Abstract
In this paper, a specific engine is selected to perform a bench test to evaluate the performance of the diesel lubricating oil. The injection time of the original engine is changed , and an appropriate after-injection strategy is selected to achieve accelerated aging of the lubricating oil.In the engine bench test, oil samples are taken at regular intervals to analyze the physical and chemical indicators and tribological characteristics, to determine the regularity of the change of the oil aging degree. At the same time, two different kinds of diesel lubricating oil were used for the test, so as to compare the performance parameters of different kinds of the lubricating oil during the aging process.
Highlights
Introduction of the testA Weichai WP13 engine is used as a testing machine to simulate the running and aging of the lubricating oil in the engine
The engine is operated for a certain period of time with an appropriate after-injection angle, and oil samples are taken per 5 hours for physical and chemical indicators and tribological analysis
This paper uses the delayed fuel injection strategy to accelerate the soot generation, and the after-injection angles are selected as +1°CA,1°CA,3°CA and -5°CA
Summary
A Weichai WP13 engine is used as a testing machine to simulate the running and aging of the lubricating oil in the engine. Because the original machine had a slow soot growth rate when the fuel injection time is the 7°CA BTDC (+7°CA). From 1°CA BTDC (+1°CA), 1°CA ATDC (-1°CA), 3°CA ATDC (-3°CA), 5°CA ATDC (-5°CA), we select an optimal after-injection angle among multiple after-injection injection angles to accelerate the soot generation and simulate the rapid aging process of the engine. This paper selects CJ-4 and CI-4 diesel lubricating oil to carry on the test. The engine is operated for a certain period of time with an appropriate after-injection angle, and oil samples are taken per 5 hours for physical and chemical indicators and tribological analysis. We analyze the impact of accelerated old chemical conditions on the performance of different grades of diesel lubricating oil. Air intake form Number of cylinders Cylinder alignment Emission standards Emission control mode Bore × stroke/mm Total piston displacement/ L
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