【摘要】 通过喷油控制实现了双模式柴油机燃烧模式等指示平均有效压力(Indicated Mean Effective Pressure,IMEP)运行,在此基础上通过在均值充量压燃(Homogeneous Charge Compression Ignition,HCCI)燃烧循环中引入排气再循环(Exhaust Gas Recirculation,EGR),推迟HCCI燃烧相位,进一步实现了燃烧模式等IMEP运行基础上的等CA50切换,并重点研究了EGR切换策略对燃烧模式切换过程中CA50平顺性的影响,确定了最优的EGR切换策略。试验结果表明,CI-HCCI燃烧模式切换过程,最优的EGR切换策略为无量纲循环数σCI-HCCI等于4.8方案,COVCA50仅为16.4%,较同时切换时减小了28%;HCCI-CI燃烧模式切换过程,最优的EGR切换策略为无量纲循环数σHCCI-CI等于0.6方案,COVCA50仅为13.8%,较同时切换时减小了30.3%。更多还原

【Abstract】 EGR is effective for delaying the combustion phase(CA50). Combustion mode switching under the same CA50 was realized by introducing EGR in HCCI combustion. Effects of EGR switching strategy on the smoothness of CA50 during mode switching process were studied experimentally. The results show that for the optimal EGR switching strategies for CI-HCCI and HCCI-CI mode switching, σCI-HCCIand σHCCI-CIare respectively equal to 4.8 and 0.6, and the COV of CA50 during mode switching process is respectively decreased to 16.4% and 13.8%, and respectively reduced by 28% and 30.3% compared to simultaneous switching levels.更多还原