Scoring method and application of varnish film in alcohol fuel engine lubrication system

Abstract

The invention discloses a scoring method and application of an alcohol fuel engine lubricating system, and relates to the technical field of engine lubricating systems. The scoring method includes the following steps: (a) After the bench test of the engine, divide the parts to be scored after dismantling and revealing the paint film; The color coefficient of the value from small to large; (c) compare the color coefficients corresponding to the different color depth gradients on the paint film evaluation scale to score the color depth of the paint film in each area, and the scoring results are calculated according to formula (1) It is obtained that in the component formula to be graded, n is the number of regions. The method of the present invention utilizes the color coefficients corresponding to different color depth gradients to realize the quantitative scoring of the paint film of the alcohol engine lubrication system, so as to reflect the tendency of the machine paint film deposits, and quickly, effectively and truly evaluate the performance of the alcohol engine oil. Provide direction for engine oil improvement.

Description

technical field [0001] The invention relates to the technical field of engine lubricating systems, in particular to a scoring method and application of an alcohol fuel engine lubricating system. Background technique [0002] When the engine is working, the friction surfaces (such as the crankshaft journal and the bearing, the camshaft journal and the bearing, the piston ring and the cylinder wall, the timing gear pair, etc.) make relative motion at a high speed, and the friction between the metal surfaces Not only does it increase the power consumption inside the engine, but the working surfaces of the components wear out rapidly, and the heat generated by friction may also melt the surfaces of some working parts, causing the engine to fail to operate normally. Therefore, in order to ensure the normal operation of the engine, it is necessary to lubricate the surface of the relative moving parts in the engine, that is, to cover a layer of lubricant (oil or grease) on the fric...

AI Technical Summary

Problems solved by technology

[0005] 1. When the methanol engine is cold or the fuel is incompletely burned, methanol will enter the crankcase to dilute the engine oil; in addition, after formic acid and formaldehyde produced by incomplete combustion of methanol enter the engine oil, on the one hand, the acidity of the engine oil will increase, and on the other On the one hand, it degrades the engine oil additives, which will lead to increased wear and corrosion of the engine lubrication system, and the engine oil will produce a paint film on the surface of the methanol engine lubrication system;

[0006] 2. Methanol has a large latent heat of vaporization, which is harder to vaporize than gasoline, and it is easier to escape into the cylinder due to poor vaporization

[0007] At present, the quality of most methanol-specific engine oils on the market is uneven, and there is no effective evaluation method for the quality of methanol engine oil. The evaluation of the paint film in the lubrication system of methanol engines is still blank, which hinders the promotion and application of methanol vehicles.

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