ETCI(Exhaust Top dead center Injection Compression Ignition)燃烧利用负气门重叠产生的高温残余废气对高压喷入的燃油进行加热促进蒸发,实现了HCCI燃烧。基于ETCI的燃烧模式,研究了排气正时以及增压压力等参数对燃烧过程的影响。试...ETCI(Exhaust Top dead center Injection Compression Ignition)燃烧利用负气门重叠产生的高温残余废气对高压喷入的燃油进行加热促进蒸发,实现了HCCI燃烧。基于ETCI的燃烧模式,研究了排气正时以及增压压力等参数对燃烧过程的影响。试验结果表明,排气正时对燃烧特性有较大的影响,利用排气正时控制残余废气率和IVC时刻缸内平均温度可间接实现燃烧相位的控制;在自然排气状态下,进气压力的升高增大了过量空气系数、可小幅度降低IVC时刻缸内残余废气与新鲜空气的混合气的平均温度,在一定范围内实现燃烧相位的控制。通过不同排气正时下合理的增压压力配合可实现燃烧相位的有效控制并降低排放。展开更多
介绍一种采用汽油直接喷射系统和双连续可变气门正时控制系统的新1.6 L 4缸涡轮增压汽油机。较高的环境性能要求迫使汽油机必需进一步提高效率。同时,改善动力性能对于增强车型的竞争力及市场的认知度十分重要。为了满足上述要求,开发...介绍一种采用汽油直接喷射系统和双连续可变气门正时控制系统的新1.6 L 4缸涡轮增压汽油机。较高的环境性能要求迫使汽油机必需进一步提高效率。同时,改善动力性能对于增强车型的竞争力及市场的认知度十分重要。为了满足上述要求,开发了一种1.6 L直接喷射涡轮增压汽油机。通过采用多种减摩技术,该机型达到了与2.5 L自然吸气汽油机相同的高动力性能,而且其较低的燃油耗可与排量较小的汽油机相媲美。此外,该汽油机达到了美国低排放车第2阶段-超低排放车和欧5排放法规要求的低尾气排放性能。该汽油机已被命名为MR16DDT,第1款配装MR16DDT汽油机的车型是Juke。详细介绍了该款新型汽油机采用的各项技术。展开更多
Ignition timing control is of great importance in homogeneous charge compression ignition engines. The effect of hydrogen addition on methane combustion was investigated using a CHEMKIN multi-zone model. Results show ...Ignition timing control is of great importance in homogeneous charge compression ignition engines. The effect of hydrogen addition on methane combustion was investigated using a CHEMKIN multi-zone model. Results show that hydrogen addition advances ignition tim- ing and enhances peak pressure and temperature. A brief analysis of chemical kinetics of methane blending hydrogen is also performed in order to investigate the scope of its appli- cation, and the analysis suggests that OH radical plays an important role in the oxidation. Hydrogen addition increases NOx while decreasing HC and CO emissions. Exhaust gas recir- culation （EGR） also advances ignition timing; however, its effects on emissions are generally the opposite. By adjusting the hydrogen addition and EGR rate, the ignition timing can be regulated with a low emission level. Investigation into zones suggests that NOx is mostly formed in core zones while HC and CO mostly originate in the crevice and the quench layer.展开更多
文摘ETCI(Exhaust Top dead center Injection Compression Ignition)燃烧利用负气门重叠产生的高温残余废气对高压喷入的燃油进行加热促进蒸发,实现了HCCI燃烧。基于ETCI的燃烧模式,研究了排气正时以及增压压力等参数对燃烧过程的影响。试验结果表明,排气正时对燃烧特性有较大的影响,利用排气正时控制残余废气率和IVC时刻缸内平均温度可间接实现燃烧相位的控制;在自然排气状态下,进气压力的升高增大了过量空气系数、可小幅度降低IVC时刻缸内残余废气与新鲜空气的混合气的平均温度,在一定范围内实现燃烧相位的控制。通过不同排气正时下合理的增压压力配合可实现燃烧相位的有效控制并降低排放。
文摘介绍一种采用汽油直接喷射系统和双连续可变气门正时控制系统的新1.6 L 4缸涡轮增压汽油机。较高的环境性能要求迫使汽油机必需进一步提高效率。同时,改善动力性能对于增强车型的竞争力及市场的认知度十分重要。为了满足上述要求,开发了一种1.6 L直接喷射涡轮增压汽油机。通过采用多种减摩技术,该机型达到了与2.5 L自然吸气汽油机相同的高动力性能,而且其较低的燃油耗可与排量较小的汽油机相媲美。此外,该汽油机达到了美国低排放车第2阶段-超低排放车和欧5排放法规要求的低尾气排放性能。该汽油机已被命名为MR16DDT,第1款配装MR16DDT汽油机的车型是Juke。详细介绍了该款新型汽油机采用的各项技术。
基金This work was supported by the Natural Science Foundation of Anhui Province （No.090412030）.
文摘Ignition timing control is of great importance in homogeneous charge compression ignition engines. The effect of hydrogen addition on methane combustion was investigated using a CHEMKIN multi-zone model. Results show that hydrogen addition advances ignition tim- ing and enhances peak pressure and temperature. A brief analysis of chemical kinetics of methane blending hydrogen is also performed in order to investigate the scope of its appli- cation, and the analysis suggests that OH radical plays an important role in the oxidation. Hydrogen addition increases NOx while decreasing HC and CO emissions. Exhaust gas recir- culation （EGR） also advances ignition timing; however, its effects on emissions are generally the opposite. By adjusting the hydrogen addition and EGR rate, the ignition timing can be regulated with a low emission level. Investigation into zones suggests that NOx is mostly formed in core zones while HC and CO mostly originate in the crevice and the quench layer.
