(19)
(11) EP 3 168 448 A8

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

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
16.08.2017 Bulletin 2017/33

(43) Date of publication:
17.05.2017 Bulletin 2017/20

(21) Application number: 16162790.6

(22) Date of filing: 30.03.2016
(51) International Patent Classification (IPC): 
F02D 41/14(2006.01)
F01N 11/00(2006.01)
F02D 41/02(2006.01)
 F01N 3/00(2006.01)
F01N 13/00(2010.01)
F02D 41/22(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
Designated Validation States:
MA MD

(30) Priority: 31.03.2015 JP 2015074273

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

(72) Inventors:
  • OKAZAKI, Shuntaro
    Aichi-ken, 471-8571 (JP)
  • SUZUKI, Kenji
    Aichi-ken, 471-8571 (JP)
  • MIYAMOTO, Hiroshi
    Aichi-ken, 471-8571 (JP)
  • MIYOSHI, Yuji
    Aichi-ken, 471-8571 (JP)

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

   


(54) EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE


(57) An exhaust purification system comprises an exhaust purification catalyst 20, a downstream side air-fuel ratio sensor 41 and a control device. The control device makes the air-fuel ratio of the exhaust gas change to an air-fuel ratio at a rich side from the prior air-fuel ratio as air-fuel ratio rich increasing control when the air-fuel ratio of the exhaust gas is made a rich air-fuel ratio and the output air-fuel ratio of the downstream side air-fuel ratio sensor is maintained at a lean judged air-fuel ratio or more, and judges that the downstream side air-fuel ratio sensor suffers from an abnormality, when, due to the air-fuel ratio rich increasing control, the air-fuel ratio of the exhaust gas is made to change to the rich side air-fuel ratio and the output air-fuel ratio of the downstream side air-fuel ratio sensor changes to the lean side.