公开(公告)号：US20140338327A1

公开(公告)日：2014-11-20

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 ,  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。

公开(公告)号：US20130276730A1

公开(公告)日：2013-10-24

申请号：US13736617

申请日：2013-01-08

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

Inventor： Fabio BOREAN ,  Sabino LUISI ,  Andrea STROPPIANA

IPC: F01L1/34

CPC classification number: F01L1/34 ,  F01L1/26 ,  F01L1/267 ,  F01L9/021 ,  F01L9/025 ,  F01L13/0015 ,  F01L2001/34446 ,  F01L2013/001 ,  F02D13/0226 ,  F02D13/0261 ,  F02D13/06 ,  F02D17/026 ,  F02D41/0057 ,  F02D41/006 ,  F02D41/0087 ,  F02D2041/0012 ,  F02M26/01 ,  F02M26/42 ,  Y02T10/18 ,  Y02T10/47

Abstract: In an internal-combustion engine provided with a system for variable actuation of the intake valves of the cylinders, some of said cylinders are deactivated in given conditions of operation of the engine by interrupting the supply of fuel. During de-activation, the cycle of opening and closing of the intake valves and exhaust valves of the deactivated cylinders is maintained. The intake valves of each deactivated cylinder are opened when the exhaust valves of the same cylinders are also open. The inactive cylinders are used as reciprocating volumetric pumps for recirculation of exhaust gases from the exhaust manifold of the engine up to the intake manifold. The recirculated gases are cooled in the intake manifold by the air introduced into the latter and can consequently be fed in a larger mass to the active cylinders, which enables a better global efficiency of the engine to be obtained.

Abstract translation: 在设置有用于可变地致动气缸的进气门的系统的内燃机中，在给定的发动机的运行条件下，一些所述气缸通过中断燃料的供应来停用。 在去激活期间，维持停用气缸的进气门和排气门的打开和关闭循环。 当同一气缸的排气阀也打开时，每个停用的气缸的进气门打开。 惰性气瓶用作往复容积泵，用于将废气从发动机的排气歧管再循环到进气歧管。 再循环的气体在进气歧管中被引入后者的空气冷却，因此可以以更大的质量供给到主动气缸，这使得能够获得更好的全球效率的发动机。