Method for controlling air-fuel ratio in internal combustion engine
US4633840A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 10, 1985 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Jan 10, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1483
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Air-fuel ratio control of an internal combustion engine is performed using sensors for detecting operating conditions of the engine, such as the intake air amount, engine rotational speed, or air-fuel ratio; a fuel injection valve driven by an electrical signal to inject fuel; and a control circuit for receiving signals from the operating condition sensors, performing predetermined operations and generating an electrical signal for driving the fuel injection valve. The control circuit performs a step of calculating an air-fuel ratio variation D(A/F) with respect to an optimum air-fuel ratio based on the ratio of a change .DELTA.F, of an air-fuel ratio correction signal F during acceleration under air-fuel ratio feedback control based on a signal from the air-fuel ratio sensor, to an acceleration amount A, and a step of controlling a transient fuel correction ratio f(AEW) based on the obtained air-fuel ratio variation D(A/F).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.