Wear particle dynamic concentration modeling and wear state prediction of cylinder liner piston lubrication system in internal combustion engine

Purpose Starting from the wear mechanism, based on the Archard wear model, the wear of the CLPR at different wear stages was modeled. Considering the influence of the physical and chemical indexes of the lubricating oil on the lubrication condition of the CLPR and the influence of the wear particle deposition effect on the change of the dynamic concentration of the wear particle, the dynamic concentration model of the internal combustion engine lubrication system at different wear stages was established. The change trend of the dynamic concentration of the wear particle in the CLPR’s lubrication system was quantified, and the evolution of the wear particle concentration was revealed, which provided support for the condition monitoring and predictive maintenance of the ICE. Design/methodology/approach First, a quantitative characterization and prediction method for wear of cylinder liner piston system (CLPS) based on online wear particle monitoring is proposed. Second, based on the wear mechanism of cylinder liner piston ring, considering the influence of abrasive deposition effect and wear nonstationary characteristics, the dynamic concentration model of cylinder liner piston ring with different wear stages of internal combustion engine lubrication system is established based on Archard wear theory, and the evolution law of abrasive concentration is simulated. Finally, the whole life wear monitoring test was carried out on the self-made test rig. Findings The physical and chemical indexes (viscosity and temperature) of lubricating oil in the CLPS at three working conditions were monitored. The monitoring results showed that the viscosity of lubricating oil decreased by 40.7 %, 45.9 % and 44.5 %, respectively, after 1,200th min monitoring test, and the temperature of lubricating oil increased by 58.2 %, 67.9 % and 64.6 %, respectively. The temperature of lubricating oil was negatively correlated with viscosity. With the increased temperature, the viscosity of lubricating oil decreased, which aggravated the wear of CLPR. By controlling the temperature of lubricating oil, the influence of temperature on the viscosity reduction of lubricating oil can be slowed down, which was beneficial to reduce the wear of CLPR. Originality/value The wear particle sedimentation coefficient was established, and the dimensionless wear coefficient K was revised. The dynamic concentration model of cylinder liner piston lubrication system in different wear stages is established. The experimental verification was carried out on the self-made test rig. The relationship between wear and temperature, viscosity was analyzed.