| 摘要 |
An air breathing, fuel consuming internal combustion engine such as a diesel or homogenous charge compression ignition engine has an air intake and an exhaust for products of combustion. A pair of turbochargers receive the products of combustion in a series relationship and an exhaust aftertreatment device, such as a particulate filter, receive the products of combustion from the downstream turbine. A power turbine receives the output from the exhaust aftertreatment device and an EGR system downstream of and exposed to the output of the power turbine selectively passes a selected portion of the output to a point upstream of the upstream turbocharger compressor. A device adds fuel to the aftertreatment device to regenerate the particulate filter and the power turbine recoups the additional energy. The power turbine may be used to drive accessories or the prime output of the engine. The system may selectively add fuel to the exhaust aftertreatment device to temporarily increase energy driving accessories for the engine or adding to the prime output of the engine. |
