VARIABLE COMPRESSION RATIO INTERNAL COMBUSTION ENGINE AND LEARNING METHOD THEREFOR

摘要

A variable compression ratio internal combustion engine is equipped with: a variable compression ratio mechanism (10) capable of changing the engine compression ratio in accordance with the rotational position of a control shaft (14); and a housing (22) accommodating a drive motor (20) that changes/maintains the rotational position of the control shaft (14). When a first movable part (51), which operates in conjunction with the control shaft (14), is in contact with a first stopper (52) and the maximum rotational position of the control shaft (14) in a first rotation direction (R1) is mechanically restricted, a reference position of the control shaft (14) is learned. This first stopper (52) is provided on the outside of the engine main body. Subsequently, when the maximum rotational position of the control shaft in a second rotation direction is mechanically restricted by a second stopper, the maximum conversion angle range of the control shaft is learned.