Patent ID: 8434298

Claim:
A method for injecting ammonia (NH 3 ) into exhaust gas upstream of a catalyst of an aftertreatment system, the method comprising: monitoring whether a regeneration event will occur in less than a predetermined distance to be driven; determining that the regeneration event will occur in less than the predetermined distance to be driven; wherein if the regeneration event is determined to occur in less than the predetermined distance to be driven, the method further comprising: determining whether the exhaust gas temperature is below a predetermined temperature; calculating an amount of NH 3 to fill the catalyst to a selected storage level; increasing the quantity of NH 3 dosed to fill the catalyst to the selected storage level before the regeneration event occurs under the condition that both the regeneration event will occur in less than the predetermined distance and the exhaust gas temperature is below the predetermined temperature, wherein increasing the quantity of NH 3 is determined by at least one of the exhaust gas temperature and an NOx level at a tailpipe; injecting the adjusted quantity of NH 3 into the exhaust gas; and subsequently decreasing or eliminating the quantity of NH 3 injected before the regeneration event occurs under the condition that the exhaust gas temperature exceeds the predetermined temperature.