Patent ID: 6823661
Filing Date: 2004-11-30
Classification: F01L,F01N,F02D,Y02T

Abstract:
A device for purifying exhaust gas of a diesel engine having an intake air passage and an exhaust gas passage, the exhaust gas passage being equipped with a continuous regeneration type diesel particulate filter system, including a diesel particulate filter and a catalyst upstream of the diesel particulate filter, said device comprising:an intake air shutter arranged in the intake air passage of the engine; an exhaust gas temperature region detecting means for detecting an exhaust gas temperature region of the engine; a control means for squeezing the opening degree of said intake air shutter when the exhaust gas temperature region of the engine, detected by said exhaust gas temperature region detecting means, 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.