(19)
(11) EP 2 682 579 A8

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

(15) Correction information:
Corrected version no 1 (W1 A2)

(48) Corrigendum issued on:
25.06.2014 Bulletin 2014/26

(43) Date of publication:
08.01.2014 Bulletin 2014/02

(21) Application number: 13172989.9

(22) Date of filing: 20.06.2013
(51) International Patent Classification (IPC): 
F01N 3/20(2006.01)
 F01N 3/025(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
Designated Extension States:
BA ME

(30) Priority: 02.07.2012 JP 2012148723

(71) Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Toyota-shi, Aichi-ken, 471-8571 (JP)

(72) Inventor:
  • OTA, Hirohiko
    Toyota-shi, Aichi-ken, 471-8571 (JP)

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

   


(54) Exhaust emission control system for internal combustion engine, and control method for exhaust emission control system


(57) An exhaust emission control system for an internal combustion engine (1) includes: an urea aqueous solution addition valve (230) that supplies urea aqueous solution to an exhaust passage (26); and an urea aqueous solution supply tube (240) that supplies urea aqueous solution to the urea aqueous solution addition valve (230). When it is determined that a second exhaust gas temperature (TH2) upstream of a selective reduction NOx purification catalyst (41) is higher than or equal to a reference temperature (YES in step S11), a control device (80) executes recovery control for recovering urea aqueous solution in the urea aqueous solution supply tube (240) (step S14).