Method and apparatus for detecting combustion variations in internal combustion engine
US4691286A · kind A · utility
21Cited by
5References
8Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jun 26, 1985 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Jun 26, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/1015
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an internal combustion engine, a plurality of engine rotational speeds are detected at predetermined timings for every firing stroke in one cylinder of the engine, and an engine speed variation is calculated as a variation between the square of one of the engine rotational speed and the square of another of the engine rotational speed. A process is performed upon the sequence of the engine speed variations, thus determining an engine combustion state by the processed result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.