Patent ID: 8291697

Claim:
An internal combustion engine control device, comprising: a NOx adsorber catalyst disposed in an exhaust passage of an internal combustion engine; an EGR passage configured to draw a portion of exhaust gas from the exhaust passage, downstream of the NOx adsorber catalyst, and to recirculate the exhaust gas into an intake passage of the internal combustion engine; a reducing agent adding device configured to add a reducing agent to the exhaust gas upstream of the NOx adsorber catalyst to reduce substances adsorbed by the NOx adsorber catalyst; a torque fluctuation reducing device; and a fuel injection device configured to inject fuel into a cylinder of the internal combustion engine, wherein, when or after the reducing agent adding device adds the reducing agent, the torque fluctuation reducing device is configured to advance a timing of main fuel injection from the fuel injection device, or to carry out a pilot injection, to reduce fluctuation in torque of the internal combustion engine, and the reducing agent adding device is configured to reduce an amount of reducing agent that is added while the torque fluctuation reducing device is reducing the fluctuation in torque of the internal combustion engine by advancing the timing of main fuel injection from the fuel injection device, or carrying out the pilot injection.