| ONLINE MEASURING METHOD FOR THE ENGINES’ IVC TIMING
BASED ON THE IN-CYLINDER PRESSURE FLUCTUATION |
| Fushui Liu, Zhongjie Shi, Yikai Li, Yang Hua, Yanlin Chen, Yongli Gao |
| Beijing Institute of Technology |
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| ABSTRACT |
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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 |
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Corresponding Author.
Yikai Li , Email. 
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