Title:
AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2012/098641
Kind Code:
A1
Abstract:
An air-fuel ratio control device for an internal combustion engine according to an embodiment of the present invention determines whether or not a lean request is generated, on the basis of the result of a comparison of: a value (downstream side air-fuel ratio sensor output correlation value) correlated with an output value of a downstream side air-fuel ratio sensor (56) arranged downstream of a catalyst (43); and a predetermined lean request determination value. The air-fuel ratio control device also determines whether or not a rich request is generated, on the basis of the result of a comparison of the downstream side air-fuel ratio sensor output correlation value and a predetermined rich request determination value. Furthermore, the air-fuel ratio control device calculates the total amount of oxygen (oxygen release amount) released from the catalyst during a rich request generation period, and also calculates an integrated value of the amount of oxygen (current oxygen occlusion amount) occluded in the catalyst after the start of a lean request generation period following the rich request generation period. As the current oxygen occlusion amount approaches the oxygen release amount, the rich request determination value is altered in such a way that the point in time at which it is determined that the rich request is generated occurs earlier.
Inventors:
ONOE Ryota (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
尾上 亮太 (〒71 愛知県豊田市トヨタ町１番地 トヨタ自動車株式会社内 Aichi, 〒4718571, JP)
FUJIWARA Takahiko (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
藤原 孝彦 (〒71 愛知県豊田市トヨタ町１番地 トヨタ自動車株式会社内 Aichi, 〒4718571, JP)
尾上 亮太 (〒71 愛知県豊田市トヨタ町１番地 トヨタ自動車株式会社内 Aichi, 〒4718571, JP)
FUJIWARA Takahiko (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
藤原 孝彦 (〒71 愛知県豊田市トヨタ町１番地 トヨタ自動車株式会社内 Aichi, 〒4718571, JP)
Application Number:
JP2011/050727
Publication Date:
July 26, 2012
Filing Date:
January 18, 2011
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA (1 Toyota-cho, Toyota-shi Aichi, 71, 〒4718571, JP)
トヨタ自動車株式会社 (〒71 愛知県豊田市トヨタ町１番地 Aichi, 〒4718571, JP)
ONOE Ryota (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
尾上 亮太 (〒71 愛知県豊田市トヨタ町１番地 トヨタ自動車株式会社内 Aichi, 〒4718571, JP)
FUJIWARA Takahiko (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
トヨタ自動車株式会社 (〒71 愛知県豊田市トヨタ町１番地 Aichi, 〒4718571, JP)
ONOE Ryota (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
尾上 亮太 (〒71 愛知県豊田市トヨタ町１番地 トヨタ自動車株式会社内 Aichi, 〒4718571, JP)
FUJIWARA Takahiko (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
International Classes:
F02D45/00
Attorney, Agent or Firm:
PROSPEC PATENT FIRM (12th Floor, NAGOYA-KS Building 1-18, Taiko 3-chome, Nakamura-ku, Nagoya-sh, Aichi 01, 〒4530801, JP)
Claims:
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