Valve Train Improvement of Atkinson Cycle Engine

REN Cuicui; ZHANG Yi; YANG Jing; ZHAO Lulu; TANG Jian; LUO Yani

doi:10.3969/j.issn.10012222.2017.05.004

Vehicle Engine ›› 2017, Vol. 0 ›› Issue (5) : 16-20. DOI: 10.3969/j.issn.10012222.2017.05.004

Valve Train Improvement of Atkinson Cycle Engine

REN Cuicui1,ZHANG Yi2，YANG Jing1,ZHAO Lulu1,TANG Jian1，LUO Yani1

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Abstract

Based on the requirements of improving fuel economy, the traditional Ottocycle engine was changed into Atkinsoncycle engine. The design of valve train mechanism was very important for cycle modification. The model of valve train mechanism for gasoline engine was built, the kinematics and dynamics analysis were conducted, the cam profile was optimized and the valve timing was redesigned. By using DVVT of intake and exhaust camshaft, the optimal control design of DVVT for the optimized engine was conducted under different loads and speeds. Finally, the bench test results showed that the modification of engine cycle was successful. The optimal specific fuel consumption of original engine decreased from 250 g/(kW·h) to 232 g/(kW·h) and low fuel consumption area moved to the normal working area of the engine, which verified the accuracy and effectiveness of the design method of valve train.

Key words

Atkinson cycle / cam profile / valve timing / variable valve train mechanism

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REN Cuicui,ZHANG Yi，YANG Jing,ZHAO Lulu,TANG Jian，LUO Yani. Valve Train Improvement of Atkinson Cycle Engine[J]. Vehicle Engine. 2017, 0(5): 16-20 https://doi.org/10.3969/j.issn.10012222.2017.05.004