Patent ID: 7251932

Claim:
An exhaust system having a variable flowpath for exhaust gas produced by a Diesel engine, said engine having a turbocharger comprising a compressor and a turbine, said exhaust system comprising: a three-way engine-out exhaust control valve having an inlet port in direct fluid communication with an exhaust gas discharge port of said turbine, and first and second outlet ports; a regenerable exhaust gas treatment device having an inlet in direct communication with said first outlet port of the three-way engine-out exhaust control valve and a outlet spaced from said inlet; a second exhaust gas treatment device having an inlet in direct communication with said second outlet port of the three-way engine-out exhaust control valve and an outlet spaced from said inlet; a second three-way exhaust control valve having a first inlet port in communication with the outlet of said second exhaust gas treatment device, a second inlet port in communication with the inlet of said regenerable exhaust gas treatment device, and an outlet port in direct fluid communication with an ambient environment; and a third three-way exhaust control valve having an inlet port in direct communication with the outlet of said regenerable exhaust gas treatment device, and first and second outlet ports.