The potential of RCCI concept to meet EURO VI NOx limitation and ultra-low soot emissions in a heavy-duty engine over the whole engine map

FUEL

卷:159

Article

Benajes, Jesus¹  Pastor, Jose V.¹  Garcia, Antonio¹  Monsalve-Serrano, Javier¹ 

[1] Univ Politecn Valencia, CMT Motores Termicos, Valencia 46022, Spain

关键词: Reactivity controlled compression ignition;    EURO VI;    Efficiency;    Dual fuel;    Engine map;   

DOI  :  10.1016/j.fuel.2015.07.064

来源: Elsevier

【 摘 要 】

This work investigates the potential of RCCI concept to achieve ultra-low NOx and soot emissions over a wide range of engine speed and loads. For this purpose, a detailed experimental methodology has been defined and applied in a heavy-duty single-cylinder engine fueled with diesel and gasoline. In addition, to assess the influence of the engine compression ratio on RCCI capabilities two different compression ratios, 14.4:1 and 11:1, have been tested. Results suggest that a low compression ratio allows to fulfill all the self-imposed constraints (maximum cylinder pressure rise rate of 25 bar/CAD, NOx < 0.4 g/kW h and soot* < 0.01 g/kW h) from idle to full load and engine speeds from 900 to 1800 rpm. However, the use of higher compression ratio requires a delayed injection strategy to avoid excessive knocking levels, which results in unacceptable soot emissions at loads higher than 50%, even when gasoline fractions around 90% are used. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free