FIELD: internal combustion engines.
SUBSTANCE: present invention relates to the equipped with compression ratio control mechanism internal combustion engine. Internal combustion engine (1) with variable compression ratio contains the compression ratio control mechanism (2), in which the internal combustion engine (1) mechanical compression ratio is changed in accordance with the control shaft (18) rotational position, the stopper (50) on the low compression side, stopper (60) on the high compression side, sensor (42) for the actuator (24) drive shaft (22) rotational position determining and the arm (30) pressed into the drive shaft (22). Relative rotation between the arm (30) and the drive shaft (22) occurs, when torque exceeding the upper limit torque is applied. Drive shaft (22) or the control shaft (18) is forcibly moved to the restrictive positions, limited by means of the respective stoppers (50, 60), and then, diagnostics regarding the relative rotation presence or absence is performed on the basis of certain values in the respective restrictive positions.
EFFECT: technical result is increase in the fuel economy and improved diagnostic accuracy.
7 cl, 5 dwg
