Alcohol fuel engine lubrication system film grading method and application

Abstract

The invention discloses an alcohol fuel engine lubrication system film grading method and an application and relates to the technical field of engine lubrication systems. The grading method comprisesthe following steps: (a) performing bench test on the engine, and performing regional division on to-be-graded components of which films are exposed after disassembly; (b) enabling various color depthgradients from a deep color to a light color on a film rating gauge to sequentially correspond to color coefficients from a smaller one to a larger one; and (c) grading the depths of film colors presented in each region by referring to the color coefficients corresponding to different color depth gradients on the film rating gauge, and obtaining the grading result according to a formula (1), wherein the film grade of the graded component is equal to Sigman1(the area proportion of the nth region*the color coefficient of the nth region), wherein n is the number of regions. According to the method disclosed by the invention, quantification grading of the alcohol fuel engine lubrication system film is realized by utilizing the color coefficients corresponding to different color depth gradients, so that the oil film sediment production tendency is reflected, the alcohol oil performance is rapidly, effectively and really evaluated, and a direction is provided for 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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