Engine control system including means for learning characteristics of individual fuel injectors
US7721711B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2007 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Nov 9, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/2458
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An engine control system includes an fuel injector for each cylinder of the engine, an air-fuel ratio sensor disposed in an exhaust manifold and an electronic control unit to which signals from various sensors are fed. Operation of the engine is controlled by the electronic control unit. An air-fuel ratio deviation among cylinders is calculated based on output signals of the air-fuel ratio sensor, and injection amount errors of each injector are calculated from the deviation of air-fuel ratio among cylinders. An injection characteristic of each injector is learned from the injection amount errors, and a right amount of fuel is supplied to each cylinder based on the learned injection characteristic. In this manner, the injection amount errors are effectively adjusted, and the air-fuel ratio deviation among cylinders due to external disturbances is surely adjusted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.