Influence of injection rate shaping on combustion and emissions for a medium duty diesel engine

This paper describes the effects of injection rate shaping on the combustion, fuel consumption and emission of NOX and soot of a medium duty diesel engine. The focus is on the influence of four different injection rate shapes; square type 1, square type 2, boot and ramp, with a variation of maximum injection pressure and start of injection (SOI). The experiments were carried out on a 1 liter single cylinder research diesel engine equipped with an amplifier-piston common rail injection system, allowing the adjustment of the injection pressure during the injection event and thus injection rate as desired. Two strategies to maintain the injected fuel mass constant were followed. One where rate shaping is applied at constant injection duration with different peak injection pressure and one strategy where rate shaping is applied at a constant peak injection pressure, but with variable injection duration. Injection rate shaping was found to have a large effect on the premixed and diffusion combustion, a significant influence on NOx emissions and depending on the followed strategy, moderate or no influence on soot emission. Only small effects on indicated fuel consumption were found.

[1]  Sangjin Sim,et al.  Effect of the injection parameters on diesel spray characteristics , 2005 .

[2]  K. B. Binder,et al.  Analysis of mixture formation, combustion and pollutant formation in HD diesel engines using modern optical diagnostics and numerical simulation , 1999 .

[3]  Masahiro Ishida,et al.  Diesel Combustion Analysis Based on Two-Zone Model. (Comparison between Model Analysis and Experiment). , 1996 .

[4]  R. Reitz,et al.  Optimization of Injection Rate Shape Using Active Control of Fuel Injection , 2004 .

[5]  Anders Karlsson,et al.  Flame liftoff in diesel sprays , 1996 .

[6]  José M. Desantes,et al.  Influence of the EGR Rate, Oxygen Concentration and Equivalent Fuel/Air Ratio on the Combustion Behaviour and Pollutant Emissions of a Heavy-Duty Diesel Engine , 2000 .

[7]  John B. Heywood,et al.  Internal combustion engine fundamentals , 1988 .

[8]  Choongsik Bae,et al.  Hydraulic Simulation and Experimental Analysis of Needle Response and Controlled Injection Rate Shape Characteristics in a Piezo-driven Diesel Injector , 2006 .

[9]  Kazutoshi Mori,et al.  Common Rail Fuel Injection System for Improvement of Engine Performance on Heavy Duty Diesel Engine , 1998 .

[10]  R Christian,et al.  A New Method for the Filter Smoke Number Measurement with Improved Sensitivity. , 1993 .

[11]  K. Akihama,et al.  Mechanism of the Smokeless Rich Diesel Combustion by Reducing Temperature , 2001 .

[12]  A. Aradi,et al.  A study of ignition delay of diesel fuel sprays , 2000 .

[13]  Franz Chmela,et al.  Pressure Modulated Injection and Its Effect on Combustion and Emissions of a HD Diesel Engine , 1995 .

[14]  O. Armas,et al.  Diagnosis of DI Diesel combustion from in-cylinder pressure signal by estimation of mean thermodynamic properties of the gas , 1999 .

[15]  T. Ahmad,et al.  APPLICATION OF FLAME TEMPERATURE CORRELATIONS TO EMISSIONS FROM A DIRECT-INJECTION DIESEL ENGINE , 1983 .

[16]  Keiki Tanabe,et al.  Flexibly Controlled Injection Rate Shape with Next Generation Common Rail System for Heavy Duty DI Diesel Engines , 2000 .

[17]  Wilhelm Bosch,et al.  The Fuel Rate Indicator: A New Measuring Instrument For Display of the Characteristics of Individual Injection , 1966 .

[18]  Vicente Bermúdez,et al.  Sensitivity of diesel engine thermodynamic cycle calculation to measurement errors and estimated parameters , 2000 .

[19]  Rolf D. Reitz,et al.  Reducing Particulate and NOx Using Multiple Injections and EGR in a D.I. Diesel , 1995 .

[20]  Yongrae Kim,et al.  A study on the behavior of evaporating diesel spray using LIEF measurement and kiva code , 2004 .

[21]  Jin-wook Lee,et al.  Effects of needle response on spray characteristics in high pressure injector driven by piezo actuator for common-rail injection system , 2005 .

[22]  Tong Seop Kim,et al.  Analysis of design and part load performance of micro gas turbine/organic Rankine cycle combined systems , 2006 .

[23]  C. Arcoumanis,et al.  Analysis of Consecutive Fuel Injection Rate Signals Obtained by the Zeuch and Bosch Methods , 1993 .

[24]  Hiroshi Ishiwata,et al.  Recent progress in rate shaping technology for diesel in-line pumps , 1994 .

[25]  Roger Sierens,et al.  The Physical and the Chemical Part of the Ignition Delay in Diesel Engines , 1996 .

[26]  Kwang-Yong Kim,et al.  Flow and convective heat transfer analysis using RANS for a wire-wrapped fuel assembly , 2006 .

[27]  Rsg Rik Baert,et al.  Efficient EGR Technology for Future HD Diesel Engine Emission Targets , 1999 .

[28]  Rolf D. Reitz,et al.  Measurement of the Effect of Injection Rate and Split Injections on Diesel Engine Soot and NOx Emissions , 1994 .

[29]  J. Heywood,et al.  Experimental and Theoretical Study of Nitric Oxide Formation in Internal Combustion Engines , 1970 .

[30]  Raul Payri,et al.  Determination of diesel sprays characteristics in real engine in-cylinder air density and pressure conditions , 2005 .