Method and system for exhaust gas recirculation system diagnostics
US9976521B1 · kind B1 · utility
17Cited by
3References
20Claims
0Family size
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Key dates
| Filing date | Jan 24, 2017 |
| Grant date | May 22, 2018 |
| Priority date | — |
| Expiry date | Jan 24, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Methods and systems are provided for on-board diagnostics of an exhaust gas recirculation system. In one example, a method may include dynamically estimating upper and lower EGR limits based on a commanded EGR flow and estimating a ratio of accumulated difference between a measured EGR flow and one of the upper and lower EGR limits to accumulated commanded EGR flow, over a duration of time. EGR system degradation may be indicated in response to the ratio being higher than a threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.