EGR control system for internal combustion engine
US6298835A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2000 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | May 30, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M26/53
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An EGR control system for a direct injection spark ignition engine operated at a plurality of the combustion modes comprising stratified-charge combustion and premix-charge combustion. The system includes a flow rate control valve equipped at the EGR passage to regulate flow rate of the exhaust gas to be recirculated which is operated when the one combustion mode is determined to be changed to another of a plurality of the combustion modes, thereby ensuring an EGR amount that is neither deficient nor excessive for the combustion mode, while preventing misfire from happening and preventing the degradation of drivability, fuel economy and emission performance from occurring. Alternatively, the system includes an actuator for regulating an opening of a throttle valve or a second EGR control valve installed in a branch passage and a passage switching valve for switching the EGR passage and the branch passage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.