Details

Autor(en) / Beteiligte

• Park, Cheolwoong
• Kim, Yongrae
• Oh, Junho
• Choi, Jiseon
• Choi, Young

Titel

Effect of fuel injection timing on performance and emissions with a dedicated direct injector in a hydrogen engine

Ist Teil von

• Energy conversion and management. X, 2023-04, Vol.18, p.100379, Article 100379

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •The torque with HDI is improved by up to 35.9% compared to that with GDI.•As the fuel injection timing is retarded, the thermal efficiency increases.•A locally rich mixture, which increases NOx, is formed under retarded fuel injection timing.•Combustion of oil produces CO2 and CO2 is proportional to the load. In this study, hydrogen fuel was injected directly into a cylinder using a prototype of a dedicated hydrogen direct injector (HDI). The effects of fuel injection timing and amount of hydrogen fuel injected on engine output performance and emissions (e.g., nitrogen oxides and carbon dioxide) were investigated by varying the fuel injection timing from before top dead center (BTDC) 190 crank angle degree (CAD) toward BTDC 60 CAD. Strategies for maximizing the engine’s output performance when an after-treatment system for nitrogen oxide removal catalysts is not used were assessed. When using the HDI, a torque improvement result (up to 35.9%) can be obtained even under the condition that the hydrogen supply pressure was half as low as compared to the case of using a gasoline direct injector for hydrogen fuel. Under the condition of retarded fuel injection timing, a locally rich mixture is formed to increase the emission of nitrogen oxides at a level of 50 ppm or higher. The engine oil is burned to affect the emission of carbon dioxide (CO2), which is proportional to the load.