A device for purifying exhaust gas of a diesel engine equipped with a
continuous regeneration type diesel particulate filter arranged in the
exhaust gas passage of the engine. The device includes an intake air
shutter arranged in the intake air passage of the engine, an exhaust gas
temperature region detector for detecting an exhaust gas temperature
region of the engine, a controller for controlling the opening degree of
the intake air shutter when the exhaust gas temperature region of the
engine, detected by the exhaust gas temperature region detector, is lower
than a predetermined temperature region, and an exhaust valve-operating
mechanism equipped with an exhaust gas introduction mechanism for opening
the exhaust valve of the engine for a short period of time during the
intake stroke of a cylinder of the diesel engine, to introduce exhaust gas
into the cylinder.
