How to detect the amount of diesel mixed in engine oil

Abstract

The invention discloses a method for detecting amount of diesel oil mixed in machine oil. The method comprises the following steps: configuring multiple groups of mixed oil samples according to a ratio Xi of different diesel oil contents in the machine oil; measuring the kinematic viscosity Vi of each group of mixed oil samples by utilizing a kinematic viscosity measuring apparatus; performing correlation analysis on two groups of data of the configuration ratio of the mixed oil samples and corresponding kinematic viscosities according to a statistical function CORREL to obtain a correlation equation Vi=KXi+N serving as basic data for saving according to a SLOPE function and an INTERCEPT function; measuring an actual kinematic viscosity value V of the mixed oil to be detected under the same temperature condition by utilizing the kinematic viscosity measuring apparatus when the mixed oil to be detected is specifically detected to obtain the diesel oil content ratio X in the machine oil in the mixed oil to be detected matched with the actual kinematic viscosity value V according to the correlation equation Vi=KXi+N. According to the method, the content of the mixed diesel oil in the machine oil can be detected by utilizing conventional equipment, the analysis method is simple and practical, and the investment cost is low.

Description

technical field [0001] The invention relates to the field of failure analysis of mixed engine oil, in particular to a method for detecting the amount of diesel mixed in engine oil. Background technique [0002] The oil in the diesel engine lubrication system is often contaminated by foreign substances, causing the oil level in the oil tank to rise. The foreign substances mainly include water and antifreeze in the diesel engine's own cooling system, as well as pollution dilution of fuel and diesel. When the mixed engine oil is mixed with foreign substances and causes a fault, it is necessary to analyze the mixed engine oil. At present, in the petroleum testing industry, liquid chromatography + mass spectrometry is generally used for testing, and the equipment used is liquid chromatography-mass spectrometry ( liquidChromatographMassSpectrometer), referred to as LC-MS, is a high-end instrument in the organic analysis market. Liquid chromatography (LC) can effectively separate ...

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Problems solved by technology

[0003] However, the above-mentioned analysis methods are highly specialized and require highly professional analysts to operate. The entire process steps take a lot of time, and at the same time, the investment cost of the instrument is also relatively large.

In addition, there are occasional errors in the analysis of this method, mainly because some molecular segments will be broken and recombined under the thermal action of organic matter separation, resulting in relatively accurate results.

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