公开(公告)号：US11629654B2

公开(公告)日：2023-04-18

申请号：US17651139

申请日：2022-02-15

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

Inventor： Raffaele Ricco ,  Sergio Stucchi ,  Marcello Gargano ,  Onofrio De Michele ,  Chiara Altamura

IPC: F02D13/02 ,  F01L9/20 ,  F01L9/10 ,  F01L1/047 ,  F01L1/14 ,  F02F1/42

Abstract: An engine includes at least one cylinder, a first intake valve and a second intake valve associated with the cylinder, to control a flow of intake air from a first intake duct and a second intake duct, respectively. The two intake ducts communicate with a common intake manifold, so as to receive air at the same pressure. During the intake stage, in each cylinder operating cycle, initially an opening and closing movement of only the first intake valve is activated, while the second intake valve remains closed and, subsequently, an opening and closing movement of only said second intake valve is activated, while the first intake valve remains closed. In this way, the two air flows at the same pressure entering the cylinder give rise to a high turbulent kinetic energy, to the advantage of combustion efficiency and reduction of harmful exhaust emissions.

公开(公告)号：US12247502B2

公开(公告)日：2025-03-11

申请号：US18708390

申请日：2022-11-14

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

Inventor： Raffaele Ricco ,  Sergio Stucchi ,  Marcello Gargano ,  Onofrio De Michele ,  Chiara Altamura

IPC: F01L13/00 ,  F01L1/25 ,  F01L1/26 ,  F01L9/14 ,  F01L9/40 ,  F02D13/02 ,  F01L1/053 ,  F01L1/38 ,  F01L1/46

Abstract: An internal-combustion engine has a plurality of cylinders each with two intake valves driven by respective pumping pistons operatively associated to cams of a camshaft, by respective hydraulic circuits. The hydraulic has its pressure chamber communicating with hydraulic actuators of the two intake valves, so that the two intake valves of each cylinder are controlled, via two different hydraulic circuits, by cams associated to two different cylinders. Each cam is configured to give rise to a cycle of opening and closing of each of the intake valves in an angular range of rotation of the crankshaft less than 180° such that, in each operating cycle of a cylinder, only the first intake valve initially opens and closes while the second intake valve remains closed, and then the second intake valve opens and closes while the first intake valve remains closed.