Title:
Internal combustion engine
Document Type and Number:
Japanese Patent JP6288011
Kind Code:
B2
Abstract:
The internal combustion engine comprises an exhaust purification catalyst 20, a downstream side sensor 41, an air-fuel ratio control unit, and an oxygen storage amount calculating unit for calculating the oxygen excess/deficiency of the inflowing exhaust gas in an air-fuel ratio maintenance time period and cumulatively adding the calculated oxygen excess/deficiency to calculate a maximum oxygen storage amount of the exhaust purification catalyst. The oxygen storage amount calculating unit uses a point of time that an absolute value of an output slope of the downstream side sensor finally becomes less than a threshold value in the air-fuel ratio maintenance time period as an end point of cumulative addition of the oxygen excess/deficiency. The threshold value is made larger when a maximum value of the absolute value of the output slope in the air-fuel ratio maintenance time period is relatively large compared to when the maximum value is relatively small.
Inventors:
Hiroshi Miyamoto
Tatsuhiro Hashida
Takahiko Fujiwara
Yasushi Iwasaki
Toru Kisho
Tatsuhiro Hashida
Takahiko Fujiwara
Yasushi Iwasaki
Toru Kisho
Application Number:
JP2015170917A
Publication Date:
March 07, 2018
Filing Date:
August 31, 2015
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
B01D53/94; F01N3/24; F01N3/18; F02D41/04; F02D45/00
Domestic Patent References:
| JP201586861A | ||||
| JP2015101992A | ||||
| JP2010185371A | ||||
| JP2010255490A |
Attorney, Agent or Firm:
Atsushi Aoki
Jun Tsuruta
Yuichi Morimoto
Shinji Mitsuhashi
Koichi Ito
Tatsuki Sone
Jun Tsuruta
Yuichi Morimoto
Shinji Mitsuhashi
Koichi Ito
Tatsuki Sone
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