(19)
(11) EP 2 851 531 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 2 (W2 A1)

(48) Corrigendum issued on:
30.09.2015 Bulletin 2015/40

(43) Date of publication:
25.03.2015 Bulletin 2015/13

(21) Application number: 14189425.3

(22) Date of filing: 21.09.2011
(51) International Patent Classification (IPC): 
F01N 3/20(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 22.09.2010 JP 2010212866

(62) Application number of the earlier application in accordance with Art. 76 EPC:
11776852.3 / 2619425

(71) Applicants:
  • TOYOTA JIDOSHA KABUSHIKI KAISHA
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Kariya-shi, Aichi-ken 448-8671 (JP)

(72) Inventors:
  • HIROTA, Shinya
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • TOSHIOKA, Shunsuke
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • MIKAMI, Akira
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • FUKUDA, Koichiro
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • HOSHI, Sakutaro
    Kariya-shi, Aichi-ken, 448-8671 (JP)
  • ENDO, Takashi
    Kariya-shi, Aichi-ken, 448-8671 (JP)
  • HIBINO, Ryoichi
    Aichi-gun, Aichi-ken, 480-1192 (JP)
  • UEDA, Matsuei
    Aichi-gun, Aichi-ken, 480-1192 (JP)
  • ASANO, Akihiko
    Aichi-gun, Aichi-ken, 480-1192 (JP)
  • YAMAUCHI, Takafumi
    Aichi-gun, Aichi-ken, 480-1192 (JP)
  • SHICHI, Akira
    Aichi-gun, Aichi-ken, 480-1192 (JP)
  • KOIKE, Makoto
    Aichi-gun, Aichi-ken, 480-1192 (JP)
  • MARUYAMA, Masatoshi
    Kariya-city, Aichi-pref., 448-8661 (JP)
  • SAKATA, Masakazu
    Kariya-city, Aichi-pref., 448-8661 (JP)

(74) Representative: Kuhnen & Wacker 
Patent- und Rechtsanwaltsbüro Prinz-Ludwig-Straße 40A
85354 Freising
85354 Freising (DE)

 
Remarks:
THIS APPLICATION WAS FILED ON 17-10-2014 AS A DIVISIONAL APPLICATION TO THE APPLICATION MENTIONED UNDER INID CODE 62.
 


(54) Exhaust gas control apparatus and control method for exhaust gas control apparatus


(57) An exhaust gas control apparatus includes a control device that controls a urea addition valve for adding urea from an upstream side of a NOx reduction catalyst. The control device obtains an ammonia adsorption amount distribution through the NOx reduction catalyst, and when an ammonia adsorption amount in a predetermined part on an exhaust gas flow direction downstream side equals or exceeds a predetermined threshold, the control device controls the urea addition valve to stop the urea supply or reduce the amount of urea supply. The urea addition valve is controlled basis on an adsorption amount distribution obtained from a model on which the catalyst is divided into a plurality of cells such that an ammonia adsorption amount in a first cell positioned furthest upstream equals or exceeds a predetermined threshold close to a saturation adsorption amount and an ammonia adsorption amount in a second cell positioned downstream of the first cell reaches a predetermined target value that is smaller than the threshold.