Patent ID: 7930879

Claim:
A control device which controls regeneration of an exhaust emission purifier disposed in an exhaust system of the engine, comprising: an air-fuel ratio detecting element that detects an actual air-fuel ratio of a quantity of air supplied to the engine and a quantity of fuel supplied to the engine; a target temperature determining unit that determines a target temperature of the exhaust emission purifier in the regeneration of the exhaust emission purifier from an internal condition of the exhaust emission purifier; a target air-fuel ratio determining unit that determines a target air-fuel ratio from the target temperature determined by the target temperature determining unit; an operating element that supplies the air or the fuel to the engine; and an air-fuel ratio controller that controls the actual air-fuel ratio detected by the air-fuel ratio detecting element to the target air-fuel ratio according to a feedback control, by controlling the operating element according to the actual air-fuel ratio and the target air-fuel ratio in the regeneration of the exhaust emission purifier, to control a temperature of the exhaust emission purifier to the target temperature.