포트 마스킹이 엔진의 배기에 미치는 영향

다국어 초록 (Multilingual Abstract)

To secure basic data for intake port design, effects of a port masking on the part load performance were investigated in a 4 valve SI engine. For this purpose, 9 kinds of masking, which have different shapes and masking ratio, are applied to the engine intake system. The characteristics of the performance were estimated through mixture response test at various engine load and speed. The results show that NOx emission, one of indexes for stratification, increases considerably in spite of retarded spark timing due to the stratification which is caused by unequal flow distribution between the two intake ports. The mechanism of stratification by masking is different from axial stratification and the fuel entering through masked port plays a very important role in this stratification process. In conclusion, the port masking method could be easily applied to engine intake system and be very effective for inducing the stratified charging without the change of port design.

참고문헌 (Reference)

1 K. Horie, "The Development of a High Fuel Economy and High Performance Four Valve Lean Burn Engine" SAE 1992

2 A. A. Quader, "The Axially-Stratified-Charge Engine" SAE 1982

3 G. T. Kalghatgi, "Spark Ignition, Early Flame Development and Cyclic Variation in IC Engines" SAE 1987

4 W. G. Lee, "Effects of Port Masking on Part Load Performance: Part II - Emission and Fuel Economy" 9 (9): 23-29, 2001

5 W. G. Lee, "Effects of Port Masking on Part Load Performance: Part I - Lean Misfire Limit" 9 (9): 17-22, 2001

6 I. Y. Ohm, "Advanced Internal Combustion Engines" A-Jin Publishing Company 2006