Abstract
The Premixed Charge Compression Ignition, a Low Temperature Combustion strategy, is one of the most important ways to achieve very low pollutant emissions without to sacrifice power and fuel consumption. By using PCCI is possible reduce drastically NOx and Soot emissions simultaneously. Before this combustion process can be fully implemented in the serial Diesel Engine is necessary to solve some difficulties like the higher unburned HC and CO emissions as well as the early combustion phasing. In the present study, some strategies to solve this problem will be introduced. The first strategy was to find out experimental and with numerical methods the optimum spray cone angle, the second strategy was to find out the optimum piston bowl geometry and the third strategy was to find a good injection strategy. The combination of these strategies show that it is possible reduces drastically the pollutant emissions by PCCI combustion concept, which is used only for low load conditions. The high load conditions will be covering though the conventional diffusive combustion process. The transition between low to high load conditions should be done through the injection strategy by using of a combustion closed loop control, which is developing by the automatic control institute at the RWTH University, but in this paper will be not reported about this control system.
Keywords: Low Emissions, Low Temperature Combustion