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Title:
AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2014/181512
Kind Code:
A1
Abstract:
An air-fuel ratio control device is provided with a constant current circuit that changes the output characteristics of an upstream oxygen sensor (25) by supplying a constant current between sensor electrodes of the upstream oxygen sensor (25). When the output of a downstream oxygen sensor (26) is more on the rich side than a target voltage, the output characteristics of the upstream oxygen sensor (25) are shifted to the lean direction. Thus, the control center for the air-fuel ratio feedback control based on the output of the upstream oxygen sensor (25) is changed in the lean direction and the control region for the air-fuel ratio of the catalyst inlet gas is expanded in the lean direction. When the output of a downstream oxygen sensor (26) is more on the lean side than a target voltage, the output characteristics of the upstream oxygen sensor (25) are shifted to the rich direction. Thus, the control center for the air-fuel ratio feedback control is changed in the rich direction and the control region for the air-fuel ratio of the catalyst inlet gas is expanded in the rich direction.

Inventors:
KUROSAWA, Masanori (C/O DENSO CORPORATION, 1-1 Showa-cho, Kariya-cit, Aichi 61, 〒4488661, JP)
OGURI, Takamasa (C/O DENSO CORPORATION, 1-1 Showa-cho, Kariya-cit, Aichi 61, 〒4488661, JP)
KOIKE, Satoshi (C/O DENSO CORPORATION, 1-1 Showa-cho, Kariya-cit, Aichi 61, 〒4488661, JP)
MATSUOKA, Mikiyasu (C/O DENSO CORPORATION, 1-1 Showa-cho, Kariya-cit, Aichi 61, 〒4488661, JP)
Application Number:
JP2014/002273
Publication Date:
November 13, 2014
Filing Date:
April 23, 2014
Export Citation:
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Assignee:
DENSO CORPORATION (1-1 Showa-cho, Kariya-city Aichi, 61, 〒4488661, JP)
International Classes:
F02D41/14; F01N3/00; F01N3/20; F01N3/24; F02D13/02; F02D21/08; F02D45/00
Foreign References:
JP2010138790A
JPH1019827A
JPH08210164A
JP2009002210A
Attorney, Agent or Firm:
KIN, Junhi (6th Floor, Takisada Bldg. 2-13-19, Nishiki, Naka-ku, Nagoya-cit, Aichi 03, 〒4600003, JP)
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