The influence of the variable compression ratio mechanism on gasoline engine performance

被引：0

作者：

Lin, Cheng-Bo ^{[1
,2
]}

Liu, Jing-Ping ^{[1
,2
]}

Tang, Qi-Jun ^{[1
,2
]}

Fu, Jian-Qin ^{[1
,2
]}

Shen, Da-Zi ^{[3
]}

Luo, Hai-Peng ^{[1
,2
]}

机构：

[1] Research Center for Advanced Powertrain Technology, Hunan University, Changsha

[2] Hunan Peteco Co., Ltd., Changsha

[3] Shanghai Dazi Mechanical Technology Co., Ltd., Shanghai

来源：

Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | 2015年 / 36卷 / 06期

关键词：

Compression ratio; Expansion ratio; Gasoline engine; IC engine; Knocking; Pumping loss;

D O I：

10.13949/j.cnki.nrjgc.2015.06.014

中图分类号：

学科分类号：

摘要：

The kinematics of piston movement was analyzed based on an eccentric mechanism of crank connecting rod journal for a variable compression ratio (VCR). According to the experimental data of a 1.6 L naturally aspirated gasoline engine, a simulation model was set up and calibrated using GT-Power platform to predict how this VCR mechanism affected the engine part-load performances. The simulation results show that with this VCR mechanism, the lengths of four piston strokes of engine working cycle can be diverse from each other, which leads to the expansion ratio larger than the compression ratio. Under the same load condition, pumping loss is reduced due to the speeding up of gas expansion. The knocking tendency increases rapidly when the compression ratio is larger than 16. Under the same conditions of knocking tendency and power output, this VCR mechanism can reduce the engine fuel consumption rate by 5% to 10%. © 2015, Chinese Society for Internal Combustion Engines. All right reserved.

引用

页码：84 / 90

页数：6

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