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엄인용(Inyong Ohm),명차리(Chalee Myung) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
A PlV (Particle Image Yelocimetry) was applied to measure in-cylinder velocity field according to intake flow characteristics that were defined by steady flow bench. Two engines, one is conventional DOHC 4 valve and the other is high swirl lean combustion., were used to compare real swirl and tumble flow. Swirl and tumble ratios were also calculated from the velocity by momentum and energy method.<br/> The results show that the swirl flow patterns become more and more complicated as the measuring plane is far from the TDC and the tumble flow is more clearly observed under the one port deactivation condition. In high swirl condition, unexpected reverse tumble flow is observed during compression. The swirl ratio has higher value at BDC timing and the strength of tumble steadily decreases from the early stage of intake.
실화가스 흐름에 대한 광역 산소센서의 응답특성 및 이를 이용한 실화감지
정영교(Youngkyo Chung),최상민(Sangmin Choi),배충식(Coongsik Bae),명차리(Chalee Myung) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.2
To understand the signal fluctuation of a wide-range oxygen sensor installed at the exhaust confluence point, when a misfiring is triggered in a cylinder, the steady state and the transient response characteristics of the sensor to the flow of the misfired gas were investigated quantitatively. It was recognized that the steady state output voltage of the sensor increased higher when it contacted the misfired gas even though the fueling condition was the same as the normal combustion case and this characteristic enabled the application of the wide-range oxygen sensor for the misfire detection. The transient response was compared at different engine speeds and it was found that the response speed increased with the engine speed. The signal fluctuation was also estimated quantitatively, using these steady state and transient response of the sensor, and the estimated signal showed satisfactory correlation with the measurements.