| 摘要 |
PROBLEM TO BE SOLVED: To prevent interference between an EGR feedback control and supercharging pressure feedback control, when both the EGR feedback control and supercharging pressure feedback control are employed. SOLUTION: Feedback control is applied to the opening of an EGR valve 24, so that actual air quantity detected with an air flowmeter 14 becomes the target air quantity. The feedback control is applied to the fluctuating position of a nozzle used for adjusting the exhaust gas inflow direction and provided in an exhaust turbo supercharger 15, so that actual supercharging pressure detected with an intake pressure sensor 17 becomes the target supercharging pressure. Establishment are employed, in such a way that the EGR feedback control is executed at the engine low-load region only, and the supercharging pressure feedback control is executed at the engine high-load region only. Their operating conditions are established so that both the feedback controls are not executed simultaneously. |
