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Zhu G.,Hunan University | Zhu G.,Hunan Peteco Technology Company Ltd | Xia X.,Hunan University | Xia X.,Hunan Peteco Technology Company Ltd | And 4 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2014

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 350° 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. Source

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