Patent ID: 8256207

Claim:
An exhaust emission control device which controls fuel injected into an internal combustion engine to remove particulate matters deposited in a particulate filter arranged in an exhaust pipe connected to the engine, comprising: a catalyst judging block configured to judge whether a catalyst held in the particulate filter is in an active state or in an inactive state; a determining block configured to determine which of a first fuel injection type and a second fuel injection type should be used to inject the fuel into the internal combustion engine, when the catalyst judging block determines that the catalyst held in the particulate filter is in the active state, the first fuel injection type injecting the fuel to the internal combustion engine to heighten a temperature of the exhaust gas, the second fuel injection type injecting the fuel to the engine to supply an unburned hydrocarbon to the particulate filter; and a control unit configured to control the fuel injected into the engine based on a determined result by the determining block; wherein: the control unit includes an exhaust gas detecting block configured to detect a flow rate of exhaust gas which is currently outputted from the engine and passes through the particulate filter, and the determining block determines which of the first fuel injection type and the second fuel injection type should be used to inject the fuel into the engine, according to the currently detected flow rate of the exhaust gas.