Online Measuring Method for the Engines’ IVC Timing Based on the In-Cylinder Pressure Fluctuation

  • Fushui Liu
  • Zhongjie Shi
  • Yikai LiEmail author
  • Yang Hua
  • Yanlin Chen
  • Yongli Gao


The in-cylinder pressure fluctuations caused by intake valve closure (IVC) event were first investigated experimentally based on a single cylinder diesel engine with different cams. The experimental results show that the occurrence of the in-cylinder pressure fluctuation during the compression stroke has a close correlation with the IVC event. The start time of the pressure oscillation advances as the IVC timing advances. With a fixed IVC timing, higher engine speed results in a larger fluctuation amplitude and a longer fluctuation duration. To explain these phenomena, a numerical simulation model has been adopted. Results show that the IVC event causes pressure oscillations in both the cylinder and intake runner. At the same engine speed, the amplitude of the pressure oscillation decreases first and then increases as the IVC retards due to the change of gas flow direction. With the same intake temperature, the absolute time delay keeps constant at different engine speeds and IVC timings. The absolute time delay decreases as the intake temperature decreases. Based on the conclusions above, the potential methods to use the pressure oscillation are also discussed. An innovative engine valve timing detection method on the basis of in-cylinder pressure oscillation is presented.

Key words

Internal combustion engines Online measuring Valve events timing Pressure fluctuation CFD analysis 



three dimentional


speed of sound, m/s


crank angle degree


controlled auto-ignition


computational fluid dynamics


maximum Mach Courant Friedrichs-Lewy


effective compression ratio


grid length, m


time step, s


time delay, s


fault detection and diagnosis


fast Fourier transformation


probabilistic neural networks


adiabatic coefficient


homogeneous compression charge ignition


internal combustion


intake valve closure


premixed compression charge ignition


the gas constant, 287 J/(kg·K)


start of combustion


variable valve actuation


Wigner-Ville distributions


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Copyright information

© KSAE 2019

Authors and Affiliations

  • Fushui Liu
    • 1
    • 2
  • Zhongjie Shi
    • 1
  • Yikai Li
    • 1
    Email author
  • Yang Hua
    • 1
  • Yanlin Chen
    • 1
  • Yongli Gao
    • 1
  1. 1.Beijing Institute of TechnologySchool of Mechanical EngineeringBeijingChina
  2. 2.Beijing Electric Vehicle Collaborative Innovation CenterBeijingChina

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