Patent ID: 6851256

Claim:
An exhaust emission control device comprising: operating condition detecting means for detecting an operating condition of an engine; fuel control means for controlling fuel supply into a combustion chamber of the engine on the basis of an output of the operating condition detecting means; a turbo charger having a turbine, the turbo charger supercharging a suction air in accordance with an exhaust gas of the engine; a filter for capturing particulates in the exhaust gas, the filter holding alkaline metal catalyst and disposed in an exhaust gas passage on the downstream side of the turbine of the turbo charger; exhaust gas temperature sensing means for sensing the exhaust gas temperature near the filter; supercharging pressure control means for controlling a supercharging pressure of the turbo charger to be increased when the exhaust gas temperature sensed by the exhaust gas temperature sensing means exceeds a predetermined temperature; and injection timing control means for controlling the fuel injection timing of the fuel control means to be retarded when the supercharging pressure control means controls the supercharging pressure of the turbo charger to be increased.