Exhaust gas recirculation control apparatus for an internal combustion engine
US5632258A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1996 |
| Grant date | May 27, 1997 |
| Priority date | — |
| Expiry date | Feb 22, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M26/67
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
According to the present invention, the exhaust gas recirculation control apparatus includes a first switching valve for controlling communication between the positive pressure supplying source and the control valve. The first switching valve opens only when the control means increases and maintains the predetermined pressure supplied to the EGR valve, and under other conditions, the first switching valve closes, so that the positive pressure of the positive pressure supplying source can be utilized only when needed and the positive pressure accumulated inside the positive pressure supplying source can be prevented from leaking from the control valve. When an air compressor, which is mounted for a braking in a vehicle, is commonly used for the EGR valve as the positive pressure supplying source, air pressure of the brake system in the air compressor can be effectively used, a small-sized EGR apparatus being thereby manufactured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.