Nissan Motor Company Limited

Kazuo Muraki

Kakuzou Kaneko

Hiroaki Hoshikawa

Takayoshi Ichihara

Satoru Ookuma

Tomohiro Kawata

Yukinaga Moriguchi

A control method and a control device are provided for an internal combustion engine structured to vary a mechanical compression ratio by varying a range of slide of a piston with respect to a cylinder bore, and structured to control a flow of cooling water in a water jacket formed around the cylinder bore, wherein variation of the mechanical compression ratio causes the piston to slide on a corroded portion formed in the cylinder bore. A control process includes: acquiring a temperature correlating with a cylinder bore wall temperature; and stopping the flow of cooling water in the water jacket, in response to a condition that the acquired temperature is lower than a preset temperature point.

Control method for internal combustion engine and control device for internal combustion engine

A control method and a control device are provided for an internal combustion engine structured to vary a mechanical compression ratio by varying a range of slide of a piston with respect to a cylinder bore. A control process includes: acquiring a temperature correlating with a cylinder bore wall temperature; fixing the mechanical compression ratio to a preset compression ratio point, in response to a condition that the acquired temperature is lower than a preset temperature point; and setting the preset temperature point higher than a point corresponding to a point of the cylinder bore wall temperature at which condensed water occurs in the cylinder bore.

In a flywheel in which narrow portions to be engaged with a coil spring included in the flywheel are formed of recessed portions made by recessing the surface of a flywheel cover, the portions of a sensor plate welded to the front cover, which confront with the recessed portions are made more fragile than adjacent portions of the sensor plate. With this configuration, when the front cover is deformed, stress applied to welded portions adjacent to the recessed portions can be suppressed since the fragile portions are easily deformed. Accordingly, even if the recessed portions are formed to the surface of a flywheel cover, stress can be prevented from being concentrated on the coupling portions of the flywheel cover and the sensor plate.

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Kanagawa, Japan

Kazuo Muraki