Patent ID: 9476354
Filing Date: 2016-10-25
CPC Classification: F02B,F02D,F16H

Claim Text:
1. A drive apparatus comprising: a driving unit; a driven unit driven by the driving unit; and a speed reducer disposed between the driving unit and the driven unit and arranged to transmit rotation at a reduced speed from an input shaft connected with the driving unit to an output shaft connected with the driven unit; the speed reducer being a wave motion gearing speed reducer including: the drive apparatus further comprising: wherein the driven unit includes a variable compression ratio mechanism to vary an engine compression ratio of an internal combustion engine in accordance with a rotational position of a control shaft driven by the driving unit, and the controller is configured to set a target compression ratio in accordance with an engine operating condition, and to control a driving condition of the driving unit in accordance with the target compression ratio, and wherein the controller is configured to set the target compression ratio by using a sensed quantity representing a relatively high compression ratio at a time of occurrence of the ratcheting.