A control device for an internal combustion engine, equipped with: an exhaust purification catalyst (20) capable of storing oxygen; a downstream-side air-fuel ratio sensor (41) arranged downstream in the direction of flow of exhaust from the exhaust purifi...

Provided is a control device for an engine which is capable of purifying NOx with high efficiency at a restart after an idle stop without deteriorating purification efficiency of HC and CO. At the restart after the idle stop, an air-fuel ratio is controlle...

An apparatus (41) for detecting deterioration of a catalyst (21) in an internal combustion engine (10) initially biases an air/fuel ratio of an air-fuel mixture supplied to the internal combustion engine (10) to a rich amount so that an amount of oxygen st...

In an exhaust system of an internal combustion engine, an air-fuel ratio sensor (11) is located upstream of a three-way catalyst (13). An oxygen sensor (12) is located downstream of the catalyst (13). An ECU (30) performs feedback control of the amount of ...

An oxygen storage amount of a catalyst (3) is estimated by a controller (6) in accordance with a sensed air-fuel ratio of an inflowing exhaust gas mixture flowing into the catalyst (3), and a sensed intake air amount of the engine (1), to control the air-f...

The invention relates to a method for operating a three-way catalytic converter that contains an oxygen storage component having a minimum and a maximum fill level for oxygen, and which is arranged in the exhaust tract of an internal combustion engine, whe...

A controller controls an air-fuel ratio of an engine to maintain the oxygen storage amount of a catalyst provided in an exhaust passage at a predetermined amount. At this time, the controller first estimates the initial value of the oxygen storage amount b...

A catalyst 3 which has oxygen storage performance is installed in an engine exhaust passage 2, an oxygen storage amount is estimated based on the output of an upstream air-fuel ratio sensor 4 installed in the upstream of the catalyst 3, and an air-fuel rat...

A catalytic converter. (3) having a three-way catalyst which stores oxygen is disposed in the exhaust passage (2) of an engine (1). An oxygen storage amount of the catalyst is estimated based on the output of a universal exhaust gas oxygen sensor (4) provi...