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|1. (WO2018203360) CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE AND CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE|
|Applicants:||NISSAN MOTOR CO., LTD.
|Title:||CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE AND CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE|
According to the present invention, while the wall temperature of an inner circumferential surface (32a) of a cylinder bore (32) is low, the mechanical compression ratio of an internal combustion engine (1) is fixed. Specifically, when a cooling water temperature (Tw) at a water jacket (31a) that is inside a cylinder block (31), which correlates with a cylinder bore wall temperature, is below a prescribed temperature (Twth), the mechanical compression ratio of the internal combustion engine (1) is fixed at a prescribed compression ratio regardless of operating conditions, which keeps a first piston ring (35) from sliding along a corroded portion of the cylinder bore (32) and makes it possible to delay the progress of corrosion.