Experimental investigation on a 3000 bar fuel injection system for a SCR-free non-road diesel engine. (1st May 2019)

• Record Type: Journal Article
• Authors: Boccardo, Giulio; Millo, Federico; Piano, Andrea; Arnone, Luigi; Manelli, Stefano; Fagg, Simon; Gatti, Paolo; Herrmann, Olaf Erik; Queck, Dirk; Weber, Jost
• Is Part Of: Fuel. Volume 243(2019)
• Page Start: 342
• Page End: 351
• Publication Date: 2019-05-01
• Subjects: Heavy-duty diesel engine -- 3000 bar fuel injection system -- Particle number -- After injection; AFR Air to Fuel Ratio -- APC AVL Particle Counter -- ASC Ammonia Slip Catalyst -- BSFC Brake Specific Fuel Consumption -- CA Crank Angle -- CR Common Rail -- DOC Diesel Oxidation Catalyst -- DPF Diesel Particulate Filter -- DR Dilution Ratio -- DT Dwell Time -- ECU Engine Control Unit -- EGR Exhaust Gas Recirculation -- EU European Union -- FIS Fuel Injection System -- FSN Filter Smoke Number -- HD Heavy Duty -- HRR Heat Release Rate -- ISFC Indicated Specific Fuel Consumption -- MFB50 Crank Angle at 50% Fuel Mass Burnt -- MSS MicroSoot Sensor -- NRSC Non Road Steady-State Cycle -- NRTC Non Road Transient Cycle -- OEM Original Equipment Manufacturer -- PN Particle Number -- SCR Selective Catalytic Reduction -- SM Smoke Meter -- SMPS Scanning Mobility Particle Sizer -- SOI Start of Injection -- TC Turbocharger -- TVCS Twin Vortex Combustion System -- WG Wastegate; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2019.01.122
• Languages: English
• ISSNs: 0016-2361

Abstract

Abstract: The upcoming Stage V emissions regulation for Non-Road Heavy Duty Diesel Engines will force OEMs to adopt Diesel Particulate Filters, adding a further degree of complexity to the aftertreatment system, which in several cases already includes specific devices for NOx reduction. Since complex aftertreatment systems can rise packaging problems as well as reliability issues, the authors evaluated the performance of a Stage V compliant engine layout which can avoid dedicated aftertreatment devices for NOx . This engine features a low pressure exhaust gas recirculation system, a two-stage turbocharger and a 3000 bar injection pressure-capable fuel injection system. This paper focus on the experimental assessment of the performance of the fuel injection system, demonstrating how increasing the rail pressure from 2000 to 3000 bar can dramatically improve the NOx -Soot and NOx -Particulate Number trade-off, together with the engine efficiency, without adversely affecting the emission of nanoparticles. In particular, extremely high injection pressures in conjunction with the use of after injection as a soot reduction technique, was found to be capable of achieving a 50% smoke reduction with a more than acceptable engine efficiency degradation.