To provide a control device of an internal combustion engine which is applied to an internal combustion engine having a catalyst to perform air-fuel ratio control and exhaust gas temperature control.
This control device includes: an air-fuel ratio control means for changing the quantity of fuel to be supplied to the engine according to a first change quantity determined so that the air-fuel ratio of an air-fuel mixture coincides with the target air-fuel ratio; and an exhaust gas temperature control means for changing the quantity of fuel to be supplied to the internal combustion engine according to a second change quantity determined so as to lower the temperature of exhaust gas. The control device determines the first change quantity and a second change quantity in a fourth point of time so that the sum of the first change quantity and the second change quantity in the fourth point of point of time in a catalyst temperature control period is equal to or larger than the first change quantity in a first point of time, when the air-fuel ratio is controlled in the first point of time and at least the exhaust gas temperature control out of the air-fuel ratio control and the exhaust gas temperature control is performed in the catalyst temperature control period which is a period up to a third point of time after a second point of time, from the first point of time or the second point of time after the first point of time.
KONDO SHINYA
TAKAMA YASUYUKI
| JP2011069339A | 2011-04-07 |
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