Method for sensing faulty combustion in an internal combustion engine
US5708200A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1996 |
| Grant date | Jan 13, 1998 |
| Priority date | — |
| Expiry date | Oct 15, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/1015
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for sensing faulty combustion in an internal combustion engine by calculating, for each cylinder, a critical parameter (S) representing instantaneous engine speed changes on the basis of a linear combination of time intervals between predetermined angular positions of a target secured to the crankshaft, determining whether the engine is in a combustion-free operating range and in at least one rpm range centered on a predetermined rpm value, calculating, if such is the case, a critical parameter correction coefficient (Kg(n); Kg(n+1)) relative to a reference engine on the basis of the current value of the critical parameter (S) and a reference value (S.sub.ref) obtained under substantially identical conditions in said reference engine, and comparing the later values of the critical parameter, as corrected by the correction coefficient (Kg(n); Kg(n+1)), with a fault threshold (S.sub.threshold) obtained experimentally in the reference engine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.