Abnormality diagnosis apparatus for secondary air supply system of engine
US7797924B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2005 |
| Grant date | Sep 21, 2010 |
| Priority date | — |
| Expiry date | Nov 24, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An abnormality diagnosis apparatus is used for a secondary air supply system for an internal combustion engine. The system includes an air pump for supplying secondary air into an upstream of a catalyst in an exhaust gas passage of the internal combustion engine. A secondary air detecting means detects secondary air information. An abnormality diagnosis means performs an abnormality diagnosis of the secondary air supply system in accordance with the secondary air information detected using the secondary air detecting means. A temperature information determining means performs at least one of detection and estimation of air pump temperature information. A condition setting means performs at least one of setting and compensating a condition for evaluating normality and abnormality of the secondary air supply system in accordance with the air pump temperature information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.