Air/fuel ratio control system for internal combustion engine and air/fuel ratio controlling oxygen density sensor
US5025767A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Apr 7, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4065
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed herein is an air/fuel ratio control system for an internal combustion engine. The system includes a first oxygen density sensor element, a second oxygen density sensor element having a slower detection response speed than the first sensor element, an air/fuel ratio control unit for controlling the air/fuel ratio of the engine on the basis of results of a comparison between a detection value from the first sensor element and a standard value, and an air/fuel ratio control correction means for effecting a correction to the air/fuel ratio control by the air/fuel ratio control unit on the basis of results of comparison between a detection value from the second sensor element and a second standard value. An air/fuel ratio controlling oxygen density sensor is also disclosed. The sensor is constructed of a first oxygen density sensor element and a second oxygen density sensor element for detecting the density of oxygen in exhaust gas at a slower detection response speed compared to the first sensor element. The first and second oxygen density sensor elements are both provided on a common base member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.