公开(公告)号：US12071883B2

公开(公告)日：2024-08-27

申请号：US18253488

申请日：2020-11-23

申请人： PIAGGIO & C. S.P.A

发明人： Adriano Magherini ,  Giovanni Fabris

IPC分类号： F01N3/20 ,  F01N3/28 ,  F01N13/00

CPC分类号： F01N3/20 ,  F01N3/28 ,  F01N13/011

摘要： Exhaust gas system (1) for an internal combustion engine (2) of a saddle-ride type vehicle (20), comprising: —a first conduit portion (3) with one or more primary catalysts (6) arranged inside thereof; —a second conduit portion (4) with one or more secondary catalysts (6′) arranged inside thereof; —a third conduit portion (5) inside of which there is arranged a number of secondary catalysts (6′) which is less than the number of secondary catalysts arranged inside said second conduit portion (4); —at least one outlet (16,17) for discharging exhaust gas to atmosphere; wherein said first conduit portion (3) extends from a first end (11) connectable to an outlet of said internal combustion engine (2) and branches at a branch point (19) into said second and third conduit portions (4,5); wherein said exhaust gas system (1) further comprises at least one valve (7) configured to deviate an exhaust gas flow coming from the engine (2) from the first conduit portion (3) into one or both of said the second and third conduit portions (4,5).