Particulate matter filter diagnostic techniques based on exhaust gas analysis
US9739761B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2014 |
| Grant date | Aug 22, 2017 |
| Priority date | — |
| Expiry date | May 27, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A diagnostic system and method for diagnosing the performance of a particulate matter (PM) filter of an exhaust system each involve receiving, by a controller from at least one sensor, a gas component measurement of exhaust gas flowing through the exhaust system and the PM filter. The controller calculates a conversion efficiency of the gas component by the PM filter and compares the calculated conversion efficiency to a predetermined conversion efficiency threshold indicative of an expected conversion efficiency of a flow-through catalyst. The controller then determines whether the PM filter is cracked or damaged based on the comparison between the calculated conversion efficiency and the predetermined conversion efficiency threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.