发明申请
- 专利标题： Cylinder abnormality diagnosis unit of internal combustion engine and controller of internal combustion engine
- 专利标题（中）： 内燃机缸内异常诊断单元和内燃机控制器
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申请号： US11984020申请日： 2007-11-13
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公开(公告)号： US20080114526A1公开(公告)日： 2008-05-15
- 发明人: Masaei Nozawa , Yoshihiro Okuda , Masanori Kurosawa
- 申请人： Masaei Nozawa , Yoshihiro Okuda , Masanori Kurosawa
- 申请人地址： JP Kariya-city 448-8661
- 专利权人： DENSO CORPORATION
- 当前专利权人： DENSO CORPORATION
- 当前专利权人地址： JP Kariya-city 448-8661
- 优先权： JP2006-309071 20061115; JP2006-316506 20061124; JP2006-331382 20061208
- 主分类号： F02D41/30
- IPC分类号： F02D41/30
摘要：
It is determined whether an engine operating state is within a specified operating range. When the engine operating state is within the specified operating range, the air-fuel ratio of an i-th cylinder is estimated based on the detection value of the air-fuel ratio sensor, and a cylinder deviation, which is the deviation of an estimated air-fuel ratio from a reference air-fuel ratio, is computed. When this cylinder deviation becomes larger than a specified determination value, the processing of incrementing the count value of an abnormality counter is started at a point in time when a specified delay time elapses after the cylinder deviation becomes larger than the specified determination value. At a point in time when the count value of the abnormality counter becomes larger than a specified abnormality determination value, it is determined that the air-fuel ratio of the i-th cylinder is abnormal.
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