Method and system to diagnose exhaust gas sensor deterioration
US8505370B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 22, 2010 |
| Grant date | Aug 13, 2013 |
| Priority date | — |
| Expiry date | Sep 15, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4175
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method and system to diagnose exhaust gas sensor deterioration, an automobile includes an exhaust gas system. The exhaust gas system has a fuel delivery system, an engine, a catalytic converter, an exhaust gas sensor, a processor, and/or a memory. The fuel delivery system supplies fuel which is combined with air to form a mixture combusted by the engine to generate exhaust. The processor controls the air-fuel ratio of the mixture based on the air-fuel ratio data of the exhaust detected by the exhaust gas sensor. The catalytic converter reduces pollutants in the exhaust. The processor analyzes the air-fuel ratio data to determine one or more time constants of a step response for rich to lean fuel operations and/or lean to rich fuel operations. The processor compares the time constants to a predetermined time constant threshold to determine if the exhaust gas sensor has malfunctioned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.