电液可变气门系统液压油路瞬时压力的分析

基于某型号船用柴油机电液可变气门系统的仿真模型,研究了回油电磁阀的开启斜率、最大开度限值、开启相位和供油压力对液压油路回油阶段瞬时压力的影响。研究结果表明:急降区的瞬时压力变化率几乎不受供油压力的影响,但随回油电磁阀开启斜率增加而增加,随开启相位的提前和最大开度限值的增加而减小;稳定区的波动方差随供油压力和开启斜率的增加而增加,随开启相位的提前和最大开度限值的增加而减小;自由下降区的瞬时压力变化率几乎不受回油电磁阀开启斜率、最大开度限值、开启相位和供油压力的影响。

Analysis of Instantaneous Pressure of Hydraulic Circuit in Electro-Hydraulic Variable Valve Timing System

Using the simulation model of a type of marine diesel electro-hydraulic variable valve timing system, the influence of the design parameters of oil return solenoid valve, including opening slope, maximum opening limit, opening phase and oil supply pressure on the instantaneous pressure of hydraulic circuit during oil return stage was studied. Results show that the instantaneous pressure change rate in the oil pressure drop zone is almost unaffected by the oil supply pressure, but increases as the solenoid valve opening slope increases, and decreases as the opening phase advances and the maximum opening limit increases. The fluctuation variance in the oil pressure stabilization zone increases with the increase of the oil supply pressure and opening slope, and decreases with the advance of the opening phase and the increase of the maximum opening limit. However, the instantaneous pressure change rate in the free pressure drop zone is almost independent of the solenoid valve opening slope, maximum opening limit, opening phase and oil supply pressure.