Patent ID: 7640731

Claim:
A method for controlling exhaust gas flow through a regenerable exhaust gas treatment device for a Diesel engine having a turbocharger comprising a turbine and a compressor, said method comprising: selectively initially passing exhaust gas produced by said Diesel engine through a first exhaust duct providing a relatively short passageway between an outlet of the turbine and an inlet of the regenerable exhaust gas treatment device and subsequently through at least one of a diesel oxidation catalyst and a diesel particulate filter when it is desired to maintain the internal temperature of the regenerable exhaust gas treatment device, during engine operation, above a predetermined low temperature operating value; and, selectively initially passing exhaust gas produced by said Diesel engine through a second exhaust duct providing a relatively long passageway between the outlet of said turbine and said at least one of a diesel oxidation catalyst and a diesel particulate filter and then subsequently through said regenerable exhaust gas treatment device when it is desired to maintain the internal temperature of the regenerable exhaust gas treatment below a predefined high temperature operating value.