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专利名称：Internal-combustion engine with an
electronically controlled hydraulic systemfor actuation of the valves and means forcompensating changes in the operatingconditions of the hydraulic fluid
发明人：Fabio Borean,Mitzi Puccio申请号：US10441200申请日：20030520
公开号：US20040000276A1公开日：20040101
专利附图：
摘要：In an internal-combustion engine equipped with an electronically controlledhydraulic 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 solenoidvalve for controlling the corresponding hydraulic actuator. Each solenoid valve iscontrolled according to a pre-set control criterion according to the operatingparameters of the engine, said pre-set control criterion corresponding to referenceoperating conditions of the hydraulic fluid and, in particular, to the value of viscosity ofthe hydraulic fluid, which varies with temperature. The aforesaid control criterion is,however, adjusted according to an estimated deviation between reference operatingconditions of the hydraulic fluid and actual operating conditions of the hydraulic fluid.
申请人：C.R.F. SOCIETA CONSORTILE PER AZIONI
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