Spark ignition type internal combustion engine
US8322315B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2008 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Feb 11, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an internal combustion engine, a variable compression ratio mechanism able to change a mechanical compression ratio and a variable valve timing mechanism able to control the closing timing of an intake valve are provided. At the time of engine low load operation, the mechanical compression is made the maximum so that the expansion ratio becomes 20 or more. Further, at the time of engine low load operation, in part of the operating region or all of the operating region, the actual compression ratio is lowered compared with the time of the engine high load operation and, at the time of engine low load operation, at least when the actual compression ratio is being lowered compared with the time of engine high load operation, the throttle valve is made to close.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.