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Patent Searching and Data


Title:
EXHAUST DENITRATION DEVICE FOR DIESEL ENGINE
Document Type and Number:
Japanese Patent JP3391587
Kind Code:
B2
Abstract:

PURPOSE: To vary the component of reducer fuel hydrocarbon which acts on a NOx catalyst layer according to engine operating condition, and enlarge the engine operating range in which a catalyst is activated.
CONSTITUTION: Reducer fuel addition nozzles 5, 6 are arranged in the vicinity of the turbine 3 inlet of a turbo supercharger which is mounted in an exhaust pipe 2 and just before inlet of a catalyst layer 4, and a reducer fuel transportation pipe 8 is connected to the nozzles 5, 6 through a reducer fuel supplying device 9 and a reducer fuel addition nozzle control valve 10. A command signal is outputted to the reducer fuel supplying device 9 and the nozzle control valve 10 by a controller 12 on the basis of the output signal of a temperature sensor 11 which is set on the catalyst layer 4. When a catalyst layer temperature attains a prescribed value, reducer fuel is injected from the reducer fuel addition nozzle 5, and when the catalyst layer temperature is a prescribed value and less, reducer fuel is injected from the reducer fuel addition nozzle 6. A reducer fuel supplying device is stopped in the case of a catalyst operation lowest temperature.


Inventors:
Wakamoto, Kotaro
Application Number:
JP1994000308348
Publication Date:
March 31, 2003
Filing Date:
November 18, 1994
Export Citation:
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Assignee:
KOMATSU LTD
International Classes:
F01N3/08; B01D53/94; F01N3/20; F01N3/24; F02B3/06; (IPC1-7): F01N3/24; F01N3/08