Image processing-based method for determining detergency and dispersibility of engine lubricating oil

Abstract

The invention discloses an image processing-based method for determining detergency and dispersibility of engine lubricating oil. The image processing-based method specifically comprises the following steps: dropping one engine lubricating oil drop on filter paper to obtain an oil spot; acquiring an RGB (Red Green Blue) colorful image f by using a camera and inputting the RGB colorful image to a computer; denoising the image of the oil spot to obtain a denoised RGB colorful image; converting the denoised RGB colorful image to an HSI (Hue Saturation Intensity) color model; segmenting an S component image of the HSI color model to obtain a saturation segmentation chart MS; extracting a saturation difference chart CS; calculating a pixel number NS of the saturation difference chart CS; segmenting an I component image of the HIS color model to obtain an intensity segmentation chart MI of the oil spot; extracting an intensity difference chart CI; calculating a pixel number NI of the intensity difference chart CI; and calculating a detergency and dispersibility coefficient K, described in the specification, of the oil product. According to the image processing-based method, a diffusion zone and an oil ring zone are automatically detected since a settling zone, the diffusion zone and the oil ring zone have different transmissivity to the brightness, and thus the detergency and dispersibility are determined. The image processing-based method is simple in calculation and high in precision and is suitable for being adopted in a real-time system.

Description

technical field [0001] The invention relates to a method for measuring the detergency and dispersibility of lubricating oil, in particular to a method for determining the detergency and dispersibility of engine lubricating oil based on image processing. Background technique [0002] The engine is the heart of the car. There are many metal surfaces that rub against each other in the engine during the running of the car. These parts move fast and the working environment is poor. Engine lubricating oil, known as the "blood" of the car, has the functions of lubricating, cleaning, cooling, sealing, and reducing wear on the engine, which can reduce the wear of engine parts and prolong its service life. With the continuation of the working time of the engine, the oxidation of lubricating oil at high temperature, the wear products of mechanical parts, the mixing of fuel and water during use, these reasons will pollute the lubricating oil, resulting in a decline in oil quality, or ev...

AI Technical Summary

Problems solved by technology

[0004] The traditional manual ruler method has the following problems: first, the measurement process is time-consuming and laborious, and multiple measurements are often required to improve the accuracy; second, the measurement accuracy is not high

Since neither the diffusion ring nor the oil ring is a standard circular shape in practice, and the centroids of the two rings generally do not coincide, errors are likely to exist in the measured diameters of the diffusion ring and oil ring, resulting in low measurement accuracy. Measurement accuracy cannot be guaranteed

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