Analysis of instantaneous pressure in oil return stage of electro-hydraulic variable valve system
1. Fluid and Power Machinery Key Laboratory of Ministry of Education, Xihua University， Chengdu, Sichuan 610039, China; 2. Shanghai Marine Diesel Engine Research Institution, Shanghai 201108, China
Abstract：Based on a certain type of marine diesel electro-hydraulic variable valve system, through the combination of experiment and simulation, the pressure fluctuation evaluation system was established when the simulation results and experimental data were in good agreement. The effects of the opening slope, the maximum opening, the opening phase and the supply pressure of the oil return solenoid valve in plunge interval, stable interval and free drop interval on the characteristic time of instantaneous pressure for the hydraulic oil circuit after solenoid valve were investigated. The results show that the characteristic time of plunge interval is decreased with the increasing of opening slope of oil return solenoid valve and increased with the increasing of the largest opening. The characteristic time of stable interval is increased with the increasing of opening slope of oil return solenoid valve and decreased with the increasing of the largest opening. The effects of the oil return valve open slope and the largest opening on characteristic time of plunge interval and stable interval are greater than those of open phase position and oil-supply pressure. The oil return solenoid valve open slope, the largest opening, the open phase position and the oil-supply pressure have slight effects on the characteristic time of free drop interval.
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2020, Vol. 41 
