Method for detecting misfires in an internal combustion engine
US5144927A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 1991 |
| Grant date | Sep 8, 1992 |
| Priority date | — |
| Expiry date | Sep 4, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M15/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention is directed to a method for detecting misfires in an internal combustion engine having Z cylinders. A compression angular segment and an expansion angular segment are fixed for each cylinder (i) of the Z cylinders in accordance with an initial crankshaft angle and a crankshaft angle span corresponding to this cylinder so that, with a smooth running of the engine and referred to time, a compression time span TV(i) corresponding to said compression angular segment is essentially equal to an expansion time span TE(i) corresponding to said expansion angular segment, with the compression angular segment lying within that crankshaft angle span for the cylinder (i) in which the engine speed drops because of compression occurrences and with the expansion angular segment lying within that crankshaft angle span for the cylinder (i) in which the engine speed increases because of expansion occurrences; and, deviations between compression time span and expansion time span for at least one cylinder are used to detect misfires.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.