Misfire detection device for an internal combustion engine
US5191788A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 27, 1991 |
| Grant date | Mar 9, 1993 |
| Priority date | — |
| Expiry date | Nov 27, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M15/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A misfire detection device for an internal combustion engine determines the time length tx from each ignition timing, as determined by the ignition signal Se, to a predetermined angle of the crank shaft after the ignition timing as determined by the crank angle pulse signal Sd. When the difference between the current and the preceding time lengths thus determined exceeds a reference level, an occurrence of misfire is detected. Alternatively, when the difference .DELTA..omega.d between the instantaneous angular velocities immediately after the ignition timing and a predetermined angle thereafter as determined on the basis of the crank angle pulse signal Sd is less than a predetermined reference level, an occurrence of misfire is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.