Patent ID: 8474243

Claim:
A system, comprising: an internal combustion engine; an exhaust manifold connected with said internal combustion engine for communicating a flow of exhaust gas to an adsorber; an electronic control unit that is configured to execute a reductant calculation module that is configured to calculate a quantity of reductant required to periodically regenerate said adsorber as a function of a total fuel quantity being supplied to said internal combustion engine by a fuel system and an amount of fuel required to achieve a stoichiometric air to fuel ratio at an inlet of said adsorber; wherein: said electronic control unit is configured to calculate said total fuel quantity as a function of a measured exhaust air to fuel ratio as sensed by an oxygen sensor positioned upstream of said flow of exhaust entering said adsorber; and said electronic control unit is configured to, after calculating said quantity of reductant required to regenerate said adsorber, control said internal combustion engine to generate reductant that is supplied to said adsorber to regenerate said adsorber; and said electronic control unit is configured to return to a normal engine operating mode once said calculated quantity of reductant has been supplied to said adsorber and configured to return to said normal engine operating mode if reductant supplied to said adsorber is less than said calculated quantity of reductant and a hydrocarbon slip is detected at an output of said adsorber.