The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 13, 2001
Filed:
Oct. 23, 1998
Koutaro Wakamoto, Hiratsuka, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
The present invention is an apparatus and a method for regenerating an NO,catalyst for a diesel engine, which is capable of regenerating the NO,catalyst having a lower performance due to accumulated SO,. For this purpose, the regeneration apparatus includes an NO,catalyst (,) in an exhaust pipe (,), a reductant fuel adding nozzle (,), a flow rate control valve (,) for controlling a feed rate of reductant fuel supplied to the reductant fuel adding nozzle (,), an inlet temperature sensor (,) of the NO,catalyst (,), and a regeneration control unit (,) for computing the quantity of SO,taken into the NO,catalyst (,) during a period of time in which the inlet temperature is not higher than a predetermined value with a zero feed rate instruction given to the flow control valve (,), and for outputting an instruction for supplying a quantity of the reductant fuel which is larger than a predetermined quantity thereof which is suitable for the operational condition of the diesel engine (,) when the inlet temperature exceeds a predetermined value and the reductant fuel is started to be added.