Cylinder-by-cylinder air-fuel ratio controller for internal combustion engine
US7195008B2 · kind B2 · utility
11Cited by
3References
9Claims
0Family size
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Key dates
| Filing date | Apr 25, 2006 |
| Grant date | Mar 27, 2007 |
| Priority date | — |
| Expiry date | Apr 25, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/2474
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
During a learning mode period, the fuel correction coefficient is forcibly changed three times from a situation in which no correction is necessary, whereby the fuel injection quantity of each cylinder is forcibly changed three times. A cross-correlation between the estimated air-fuel ratio and the fuel correction coefficient, which are calculated based on the detected value of the air-fuel ratio sensor every 60° CA, is evaluated to learn a deviation of the air-fuel ratio detecting timing from the appropriate value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.