吉林大学学报(工学版) ›› 2011, Vol. 41 ›› Issue (增刊1): 47-52.

• paper • Previous Articles     Next Articles

CAI combustion comparison between NVO strategy and EGRB strategy

LI Hua1, CHENG Peng1, TAN Man-zhi1, GU Yan-hua1, WANG Hui2, PENG Ya-ping3, GUO Ying-nan1   

  1. 1. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China;
    2. Beijing Polytechnic College, Beijing 100042, China;
    3. System and Function Development Technical Center, United Automotive Electronic Systems Co, Ltd, Shanghai 201206, China
  • Received:2011-04-25 Online:2011-09-01 Published:2011-09-01

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Abstract:

On the basis of self-developed electro-hydraulic variable valve train,controlled auto-ignition(CAI)was achieved under two different EGR strategies on a modified single cylinder engine.Stable CAI operating ranges of these two valve timing scenarios were obtained by plotting tested operating points.Within the operating range,engine performances and combustion features were analyzed.The experimental results indicate that operating range of NVO strategy,allowing more substantial adjustment of valve phase,is wider than that of EGRB strategy at fixed engine speed of 1000 r/min.The maximum BMEP of EGRB strategy slightly exceeds the NVO strategy.Moreover,brake thermal efficiency exceeds 30% in most of these two operating range,higher than conventional engine,with an extremely low NOx emission at the same time.Besides,start of combustion of CAI under NVO strategy is a little advanced and combustion duration is a little shorter compare with that of EGRB strategy.

Key words: power machinery and engineering, controlled auto-ignition, negative valve overlap, exhaust gas rebreathing, variable valve train, combustion feature

CLC Number: 

  • TK421


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