发明申请
- 专利标题: Diagnostic apparatus for variable valve control system
- 专利标题(中): 可变气门控制系统诊断装置
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申请号: US11050828申请日: 2005-01-27
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公开(公告)号: US20050204805A1公开(公告)日: 2005-09-22
- 发明人: Keiji Wakahara , Hirofumi Shoda
- 申请人: Keiji Wakahara , Hirofumi Shoda
- 申请人地址: JP Kariya-city
- 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
- 优先权: JP2004-21710 20040129; JP2004-60343 20040304
- 主分类号: F01L1/34
- IPC分类号: F01L1/34 ; F01L13/00 ; F02D13/02 ; F02D41/00 ; F02D41/22 ; F02D41/34 ; G01M15/09 ; G01M99/00 ; G01M19/00
摘要:
ECU calculates variations of air-fuel ratios of respective cylinders and variations of air-fuel ratios of all the cylinders in variable intake valve lift devices of two cylinder groups. Presence and absence of an abnormality is determined on the basis of whether ratios of variations of air-fuel ratios of respective cylinders to variations of air-fuel ratios of all the cylinders are less than an abnormality threshold. Whether which of variable intake valve lift devices of the cylinder groups is abnormal is determined from control modes of the variable intake valve lift devices of the respective cylinder groups, and the relationship between that cylinder group, to which a cylinder being maximum in air-fuel ratio belongs, and cylinder group, to which a cylinder being minimum in air-fuel ratio belongs.
公开/授权文献
- US07146851B2 Diagnostic apparatus for variable valve control system 公开/授权日:2006-12-12
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