System for feedback-controlling the air-fuel ratio of an air-fuel mixture to be supplied to an internal combustion engine
US5056308A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1990 |
| Grant date | Oct 15, 1991 |
| Priority date | — |
| Expiry date | Jan 25, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/1432
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A feedback control system for an air-fuel ratio according to the present invention comprises a first oxygen sensor for detecting the oxygen concentration of exhaust gas flowing through a first exhaust pipe of an internal combustion engine, a second oxygen sensor for detecting the oxygen concentration of the exhaust gas passed through an exhaust gas disposer in a common exhaust passage which is connected with both first and second exhaust pipes of the engine, and an electronic control unit for calculating the amount of fuel supply to each cylinder of the engine in accordance with the oxygen concentration of the exhaust gas detected by means of the first oxygen sensor. The electronic control unit contains therein a correction circuit for correcting the amount of fuel supply to that cylinder of the engine which is associated with the second exhaust pipe, in accordance with the oxygen concentration of the exhaust gas detected by means of the second oxygen sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.