Advanced Combustion Operation in a Compression Ignition Engine

• Published in: Energy & fuels Vol. 23; no. 1; pp. 143 - 150
• Main Authors: Lilik, Gregory K, Herreros, José Martín, Boehman, André L
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 22.01.2009
• Subjects: Applied sciences; Combustion; Energy; Energy. Thermal use of fuels; Engines and turbines; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Nitrogen oxide; Particle size distribution; Particle emission; Ignition; Carbon dioxide; Aerosols; Diesel engine; Combustion; Compression ignition engine; Combustion efficiency; Comparative study; Direct injection
• ISSN: 0887-0624; 1520-5029
• DOI: 10.1021/ef800557d

In this study, advanced combustion operating modes were investigated on a DDC/VM Motori 2.5 L, four-cylinder, turbocharged, common rail, direct-injection light-duty diesel engine, with exhaust emission being the main focus. The engine was operated under a partially premixed charge compression ignition (PCCI) mode, referred to as high-efficiency clean combustion (HECC), in which NO x and PM emissions dramatically decreased while fuel economy was maintained. In comparison to the default baseline operation at the given speed and load, the HECC mode reduced brake-specific NO x emissions by 72.1%, reduced brake-specific NO emissions by 83.2%, reduced brake-specific NO2 emissions by 33.8%, increased brake-specific HC emissions by 73.9%, increased brake-specific CO emissions by 105.6%, increased brake-specific CO2 emissions by 55.9%, reduced brake-specific PM emissions by 80.7%, and reduced brake-specific fuel consumption by 3.6%. The particle size distribution in the vicinity of the HECC operating mode consists almost entirely of an organic aerosol, and the solid phase of the particles becomes vanishingly small.