Catalyst condition monitor based on differential area under the oxygen sensors curve algorithm
US7536851B2 · kind B2 · utility
34Cited by
12References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 10, 2005 |
| Grant date | May 26, 2009 |
| Priority date | — |
| Expiry date | Mar 22, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A control system and method of monitoring a condition of a catalyst in a catalytic converter includes commanding a first air/fuel ratio. A first signal is monitored from a first oxygen sensor and a second signal from a second oxygen sensor. A second air/fuel ratio is commanded. A first time is determined based on the first oxygen sensor reaching a first threshold voltage. A second time is determined based on the second oxygen sensor reaching a second threshold voltage. A differential area defined by the first and second signals between the first and second times is calculated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.