Patent ID: 7877981

Claim:
A system for operating a turbocharged diesel engine, the system comprising: a first and a second bank of cylinders, each of said first and said second cylinder banks having at least a cylinder; a first exhaust pipe coupled to said first cylinder bank and a second exhaust pipe coupled to said second cylinder bank, said first exhaust pipe coupled to said second exhaust pipe by a connecting pipe; a first turbocharger coupled to said first exhaust pipe and a second turbocharger coupled to said second exhaust pipe; an oxidation catalyst located downstream of said first turbocharger; a particulate filter located downstream of said oxidation catalyst; where exhaust gases flow from said first turbocharger to the oxidation catalyst via the first exhaust pipe and exhaust gases flow from said oxidation catalyst to the particulate filter, and where exhaust gases flow from said second turbocharger to a location downstream of said oxidation catalyst and upstream of said particulate filter via the second exhaust pipe; and a valve located in said second exhaust pipe, said valve determining whether said engine operates with said first turbocharger or with said first and said second turbochargers.