Influence of direct injected timing on the performance in a spark ignited dual-injection gasoline engine for an automotive under various injection modes

Changming Gong, Jiawei Yu and Fenghua Liu

Energy, 2025, vol. 319, issue C

Abstract: Influence of direct injected timing (DIT) on the performance in a spark ignited port- and direct-injected (PI and DI) gasoline engine was studied experimentally. The results show that the best BMEP (brake mean effective pressure) and BTE (brake thermal efficiency) can be obtained at DIT = 280°CA bTDC. At a constant DIT, the BMEP and BTE of DI50 (50 % PI and 50 % DI of gasoline) injection mode (IM) are higher than those of DI100 (0 % PI and 100 % DI of gasoline) IM. The highest cylinder pressure, highest heat release rate and highest cylinder temperature can also achieve the maximum at DIT = 280°CA bTDC and various IMs, and their crank angle (CA) positions are closer to TDC (top dead center). The PI + DI IM is more propitious to ameliorate the combustibility of engine and carry out more stable combustion than DI IM. The DIT and IM have a significant influence on CO and NOX emissions. The DIT has a little influence and IM has an crucial influence on HC emission. The soot emission increases slightly with delayed DIT at DIT>80°CA bTDC, and then increases rapidly with further delayed DIT at DIT<80°CA bTDC.

Keywords: Automotive spark ignited engine; Port- and direct-injected gasoline; Direct injected timing; Performance; Injection mode (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:319:y:2025:i:c:s0360544225007911

DOI: 10.1016/j.energy.2025.135149

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