Internal combustion engine controller with exhaust gas purification catalyst and its deterioration monitoring system
US5819530A · kind A · utility
9Cited by
2References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1992 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Nov 18, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A conversion efficiency of a catalyst is determined by a cross correlation function of a cross-correlation between an output of an oxygen sensor at the upstream of the catalyst and an output of an oxygen sensor at the downstream of the catalyst, to thereby monitor deterioration index of the catalyst. Then, an air and fuel ratio is obtained from at least one of the outputs of the two oxygen sensors, to thereby adjust a fuel supply quantity, so that the fuel supply quantity can be controlled even during a period when the catalyst is being analyzed, without deviating the air and fuel ratio from a target air and fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.