Oxygen sensor monitoring
US5305727A · kind A · utility
3Cited by
9References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1992 |
| Grant date | Apr 26, 1994 |
| Priority date | — |
| Expiry date | Jun 1, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1495
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An on-board oxygen sensor monitoring system includes measuring a first limit cycle of air/fuel controller operation, changing operating parameters of the air/fuel controller and measuring a second limit cycle with the new calibration of the controller. A time constant of the oxygen sensor is calculated as a function of the first and second limit cycle periods and compared to a maximum response rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.