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

Abstract

The internal combustion engine (1) can change the mechanical compression ratio by changing the sliding range of the piston (33) relative to the cylinder hole (32), and can cool the water in the water jacket (31a) around the cylinder hole (32). The flow of water is controlled. And, when the cooling water temperature (Tw) in the water jacket (31a) related to the cylinder bore wall temperature is lower than a predetermined temperature (Twth), the flow of the cooling water in the water jacket (31a) is stopped. As a result, the cylinder bore wall temperature can be raised as early as possible, and the problem of condensed water adhering to the inner peripheral surface (32a) of the cylinder bore (32) can be eliminated as soon as possible, so the corrosion of the inner peripheral surface (32a) of the cylinder bore (32) can be delayed. development of.

Description

technical field [0001] The present invention relates to a control method and a control device of an internal combustion engine capable of changing a compression ratio. Background technique [0002] For example, Patent Document 1 discloses an internal combustion engine including: a fuel injection valve for in-cylinder injection that injects fuel into a combustion chamber; a fuel injection valve for port injection that injects fuel into an intake port; and a variable compression mechanism , which can change the mechanical compression ratio. [0003] In this patent document 1, when there is a possibility of corrosion at the front end of the nozzle of the fuel injection valve for in-cylinder injection, the mechanical compression ratio of the internal combustion engine is increased, or the total amount of fuel injection is switched to fuel injection from the port. The port of the injection valve injects, thereby suppressing the generation of corrosion. [0004] However, Patent ...

AI Technical Summary

Problems solved by technology

Moreover, when the mechanical compression ratio is lowered, the corroded part after peeling off of the corroded part may be re-corroded, which may lead to the development of corrosion in the cylinder bore.

[0007] That is, in an internal combustion engine capable of changing the mechanical compression ratio, there is room for further improvement in terms of suppressing the development of corrosion that may occur in the internal combustion engine.

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