公开(公告)号：US09200548B2

公开(公告)日：2015-12-01

申请号：US14201223

申请日：2014-03-07

Applicant: C.R.F. Societa Consortile per Azioni

Inventor： Fabio Borean ,  Andrea Stroppiana ,  Sabino Luisi ,  Francesco Vattaneo

IPC: F01L13/00 ,  F01L9/02 ,  F02D13/02 ,  F02D15/04 ,  F02D43/00

CPC classification number: F01L13/0015 ,  F01L9/025 ,  F01L2013/0089 ,  F02D13/0226 ,  F02D15/04 ,  F02D43/00 ,  Y02T10/18

Abstract: A spark-ignition supercharged internal-combustion gasoline engine is equipped with a system for variable actuation of the intake valves including a pressurized fluid chamber set between intake valve and a respective control cam, and an electrically actuated valve, the opening of which vents the pressure chamber so as to cause rapid closing of the valve, as a result of the respective elastic return means, even when the respective cam would tend to keep the valve open. The variable-valve-actuation system is used in combination with control cams of the intake valves shaped in such a way as to generate an intake valve lift profile including a boot portion with substantially constant lift. The boot portion is provided in the final part of the opening cycle of the intake valve, after bottom dead center.

Abstract translation: 火花点火增压内燃汽油发动机配备有用于可变地致动进气门的系统，包括设置在进气门和相应的控制凸轮之间的加压流体室，以及电致动阀，其开口排出压力 因此，即使当各个凸轮倾向于保持阀门打开时，由于各自的弹性回复装置，致使阀门快速关闭。 可变阀致动系统与进气门的控制凸轮组合使用，其形状为形成包括具有基本恒定升程的靴部分的进气门升程曲线。 在下死点之后，在进气门的打开循环的最后部分中设置护罩部分。