发明申请
- 专利标题: Air-fuel ratio control apparatus for internal combustion engine
- 专利标题(中): 用于内燃机的空燃比控制装置
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申请号: US11326334申请日: 2006-01-06
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公开(公告)号: US20070023021A1公开(公告)日: 2007-02-01
- 发明人: Tomohisa Shouda , Keiichi Enoki , Hideaki Tani
- 申请人: Tomohisa Shouda , Keiichi Enoki , Hideaki Tani
- 专利权人: MITSUBISHI DENKI KABUSHIKI KAISHA
- 当前专利权人: MITSUBISHI DENKI KABUSHIKI KAISHA
- 优先权: JPP2005-220326 20050729
- 主分类号: F02D41/14
- IPC分类号: F02D41/14
摘要:
At the time of start-up, fuel supply is made excessive. When air-fuel ratio feedback control is started while the fuel is excessive, the control is put into a state of overshoot or hunting, and it takes a long time to converge to the target air-fuel ratio. In an air-fuel ratio control apparatus, a selection switch is provided at the output of an integration calculation circuit to perform air-fuel ratio feedback control, and immediately after start-up of the engine, an upper/lower limit clip value for use immediately after start-up, which is smaller than a normal one, is selected to perform the air-fuel ratio feedback control. Even if the air-fuel ratio feedback control is started immediately after the start-up in a state where the fuel is excessive, the actual air-fuel ratio does not overshoot with respect to the target air-fuel ratio and is quickly converged to the target air-fuel ratio.