LOW EMISSION DIESEL COMBUSTION SYSTEM

摘要

This invention sets forth a commercially viable diesel combustion system tha t meets environmentally acceptable levels of NOx emissions (i.e. 0.2g/bhp-hr o r lower across a full map of engine speeds and loads) without the need for use of Nox aftertreatments, and simultaneously maintains engine-out PM emissions relatively close (e.g. with smoke levels at or below 3 BSN) to environmental ly acceptable PM post-aftertreatment levels. The invention achieves these resul ts by operating within a unique combination of parameters. These parameters comprise: (1) charge-air oxygen concentration below 16% preferably between 1 0% and 15%, more preferably between 11.5% and 14%, and most preferably between 12% and 13.5% for virtually all engine operating conditions (but not necessarily at no-load or low load conditions), (2) fuel injection pressures at or exceeding 1800 bar, preferably exceeding 2100 bar, more preferably exceeding 2300 bar, and most preferably exceeding 2500 bar, at most engine speeds an loads, and (3) charge-air mass/fuel mass ratio between 25:1 and 45 :1 for medium and high loads. Furthermore, the system is preferably run continuously slightly lean of stoichiometry, providing just enough excess oxygen to facilitate completeness of combustion and to maintain an exhaust oxygen concentration sufficient for continuous trap regeneration at a balanc e point in operation.