Vehicle engine with turbine bypass for exhaust treatment device warm-up

摘要

In a preferred embodiment applied to an automotive vehicle engine with an exhaust turbocharger and an exhaust treatment device operative at elevated temperature and located after the turbine in the exhaust system, warm-up of the treatment device is speeded by a bypass system and valve that cuts off exhaust gas flow through the turbine and supplies the engine exhaust directly to the treatment device until its operating temperature is reached, after which the bypass is closed and normal flow through the turbine is provided. Additional features are also described.