| 摘要 |
An engine control device (3) for controlling an exhaust gas recirculation operation includes a variable-capacity turbo supercharger (9, 10), an EGR valve (7), a supercharging pressure controller (15), an EGR controller (14), and an EGR correction amount calculator (16). The variable-capacity turbo supercharger (9, 10) has an adjustable nozzle for varying an entrance area of an exhaust turbine (9) and is operable to change a supercharging pressure in accordance with the opening degree of the adjustable nozzle. The EGR valve (7) adjusts an exhaust reflow amount of exhaust gas flowing from an exhaust passage (5) to an air intake passage (4). The supercharging pressure controller (15) drives the adjustable nozzle to control the supercharging pressure. The EGR controller (14) drives the EGR valve (7) to control the exhaust gas recirculation operation. The EGR correction amount calculator (16) calculates an EGR correction amount that defines an effect of the opening degree variation of the adjustable nozzle on the exhaust gas recirculation operation. The EGR controller (14) performs a feedback control operation on the EGR valve (7) in accordance with a deviation between an EGR control amount corrected by the EGR correction amount and a target EGR control amount. |
