(1) Pilot injection
โข Pilot injection entails the injection of an extremely small amount of fuel ahead of the main injection.
โข Pilot injection suppresses heat generation early in the injection cycle and thus suppresses NOx generation and noise at the start of combustion.
(2) Split injection control
โข Split injection entails the injection of an extremely small amount of fuel two or more times ahead of the main injection.
โข This improves the ignitability of fuel and realizes better startability at cold engine and reduction of HC at low-load operation.
(3) Post injection
โข Fuel injection control for diesel particular filter regeneration is performed in such a way, with early post injection and late post injection added after conventional fuel injection (main injection), exhaust gas temperature is increased to burn out particulate matter (PM) collected in the DPF.
