Patent ID: 8234865

Claim:
A vehicle including a. an engine including a combustion gas intake and exhaust gas outlet, b. a turbocharger including a turbine wheel and a turbine housing having an inlet and an outlet, c. first exhaust piping connecting the engine exhaust to the turbocharger turbine housing inlet, d. an aftertreatment device ( 74 ), e. second exhaust piping ( 32 ) connecting the turbocharger housing outlet to the aftertreatment device, f. a bypass port ( 2 ) fluidly coupled to exhaust gas flow upstream of the turbine wheel, and g. bypass piping ( 68 ) for bypassing the turbocharger, said bypass piping connected to the bypass port and to the second exhaust piping, and h. a valve ( 1 ) associated with said port for blocking and unblocking said bypass port ( 2 ) thereby controlling the flow of exhaust gas to said bypass piping, wherein said valve ( 1 ) is a passive thermally responsive bimetallic valve in the flow of the exhaust gas and responsive to the exhaust gas temperature to unblock said bypass port ( 2 ) below a predetermined temperature and to block said bypass port ( 2 ) above a predetermined temperature.