Ignition timing control system for internal combustion engines
US5887570A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1997 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Aug 26, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
There is provided an ignition timing control system for an internal combustion engine. An air-fuel ratio sensor is arranged in the exhaust system, for detecting the air-fuel ratio of exhaust gases emitted from a plurality of cylinders of the engine. The air-fuel ratio of a mixture supplied to each of the cylinders is estimated based on an output from the air-fuel ratio sensor, by using an observer for observing an internal operative state of the exhaust system based on a model representative of a behavior of the exhaust system. The ignition timing of the each cylinder of the engine is controlled based on the estimated air-fuel ratio of the mixture supplied to the each cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.