Effects of Miller Cycle by LIVC on a Lean-Burn Natural Gas Engine Performance
(0) The effects of Miller Cycle on a lean-burn natural gas engine performance are studied using a GTPower model.Miller cycle is based on changing the intake valve closing time to achieve high expansion ratio than compression ratio,therefore it can improve the thermal efficiency and fuel economy to some extent.In this paper,some engine parameters such as increased compression ratio and late intake valve closing time are considered in effort to improve engine perfomance.The results showed that the power output is slightly decreased due to the back flow of the charge,the boost pressure and ignition timing can be modified to make up the power.Intake valve closing timing plays an important role in improving thermal efficiency and decreasing specific fuel consumption.As a result,the thermal efficiency and the specific fuel consumption could be improved by 2.52% and 2.46% respectively.
natural gas engine Miller cycle compression ratio late intake valve closing
Cheng Yang Ying Gao Xuehui Shi Jun Li
State Key Laboratory of Automotive Simulation and Control, Changchun, China, 130025
国内会议
北京
英文
98-101
2012-11-01（万方平台首次上网日期，不代表论文的发表时间）