Method for ignition timing control in combustion engines
US5676113A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1996 |
| Grant date | Oct 14, 1997 |
| Priority date | — |
| Expiry date | Apr 11, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An improved method applied in combustion engines which use the ionization current in the combustion chamber in order to extract a parameter representative of the pressure in the cylinder, which parameter is used for controlling the ignition timing within an extended range for the load- and speed range. The method is based on an integration of a parameter dependent on the ionization current. In a first embodiment, the mass center position of the integral is calculated, which mass center position is used as a position corresponding to the peak pressure position. The ignition timing is adjusted in such a manner that the mass center position, and hence the peak pressure position, strives to obtain a predetermined target value. In a second embodiment, an integrated value is calculated, which take into account the mechanics of the combustion engine, in such a way that the integrated value corresponds to a value representative of the torque transmitted to the crankshaft. By optimizing the integrated value, the torque transmitted to the crankshaft can be optimized as well, obtaining an optimal usage of the fuel-air mixture supplied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.