A method for comprehensively assessing the quality of lubricating oil

The three major tests for evaluating the quality of lubricants are more critical. As a standard for comprehensively evaluating lubricant quality, countries around the world have basically become consistent, establishing a quality standard consisting of four parts: physical and chemical indicators of lubricants, simulation tests, bench tests, and driving tests. system.

The physical and chemical indicators are the basis. The physical and chemical indicators used to measure the basic performance of lubricants include: kinematic viscosity, low temperature dynamic viscosity, viscosity index, flash point, pour point, sediment, moisture, foam, residual carbon, neutralization value, sulfate ash content And the content of various elements and so on.These physical and chemical indicators are only the basic indicators for measuring lubricating oil. If even the physical and chemical indicators are unqualified, then the following simulation tests and bench tests will not be able to talk about.

The simulation test is the best evaluation method. The first is the simulation test. During the research and development of the oil product, the technicians found that the physical and chemical indicators of the oil product cannot explain the problem or reflect whether the mechanical friction pair is easy to use. The main test consists of the following parts: the coking plate test method and heat pipe test method reflecting the cleanness, dispersion and anti-oxidation of automotive lubricants; the multi-metal oxidation test method and film oxidation test method reflecting the oxidation resistance of automotive lubricants at high temperatures ; Spot test method reflecting the ability of vehicle lubricating oil to disperse sludge; high temperature four-ball machine abrasion test method reflecting the anti-wear level of vehicle lubricating oil. These simulation tests can only simply reflect the working conditions of the engine, and cannot simulate the influence of the engine on the performance of the oil, especially under the complex conditions and working conditions.

In addition, the simulation test method generally adopts comparatively intensified or generalized test conditions. However, the strengthening will be unrealistic, because in the whole process of the engine operation, various comprehensive factors are combined, which affect the oil’s anti-oxidation, cleaning, dispersion and anti-wear capabilities. It is impossible to perform the simulation test of a single performance evaluation. The method is truthfully measured and evaluated, so the various simulation test methods and their evaluation indicators are basically not reflected in the engine oil specifications. The bench test reflects the problem more truthfully. In order to truly reflect the use of oil, and at the same time, it can be recognized by the engine manufacturing department. A bench test to evaluate the performance of lubricating oil has been developed. The bench test is to install a representative engine in a test room, perform an evaluation test for a certain period of time under approved or recognized control conditions, and wait for the engine manufacturer to negotiate and determine various performance indicators before the test. After the rack test is completed, it will be judged; observe whether the testable oil meets the requirements; if the judgment index of the oil product is within the limit range, it can be considered that the oil product has been initially approved and obtained the qualification of the type of oil product. certificate. In principle, it can supply the market. After the above three tests, the quality of the lubricating oil can be fully guaranteed to meet the engine oil requirements of various engine manufacturers.

The bench test is to install a representative engine in a test room, perform an evaluation test for a certain period of time under approved or recognized control conditions, and wait for the engine manufacturer to negotiate and determine various performance indicators before the test. After the rack test is completed, it will be judged; observe whether the testable oil product meets the requirements; if the oil product’s various judgment indicators are within the limit range, it can be considered that the oil product has been initially approved and obtained the qualification of the type of oil product. certificate. In principle, it can supply the market. After the above three tests, the quality of the lubricating oil can be fully guaranteed to meet the engine oil requirements of various engine manufacturers.

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