Title:
【発明の名称】エンジンの失火判定装置
Document Type and Number:
Japanese Patent JP2784069
Kind Code:
B2
Abstract:
The device for monitoring the combustion state of each cylinder is provided in a multi-cylinder engine and determining if combustion abnormality occurs in the cylinder. The misfiring determining circuit compares an engine speed of a previous interval with that of a current interval, calculates the speed variation of a cylinder between both intervals, and determines the misfiring level by comparing the variation with the misfiring determining level. A cylinder misfiring time counting circuit counts the misfiring time of each cylinder and informs a cylinder misfiring time calculating circuit of the counting result. The cylinder misfiring time calculating circuit serves to average the misfiring time. A cylinder abnormal misfiring determining circuit compares the average misfiring time with a predetermined misfiring time maximum value for detecting the abnormal misfiring in each cylinder.
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Inventors:
IMAI RYUICHIRO
Application Number:
JP34136389A
Publication Date:
August 06, 1998
Filing Date:
December 28, 1989
Export Citation:
Assignee:
FUJI JUKOGYO KK
International Classes:
F02D45/00; F02D35/02; G01M15/11; (IPC1-7): F02D45/00; F02D45/00
Domestic Patent References:
| JP61258955A |
Attorney, Agent or Firm:
Susumu Ito