Method for detecting combustion failure by filtering
US7072760B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 2004 |
| Grant date | Jul 4, 2006 |
| Priority date | — |
| Expiry date | Feb 11, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/1015
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for detecting combustion failure in an internal combustion engine, by calculating an index ln(t) representing engine irregularities at a moment (t) during certain combustion phases in one cylinder; calculating an observation function G(t), which is a function between index ln(t) and an estimated reference value In+/−i(t) at a different moment during engine operation comparing G(t) to a threshold (S), which is a function of engine load (C) and/or rpm (N); and diagnosing a combustion failure when G(t) exceeds (S) or: G(t)=In(t)−ln(t), wherein In(t) is a function of ln(t) and In+/−i(t) represents the index ln(t) after weighting of the values of said index outside an acceptable predefined differential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.