Sensor calibration for catalyst deterioration detection
US5877413A · kind A · utility
34Cited by
14References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 28, 1998 |
| Grant date | Mar 2, 1999 |
| Priority date | — |
| Expiry date | May 28, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A catalyst system employed in the exhaust stream of an internal combustion engine (10) wherein the catalyst deterioration is monitored by an engine controller (26) connected to a first oxygen sensor (22) mounted upstream of a catalyst (18) and a second oxygen sensor (24) mounted downstream. After a cold start of the engine (10) a calibration of the first and second sensors is conducted, to assure accuracy between the two sensors and determine if one of the sensors has failed, and also a light-off time for the catalyst (18) is determined as one way to measure the deterioration of the catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.