Activation determining system for oxygen sensor

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(11)

EP 2 530 288 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	29.10.2014 Bulletin 2014/44

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

(21)	Application number: 11185695.1

(22)	Date of filing: 19.10.2011

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International Patent Classification (IPC):

F02D 41/14^(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

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Priority:

31.05.2011 JP 2011122679

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

(72)	Inventors:
	Kihara, Hirotaka Iwata-shi, Shizuoka 438-8501 (JP) Sawada, Yuuichirou Iwata-shi, Shizuoka 438-8501 (JP) Nakamura, Michihisa Iwata-shi, Shizuoka 438-8501 (JP)

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

(54)	Activation determining system for oxygen sensor

(57) In an activation determining system, 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 varies towards the convergence value VP for a predetermined period of time or longer during execution of fuel supply cut-off or when the output value Vd(n) varies towards the convergence value VP by a predetermined amount or greater during execution of the fuel supply cut-off.

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