Device for purifying the exhaust gases of diesel engines

Details Device for purifying the exhaust gases of diesel engines Device for purifying the exhaust gases of diesel engines

2008-01-08

2008-01-08

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S295000, C060S311000, C060S324000

Reexamination Certificate

active

11091409

ABSTRACT:
In a diesel engine provided with a diesel particulate filter81and an exhaust throttle valve9, noise is decreased that is produced when the exhaust throttle valve is returned back to the fully opened state after a diesel particulate filter81has been regenerated by oxidizing and removing the particulate matter deposited thereon. The exhaust system of the diesel engine is equipped with the diesel particulate filter81and a catalyst82on the upstream thereof, and is further equipped with the exhaust throttle valve9on the downstream. The diesel particulate filter81is regenerated by operating the diesel engine in a state where the exhaust throttle valve9is opened to a small degree. When the regeneration has finished, the diesel engine is run at a decreased rotational speed and, thereafter, the exhaust throttle valve9is returned back to the fully opened state. When the engine is run at a decreased rotational speed, the pressure in the exhaust system decreases making it possible to greatly decrease the noise that generates at the time of the opening of the exhaust throttle valve9.

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