Method and circuit for controlling the air-fuel ratio of an internal combustion engine
US4905650A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1988 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Jun 13, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1483
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a method for controlling the air-fuel ratio of an internal combustion engine in which the output voltage of an oxygen measurement probe which is arranged in the exhaust gas duct of the internal combustion engine is fed to a controller and the controller gives off a correcting variable for the air-fuel ratio, signals corresponding to the load and the speed of rotation of the internal combustion engine are furthermore fed to the controller. After each jump in the output voltage of the oxygen measurement probe there take place a first jump followed by, in each case, successive further jumps in the correcting variable. The direction of the jumps depends on the direction of the jump of the output voltage of the oxygen measurement probe while the amplitude of the further jumps is dependent on the load and the speed of rotation. Between the jumps, the correcting variable has a course which is substantially linear with time, the slope being predetermined and the direction corresponding to the direction of the jumps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.