Learning method of injection characteristic and fuel injection controller
US7451037B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 2007 |
| Grant date | Nov 11, 2008 |
| Priority date | — |
| Expiry date | Jun 25, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M63/0225
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A learning time counter is started and updated if an operation state is stabilized after shifting to a certain operation range. Then, convergence of a FCCB correction value of a variation in an injection characteristic is determined. If the FCCB correction value is determined to have converged, a permit flag is turned on and the FCCB correction value is decided as a learning value. Even if the FCCB correction value does not converge, the learning value is compulsorily decided when the learning time counter reaches a threshold. If the FCCB correction value is decided early, a surplus time is added to a threshold of the next operation range. Thus, the variation of the injection characteristics among cylinders can be learned highly accurately while averting unnecessary lengthening of a learning time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.