Residual burnt gas scavenging method in a direct-injection supercharged internal-combustion multi-cylinder engine running under partial loads
US8627647B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 14, 2011 |
| Grant date | Jan 14, 2014 |
| Priority date | — |
| Expiry date | Oct 28, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of scavenging the residual burnt gas of a direct-injection supercharged multi-cylinder internal-combustion engine(10), notably of diesel type, running under partial loads, with a piston moving in a reciprocating motion between a top dead center (PMH) and a bottom dead center (PMB) includes a burnt gas scavenging stage that is carried out by a sequence of opening/closing at least one exhaust valve (18) during engine exhaust phase (E) and at least one sequence of opening/closing at least one intake valve (28) during this exhaust valve opening/closing sequence. The method includes, during the scavenging stage, in controlling the closing time of intake valve (28) so as to cause a decrease in exhaust pressure (Pe) in order to achieve a pressure differential between intake pressure (Pa) and exhaust pressure (Pe) favorable to intake pressure (Pa).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.