduction Technology Development by Diesel Engine Fuel System Modeling

Hyundai Motor Company-Seongyoon Bae, Kwangmin Won, Choonggeun Nam
Sogang University-Koo-Tae Kang
Published 2013-10-14 by SAE International in United States
In this paper, the vibration and noise reduction technology for diesel common rail injection system is studied. The NV problems of the injection system come typically from mechanical contacts (injector needle, pump) or fluid pulsations. They are exciting the injection system, which translates the excitations to the engine through the connection points. But it's not easy to identify the characteristic of internal excitation force exactly, so the simulation model based measurement test is considered at here.In order to predict the vibrations due to excitation related with the injection system of the diesel engine, the 1D/3D simulation models are used and the necessary dynamic tests, which are needed to create and validate the models, are done in the test bench. With the full system model validated by the operational test data of an engine, the TPA(Transfer Path Analysis) for the radiated noise is done and the main frequencies in the injection system are analyzed in the vibration and noise point of view.The obtained results allow getting an understanding in the mechanisms causing the NVH issues for…
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An Advanced Method for Developing Combustion Noise through the Analysis of Diesel Combustion

SAE International Journal of Engines

Hyundai Motor Co. & KIA Motors Corp.-Insoo Jung, Jaemin Jin, Hyunkee So, Choonggeun Nam, Kwangmin Won
  • Journal Article
  • 2013-01-1901
Published 2013-05-13 by SAE International in United States
The source of the combustion noise of diesel engines was investigated in this paper. In the development of exhaust emission and combustion noise, we must optimize the injection parameters at the cell where engine noise can not be measured. To solve this problem, it is necessary to identify a method for developing combustion noise through in-cylinder pressure measurements. It is known that the combustion noise of a diesel engine is generated mainly in the phase of premixed combustion and depends on the rate at which the pressure increases. The combustion noise was analyzed by measuring the in-cylinder pressure and engine noise. Our results show that the combustion noise has a low correlation with the maximum rate of pressure increase. For this reason, a new index called the combustion noise index was developed based on the cylinder pressure level. This paper describes an advanced method for developing combustion noise and illustrates some examples of the results obtained.
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