Apparatus and method for determining a failure of an EGR apparatus
US5542400A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1995 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Jun 13, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M26/57
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An apparatus for determining a failure of an exhaust gas recirculation (EGR) apparatus includes an electronic control unit. When judging the fulfillment of the failure diagnosis executing condition, the electronic control unit stores the intake pressure detected by a pressure sensor, and then introduces part of the exhaust gas from an engine to an intake passage via an EGR passage to start the EGR for failure diagnosis. Thereafter, the intake pressure is detected again. If a significant change in intake pressure does not occur before and after the execution of the EGR for failure diagnosis, it is judged that the EGR apparatus is faulty. If the failure diagnosis executing condition becomes unfulfilled during the execution of failure diagnosis, the EGR for failure diagnosis is stopped, and the failure diagnosis entailing EGR is prohibited from the time when the EGR for failure diagnosis is stopped until a predetermined period of time has elapsed, by which the deterioration in riding quality and drivability of the vehicle is prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.