Patent ID: 9476366
Filing Date: 2016-10-25
CPC Classification: F01M,F02B,F02D

Claim Text:
1. A control device for a variable-compression-ratio internal combustion engine, the control device comprising: a variable compression-ratio mechanism including a control shaft and link connected to a crankshaft of the internal combustion engine, the variable compression-ratio mechanism being configured to vary a compression ratio of the internal combustion engine in accordance with a rotational position of the control shaft; an actuator configured to drive the control shaft; a speed reducer provided between the actuator and the control shaft and configured to reduce in speed a rotational power of the actuator and transmit the speed-reduced rotational power to the control shaft; and a speed-reducer accommodating case accommodating the speed reducer, wherein an input shaft of the speed reducer which is connected to the actuator has a shaft center line extending along a horizontal direction, at least a part of the input shaft is kept under a lubricating oil retained in the speed-reducer accommodating case, and the control device further comprises a control section configured to swing the input shaft of the speed reducer by a predetermined swing angle during a predetermined operating state where the compression ratio of the internal combustion engine is maintained constant.