Exhaust emission control device of internal combustion engine

摘要

An exhaust gas emission control device of an internal combustion engine, comprises: DPF (17) provided in an exhaust passage (11) of the diesel engine (1) ; a throttle valve (25) for regulating the volume of intake air into the diesel engine (1) ; temperature raise control means (30) for performing restriction of intake air or post-injection or exhaust-stroke injection in order to raise the temperature of the DPF (17); and ECU (30) for controlling the throttle valve (25) in accordance with the operating state of the diesel engine (1). The ECU (30) controls the throttle valve (25) in order to retain the temperature of the DPF (17) by restriction of intake air when interrupting temperature raise control during temperature raise of the DPF (17).