Е-Публикации
Технически университет - София

Abstract: Despite the rapid transformation from fossil fuels to electrification in the passenger cars, internal combustion engines still play an important role in the propulsion due to well developed technology, higher autonomy and lower price. However, further integration in passenger cars strongly depends on the engine efficiency due to the progressively lower on-board CO2 emission target. Diesel engines offer better efficiency than gasoline engines, but their implementation is limited nowadays due to the expensive aftertreatment for reduction of PM and NOx. In this context low-temperature combustions (LTC) also known as homogeneous charge compression ignition (HCCI) offer much lower pollutant emissions due to the higher homogenization rate of the mixture and lower local temperature. Many researches revealed that implementation of pure HCCI would reduce PM and NOx near zero. However, pure HCCI limited the effective engine operating range due to the needs of precise control of the intake temperature and EGR rate. Thus, in order to increase the low-temperature combustion operating range a strategy for premixed charge compression ignition (PCCI) or pPCCI could be implemented. It means a compression ignition strategy with longer ignition delay period compared to conventional combustion in diesel engines. In this study, a numerical investigation of the impact of ignition delay period on combustion characteristic and pollutant formation was conducted. The engine under study is turbocharged direct injection diesel engines implemented to passenger cars.

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