To provide a two stage supercharging system for a diesel engine 1, which is provided with a high pressure stage turbocharger 6 and a low pressure stage turbocharger 5, and smoothly controls supercharging pressure.
The system is provided with an intake air amount grasping means for determining an intake air amount Qaw, a fuel injection amount grasping means for determining a fuel injection amount Qfv, an exhaust gas flow rate calculating means for determining an exhaust gas flow rate Vg2 based on the intake air amount Qaw and fuel injection amount Qfv, and an exhaust gas inflow rate control means for controlling an exhaust gas inflow rate Qb led to flow into a high pressure stage exhaust bypass channel 6e. The exhaust gas inflow rate control means controls the exhaust gas inflow rate Qb into the high pressure stage exhaust bypass channel 6e on the basis of the exhaust gas flow rate Vg2.
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Takashi Noguchi
Kazuhiko Saishita