Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Effects of injection timing on performance, combustion and emissions of a gasoline DI engine
Submission Author:
Vitor Cogo , RS
Co-Authors:
Thompson Diordinis Metzka Lanzanova, Macklini Dalla Nora, André Aronis, Mario Martins, Vitor Cogo
Presenter: Vitor Cogo
doi://10.26678/ABCM.COBEM2017.COB17-1496
Abstract
With the purpose of achieving better fuel efficiency, gasoline direct injection (DI) has been implemented on spark ignition internal combustion engines. A great advantage of this fuel injection method compared to port fuel injection (PFI) is the charge cooling effect and better fuel atomization process due to the greater pressure, which may reduce knock tendency. In this work, the injection timing in a DI engine was varied within the intake stroke to investigate its effects on engine performance, combustion event, and gaseous emissions. The trade-off between indicated efficiency and emissions was sought by using a side-mounted multi-hole gasoline injector. The fuel pressure was kept constant at 14.5±0.5 MPa and its temperature at 295±5 K. The results showed that later injection timings during the intake stroke resulted in more pronounced charge cooling effect, thus providing reduction of oxides of nitrogen (NOx) emissions. However, higher combustion duration were observed and more advanced spark timings were made necessary to maintain the optimum combustion phasing.
Keywords
gasoline direct injection, homogeneous charging, spark ingnition combustion
