What does PQ mean in vehicle safety inspection?
1 Answers
PQ in vehicle safety inspection means: 1. PQ is a term used in oil testing. 2. In oil testing, PQ refers to the amount of ferromagnetic particles in the oil, and the PQ value is also known as the mechanical wear index. Relevant information about vehicle safety inspection PQ is as follows: 1. The impact of PQ value on oil performance: If a large PQ value is detected during the inspection, it indicates that the oil contains a high amount of ferromagnetic particles, which further suggests that the mechanism may have severe local wear. 2. Working principle: The tested oil sample is slowly and steadily delivered by a double-tube infusion pump to the tray bracket above the magnet pole through the oil delivery tube. The ferromagnetic wear particles in the oil are adsorbed on the surface center of the tray bracket under the influence of a strong magnetic field. Meanwhile, the oil flowing through the strong magnetic field area is drawn back by the double-tube infusion pump through the return tube. Then, a cleaning solution with strong dissolving power and good volatility (such as tetrachloroethylene) is used to clean the inner wall of the oil delivery tube and the surface center of the tray bracket. After cleaning, the magnetic force acting on the ferromagnetic wear particles remaining on the surface center of the tray bracket is measured by the precision electronic balance through the tray, and the iron content reading (Fe value) of the oil is directly provided.
