Patent ID: 8448425

Claim:
A method for an engine system comprising an internal combustion engine comprising a plurality of cylinders, an exhaust system comprising an exhaust gas treatment device, an air flow control means, and a fuel control means, the method comprising: performing an exhaust gas treatment device regeneration, the regeneration including, controlling, during at least a portion of the exhaust gas treatment device regeneration, the air flow control means and the fuel control means so as to provide a mixture to the exhaust gas treatment device with a lambda value of at least 1.0, where the exhaust gas treatment device regeneration comprises inhibiting combustion in at least one of the plurality of cylinders during a cylinder cycle, and controlling the fuel control means so that fuel flows through the at least one of the plurality of cylinders in which combustion is inhibited during the cylinder cycle, and controlling the air flow control means so that an air flow is maintained through the at least one of the plurality of cylinders in which combustion is inhibited during the cylinder cycle, wherein the admittance of air and fuel into the at least one of the plurality of cylinders is controlled by means of the air flow control means and the fuel control means, wherein combustion is inhibited via inhibiting ignition from an ignition system including a spark plug, wherein the air flow control means and the fuel control means are adjusted in response to a desired temperature distribution in the exhaust gas treatment device, and further comprising adjusting a location of combustion in the exhaust gas treatment device to an upstream location in the exhaust gas treatment device via reducing air flow through the at least one of the plurality of cylinders in which combustion is inhibited.