Title:
INTERNAL COMBUSTION ENGINE MISFIRE DETECTOR
Document Type and Number:
WIPO Patent Application WO/2019/044426
Kind Code:
A1
Abstract:
An internal combustion engine misfire detector (1) detects misfires in a 4-stroke internal combustion engine and has: a crank angle speed calculation unit (2) which calculates the crank angle speed in accordance with the rotational speed of the engine at each prescribed crank angle; a determination parameter calculation unit (4) which calculates a reference value for the crank angle speed, calculates a relative crank angle speed as the deviation between the reference value and the crank angle speed, and calculates the integrated value of the relative crank angle speed; and a misfire determination unit (5) which determines if a misfire occurred on the basis of the integrated value, wherein the determination parameter calculation unit (4) sets an integration interval for the integrated value in accordance with the RPM of the internal combustion engine.
Inventors:
TASAKI KATSUNORI (JP)
MORITA YUKI (JP)
MORITA YUKI (JP)
Application Number:
PCT/JP2018/029626
Publication Date:
March 07, 2019
Filing Date:
August 07, 2018
Export Citation:
Assignee:
KEIHIN CORP (JP)
International Classes:
F02D45/00
Domestic Patent References:
| WO2011086765A1 | 2011-07-21 |
Foreign References:
| JP2007170262A | 2007-07-05 | |||
| JP2005054630A | 2005-03-03 | |||
| JP2002130009A | 2002-05-09 | |||
| JP2000240500A | 2000-09-05 |
Attorney, Agent or Firm:
KAWAMOTO, Manabu et al. (JP)
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