Patent ID: 8715580

Claim:
An exhaust gas treatment system for an internal combustion engine, the system comprising: an exhaust conduit positioned downstream of, and configured to receive exhaust gas from, the internal combustion engine; a catalyst device disposed in the exhaust conduit, the catalyst device comprising a rolled metal cylinder of corrugated metal sheet having longitudinally extending passages extending axially from an inlet end to an outlet end; a single, continuous conduit disposed between layers of the rolled metal sheet and configured for circulation of a heat transfer medium through said rolled metal cylinder, the conduit extending axially and radially therethrough; and an energy management system operably coupled to the conduit, the energy management system having a controller programmed to: (a) deliver, through the conduit, heat transfer medium having a temperature higher than an operating temperature of the catalyst device, when the catalyst device is operating below a regulated exhaust constituent conversion temperature; and (b) deliver, through the conduit, heat transfer medium having a temperature lower than the operating temperature of the catalyst device, when the catalyst device is operating above an efficient regulated exhaust constituent conversion temperature.