An experimental study was carried out to analyze the influence of different post-injection strategies on the regulated and unregulated emissions from a heavy-duty compression ignition (CI) diesel engine. FTIR (Fourier transform infrared spectroscopy) was used to measure and analyze the exhaust emissions which include regulated such as NOx, soot, and unregulated emissions including acetaldehyde, formaldehyde, methane, ethane, propane, ethylene, propylene, and ethyne. Experimental results manifested that the post-injection technique can notably minimize the regulated and unregulated emissions as compared to a single main injection. Under different post-injection conditions, a trade-off relation was also found between soot and NOx emissions. In soot mitigation, the start of injection (SOI) at 40° crank angle (CA) incorporate with 5–15 mg post-injection fuel mass was proved very effective and about 26% lower soot emissions were recorded than single main injection. At SOI 20°CA, with 15 mg post-injection fuel mass, a reduction in the NOx emissions was observed up to 20% and in THC up to 60%. Unregulated emissions (other than formaldehyde and acetaldehyde) were found lower with 5, 10, and 15 mg post-injection fuel mass at 20, 40, 100, and 120°CA but increased at SOI of 60°CA than single main injection. In addition, light HCs, and THC emissions at SOI 60°CA were found to increase which could be beneficial for after-treatment devices.

进行了一项实验研究，以分析不同的后喷射策略对重型压燃式（CI）柴油机的调节和非调节排放的影响。FTIR（傅里叶变换红外光谱法）用于测量和分析废气排放，其中包括NOx，烟灰等法规排放，以及乙醛，甲醛，甲烷，乙烷，丙烷，乙烯，丙烯和乙炔等非法规排放。实验结果表明，与单次主喷射相比，后喷射技术可以显着减小调节和非调节排放。在不同的喷射后条件下，烟灰和NOx排放之间也存在折衷关系。在减轻烟灰中 事实证明，在40°曲柄角（CA）下开始喷射（SOI）并结合5–15 mg喷射后燃料质量是非常有效的，并且记录的烟尘排放量比单次主喷射低约26％。在20°CA的SOI下，喷油量为15 mg后，观察到NOx排放降低了20％，THC降低了60％。在20、40、100和120°CA时，喷射后燃料质量分别为5、10和15 mg时，发现未管制的排放量（甲醛和乙醛除外）更低，但在60°CA的SOI时，未控制排放量比单次主喷射增加。此外，发现SOI 60°CA下的轻质HC和THC排放增加，这可能对后处理设备有利。观察到NOx排放减少了20％，THC减少了60％。在20、40、100和120°CA时，喷射后燃料质量分别为5、10和15 mg时，发现未管制的排放量（甲醛和乙醛除外）更低，但在60°CA的SOI时，未控制排放量比单次主喷射增加。此外，发现SOI 60°CA下的轻质HC和THC排放增加，这可能对后处理设备有利。观察到NOx排放减少了20％，THC减少了60％。在20、40、100和120°CA时，喷射后燃料质量分别为5、10和15 mg时，发现未管制的排放量（甲醛和乙醛除外）更低，但在60°CA的SOI时，未控制排放量比单次主喷射增加。此外，发现SOI 60°CA下的轻质HC和THC排放增加，这可能对后处理设备有利。