To improve driveability without increasing exhaust emission by controlling exhaust gas recirculation means and a centrifugal supercharger of variable nozzle type using the intake air amount as a parameter while in the range for performing exhaust gas recirculation.
When a running condition of an internal combustion engine 1 is in the range for performing the exhaust gas recirculation(EGR), an electronic control unit(ECU) 100 controls an EGR valve 19 constituting the exhaust gas recirculation means and a centrifugal supercharger of variable nozzle type 7 using the intake air amount as a parameter. That is, the target intake air amount per rotation of a crank shaft is calculated using an engine speed and accelerator opening degree as parameters, and the actual intake air amount and the target intake air amount are compared for controlling. With this control mechanism, when the actual intake air amount is smaller than the target one, for example, a boost pressure from the centrifugal supercharger of variable nozzle type 7 is raised while decreasing the opening degree of the EGR valve 19, thus reducing EGR gas supplied to a combustion chamber of each cylinder 1a to 1d, and increasing the intake air amount.
GOTO ISAMU
ISHIGAKI HIROTATSU
YAMAMOTO TAKASHI
KANEKO TOMOHIRO
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