为了快速监测润滑油质量,达到及时更换润滑油的目的,应用介电常数理论分析法,研究了润滑油的铁磨粒含量、水分含量、总酸值与介电常数增量之间的相关性,润滑油中的铁磨粒含量、水分含量、总酸值的增加,导致润滑油介电常数增加.在此基础上开发了润滑油的实时监测设备.试验结果表明:该监测设备能实时监测汽车发动机中润滑油质量,实现了按质更换润滑油；需更换润滑油的介电常数上、下限分别为4.7和4.2.%In order to monitor the quality of lubricating oil quickly so as to replace the oil timely, a theoretical analysis method of dielectric constant was used to study the correlation between the iron abrasive grit content, moisture content and total acid value of the lubricating oil and the dielectric constant increment. The results reflect that the dielectric constant would increase with the iron grits content, moisture content, and total acid value of lubricant oil. On this basis, a lubricant dynamic monitoring device was developed. Experimental results show that the device can monitor the quality of lubricating oil of automotive engines in real time, so that the lubricating oil can be replaced timely according to the oil quality once the dielectric constant value of lubricating oil is out of the range from 4.7 to 4.2.
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