PM CONTINUOUS REGENERATION DEVICE FOR DIESEL ENGINE, AND METHOD OF PRODUCING THE SAME

摘要

In conventional automobile diesel engines, efforts have been made to reduce harmful substances contained in exhaust gases mainly by improving combustion in the engine itself; however, it has been very difficult to satisfy the exhaust restrictions in force on and after 2005. Accordingly, the invention provides a PM oxidation method for oxidizing particulate matter contained in exhaust gases discharged from a diesel engine (10) by passing the exhaust gases through an exhaust cleaning device, the method being characterized by providing an intake throttle (24) in the intake passageway of the diesel engine (10) to increase the temperature of the exhaust gases flowing from the diesel engine (10) into the exhaust cleaning device, and periodically opening the intake throttle (24) to supply fresh gas to the diesel engine (10). According to the invention, it becomes possible to significantly increase the NO and residual oxygen in the exhaust gases flowing into a muDPF (30) or the like and to effectively oxidize the particulate matter during a low load on the diesel engine and also during idling.