A High Expansion Effects of Atkinson Cycle by adopting Variable Intake Valve Closing Timing with Compensated Intake Air-mass and Effective Compression Ratio.

흡입공기량 및 유호압축비 보상시 흡입밸브닫힘시기 변화에 의한 고팽창효과

To understand the high expansion effects by adopting intake closing time in the cases of compensating intake air-mass and effective compression ratio simultaneously, fundamental study was carried out by using RICEM realizing Atkinson cycle. Intake air-mass and effective compression ratio were compensated by increasing supercharged pressure and geometric compression ratio. The results showed that the increasing rates of expansion ratio and expansion-compression ratio were increased by compensating both a intake air-mass and effective compression ratio the same tendencies were obtained with the increases of compression ratio and cut off ratio It was also found that LIVC has more advantages in expansion ratio and effective work than those of EIVC under above conditions.