摘要
基于传统汽油机的实测数据建立GT-POWER模型;分析改进成Atkinson循环发动机的节油潜力及爆震指数。先选择3种方案并利用GT-POWER模型对部分负荷与万有特性对Atkinson循环进行计算,3种方案分别为:(1)只用可变气阀正时(VVT)技术推迟进气阀关闭时刻;(2)增加凸轮型线包角并用VVT技术推迟进气阀关闭时刻,(3)在第二方案上将压缩比由10增加到12。计算结果表明:方案三节油效果明显,在5个典型工况及全转速范围上中小负荷节油率达7%以上。再分析推迟排气阀开启时刻对实现部分负荷节油基本没有应用价值;传统汽油机改进成Atkinson循环发动机的最佳方案为增加进气凸轮型线包角使进气持续期为350o,用VVT技术推迟进气阀关闭时刻来调节负荷,再将压缩比由10增加到12,而排气凸轮型线及相位不变。
To study the fuel saving effect of the Atkinson cycle engine, a GT-POWER simulation model was built and calibrated against experimental data; the fuel saving potential and the knock intensity were analyzed after the engine was improved into Atkinson cycle. Firstly, three means were studied and modeled. （1） Delay intake valve timing by variable valve timing （VVT）; （2） Increase intake duration to 350° with delaying intake valve timing by VVT; （3） Add geometry compress ratio from 10 to 12 on top of the second method. The results demonstrate that the third method has the obvious fuel saving effect, in which fuel saving ratio exceeds 7% on five typical conditions and at all speeds with low and middle load. Secondly, some work was done to analyze the fuel saving effect of delaying exhaust valve timing on partial loads, and little effect was discovered by this means. The most effective method is increasing intake duration to 350o based on the crankshaft angle, delaying the intake valve closing time to adjust the load by VVT and adjusting the geometry compress ratio from 10 to 12, while the exhaust structure and valve timing remain unchanged.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第4期1302-1311,共10页
Journal of Central South University:Science and Technology
基金
国家高技术研究发展计划("863"计划)项目(2012AA111801
2012AA111703)
