Air-fuel ratio adaptive controlling apparatus for use in an internal combustion engine
US4905653A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1989 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Jan 12, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/2451
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel adhesion percentage of an injected fuel to a surrounding portion of an intake valve is determined in accordance with a fluctuation value of an air-fuel ratio correction coefficient and a fluctuation value of a signal of an air-fuel ratio detecting sensor or a signal of an oxygen amount detecting sensor. Each adhesion percentage of the injected fuel is divided and stored in each division area of a characteristic memory map of a control unit. The adhesion percentage of the injected fuel is stored in a memory of the control unit and is determined in accordance with present throttle valve opening degree and present engine coolant temperature by the characteristic memory map. The adhesion percentage of the injected fuel is obtained through a learning control process in the control unit. An air-fuel ratio correction in a transient period is carried out smoothly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.