Patent ID: 8490387

Claim:
A vehicle engine system including: an internal combustion engine ( 100 ) including an intake manifold ( 22 ) and an exhaust manifold ( 7 ), at least one turbocharger including a turbine housing, said turbine housing having an inlet and an outlet, said inlet in communication with and located downstream of the exhaust stream of said exhaust manifold ( 7 ), at least one aftertreatment device ( 12 , 13 ) located in said exhaust stream downstream of said turbocharger, said aftertreatment device having an inlet and an outlet, bypass piping ( 18 ) connecting exhaust flow upstream of said turbocharger with exhaust flow downstream of said turbocharger and upstream of said aftertreatment device, bypass valving ( 9 , 19 ) for selectively controlling the flow of at least a portion of exhaust gas around said turbine housing, wherein the inner surface area of the bypass piping is 1-25% of the inner surface area of the turbine housing, wherein the length of the bypass piping is 200 cm or less, and wherein the metal weight of the bypass piping is 0.1 to 3% of the weight of the turbine housing.