Oxygen concentration sensor abnormality-detecting system for internal combustion engines
US6176080A · kind A · utility
3Cited by
11References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1998 |
| Grant date | Jan 23, 2001 |
| Priority date | — |
| Expiry date | Sep 9, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1454
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An oxygen concentration sensor abnormality-detecting system is provided for an internal combustion engine having first and second oxygen concentration sensors arranged in the exhaust system upstream and downstream of a catalytic converter therein. An ECU determines that the first oxygen concentration sensor is functioning abnormally if an output from the first oxygen concentration sensor does not change when an output from the second oxygen concentration sensor changes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.