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.