Dual sensor misfire detection apparatus and method for an internal combustion engine
US5561600A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1995 |
| Grant date | Oct 1, 1996 |
| Priority date | — |
| Expiry date | Aug 3, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M15/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A misfire detection apparatus and method is provided for detecting misfire in cylinders of an internal combustion engine in a motor vehicle. The method includes sensing rotation of a crankshaft and calculating a crankshaft velocity based on the sensed rotation of the crankshaft. The method also includes repeating the sensing and calculating steps a predetermined number of times to develop a measured crankshaft velocity profile. The method further includes obtaining a stored misfire velocity profile based on speed of the crankshaft, comparing the measured crankshaft velocity profile to the stored misfire crankshaft velocity profile to determine if a match exists, and counting a misfire if a match exits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.