Method for diagnosing the exchanger bypass flap in an exhaust gas recirculation circuit
US8342015B2 · kind B2 · utility
1Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2011 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Apr 4, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M26/49
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for diagnosing a failure of an EGR circuit of an engine including an EGR exchanger, an EGR valve, a bypass duct of the EGR exchanger, and a bypass flap arranged upstream from the EGR exchanger and the bypass duct to adjust a proportion of exhaust gases flowing therethrough. The EGR circuit can be activated according to a cooled mode, in which the flap is shut, or according to a bypass mode, in which the flat is open. The method carries out, during a diagnosis phase, two activations of the flap, and measures an average of variations of the EGR gas temperature at an outlet of the EGR exchanger during the diagnosis phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.