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International Journal of Automotive Technology

, Volume 20, Issue 1, pp 187–195 | Cite as

Analysis of Vibration on an Engine Block Caused by Combustion in a Diesel Engine

  • Yoonwoo Lee
  • Seunghyun Lee
  • Hoimyung Choi
  • Kyoungdoug MinEmail author
Article

Abstract

An accelerometer replaced an in-cylinder pressure sensor to detect the combustion status. The correlation between the vibration on an engine block caused by direct combustion as well as the combustion status was analyzed. The direct combustion vibration was determined. The direct combustion vibration on an engine block was blended with indirect combustion vibrations and other accessories. In addition, the combustion status was specified among several combustion status parameters, namely, RoHR, MPRR, and the peak pressure. There were two distinct vibrations in the motoring state. The frequency range of 2.5–8 kHz and 0–10°CA aTDC was assumed to be a crankshaft vibration. The other vibration, 1–3 kHz and 20–30°CA aTDC, was estimated as a slap motion of the piston. The combustion vibration frequency was 0.1–8 kHz after combustion. As an injector vibration (3–8 kHz) disrupted the search for combustion noise, a 0.1–2 kHz vibration range was appropriate for finding the correlation with the direct combustion state and the peak of the RoHR. As the peak of the RoHR was proportional to the combustion noise, the estimated peak of the RoHR can be used to control the diesel engine’s combustion noise. Estimation was possible in the transient and steady states.

Key words

Compressed ignition combustion control Combustion noise Combustion vibration Rate of heat release rate Max pressure rise rate 

Nomenclature

aTDC

after top dead center

CAD

crank angle degree

CWT

continuous wavelet transform

SOI

start of injection

EOI

end of injection

MFB

mass fraction burned

MIT

main injection timing

MPRR

max pressure rise rate

PRR

pressure rise rate

RoHR

rate of heat release

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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yoonwoo Lee
    • 1
  • Seunghyun Lee
    • 1
  • Hoimyung Choi
    • 2
  • Kyoungdoug Min
    • 1
    Email author
  1. 1.Department of Mechanical and Aerospace EngineeringSeoul National UniversitySeoulKorea
  2. 2.Department of Mechanical EngineeringGachon UniversityGyeonggiKorea

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