发明申请
- 专利标题: AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
- 专利标题(中): 用于内燃机的空燃比比控制装置
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申请号: US14117440申请日: 2011-05-16
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公开(公告)号: US20140283504A1公开(公告)日: 2014-09-25
- 发明人: Takahiko Fujiwara , Koichi Kimura , Makoto Tomimatsu , Junichi Suzuki
- 申请人: Takahiko Fujiwara , Koichi Kimura , Makoto Tomimatsu , Junichi Suzuki
- 申请人地址: JP Toyota-shi, Aichi-ken
- 专利权人: TOYOTA JIDOSHA KABUSHIKI KAISHA
- 当前专利权人: TOYOTA JIDOSHA KABUSHIKI KAISHA
- 当前专利权人地址: JP Toyota-shi, Aichi-ken
- 国际申请: PCT/JP2011/061176 WO 20110516
- 主分类号: F01N3/10
- IPC分类号: F01N3/10
摘要:
An air-fuel ratio control apparatus for an internal combustion engine according to an embodiment of the invention (the present control apparatus) sets a target air-fuel ratio to a target rich air-fuel ratio when it is determined on the basis of the output value Voxs of a downstream air-fuel ratio sensor 67 that the oxygen adsorption amount of a catalyst 43 tends to be excessive, and sets the target air-fuel ratio to a target lean air-fuel ratio when it is determined on the basis of the output value Voxs that the oxygen adsorption amount of the catalyst 43 tends to be insufficient. Further, the present control apparatus determines whether or not an operation state in which a large amount of nitrogen oxide flows into the catalyst 43 is reached on the basis of “whether a predetermined condition is fulfilled”, and makes the target rich air-fuel ratio obtained when the predetermined condition is fulfilled less than the target rich air-fuel ratio obtained when the predetermined condition is not fulfilled. As a result, the concentration of a reducing agent inside the catalyst 43 can be increased before a large amount of NOx flows into the catalyst 43. Therefore, when a large amount of NOx flows into the catalyst 43, most of the NOx can be eliminated.