pH regulation device for cylinder liner sliding surface of internal combustion engine, cylinder oiling device for internal combustion engine, and internal combustion engine

Abstract

Provided are a pH regulation device for a cylinder liner sliding surface, a cylinder oiling device for an internal combustion engine, and an internal combustion engine, in which the pH value of a cylinder liner sliding surface can be maintained in an appropriate range irrespective of how much sulfur is contained in fuel. The pH regulation device is provided with a pH detection means (14) for detecting the pH value of the cylinder liner sliding surface of the internal combustion engine, a regulatory agent feeding means for feeding in a pH regulatory agent, a regulatory agent supply channel, a regulatory agent supply rate regulation means (11) for regulating the supply rate of the pH regulatory agent, and a control means (20). The control means (20) is provided with a regulatory agent supply rate setting unit (23) for setting the supply rate of the pH regulatory agent on the basis of the detection result of the pH detection means (14) so that the pH value of the sliding surface is kept within an appropriate range, and a regulatory agent regulation means control unit (24) for controlling the operation of the regulatory agent supply rate regulation means (11) so that the pH regulatory agent can be supplied to the sliding surface at the supply rate set by the regulatory agent supply rate setting unit (23).

Description

technical field [0001] The invention relates to a pH adjusting device for a cylinder liner sliding surface of an internal combustion engine, a cylinder oiling device for an internal combustion engine and the internal combustion engine. Background technique [0002] In marine engines, cylinder lubricating oil (hereinafter referred to as cylinder oil) is supplied to a sliding surface of a cylinder liner on which a piston ring slides, thereby lubricating the sliding surface. [0003] In marine engines, heavy oil is generally used as fuel oil. Heavy oil contains acidic substances such as sulfur components, so acid corrosion may occur on the sliding surface of the cylinder liner. In order to prevent this acidic corrosion, in marine engines, a substance having an alkaline component is used in the cylinder oil to neutralize the acidic substance. [0004] However, in marine engines that alternately use heavy oil and fuels other than heavy oil that contain less sulfur (acidic subst...

AI Technical Summary

Problems solved by technology

However, increasing the types of cylinder oils with different TBNs increases the number of tanks, resulting in increased cost and complication of the structure for switching tanks

In addition, even if the types of cylinder oils with different TBNs are increased, TBN cannot be continuously changed, so it is extremely difficult to prepare cylinder oils with optimal TBN regardless of the type of fuel.

[0014] In the internal combustion engine described in Patent Document 2, corrosion of the cylinder liner is prevented by adjusting the supply amount of the lubricant supplied to the cylinder, but the adjustment range of the lubricant supply amount is limited.

That is, if the amount of lubrication is too small, the lubricity of the sliding surface of the cylinder liner cannot be ensured, and if the amount of lubrication is too large, a large amount of lubricating oil will be pumped up into the combustion chamber to adversely affect the performance of the internal combustion engine.

Therefore, the internal combustion engine cannot cope with fuels with such a sulfur content that it exceeds the possible adjustment range of the lubrication quantity

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