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    EXHAUST PURIFYING SYSTEM
    1.
    发明公开
    EXHAUST PURIFYING SYSTEM 审中-公开

    公开(公告)号：EP3135875A4

    公开(公告)日：2018-01-24

    申请号：EP15783325

    申请日：2015-04-16

    申请人： ISUZU MOTORS LTD

    发明人： MINEZAWA MASANOBU ,  KAMIJYOU TOMOYUKI ,  SAWADA AKIHIRO

    IPC分类号： F01N3/08 ,  B01D53/94 ,  F01N3/20

    CPC分类号： F01N3/208 ,  B01D53/9409 ,  B01D53/9495 ,  F01N3/08 ,  F01N3/2066 ,  F01N2610/02 ,  F01N2900/0601 ,  F01N2900/16 ,  F01N2900/1602 ,  F01N2900/1622

    摘要： The invention relates to an exhaust purification system that can prevent a NH 3 slip caused by an excessive injection of urea water and includes: an SCR (41) that purifies NOx contained in an exhaust gas using ammonia, as a reducing agent, produced from urea water; a urea water injection device (60) that injects the urea water into an exhaust passage (12) upstream from the SCR (41); an estimated-adsorption-amount calculation unit (51) that calculates an estimated adsorption amount of the ammonia adsorbed in the SCR (41); an injection controll unit (52) that executes an injection control of the urea water injection device (60) based on the estimated adsorption amount; and an estimated-adsorption-amount change unit (53) that changes the estimated adsorption amount used for the injection control into a value increased or decreased by a predetermined amount when a predetermined condition is established that can cause a difference between an actual adsorption amount of the ammonia adsorbed in the SCR (41) and the estimated adsorption amount.

    SELECTIVE CATALYTIC REDUCTION SYSTEM
    3.
    发明公开
    SELECTIVE CATALYTIC REDUCTION SYSTEM 有权
    系统的选择性催化还原

    公开(公告)号：EP2578861A4

    公开(公告)日：2016-09-07

    申请号：EP11786513

    申请日：2011-05-16

    申请人： ISUZU MOTORS LTD

    发明人： ONODERA TAKAO ,  HARA SHINJI ,  KAMIJYOU TOMOYUKI

    IPC分类号： F02D45/00 ,  F01N3/08

    CPC分类号： F01N3/2066 ,  F01N9/00 ,  F01N2560/026 ,  F01N2610/02 ,  F01N2900/0416 ,  F01N2900/1406 ,  F02D41/145 ,  F02D41/146 ,  F02D41/1463 ,  F02D41/1465 ,  Y02T10/24 ,  Y02T10/47

    摘要： An SCR system that can detect a NO x concentration accurately irrespective of an operation state of an engine is provided. The SCR system including: an SCR device 103 provided in an exhaust pipe 102 for an engine E; a dosing valve 104 that injects urea solution on an upstream side of the SCR device 103; a NO x sensor 110 provided in the exhaust pipe 102; and an urea solution injection control unit 127 that controls a urea solution injection quantity according to a NO x concentration value detected by the NO x sensor 110 includes a pressure estimation unit 131 that estimates a NO x sensor pressure that is a pressure inside the exhaust pipe 102 at a position where the NO x sensor 110 is provided, and a NO x concentration detection value correction unit 136 that corrects the NO x concentration value detected by the NO x sensor 110, according to the NO x sensor pressure estimated by the pressure estimation unit 131.