International Conference on Progresses in Automotive Technologies 2020, İstanbul, Türkiye, 28 - 29 Aralık 2020
Homogeneous charge compression ignition (HCCI) is a combustion concept with significant potential due to low NOX, soot emissions, and high efficiency. However, the PPCI strategy has potential because the HCCI engine operates in a limited load range and is difficult to control due to lack of spark ignition or fuel injection. Early direct injection during the compression process is an option within the PPCI concept. However, in this strategy, the spray angle should be applied narrower to prevent the fuel from impinging the cylinder wall. In this study, it was aimed to constitute a PCCI concept with a pre-, main- and post-injection strategy and injector with an 80-degree narrow spray angle. Two different injection strategies were proposed in order to minimize emission. These were compared with the conventional injection strategy under the same conditions. The partial premixed (PPCI) combustion process was investigated in terms of combustion efficiency, fuel consumption, and emissions. The engine emits significantly low NOX emissions with the PPCI combustion strategy.