Patent ID: 7849678

Claim:
A method of operating a power generation system, comprising: operating a diesel engine to produce a lean exhaust comprising NO x ; passing the lean exhaust sequentially through a fuel reformer and then a lean NO x trap that adsorbs a portion of the NO x from the exhaust; from time-to-time, desulfating the lean NO x trap; during the desulfations, pulsing a fuel injection into the exhaust upstream from the fuel reformer whereby the pulsations results in an exhaust-fuel mixture entering the fuel reformer alternating between overall lean and overall rich; beginning the individual fuel pulses according to a first criteria; ending the individual fuel pulses according to a second criteria; obtaining from measurements a temperature of the lean NO x trap over the course of the desulfation; and controlling the temperature of the lean NO x trap by varying the first criteria; wherein the second criteria relates to the fuel reformer approaching a maximum temperature and is independent of the temperature of the lean NO x trap.