Compression ratio controlling apparatus and method for spark-ignited internal combustion engine
US6915766B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2003 |
| Grant date | Jul 12, 2005 |
| Priority date | — |
| Expiry date | Jul 29, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P5/1504
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a compression ratio controlling apparatus and method for a spark-ignited internal combustion engine, the variable compression ratio mechanism is controlled by a compression controlling section on the basis of a detected engine speed and engine load in such a manner that the compression ratio is varied toward a target high compression ratio when the engine load falls in a predetermined low load region and toward a target low compression ratio when the engine load falls in a predetermined high load region and a predetermined delay is provided in a variation in the compression ratio toward one of the target high and low compression ratios in accordance with at least one of an engine driving history immediately before a transient state of a change in the engine load occurs and a wall temperature of a combustion chamber of the engine immediately before the transient state thereof occurs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.