吸附还原法还原过程中空燃比控制策略的试验研究  

Experimental Study on Air Fuel Ratio Control Strategy of Lean Burn S.I. Engine during Reduction Regeneration Process with NO_x Adsorber Reduction Catalytic Method

作　　者：李晶华[1] 李志军[2] 张延峰[2] 王璇[2] 黎苏[1] 刘波[1] 

机构地区：[1]河北工业大学机械工程学院 [2]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《内燃机学报》2008年第4期330-334,共5页Transactions of Csice

基　　金：国家高技术研究发展计划资助项目(2008AA06Z322);国家自然科学基金资助项目(50776062,50506021)

摘　　要：运用研制设计的新型稀燃尾气催化系统和恒转矩电控系统,对稀NOx吸附还原催化器(LNT)还原过程中空燃比大小和浓、稀燃时间比值及长短对稀燃发动机性能进行了试验研究,结果表明:还原过程空燃比大小和稀、浓燃时间比值及长短不仅对发动机的输出转矩大小、燃油消耗率等性能有影响,而且对发动机的排放特性也有重要影响。稀NOx吸附还原催化器还原过程空燃比越小和浓、稀燃时间比值越大、浓燃还原时间越长,NOx还原越彻底,NOx排放越低,但稀燃发动机的比油耗稍变大,经济性变差。因此,在应用LNT降低稀燃发动机NOx排放时,需要对其还原过程空燃比大小和浓、稀燃时间比值及长短进行优化。The new-style lean burn adsorber-reduction-catalytic system and the invariable torsion lean burn electronic control system were developed. Experimental study of air/fuel （α） control strategy that＇s different α ratio and absolute reduction-regeneration period time in adsorber-reduction-catalytic converter on the performance of lean burn engine were conducted. The results show that different α ratio and absolute reduction-regeneration period time have an important effect on the emission characteristic, the torsion and BSFC. Small α ratio and long reduction-regeneration period time correspond to high NOx adsorbed in the catalytic converter. Decreasing NOx emission at lean operation accompanies the increase in BSFC. When LNT catalytic systems are used, the α ratio and absolute reduction-regeneration period time during reduction-regeneration process need to be optimized.

关 键 词：稀NOx吸附还原催化器 空燃比 浓、稀燃时间比值 性能 

分 类 号：TK411.25[动力工程及工程热物理—动力机械及工程]