Air/fuel ratio control system for internal combustion engine
US4912926A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 1988 |
| Grant date | Apr 3, 1990 |
| Priority date | — |
| Expiry date | May 4, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1479
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air/fuel ratio control system is provided for an internal combustion engine. The system includes first and second oxygen density sensors, an air/fuel ratio control device and a standard-value changing device. The first oxygen density sensor is arranged on an upstream side of a catalytic converter, while the second oxygen density sensor is provided either inside or on a downstream side of the catalytic converter. The air/fuel control device controls the air/fuel ratio of the internal combustion engine on the basis of results of comparison between a detection value from one of the first and second oxygen density sensors and a predetermined standard value. The standard-value changing device changes the standard value on the basis of outputs from the first and second oxygen density sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.