Method and arrangement for adjusting air/fuel ratio of an i. c. engine
US5226920A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 1992 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Sep 10, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/2451
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
For adjusting the air/fuel ratio (A/F) of an i. c. engine having an electrically adjustable carburetor, an electronic detector and control unit is used to which current is supplied by an ignition magnet or generator and which comprises a tachometer, data processing means, an electronic memory, and a control unit for adjusting said ratio. The first derivative of the speed of revolution of the engine is used as a parameter for the adjustment. According to the invention, the adjustment is made after a period of time during which the speed of the engine has been generally constant. Generally constant speed is detected by calculating the average value of said derivative, such that the speed of revolution of the engine is considered to be generally constant when said average value is approximately zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.