Patent ID: 8209963

Claim:
An engine system comprising: an electronically controlled engine including a plurality of electrical actuators in communication with an electronic engine controller; an exhaust aftertreatment system fluidly connected to an exhaust outlet from the electronically controlled engine, and including an electronically controlled reductant delivery system in communication with an electronic aftertreatment controller; the electronic aftertreatment controller being in communication with the electronic engine controller; the electronic engine controller being operable to control the plurality of electrical actuators responsive to an exhaust control signal from the electronic aftertreatment controller; the exhaust control signal is based at least in part on a time rate of change of a temperature of engine exhaust in the exhaust aftertreatment system; wherein the electronic aftertreatment controller includes means for detecting an outgas slip event precondition; the exhaust control signal is responsive to a detection of the outgas slip event precondition; wherein the outgas slip event precondition is a reductant slip event precondition; the exhaust control signal includes a NOx output increase request; wherein the exhaust aftertreatment system includes in series a diesel particulate filter, the electronically controlled reductant delivery system and a NOx reduction catalyst, and further including a temperature sensor adjacent an outlet of the diesel particulate filter, an engine out NOx sensor, and a SCR out NOx sensor; and the means for detecting an outgas slip event precondition includes means for comparing a temperature of engine exhaust upstream from a NOx reduction reaction location in an exhaust system to a predetermined temperature; means for determining whether a time rate of change of a temperature of engine exhaust upstream from a NOx reduction reaction location has exceeded a predetermined temperature change rate for a predetermined duration; means for comparing the time rate of change of a determined reductant density to a predetermined density change rate; and means for determining whether the time rate of change of the determined reductant density is positive and the determined reductant density is greater than a predetermined density.