Exhaust gas recirculation control system
US4359034A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1981 |
| Grant date | Nov 16, 1982 |
| Priority date | — |
| Expiry date | Mar 13, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2026/009
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An exhaust gas recirculation control system for an internal combustion engine for removing nitrogen oxides (NOx) in exhaust gases comprises a positive pressure delay valve in a negative pressure passage for introducing intake negative pressure in the proximity of a throttle valve of a carburetor into an exhaust gas recirculation control valve to maintain the negative pressure therein during an acceleration, thereby effecting the exhaust gas recirculation even when accelerating to purify the nitrogen oxides in the exhaust gas. The exhaust gas recirculation control system further comprises a positive pressure delay valve in an advance negative pressure passage for introducing the intake negative pressure in the vicinity of the throttle valve of a carburetor into a distributor and synchronized with the above positive pressure delay valve to maintain the distributor advanced, thereby keeping a good combustion of fuel mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.