(19)
(11) EP 2 530 289 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.10.2014 Bulletin 2014/41

(43) Date of publication A2:
05.12.2012 Bulletin 2012/49

(21) Application number: 11188522.4

(22) Date of filing: 10.11.2011
(51) International Patent Classification (IPC): 
F02D 41/14(2006.01)
F02D 41/28(2006.01)
 F02D 41/12(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: 31.05.2011 JP 2011122678

(71) Applicant: Yamaha Hatsudoki Kabushiki Kaisha
Iwata-shi, Shizuoka 438-8501 (JP)

(72) Inventors:
  • Kihara, Hirotaka
    Iwata-shi, Shizuoka 4388501 (JP)
  • Sawada, Yuuichirou
    Iwata-shi, Shizuoka 4388501 (JP)
  • Nakamura, Michihisa
    Iwata-shi, Shizuoka 4388501 (JP)

(74) Representative: Schuster, Thomas 
Grünecker Kinkeldey Stockmair & Schwanhäusser Anwaltssozietät Leopoldstrasse 4
80802 München
80802 München (DE)

   


(54) Activation determining system for oxygen sensor


(57) In the activation determining system for an oxygen sensor, a signal processing circuit is configured to output a signal converging to a predetermined convergence value VP when the oxygen sensor is maintained in the deactivated state. A deactivation determining section is configured to determine that the oxygen sensor is in the deactivated state when an output value Vd(n) from the signal processing circuit falls in a predetermined deactivation range Rna including the convergence value VP. The deactivation determining section is configured to determine that the oxygen sensor is in an activated state when the output value Vd(n) falls in a predetermined first activation range Ra1 different from the deactivation range Rna. The deactivation determining section is configured to determine that the oxygen sensor is in the deactivated state when the output value Vd (n) varies towards the convergence value VP and exceeds a predetermined threshold Vth including in the first activation range Ra1 during execution of fuel supply cut-off.







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Search report