CONTROL DEVICE AND CONTROL METHOD OF INTERNAL COMBUSTION ENGINE

摘要

According to the present invention, when the operating state in a non-supercharged area switches from a high load to a low load and an external EGR is stopped, the valve overlap of an exhaust valve with an intake valve is controlled so as to momentarily diminish at a timing (T01) when an EGR control valve (21) is closed, using the valve overlap amount of the exhaust valve with the intake valve as a low-load transitional provisional value. The target value of the valve overlap amount of the exhaust valve with the intake valve is varied from the low-load transitional provisional value to a target value for low loads at a timing (T21), which precedes a timing (T31) by the response time (Deltat) of a variable valve mechanism (28), the timing (T31) being the timing at which the external EGR rate in the cylinder changes due to the varying of the opening degree of the EGR control valve (21).