中文摘要：

以节能与超低排放为目标，在一台CA6DL2—35E3高压共轨重型柴油机上借助ETAS标定系统及CFD模拟软件耦合废气再循环（EGR）及喷油规律柔性控制，试验研究与模拟分析EGR实现低温燃烧模式超低排放的可行性。结果表明：基于多段喷射协同优化缸内流动特性、化学氛围、热氛围的燃烧模式可以理解成时间意义上的分区燃烧；三段喷射协调优化缸内流动状态与化学氛围迁移实现全转速范围内时间分区燃烧的适用工况达60％；依据EGR延长预混时间、抑制燃烧速率的双重作用及后喷给EGR提供碳烟裕量的特性，EGR介入后实现了低燃烧噪声的低温燃烧模式。

英文摘要：

Aimed at energy-saving and ultra-low emissions, the feasibility of low temperature combustion （LTC） was attempted by flexible injection control coupling exhaust gas recirculation （EGR） through experimentally and numerically in a CA6DL2-35E3 common rail HD diesel engine. Results show that multi-injection coupling with optimization in in-cylinder flow characteristic, chemo-atmosphere and thermo-atmosphere can be regarded as the time sequence combustion. Three-stage injection coupling with optimization in in-cylinder flow and chemical atmosphere migration realizes 60% load operation covering whole engine speed under time sequence combustion. Considering double effect of EGR on extending premixed time and restraining combustion rate as well as allowance of EGR to soot, low combustion noise and low temperature combustion is achieved with EGR introduced.