| 摘要 |
In the present invention an internal combustion engine (1) for a vehicle is equipped with an automatic transmission (4) and has a variable compression ratio mechanism for which a target compression ratio (tCR) is determined by referring to a compression ratio map in which target compression ratios are pre-allocated by using the requested load (tT) and the engine rotational frequency (Ne) as parameters. If the automatic transmission is in the reverse position a reverse compression ratio map is selected, if the actual reduction ratio (RR) is small a first compression ratio map is selected, and if the actual reduction ratio (RR) is large a second compression ratio map is selected (S3-S7). In the second compression ratio map, which is selected when the reduction ratio is large, the range of variable control for the compression ratio is narrower than in the first compression ratio map, and the reverse compression ratio map has an even narrower control range. Thus, unintended changes in torque due to changes in the compression ratio when the reduction ratio is large can be suppressed. |
