Method for optimizing the operating mode and combustion processes of a diesel engine

摘要

The invention concerns a method for optimizing the operating mode and combustion mode of a diesel engine with regard to a minimal emission of pollutants involving common rail injection and including the use of an exhaust gas turboblower. According to this method, fuel is injected into each combustion chamber of the diesel engine at least by one main injection (HE) and by one afterinjection (BOOST) that is subsequent to the main injection, and an electric control unit (ECU) and a mapping stored therein serve to control the start and the amount of the afterinjection (BOOST) according to the end of the main injection (HE) and control operating parameters of the diesel engine. The aim of the invention is to improve the aforementioned method in order to also enable the enthalpy of the exhaust gas to be increased in the short term so that the power output is increased on the exhaust gas turboblower and the air mass flow rate and the charge-air pressure are increased on the side of the blower by the mechanical coupling of the turbine and blower. To this end, the invention provides that the afterinjection (BOOST) is initiated between 30° and 180° KW after completion of the main injection (HE), and the amount of afterinjection (BOOST) is set between 20% and 30% of the amount of the main injection (HE).