Diagnosis apparatus and method for an exhaust gas recirculation unit of an internal combustion engine
US5632257A · kind A · utility
19Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1996 |
| Grant date | May 27, 1997 |
| Priority date | — |
| Expiry date | Feb 20, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M26/57
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A exhaust gas recirculation control value is forcibly open/close controlled at the time of steady operation. An estimation of whether or not the actual exhaust gas recirculation quantity has changed with open/close control of the exhaust gas recirculation control valve, is then made based on whether or not a change in combustion pressure accompanying the open/close is a value estimated for the operating conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.