Study On The On-line Inspection Method Of Engine Lubricant Based On The Technology Of Conductivity

Lubricating oil is the precondition of ensuring the engine to work normally and stably;Its quality will be related to the normal life of engine working.function etc,so timely replacement of the engine oil is very important.Traditional lubricating oil quality inspection method is not suitable to do the online site testing;To provide a timely replacement of oil for engine is greatly difficult.By analyzing the composition of the lubricating oil,the basic performance and the mechanism of metamorphic processes.the study found that the conductivity parameters can be used as the best physical quantity to comprehensive evaluation of the lubricants quality.Therefore, accurate measurement of the electrical conductivity of lubricant is the basic to judge the quality of lubricating oil.Proposes a novel lubricant oil detection theory:By analyzing the characteristics of electromagnetic waves propagating in a lossy medium,the cylindrical coordinate system is deduced under the wave equation in the process of the propagation of electromagnetic waves in the lubricating oil with conductivity,Meanwhile,By Matlab software simulation draw up a relationship between the conductivity values change and the wave equation.Based on the advantages of the induction coil detection method preliminary design the lubricating oil sensor,and through the Matlab software simulation to verify its working principle,it was proved that the basic of electrical conductivity of the lubricating oil sensor method is feasible,and also proved that the evaluation of electrical conductivity of lubricating oil quality are also possible.Finally, analysis of the lubricating oil sensor detects the output signal is weak,easy to be interfered etc. features, Also cleverly using phase-locked amplifier which provides a design guidance to solve these problems,therefore,The preliminary design of lubricating oil sensor monitoring system frame guidance can solve these problems,and describes the functions of its various components.