公开(公告)号：US20040000276A1

公开(公告)日：2004-01-01

申请号：US10441200

申请日：2003-05-20

Applicant: C.R.F. SOCIETA CONSORTILE PER AZIONI

Inventor： Fabio Borean ,  Mitzi Puccio

IPC: F01L009/02 ,  F01L001/34

CPC classification number: F01L9/02 ,  F01L9/021 ,  F01L9/025 ,  F01L2001/34446

Abstract: In an internal-combustion engine equipped with an electronically controlled hydraulic system for variable actuation of the inlet and/or exhaust valves of the engine, the hydraulic system for actuation of the valves includes, for each engine valve, a solenoid valve for controlling the corresponding hydraulic actuator. Each solenoid valve is controlled according to a pre-set control criterion according to the operating parameters of the engine, said pre-set control criterion corresponding to reference operating conditions of the hydraulic fluid and, in particular, to the value of viscosity of the hydraulic fluid, which varies with temperature. The aforesaid control criterion is, however, adjusted according to an estimated deviation between reference operating conditions of the hydraulic fluid and actual operating conditions of the hydraulic fluid.

Abstract translation: 在配备有用于可变致动发动机的入口和/或排气阀的电子控制液压系统的内燃机中，用于致动阀的液压系统包括用于每个发动机气门的电磁阀，用于控制相应的 液压执行机构。 每个电磁阀根据发动机的运行参数根据预设的控制标准进行控制，所述预设控制标准对应于液压油的参考运行条件，特别是液压油的粘度值 流体随温度变化。 然而，根据液压流体的参考运行条件和液压流体的实际操作条件之间的估计偏差来调整上述控制标准。