Air/fuel ratio control system for internal combustion engine having compensation means for variation in output characteristic of exhaust sensor
US4163433A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1976 |
| Grant date | Aug 7, 1979 |
| Priority date | — |
| Expiry date | Dec 22, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1456
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a feedback control system for maintaining the air/fuel ratio of a combustible mixture fed to an internal combustion engine at a preset ratio based on the output of an exhaust sensor, a control signal producing circuit having a proportional amplifier and/or an integrator is constructed so as to vary the proportionality constant or the time constant for the integration in dependence on the temperature and flow velocity of the exhaust gas, with a purpose of avoiding an error in the control attributable to a variation in the output characteristic of the exhaust sensor with variations in the condition of the exhaust gas by superficially shifting the aim of the control from the preset ratio to a provisional ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.