Title:
EXHAUST EMISSION CONTROL SYSTEM AND CONTROL METHOD FOR EXHAUST EMISSION CONTROL SYSTEM
Document Type and Number:
Japanese Patent JP2021050703
Kind Code:
A
Abstract:
To provide an exhaust emission control system capable of suppressing deterioration of NOx elimination efficiency by shortening time required for reducing ammonia occlusion amount of an SCR catalyst before filter regeneration.SOLUTION: An exhaust emission control system includes: an SCR catalyst; an urea water injection device provided upstream of the SCR catalyst; an NOx occlusion catalyst (LNT) provided upstream of the SCR catalyst and capable of occluding NOx; an ammonia occlusion amount obtaining section 111 obtaining ammonia occlusion amount in the SCR catalyst; and an NOx slip control section 112 slipping NOx from the NOx occlusion catalyst (LNT) and supplying the NOx to the SCR catalyst on the basis of a relation between an exhaust emission control cycle and ammonia occlusion amount in the SCR catalyst when lowering of the amount of ammonia occluded by the SCR catalyst is required.SELECTED DRAWING: Figure 2
Inventors:
NAGAOKA TAIJI
Application Number:
JP2019175416A
Publication Date:
April 01, 2021
Filing Date:
September 26, 2019
Export Citation:
Assignee:
ISUZU MOTORS LTD
International Classes:
F01N3/08; B01D53/94; F02D41/02; F02D45/00
Attorney, Agent or Firm:
Washeda International Patent Office