Invention Grant
- Patent Title: Method and apparatus for diagnosing engine fault
- Patent Title (中): 用于诊断发动机故障的方法和装置
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Application No.: US14006446Application Date: 2012-02-24
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Publication No.: US09038445B2Publication Date: 2015-05-26
- Inventor: Hiroshi Ito , Takayuki Abe , Tetsuya Ohno , Mahito Shikama
- Applicant: Hiroshi Ito , Takayuki Abe , Tetsuya Ohno , Mahito Shikama
- Applicant Address: JP Tokyo
- Assignee: HONDA MOTOR CO., LTD.
- Current Assignee: HONDA MOTOR CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Squire Patton Boggs (US) LLP
- Priority: JP2011-065104 20110324; JP2011-065105 20110324
- International Application: PCT/JP2012/054513 WO 20120224
- International Announcement: WO2012/127976 WO 20120927
- Main IPC: G01M15/11
- IPC: G01M15/11 ; F02D41/14 ; F02D41/22 ; F02D41/12 ; G01M15/04
Abstract:
According to a method and an apparatus of the present invention for diagnosing a fault of an engine, a cranking rotation state is created by rotating a crank shaft while explosions in each cylinder are stopped; a variation of angular velocity of the crank shaft is detected for each cylinder in the cranking rotation state; a cylinder the compression pressure of which is insufficient is detected based on the variation; and if a cylinder indicated as a misfiring cylinder by a fault code is the same as the cylinder detected as being insufficient in compression pressure in the cranking rotation state, the cylinder is specified.
Public/Granted literature
- US20140007664A1 METHOD AND APPARATUS FOR DIAGNOSING ENGINE FAULT Public/Granted day:2014-01-09
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